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101015-RMG-BD226 Product Handbook-JJ
ECC/226-TICM
Bryan Donkin RMG Gas Controls Limited
LOW GAS PRESSURE REGULATOR RMG-BD226 SERIES
Introduction
The RMG-BD226 series is a range of Low Pressure,
Direct-Acting, diaphragm operated, spring loaded
regulators.
Use with confidence on natural and manufactured
gases of non-aggressive nature, including Nitrogen,
Carbon Dioxide, Propane and Butane etc.
Application:
Designed primarily for control of fuel feeds to
industrial and commercial burners, heater units,
boilers and other items of equipment where an
accurate, safe and reliable controlled pressure is
required.
Features & Benefits
Quick response to rapid load changes
Installation at any angle
Wide operational pressure range
PRODUCT HANDBOOK
Subje
ct to
changes a
nd intr
oductions o
f im
pro
ved d
esig
ns w
ithout notice
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101015-RMG-BD226 Product Handbook-JJ
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INDEX
Page
1 Introduction
2 Index
3 Models
4 / 5 Spring Selection
6 Capacities
7 Dimensions & Weights
8 Spares Kit Selection
9 / 12 Health & Safety Guidance – Pressure Control Equipment
13 Pre-Commissioning Instructions
14 / 16 Installation & Commissioning Instructions
17 Fault Finding
18 / 19 Maintenance Instructions for 1/2”, 3/4” & 1” - RMG-BD226 series Mk.2 regulator
10 / 21 Maintenance Instructions for 1.1/4”, 1.1/2” & 2” - RMG-BD226 series Mk.3 regulator
22 /24 Maintenance Instructions for DN50 - RMG-BD226 series Mk.2 regulator
25 / 27 Maintenance Instructions for DN65 & DN80 - RMG-BD226 series Mk.2 regulator
28 / 30 Maintenance Instructions for DN100 & DN150 - RMG-BD226 series Mk.2 regulator
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101015-RMG-BD226 Product Handbook-JJ
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Service Conditions
Size Connection Type Type OS NUMBER Outlet Pressure Range
1/2” Screwed 226 Mk2 RMG-BD226L1018 3.7 to 75 mbarg
3/4" Screwed 226 Mk2 RMG-BD226L1026 3.7 to 75 mbarg
1” Screwed 226 Mk2 RMG-BD226L1034 3.7 to 75 mbarg
1.1/4” Screwed 226 Mk3 RMG-BD226L1042 3.7 to 80 mbarg
1.1/2” Screwed 226 Mk3 RMG-BD226L1059 3.7 to 80 mbarg
2” Screwed 226 Mk3 RMG-BD226L1067 3.7 to 80 mbarg
DN 50 Flanged 226 Mk2 RMG-BD226L3005 3.7 to 80 mbarg
DN 65 Flanged 226 Mk2 RMG-BD226L3013 3.7 to 80 mbarg
DN 80 Flanged 226 Mk2 RMG-BD226L3021 3.7 to 80 mbarg
DN100 Flanged 226 Mk2 RMG-BD226L3039 7.5 to 150 mbarg
DN150 Flanged 226 Mk2 RMG-BD226L3047 12.5 to 150 mbarg
DN 50 Flanged 226H Mk2 RMG-BD226H3004 70 to 150 mbarg
DN 65 Flanged 226H Mk2 RMG-BD226H3012 70 to 150 mbarg
DN 80 Flanged 226H Mk2 RMG-BD226H3020 70 to 150 mbarg
Temperature Range: -20 to +60 Deg.C
Screwed Connections: ISO 7-1 Rp (other thread connections considered on request)
Flanged Connections: PN16: BS EN 1092-2: 1997
Designed to comply with the requirements of EN88, Class B, Group 2
Approval: Gas Appliance Directive (90/396/EEC)
Optional Extra‟s
Inlet Filter (screwed sizes = push-in type, Flanged sizes = joint type)
Safety Diaphragm (SD)
ECL – External Control Line (impulse)
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101015-RMG-BD226 Product Handbook-JJ
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SPRING SELECTION OVERVIEW
Threaded models (aluminium body)
OS Number (size)
[226 Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L1018 (½”)
RMG-BD226L1026 (¾”)
RMG-BD226L1034 (1”)
50055830-397 Red 3.7 – 7.5
50055830-398 Blue 7.5 – 15
50055830-399 Self 12.5 – 25
50055831-045 Green 24 – 37
50055830-805 Yellow 35 - 75
OS Number (size)
[226 Mk.3] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L1042 (1¼”)
RMG-BD226L1059 (1½”)
50055831-153 White 3.7 – 10
50055831-067 Red 8– 14
50055831-068 Green 12 – 25
50055831-069 Blue 21– 35
50055831-070 Yellow 33- 55
50055831-071 Black 50 - 80
OS Number (size)
[226 Mk.3) Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L1067 (2”)
50055831-154 White 3.7 – 10
50055831-072 Red 8– 14
50055831-073 Green 12 – 25
50055831-074 Blue 21– 35
50055831-075 Yellow 33- 55
50055831-076 Black 50 - 80
Flanged models (aluminium body)
OS Number (size)
[226 Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L3005 (DN50)
50055830-292 Red 3.7 – 7.5
50055830-293 Blue 7.5 – 15
50055830-283 Self 12.5 – 25
50055830-284 Green 23 – 37
50055830-285 Yellow 35 - 80
OS Number (size)
226H – Mk.2 Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226H3004 (DN50)
50055830-772 Brown 70 – 112
50055830-773 Orange 100 - 150
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101015-RMG-BD226 Product Handbook-JJ
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Bryan Donkin RMG Gas Controls Limited
SPRING SELECTION OVERVIEW
OS Number (size)
[226 Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L3013 (DN65)
RMG-BD226L3021 (DN80)
50055830-545 Red 3.7 – 7.5
50055830-547 Blue 7.5 – 15
50055830-548 Self 12.5 – 25
50055830-549 Green 23 – 37
50055830-550 Black 35 – 60
50055830-598 Grey 55 - 80
OS Number (size)
[226H – Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226H3012 (DN65)
RMG-BD226H3020 (DN80)
50055830-774 Brown 70 – 112
50055830-775 Orange 100 - 150
Flanged models (ductile iron body)
OS Number (size)
[226 Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L3039 (DN100)
50055830-409 White/Gold 7.5 – 15
50055830-410 Black/Gold 12.5 – 25
50055830-412 Yellow/Gold 23 – 37
50055830-414 Brown/Gold 35 – 80
50055830-407 Grey/Maroon 70 - 150
OS Number (size)
[226 Mk.2] Spring No. Colour
Outlet Pressure Range
in mBar
RMG-BD226L3047 (DN150)
50055830-419 Lt.Blue/Dk.Green 12.5 – 25
50055830-420 Yellow/Lt.Blue 23 – 37
50055830-430 Lt.Green/Brown 35 – 60
50055830-431 Lt.Green/Grey 55 – 112
50055830-617 Self 100 - 150
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Bryan Donkin RMG Gas Controls Limited
Dimensions & Weights
SIZE Type A B C D E F Wt.
Kg‟s
1/2” SC 226 Mk2 103 35 90 108 80 140 0.68
3/4" SC 226 Mk2 103 35 90 108 80 140 0.66
1” SC 226 Mk2 103 35 90 108 80 140 0.60
1.1/4” SC 226 Mk3 163.5 55 137.5 170 80 210 1.58
1.1/2” SC 226 Mk3 163.5 55 137.5 170 80 210 1.58
2” SC 226 Mk3 210 61.5 172.5 230 90 270 3.17
DN50 FL 226 Mk2 210 58 261 213 110 420 5.0
DN65 FL 226 Mk2 318 102 384 381 240 600 16.4
DN80 FL 226 Mk2 318 102 384 381 240 600 16.4
DN100 FL 226 Mk2 369 134 620 451 310 970 63.5
DN150 FL 226 Mk2 473 194 830 559 435 1270 114.7
SC = Screwed, FL = Flanged connections) All Dimensions in mm
Minimum
Service
Space. „A‟ Screwed
‘A‟ Flanged
B
C
F
Minimum
Service
Space. D dia.
E
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STANDARD SPARES KIT SELECTION
Size Series Conn, OS NUMBER Spares Kit Ref
1/2" 226 Mk.2 SC RMG-BD226L1018 200/WS-001-2
3/4” 226 Mk.2 SC RMG-BD226L1026 200/WS-001-2
1” 226 Mk.2 SC RMG-BD226L1034 200/WS-001-2
1.1/4” 226 Mk3 SC RMG-BD226L1042 201/WS-001
1.1/2” 226 Mk3 SC RMG-BD226L1059 201/WS-001
2” 226 Mk3 SC RMG-BD226L1067 202/WS-001
DN50 226 Mk2 FL RMG-BD226L3005 200/WS-016
DN65 226 Mk2 FL RMG-BD226L3013 200/WS-005
DN80 226 Mk2 FL RMG-BD226L3021 200/WS-005
DN100 226 Mk2 FL RMG-BD226L3039 200/WS-008
DN150 226 Mk2 FL RMG-BD226L3047 200/WS-010
DN50 226H Mk.2 FL RMG-BD226H3004 200/WS-016
DN80 226H Mk.2 FL RMG-BD226H3012 200/WS-006
DN65 226H Mk.2 FL RMG-BD226H3020 200/WS-006
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HEALTH AND SAFETY GUIDANCE – PRESSURE CONTROL EQUIPMENT
GENERAL
Regulators and other pressurised components, which may contain toxic, flammable or otherwise hazardous
media, are potentially dangerous items of equipment if not operated and maintained in the correct manner.
It is imperative that all users of such equipment fully educate themselves as to the potential dangers and satisfy
themselves that those personnel responsible for installing, testing, commissioning, operating and maintaining the
plant are competent to do so.
The instructions provided in this document assume some basic level of competence by user staff.
If there are any doubts or ambiguities concerning correct procedures contact your local supplier who will be
pleased to advise or provide competent service or instructions.
It should be understood that anything which is stated in this document, does not revoke or override instructions
which are issued by any other competent or authorised body and reference should be made to all relevant Codes
of Practice.
The following comments, whilst not exhaustive, provide guidance as to possible sources of danger to health and
safety.
NOISE
Regulators, and other pressure reducing devices can generate high levels of noise which can be injurious to people
exposed to it for long periods of time. Various recommendations and codes of practice are in existence and users
must ensure that adequate precautions are taken to prevent a health hazard to employees or third parties in this
respect.
INSTALLATION
All pressure containing equipment is designed to withstand the mechanical loads, experienced in normal service
i.e. torque and bending moments in addition to internal pressure. However, care should be taken during
installation to ensure the equipment is not subjected to excessive loads, which would overstress the product and
may result in a serious failure when the product is commissioned.
Excessive stresses can be caused by unsupported lengths of pipe work, or misalignment, and therefore
installations should adequately supported and carefully aligned.
All regulators, slam shut valves, relief valves, etc., should be installed with the correct direction of flow.
Pressure sensing lines are important components of any control system and it is essential that they are installed
correctly in accordance with instructions. Failure to do so can result, especially in the case of slam shut valves, in
excessive pressurisation of the downstream system.
Pressure sensing lines must be adequately supported to eliminate vibration which can result in fatigue failure.
They should also be positioned to ensure they cannot be used as foot or hand holds. Pressure sensing lines
should be slightly inclined so that liquids and condensates drain into the main pipe.
Auxiliary systems should not be tampered with or modified without a full knowledge of the operating conditions
and permission from the relevant engineering authority.
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OPERATION
Depending on the mode of operation the internal valves of regulators may be in the open position. Therefore, when
commissioning a regulator, isolation valves should be opened slowly so that the regulator may assume a regulating
position. If the valves are opened rapidly the regulator may not respond sufficiently quickly to prevent over-
pressurisation of the downstream system.
All regulators, etc., should only be fitted with the control or pressure loading spring as specified by the manufacturer.
Fitting an incorrect spring, or operating a spring outside its specified range, could result in the spring becoming 'coil
bound'. This is especially important when operating relief valves or slam shut valves as incorrect springs may prevent
a relief valve from opening or a slam shut valve from closing.
Precautions should be taken to prevent ingress of water through vent and breather holes. Ice on top of a diaphragm
may dangerously effect the operation of a regulator, slam shut valve or other equipment.
MAINTENANCE
WARNING
Before undertaking any maintenance work the system should be isolated and vented down in accordance with
current SAFETY CODES AND HEALTH AND AT SAFETY AT WORKS REGULATIONS
It may be necessary to purge the installation with an inert gas, such as nitrogen.
Special precautions are necessary for gases such as oxygen or chlorine and the user must ensure that adequate
procedures are prepared and implemented.
After venting it is wise to assume that high-pressure gas may be present when removing covers and plugs.
MAINTENANCE
As previously stated Pressure Control Equipment contains gases at pressures, which are sometimes higher than
atmospheric pressure. Before attempting to investigate problems to service or maintain equipment it must be safely
depressurised or pressurised to atmospheric conditions. As the gaseous medium may be flammable, toxic, corrosive
or otherwise hazardous, it may be necessary to purge the installation with an inert gas, such as nitrogen. Special
precautions are necessary for gases such as oxygen or chlorine and the user must ensure that adequate procedures
are prepared and implemented.
It is not sufficient to isolate the equipment as high pressures may be trapped between the isolating valves. Do not
attempt to remove covers, casing, plugs, etc., before the device has been correctly vented. Even then it is wise
to assume that high pressure gas may be present when removing covers and plugs.
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Most pressure control equipment use coil springs as a loading device. It is important to reduce the load on these
springs by winding back the spring adjuster as far as possible. In certain cases residual load will still be present which
may cause the spring housing to jump up when its fasteners are removed.
In some cases heavy residual spring loads are present even when the spring is relaxed to its maximum within the
confines of the spring housing. In such a case special dismantling screws are provided and it is imperative they be
gradually and evenly slackened in turn to allow the spring to fully extend to its free length. Failure to use these
dismantling screws may result in damage or personal injury.
On slam shut valves in general the door may be in the open position and before any maintenance work is carried out
the door should be tripped to its closed position. However on cartridge type slam shut valves it should be noted the unit
is removed from the body with the door in a latched open position and before any maintenance work is carried out the
door should be tripped to its closed position.
Note the coil spring attached to the door is a loading device and care should be taken when tripping unit.
The area around regulators, relief valves, slam shut valves, etc., may require to be subject to monitoring in order to
detect gas leaks, etc., and due consideration must be given to the installation of gas detecting equipment. The use of
naked flames and non-certified electrical or potential spark generating equipment in such environments is
strictly forbidden.
All gas venting points must be piped to a safe location and fitted with an approved flame trap, as must drain lines which
may allow the escape of gas.
Consideration should be given to reduce the possibility of static electricity being produced in clothing, to avoid a source
of ignition.
WARNING
Maximum rated working pressures and temperatures must not be exceeded.
WE REPEAT - IF IN DOUBT ASK - DO NOT TAKE RISKS
Pressurised components, which may contain hazardous media, are potentially dangerous items of equipment if not
operated and maintained in the correct manner.
All users of such equipment must be trained and competent to carry out their work. Instructions assume a level of
competence by user staff.
Attention must be paid to relevant regulatory requirements and Codes of Practice. All necessary notifications should be
made and measures taken for the protection of personnel.
If there are any doubts or ambiguities concerning correct procedures contact your local supplier who will be pleased to
advise or provide competent service or instructions. DO NOT TAKE RISKS
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INSTALLATION
Care should be taken during installation to ensure the equipment is not subjected to excessive loads, which would
over stress the product and may result in a failure when the product is commissioned. To avoid excessive
stresses pipe work should be adequately supported and carefully aligned. Additional equipment must not be
bolted on to the regulator without due attention to the effect of the extra weight on flanges and other loadings.
Check the equipment is suitable for system pressures, it is installed with the correct direction of flow and that gas
velocity limits in the pipe work will not be exceeded.
Use new fasteners, gaskets or other sealing materials.
Check that adequate space is provided for maintenance and removal / replacement of elements.
For best performance install with the diaphragm casing horizontal with the spring housing vertically upwards,
inverted installation will reduce the outlet pressure range, spring horizontal installations are not recommended.
External control line (ECL) type regulators, the impulse connections should be made from 12 mm stainless steel
pipe connected either on the top or side of the outlet pipe (never on the underside). To assist with
commissioning/maintenance impulse connections should be fitted with ancillary isolation valve(s).
To function, the regulator has to ‘breathe’ to atmosphere. Refer to codes of practice for the need to pipe the
breather to a ‘safe’ area, this breather will pass gas if the diaphragm is ruptured, or, in the case of integral relief
functions, when the relief set pressure is exceeded.
Regulators may pass a very small amount of gas when closed therefore to avoid overpressure occurring a
relief valve must be fitted in the downstream pipe upstream of any isolating valve.
All relief valve outlets (gas discharge to atmosphere) must be piped away to a safe area.
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PRE-COMMISSIONING INSTRUCTIONS
GENERAL
The information contained in the following installation and commissioning instructions is intended to provide
guidance additional to any mandatory, International, National, Company or Site Standards, or Codes of Practice or
Operating Procedures, which apply to the item of equipment or installation.
The personnel undertaking the installation and commissioning should be familiar with the applicable Standards and Regulations and have the necessary knowledge to carry out the recommended procedures.
INSTALLATION
Equipment should be installed without distortion of the adjacent pipe work.
Pipe line stresses must not be transmitted to the equipment.
The flow arrow on the body indicates direction of media flow through the equipment.
Measuring and Impulse lines - transmit pressure from the sense point to the diaphragm chamber.
Vent lines - connect the reference side of the diaphragm to atmosphere and will vent the media to atmosphere in the event of a diaphragm failure.
Loading and Unloading lines - transmit pressure from a pilot or similar device to the active side of the regulator diaphragm.
COMMISSIONING
Before commencement of commissioning the appropriate „Purging Procedures‟ and any standing instructions on „Pressurising‟ together with „Health and Safety at Works Act‟ requirements must be adhered to.
The application of pressure together with the opening and closing of valves is an important and integral
part of the commissioning procedure and must be carried out with due care, instructions to “open slowly”
or “open very slowly”, where applied, should be strictly observed.
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INSTALLATION & COMMISSIONING INSTRUCTIONS
SAFETY RECOMMENDATIONS
It is recommended before undertaking any installation or commissioning all operatives are fully conversant with the
Health & Safety and Pre-Commissioning guidance information contained in pages 9 to 13.
Ensure all applicable standards, codes, government regulations are observed and recommendations and
requirements are satisfied.
TYPICAL INSTALLATION
REGULATOR INSTALLATION
1. Clean inlet piping to remove any dirt and debris that could damage the regulator or impair its operation.
During operation, if debris is likely to be present in the system, a filter should be fitted upstream of
regulator.
2. Check the required duty is within the regulator badged operational band.
3. Ensure all packing including thread protectors or/and flange covers are removed. Check for internal or
external damage. Clean out regulator body if necessary.
4. Position regulator so it is accessible for adjustment, ensure adequate space is available on the top and
below for maintenance purposes.
5. Install regulator in a horizontal pipe with spring case uppermost and allow for at least 5 pipe diameters (of
expanded size if applicable) of straight outlet for optimum performance.
6. Check regulator flow arrow is in the correct direction. Use pipe sealant on male threads only. On flanged
installations use gaskets. Tighten flange bolts equally and diametrically opposite until all firmly secured.
7. On all well ventilated outdoor installations make sure the vent valve is fitted to prevent water, insects and
debris entering the diaphragm case, as this will interfere with the correct operation of the regulator.
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8. On indoor inadequately ventilated installations fit a remote vent line, which should be as short as possible
with a minimum use of bends and terminate to a safe area. Protect terminal point against entry of water
inspects and debris, but do not impair operation.
9. If the regulator has a connection for an External Control Line (ECL), use 1\2” or 12mm OD Stainless
Steel tubing and valve of the same bore for the line. Site with adequate protection against breakage,
regulator goes wide open if line is broken and align to drain away from regulator and without ‘U’ bends to
avoid moisture pockets. Run the line for a minimum of 5 pipe diameters (of expanded size if applicable)
downstream from the regulator to a straight run of pipe where turbulence is at a minimum. Keep clear of
elbows, valves and other causes of flow disturbance. When making the control connection ensure inside
the pipe is smooth and clean, remove any rough edges, weld build up etc. and locate on the centre line or
above (not the bottom).
10. Purge the installation in accordance with mandatory local regulations. Make sure there are no leaks and
all connections are firm and tight.
TO COMMISSION REGULATOR INITIALLY
11. Remove regulator top cap. Rotate spring adjuster anti clockwise to approximate minimum position.
12. Slowly open external control line valve C (ECL regulators only).
13. Slowly open downstream valve B.
14. Very slowly open upstream Valve A.
REGULATOR ADJUSTMENT
15. As the gas flows through the regulator. Turn spring adjuster clockwise to increase the outlet pressure, to
the required level.
16. Replace top cap and screw well down to prevent debris entering. The absence of top cap may also cause
unstable operation as the diaphragm, thus valve can move too quickly.
To check lock up, close down the demand, ensure the regulator locks up adequately at zero flow, expect no more
than 5 to 15mbar above setting, depending on size.
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TO SHUT DOWN REGULATOR FOR MAINTENANCE
17. Carefully close Valve A, allow inlet pressure to dissipate into outlet and then Valves B and C (ECL
regulators only).
18. Vent installation in a safe manner in accordance with local mandatory regulations and standards.
Proceed in accordance with relevant maintenance instructions
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OPERATION - Fault Finding – Direct Control Regulators
Fault Location Possible Cause Remarks
No outlet Pressure
Control Regulator
Check type of regulator:
ICL – Internal Control Line
ECL – External Control Line
If ECL type, connect Impulse Line
downstream
Installed in pipeline with body arrow
pointing in wrong direction
Install regulator with body arrow
pointing in direction of flow
Regulator internals damaged. Check and replace regulator
internals – if necessary
Closing Pressure is
too high
Valve does not close
Regulator main valve
or middle sealing
diaphragm
Defective diaphragm Fit new Diaphragm - consider
Spares Kit
Valve seat damaged or worn Check Valve/Orifice and Valve Seat
– replace where necessary
Worn or damaged seal(s) Fit new seals
Pulsating/Oscillating
Outlet Pressure
Regulator main valve Regulator Valve operating near
closed position e.g. chattering
Check for correct sizing of
Regulator
Diaphragm assembly Diaphragm acting too fast against
outlet pressure fluctuations
Consider fitting a restrictor/jet in the
atmospheric vent or External
Control Line – to dampen down
Excessive Control
Deviations Pressure sensing point
Incorrect Impulse location in outlet
pipe work
Check for correct positioning of
ECL
If the pipe is expanded ECL must
be fitted into the larger sized pipe.
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MAINTENANCE INSTRUCTIONS FOR:
3\4” and 1” SCREWED – RMG-BD226 SERIES (MK.2) REGULATORS
BEFORE SERVICING REGULATOR
Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in
pages 9 to 12. – IF IN DOUBT ASK
TO PREPARE REGULATOR FOR SERVICING
1. Remove cap (1) and gasket or ‘O’ ring (2).
Rotate spring adjuster (3) anti-clockwise until
free
Lift out spring (4) from spring case (5).
2. Loosen setscrews (7) and remove. Lift away
upper diaphragm\spring case (5).
3. Unscrew bottom plug (22). Remove from
regulator body.
4. Ease away main diaphragm 9 from the lower
diaphragm case\body (21).
5. Insert box spanner through bottom opening
and hold on nut (20) whilst releasing nut (6).
Remove upper diaphragm plate (8), main
diaphragm (9), lower diaphragm plate (10)
and distance piece (11).
6. Remove spindle\valve assembly and washer (15) via the bottom opening.
7. Release setscrews (12). Remove retaining plate (13) and balancing diaphragm (14) from regulator body.
TO SERVICE REGULATOR
8. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale, etc.
9. Look into the regulator body and inspect the valve orifice, especially the radiused seating area, this must be
smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used O grade
– 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.
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10. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and free
from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.
11. Check that the small vent orifice in upper diaphragm\spring case (5) is open and clear.
12. Carefully stretch both diaphragms where they flex on plates (8), (10) & (13) washer, distance piece (11) &
(12) and also on the casings (5) & (21). No hairline cracks are permissible, neither are surface blisters or
crushing at the rim - all warrant diaphragm replacement, remember diaphragm failure means regulator
goes out of control.
On no account apply grease onto any part of the diaphragms.
13. Apply a very small amount of grease (Centaurus No. 3 or equal) on setscrews (12) and bottom plug (22)
also on threads of spindle (11) to help sealing.
14. Examine carefully the valve cover (17). Its surface must be smooth, free from any cutting or abrasion
marks. It should not be twisted and lie firmly on valve washer (18). Replace as routine measure. Firmly
tighten down nut (20).
15. Ensure impulse tube (19) is clear of any obstruction. Check by blowing down body port.
TO RE-ASSEMBLE REGULATOR
16. Replace balancing diaphragm (14) (convolution uppermost), retaining plate (13) (rim cut out to match one
in diaphragm (14). Tighten setscrews (12) evenly and firmly down.
17. Insert valve and spindle (16) assembly with washer (15) in place through the bottom opening into sealing
diaphragm (14).
18. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice. Refit
distance piece (11). Lower diaphragm plate (10), main diaphragm (9)-convolution uppermost and upper
diaphragm plate (8).
19. Hold tight on nut (20) and upper diaphragm plate\main diaphragm (8) & (9) Tighten nut (6) firmly down.
20. Refit upper diaphragm\spring case (5). Evenly tighten setscrews (7) to ensure gas-tight diaphragm seal.
21. Check valve, spindle and diaphragm assembly moves freely. Replace bottom plus (22).
22. Replace spring (4) making sure it rests correctly over nut (6), spring adjuster (3), top cap with gasket or ‘O’
ring (1) & (2)
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MAINTENANCE INSTRUCTIONS FOR:
1.¼”, 1.½” & 2” SCREWED – RMG-BD226 SERIES (MK.3) REGULATORS
BEFORE SERVICING REGULATOR
Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in
pages 9 to 12. – IF IN DOUBT ASK
1. TO PREPARE REGULATOR FOR SERVICING
1.1 Remove cap (9) and ‘O’ ring
(8). Rotate spring adjuster
(11) anti-clockwise until free.
Press cap (11) and turn anti-
clockwise to remove. Lift out
spring (5) from spring
housing (2).
1.2 Loosen screws (42) and
remove. Lift away spring
housing (2) taking care not
to damage safety diaphragm
(36), if fitted.
1.3 Lift out safety diaphragm
assembly (if fitted).
1.4 Remove bottom plug (23)
and ‘O’ ring (22) from
regulator body.
1.5 Easy away main diaphragm
(3) from regulator body.
1.6 Insert Allen Key through
bottom opening and fit into
recess on valve back (21).
Unscrew bolt (7) and remove
together with washer (6).
1.7 Remove main diaphragm plate (4), main diaphragm (3)and distance piece (16) from above and remove
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valve back (21), valve seat (20) and valve plug (18) through bottom opening.
1.8 Remove screws (24) and middle diaphragm (17) from regulator body.
2. TO SERVICE REGULATOR
2.1 Thoroughly clean regulator body, casings, covers, etc., free from rust, dirt, scale, etc.
2.2 Look into regulator body and inspect valve orifice, especially the valve seating area. This must be
smooth and free from dirt and any other deposits. Clean if necessary by lightly rubbing the surface with
fine emery cloth (well used O grade – 220 grit is suitable). On no account bring pressure to bear.
Clean well down afterwards.
2.3 Inspect all other parts of regulator body, casings, covers, etc. Ensure that they are free from rough
edges which would prevent correct sealing of diaphragm ‘O’ rings, etc.
2.4 Remove vent plug (14) and check that the breather passage is free from accumulations of paint and
dirt, etc.
2.5 Ensure impulse tube (19) is clear of any obstruction. Check by blowing down body port.
3. TO REASSEMBLE REGULATOR
The regulator is reassembled in reverse order of that detailed in Section 1 above. However, special care should
be taken of the following points.
3.1 Replace ‘O’ rings (8) and (22) with new items.
3.2 Replace safety diaphragm assembly (if fitted), middle diaphragm, main diaphragm and valve seat.
3.3 When refitting middle diaphragm (17) ensure that slot on outer edge is fitted over peg on body.
3.4 Tighten bolt (7) to a maximum torque of 6Nm.
3.5 When fitting the top casing ensure:
(a) The middle diaphragm is not twisted.
(b) The main diaphragm is not twisted and the sealing bead is fitted in the groove in the body.
(c) The safety diaphragm is not twisted and the sealing bead is fitted in the groove on the top casing.
MAINTENANCE INSTRUCTIONS FOR:
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DN50 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR
BEFORE SERVICING REGULATOR
Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in
pages 9 to 12. – IF IN DOUBT ASK
TO PREPARE REGULATOR FOR SERVICING
1. Remove cap (31) and gasket or ‘O’
ring (32); rotate spring adjuster (33)
anticlockwise until free; lift out thrust
washers (34) and spring from spring
case (35).
2. Loosen setscrews (20) and remove;
lift away upper diaphragm/spring
case (35).
3. Unscrew bottom plug (25); remove
from regulator body.
4. Ease away main diaphragm (12) from
the lower diaphragm case/body.
5. Insert box spanner through bottom
opening and hold tight on nut (9)
whilst releasing the other nut (9)
(screwed onto the spring retainer).
Remove spring retainer (10), main
diaphragm (12), distance piece (38),
(flanged models only), travel stop (13).
6. Remove spindle and valve assembly
via the bottom opening.
7. Release setscrews (21); remove
washer (22) – [if fitted], balancing
diaphragm (14) from regulator body.
TO SERVICE REGULATOR
*Note: The Diagram illustrates our DN50 Series 226 HP Regulator
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8. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale etc.
9. Look into the regulator body and inspect the valve orifice, especially the radiused seating area this must
be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used ‘O’
grade – 220 grit is suitable). On no account bring pressure to bear; clean well down afterwards.
10. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and free
from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.
11. Check vent plug (7); see that breather passage is clear of paint and dirt accumulations; also check that
the small vent orifice in upper diaphragm/spring case (35) is open and clear.
12. Apply a very small amount of grease (Centaurus No. 3 or equal) on setscrews (21) and bottom plug (25)
to help sealing.
13. Make sure the guide pin (fitted only on flanged regulators with 0.5 bar inlet pressure rating) can move
freely inside nut (9).
14. Carefully stretch both diaphragms where they flex on their integral plates and also on the casings, no
hairline cracks are permissible, neither are surface blisters or crushing at the rim; all warrant diaphragm
replacement – remember diaphragm failure means regulator goes out of control.
When renewing balancing diaphragm (14) apply a smear of grease (Centaurus No. 3 or equal) just
around the impulse hole and within the sealing bead to help tightness.
On no account apply compound onto diaphragm rims.
15. Examine carefully the valve cover (16), its surface must be smooth, free from any cutting or abrasion
marks; it should not be twisted and lie firmly on valve washer (17); replace as routine measure; firmly
tighten down nut (9).
16, Ensure impulse tube (24) is clear of any obstruction, check by blowing down body port (RMG-BD226
series-ECL regulators, excepted, impulse pipe replaced by plug).
TO ASSEMBLE REGULATOR
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17. Replace balancing diaphragm (14) [convolution uppermost]; washer (22) [if fitted], or nearest setscrew to
impulse tube (24); tighten setscrews (21) firmly down.
18. Insert valve and spindle (15) assembly through the bottom opening into sealing diaphragm (14).
19. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice.; refit
travel stop (13), distance piece (38), (flanged models only) main diaphragm (12) (convolution uppermost)
and spring retainer (10).
20. Hold tight on nut 9 and main diaphragm (12). Tighten nut (9) firmly down.
21. Refit upper diaphragm/spring case (35), evenly tighten setscrews (20) to ensure gas tight diaphragm seal.
22. Replace bottom plug (25); check valve, spindle and diaphragm assembly moves freely on the guide pin (if
fitted).
23. Replace the spring, making sure it rests correctly over spring retainer (10), thrust washers (34), spring
adjuster (33), top cap with gasket or ‘O’ ring (31) and (32).
MAINTENANCE INSTRUCTIONS FOR:
DN65 and DN80 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR
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BEFORE SERVICING REGULATOR
Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in
pages 9 to 12. – IF IN DOUBT ASK
TO PREPARE REGULATOR FOR SERVICING
1. Disconnect the remote vent
line/back loading line/external
control line (if fitted).
2. Remove cap (20) and gasket or ‘O’
ring (22); rotate spring adjuster (23)
anticlockwise until free; lift out thrust
washers (15) and spring (14) from
spring case (25).
3. Loosen setscrews (4) and remove;
lift away spring case (25) and
gasket (12) - if fitted.
4. Mark the position of bottom cover
(1) relative to valve body (40) and
then hold firmly whilst releasing nuts
(46). Gently lower cover and gasket
(2) from regulator body (40).
5. Remove setscrews (10), gently pull
away upper diaphragm case (28).
Ease away main diaphragm (29)
from lower diaphragm case (30).
6. Insert box spanner through bottom
opening and hold tight on guide
bush (38) whilst releasing nut (13).
Remove spring retainer (26), upper
main diaphragm plate (11), main
diaphragm (29), lower main
diaphragm plate (31), distance
piece (9) and upper sealing
diaphragm plate (33).
7. Remove spindle and valve assembly with lower sealing diaphragm plate (5) and washer (37) via the
bottom opening.
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8. Release nuts (46), remove lower diaphragm case (30), sealing diaphragm (6) and gasket (2) from
regulator body.
TO SERVICE REGULATOR
9. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale, etc.
10. Look into the regulator body and inspect the valve orifice, especially the tapered seating area. This must
be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used ‘O’
grade – 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.
11. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and free
from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.
12. Check vent valve (if fitted). Make sure internal valve plates lay firmly and closely together on the valve
seat. If vent plug fitted, see that breather passage is clear of paint and dirt accumulations.
13. Renew all gaskets. Rub well into both surfaces a very small amount of grease (Centaurus No. 3 or
equal) to help sealing. Also, lightly grease the rim of lower diaphragm case (30) to ensure tightness.
Also renew gasket or ‘O’ ring (22) with a ‘O’ ring in a dry and grease free condition.
14. Make sure guide pin (42) (fitted only on regulators with 0.5 bar inlet pressure rating) can move freely
inside guide bush (42) and that the pin retaining nut is tightened firmly down.
15. Carefully stretch both diaphragms where they flex on the diaphragm plates (11), (31), (33), (5) and
casings (28), (30) and body (40). No hairline cracks are permissible, neither are surface blisters or
crushing at the rim, all warrant diaphragm replacement. Remember diaphragm failure means regulator
goes out of control.
When renewing diaphragms apply a sealing compound (Pasticol X106 or equal) on both sides around the
central hole, say for 1”\25mm dia. On the sealing and 2”\50mm dia on the main diaphragm. Also apply
compound on the diaphragm plates and spring retainer.
On no account apply compound onto diaphragm rims.
16. Examine carefully the valve assembly ‘O’ ring (34), its surface must be smooth, free from any cutting or
abrasion marks. It should not be twisted and lie firmly between valve wing (35) and valve back (36).
Renew in a perfectly dry and grease free condition as a routine measure. Lightly grease (silicone type)
new ‘O’ ring (43) before fitting to help sealing. Firmly tighten down guide bush (38).
17. Ensure impulse tube (55) is clear of any obstruction, check by blowing down body port (RMG-BD226
series-ECL regulators, excepted, impulse pipe replaced by plug).
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18. Check that the small pressure orifice is open and clear. Replace the sealing screw and firmly tighten
down.
19. Check that the remote vent line\back loading line\external control line (if fitted) are secure, clear and free
from dirt and paint accumulations.
TO ASSEMBLE REGULATOR
20. Replace gasket (2) sealing diaphragm (6) (dish towards regulator body) and lower diaphragm case (30).
Tighten nuts (46) firmly down.
21. Insert valve and spindle (8) assembly with washer (37) and lower diaphragm plate (5) in place through
bottom opening into sealing diaphragm (6).
22. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice. Refit
upper diaphragm plate (33), distance piece (9), lower main diaphragm plate (31), main diaphragm (29)
[dish towards regulator body], upper main diaphragm plate (11), spring retainer (26) and nut (13) [leave
loose].
23. Adjust the height of the valve and spindle assembly sufficiently to allow main diaphragm rim to lie flat on
the lower diaphragm casing (30). Turn main diaphragm to match holes in rim with holes in casing.
24. Hold tight on guide bush (38) and main diaphragm (29). Tighten nut (13) firmly down.
25. Refit upper diaphragm case (28), evenly tighten setscrews (10) to ensure gas tight diaphragm seal.
26. Replace gasket (2), bottom cover (1) – [in marked position, tighten nuts (46) firmly down].
27. Lift the diaphragm\valve\spindle assembly to the closed position. Let go and watch movement, this must
be smooth and even to the fully open position (on guide pin (42) - if fitted).
28. Refit gasket (12) - if fitted, spring case (25), setscrews (4), spring (14), making sure it rests correctly over
spring retainer (26), thrust washers (15), spring adjuster (23), top cap with ‘O’ ring (20) and (22).
29. Reconnect the remote vent line\back loading line\external control line (if fitted).
MAINTENANCE INSTRUCTIONS FOR: DN100 and DN150 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR
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BEFORE SERVICING REGULATOR
Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in
pages 9 to 12. – IF IN DOUBT ASK
TO PREPARE REGULATOR FOR SERVICING
1. Remove cap (23), reduce compression of
spring (27) to a minimum by rotating
adjusting spindle (2) anti-clockwise.
2. Hold spring housing (21) firmly down
whilst removing nuts (30). Allow spring
housing to slowly rise [under the action
of spring (2)] away from the upper
diaphragm case (32). Remove the
spring housing and spring at the same
time (if regulator installed with minimum
service space specified) and gasket (31).
3. Hold bottom cover (46) firmly whilst
releasing nuts (30). Gently lower cover
and gasket (8) from regulator body (55).
4. Loosen bolts and nuts (30) & (37) and
remove. Gently lift away upper
diaphragm case, ease away main
diaphragm (36) from lower diaphragm
case (38).
5. Insert box spanner through bottom
opening and hold tight on guide bush
(1)whilst releasing nut (17). Remove
spring retainer (16), upper main
diaphragm plate (34), main diaphragm
(36) lower main diaphragm plate (35)
support bracket (if fitted), distance piece (39) and upper sealing
diaphragm plate (9).
6. Remove spindle and valve assembly with lower sealing diaphragm plate (7) and washer (6) [DN100/4”
regulators only] via the bottom opening.
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7. Release nuts (30). Remove lower diaphragm case (38), sealing diaphragm (10) and gasket (8) from
regulator body.
TO SERVICE REGULATOR
8. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale, etc.
9. Look into the regulator body and inspect the valve orifice, especially the tapered seating area, this must
be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used
‘O’ grade – 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.
10. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and
free from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.
11. Check vent valve and make sure internal valve plates lie firmly and closely together on valve seat. If
vent plug fitted, see that breather passage is clear of paint and dirt accumulation.
12. Renew all gaskets. Rub well into both surfaces a very small amount of grease (Centaurus No. 3 or
equal) to help sealing.
13. Make sure guide pin (47) can move freely inside guide bush (1). Check that the guide pin retaining nut
on the underside of bottom cover (46) is firmly tightened down (latest DN100/4” regulators only).
14. Carefully stretch both diaphragms where they flex on diaphragm plates (34), (35), (9), & (7), casings
(32), (38) and body (55). No hairline cracks are permissible, neither all surface blisters nor crushing at
the rim. All warrant diaphragm replacement, remember diaphragm failure means regulator goes out of
control.
When renewing diaphragms, apply a sealing compound (Plasticol X106 or equal) on both sides around
the central hole, say for 1”\25mm dia on the sealing diaphragm and say for 2”\50mm dia on the main
diaphragm. Also apply compound on the diaphragm plates and spring retainer for a gas tight seal. On
no account apply compound or grease on the diaphragm rims or diaphragm case rims; these must be
left perfectly dry.
15. Examine carefully the valve assembly ‘O’ ring (4), its surface must be smooth, free from any cutting or
abrasion marks. It should not be twisted and lie firmly between the valve plug or valve wing (DN100/4”
regulators manufactured prior to January 1984 only) and the valve back (3). Renew in a perfectly dry
and grease free condition as a routine measure.
Lightly grease (silicone type) new stem ‘O’ ring (2) before fitting to help sealing. Make certain washer
above is in place (DN100/4” regulators only). Firmly tighten down guide bush (1).
16. Ensure impulse tube (50) is clear of any obstruction. Check by blowing down the body port.
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17. Renew ‘O’ ring (25) on adjusting spindle (20) by first releasing spring clip (24) and withdrawing the
spindle from inside of the spring case. Lightly coat the ‘O’ ring with a silicone type grease, before
replacing, to help sealing and free movement of the spindle.
TO ASSEMBLE REGULATOR
18. Replace gasket (8), sealing diaphragm (10) (dish towards regulator body) lower diaphragm case (38),
tighten nuts (30) firmly down.
19. Insert valve and spindle (18) assembly with washer (6) [DN100/4” regulators only) and lower sealing
diaphragm plate (7) in place, through bottom opening into sealing diaphragm (10).
20. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice. Refit
upper sealing diaphragm plate (9), distance piece (39), support bracket (if fitted), lower main diaphragm
plate (35), main diaphragm (36) (dish towards regulator body), upper main diaphragm plate (34), spring
retainer (16) and nut (17) (leave loose).
21. Lower valve and spindle assembly sufficiently to allow main diaphragm rim to lie flat on the lower
diaphragm casing (38). Turn main diaphragm to match holes in rim with holes in casing.
22. Hold tight on the guide bush (1) and main diaphragm (36). Tighten nut (17) firmly down.
23. Carefully fit upper diaphragm case (32). Evenly tighten nut and bolts (30), (37) to ensure gas tight
diaphragm seal.
24. Replace gasket (8), bottom cover (46) and nuts (30).
25. Lift the diaphragm\valve\spindle assembly to the closed position. Let go and watch the movement, this
must be smooth and even to the fully open position on guide pin (47).
26. Replace gasket (31), make certain spring adjuster (26) is in the top position. Insert spring (27) inside
the spring case and lift the two together back on the upper diaphragm case (if regulator installed with
minimum service space specified) making sure the spring rests correctly over spring retainer (16).
27. Push the spring case down and tighten nuts (30) firmly down, replace cap (23).
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