TECHNICAL SPECIFICATIONBW Series Brass Body Normally Open

Product Description

Principle of Operation

Performance

Approvals

Construction

Dimensional Details

How to Order

The BW series of valves are 2 port, 2 position, solenoid pilot operated diaphragm valves. TheBW series uses a floating diaphragm which requires a small pressure drop across the mainvalve orifice to remain in the open position.

Typical ApplicationsThe BW valves are general purpose valves for controlling flow of air, water, light oil andpetroleum products*.

*Hazardous area approvals may apply

FunctionalityThe BW normally open series of valves are solenoid operated. The valve is closed by theapplication of a suitable electric power supply to the solenoid coil. This coil provides magneticflux to the solenoid which causes a plunger (armature) to move towards a matching pole face(iron top) within the solenoid.

The actuated plunger causes a pilot orifice, located in a chamber above the main diaphragm, toseal. The sealing of this pilot orifice creates a closed volume above the diaphragm which isopen to upstream fluid pressure via a small bleed hole in the diaphragm. The net force due tofluid pressure on top of the diaphragm effectively seals the diaphragm against the main valveorifice. When the electrical energy is removed, the plunger is freed from the magnetic flux andmoves back to its open position under the influence of a return spring. The plunger opens thepilot orifice and allows the volume above the diaphragm to be open to the down stream end ofthe valve with a flow capability greater than the inflow capability of the diaphragm bleed orifice.This causes the diaphragm to lift to its open position as the net force holding the diaphragmclosed is exceeded by the net force tending to move the diaphragm to the open position. Fluidmay now flow freely through the valve.

Flow PerformanceSee table below

Pressure Rating20-1000 kPa (3-150 psi)

Temperature RatingAmbient temperature range: -34C to 25C (-29F to 77F), specific approvals may have

different temperature ranges.

Fluid Temperature range: -34C to 82C (-29F to 180F), for standard seal materials.FMK and EPDM may be used to 100C (212F), specificapprovals may have different temperature ranges.

Fluid MediaWater, light oil, air, petroleum products*

*Hazardous area approvals may apply

Power Consumption & Duty CycleSee How To Order guide for coil options. All coils are continuous duty rated.

Unit Weight

Model Pipe size Cv/Kv Orifice Weight Height Width Lengthmm (inches) mm (inches) kg (lbs) mm (inches) mm (inches) mm (inches)

12BW2 15 (1/2) 3.5/3.0 12.7 (0.50) 1.27 (1.76) 109 (4.29) 57 (2.3) 100 (3.93)20BW2 20 (3/4) 7.7/6.6 19.0 (0.75) 1.90 (2.78) 117 (4.60) 70 (2.8) 108 (4.25)25BW3 25 (1) 13.2/11.2 25.4 (1.00) 2.54 (4.23) 126 (4.96) 79 (3.1) 122 (4.8)40BW2 40 (1 1/2) 24.0 (20.6) 38.1 (1.50) 3.81 (6.92) 147 (5.78) 95 (3.8) 152 (6.0)

Approvals Carried

AGA (Australian Gas Association):Not approved for fuel gas applications.

ALPGA (Australian Liquid Petroleum Gas Association):Not approved for LPG applications.

CE:Approval applied for, not applicable to this range of products at this date.

CSA (Canadian Standards Association):General Purpose Electrically Operated Valves to CSA 22.2, report no. LR26709-13, dated11th Jan. 1990

UL (Underwriters Laboratories):Listed General Purpose Valve, file MH9011, sections 2.02, 2.05, 2.12 and File E53107,section 1.03

WaterMark:Licence W172 (WaterMark approved materials available on request)

BodyDR brass forgings. Electroless nickel plating is optional.

Diaphragm & SealsA choice of Nitrile, FMK or EPDM.

Solenoid OperatorStainless steel (300 and 400 series), valves designed for AC operation will contain a coppershading ring.

ScrewsZinc passivated steel.

EnclosureSee How To Order guide for coil enclosure options.

Port SizesSee How To Order guide for coil options. All coils are continuous duty rated.

Electrical ConnectionsSee How To Order guide for coil connection options.

Mounting DetailsValve can be mounted with the ports horizontal or vertical.

The example shows a 12BW2-BNBNT-6143 which may be described in words as:

A 12mm (1/2" ports), B series coil, Pilot operated diaphragm with inline ports, design series 2,normally open, No approvals, Forged brass, Nitrile seals, RC (BSPT) inlet and outlet threads,NEMA 1 enclosure, 240V 50Hz coil.

col 1 col 2 col 3 col 4 col 5 col 6 col 7 col 8 col 9 col 10 col 11 col 12

12 BW 2 - B N B N T - 61 43

Col 1

Nominal Size Description

12 15mm (1/2")20 20mm (3/4")25 25mm (1")40 40mm (1 1/2")

Col 2Valve Series BW

Description B coil, Pilot operated diaphragm with in line ports

Col 3

Design Series Description

2 All models except as shown3 25BW is design series 3

Col 4 and Col 10Dash Delimiter

Col 5

Key Design Feature Description

B AC / DC normally open

H AC / DC normally open with hazardous enclosure

Col 6

Approvals Description

N No approvalA UL and/or CSA1W WaterMark1

Col 7

Construction Description

B Forged brassC Chrome plated brassN Nickel plated brass

Col 8

Seal materials Description

N NitrileE EPDMV FMKR Neoprene1

Col 9

Port threads Description

T RC (BSPT)A NPTP RP (BSPP)1

Col 11

Coil/Enclosure Enclosure Electrical connections Conduit Thd.

61 NEMA 1 Screw terminals M20 x 1.562 NEMA 1 Screw terminals 1/2" NPSC67 NEMA 1 Flying leads M20 x 1.568 NEMA 1 Flying leads 1/2" NPSC63 Open C frame Screw terminals64 Open C frame Flying leads66 Open C frame 2 core cable60 Raintight Standard DIN socket Cable gland6A Raintight Less DIN socket Cable gland6B Hazardous Encl.2 Flying leads M20 x 1.56C Hazardous Encl.3 Flying leads 1/2" NPSC

Col 12

Coil Voltage4 Description

51 220V/50Hz, 240V/60Hz, 8 watts, continuously rated581 110V/50Hz, 120V60Hz, 9 watts, continuously rated43 240V/50Hz, 9 watts, continuously rated27 24V DC, 15 watts, continuously ratedD7 12V DC, 15 watts, continuously rated

NOTES1. Confirm availability when ordering

2. Exd, DIP (T3 AC; T5 DC), IP653. Class I Groups C & D, Class II Groups E, F & G

4. Additional voltages may be available

5. Coil is unreliable at 240V AC 50Hz