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Precision Back Pressure Regulators
Research Series Low fl ow / Laboratory scaleGas, Liquid &
Mixed Phase Service
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Research SeriesLow fl ow / Laboratory scaleGas, Liquid &
Mixed Phase Service
Precision: within 0.5%Pressure: 0.02 to 5000 psigTemperature: to
327C (620F )Flow: 0 to 20,000 ml/min
Chemically Compatibile Materials:
Unique Diaphragm Regulator Technology:Dome-loaded design is 5X
more precise than traditional spring loaded regulators
Elegant friction-less diaphragm is the only moving part
Suitable for ultra-pure and aggressive chemicals
Two modes of operation:
Key Applications: Catalyst research
Reservoir core analysis
1/8 HP1 - SS316LAvailable to 5000 psig
Precision Back Pressure Regulators
ZF1 with HPLC (Valco-Style) fi ttingsSS316L body, SS316L
Diaphragm,
Kalrez FFKM o-ring
In Stock!Most common confi gurations are in stock for shipment
in 2-5 days
e
Material Body Diaphram O-ring
SS316L x x
Hastelloy C x x
Zirconium x
PTFE x x
Polymide x
PEEK x
FKM (Viton) x x
FFKM (Kalrez) x
Manual adjustment by mechanical pilot regulator
Computer automation by electronic pressure regulator
Kalrez and Viton are registered trademarks of DuPont Performance
Elastomers
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The Equilibar back pressure regulator is an exciting
breakthrough in precision pressure control. Designed for critical
and demanding processes, the patented Equilibar o ers unmatched
precision across a wide range of pressures and fl ow rates.
Traditional back pressure regulators use springs to gradually
open up as the overpressure is used to compress the spring.
The Equilibar back pressure regulator uses only a frictionless
fl exible diaphragm to modulate the pressure. It fully opens in
less than 1% overpressure in most applications. Our multiple orifi
ces allow us to control over incredibly wide fl ow rate ratios -
over 1000:1 ratios in most applications - and handle two phase fl
ows.
Equilibar back pressure technology is protected by US and
foreign patents. Learn more about our precision back pressure
technology on our website.
Unmatched Precision...
Sensitivity and Precision - Our Key Performance Advantage
Inlet Outlet
Pilot(Reference)Diaphragm
E/P
Electro-PneumaticRegulator
ManualPressureRegulator
- OR -
2 Set-Point Options
1/4 GS4 SS16 back pressure regulatorwith manual set-point
regulator
How the Equilibar Back Pressure Regulator Works
The Equilibar Precision Back Pressure Regulator works like a fl
uid transistor by forming a unique force balance on a fl exible
diaphragm between three separate pressures.
The fl uid inlet pressure and the downstream outlet pressure
exist on the wetted side of the diaphragm. The pilot set-point
applies pressure on the non-wetted side.
The lower pressure of the outlet tries to hold the diaphragm in
a leak-tight seal with the orifi ces. However, any slight excess
between the fl uid inlet pressure and the pilot set-point pressure
quickly overwhelms these seating forces and pulls the diaphragm
away from the orifi ces.
The pilot set-point pressure acts in a 1:1 ratio to set the
pressure to be controlled on the inlet port. As shown at right,
this pilot pressure can be supplied by either an electro-pneumatic
regulator or a manual regulator.
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Material General Operating Pressures
Polyimide (also PEEK, PVDF, PCTFE) 5 psig to max. body
pressure
SS316, Hastelloy C276 50 psig to max. body pressure
PTFE/Glass, PTFE 0.2 psig to max. body pressure
PolyEthylene 0.02 psig to 20 psig
Research Series Models
Standard Research Models
Model Part #Inlet /Outlet
Port
Reference Port
BodyMaterials Dim A Dim B
Max StdPressure
Max Custom
Pressure
Cv Range(precision)
Available EndFittings
NPT (std) (inch) (psig) Min2 Max Std Available
Low FlowLF1 1/8
1/8 NPT1/4 NPT
(PTFE)
SS316L (std)
Hastelloy CPTFE
2.5 1.3 1000 2000
1E-7 0.07NPT
1/16 HPLC
1/8 W125
Autoclave
BSP, VCO-style, VCR- style,
SAE, 1/8 HPLC
(Valco Style)
LF2 1/4
High FlowHF1 1/8
1E-4 0.6HF2 1/4
High Pressure
HP1 1/8
1/8 NPTSS316L
(std) Hastelloy C
2.5
1.45 5000 N/A
1E-6 0.07HP2 1/4 2.75
High Pressure &
Flow
HPF1 1/8 2.51E-4 0.5
HPF2 1/4 2.75
For gas, liquid and mixed phase processesRugged Bar Stock
DesignUltra Low Pressure and Flow RangesHigh Precision
Available Diaphragms
Wetted components: Body, diaphragm, o-ring 1 - Minimum Cv
dependant on diaphragm and set-point pressure and set-point
pressure
Dimensions and Cv values subject to change
3.00
1.50
2.00
P.21
OutletInlet
1/8" NPT Reference Port(All models)
B
A
NL1 mounting bracket fi ts all Research Series Regulators *Also
fi ts GS2, GS3, NL2, NL3 standard models
Material Notes
Viton Standard, temp. to 200C
FFKM (Kalrez) Chemical compatibility, temp. to 327C
Available O-Rings (wetted)
Model Part #Inlet /Outlet
Port
Reference Port
BodyMaterials Dim A Dim B
Max StdPressure
Max Custom
Pressure
Cv Range(precision)
Available EndFittings
(inch) (psig) Min1 Max Std Available
Ultra Low Flow
ULF1 1/8
1/8
SS316L (std)
Hastelloy CPTFE
2.5
1.45
3000 5000
~1E-7 (@ 100 psig)
0.05
NPT
1/16 HPLC
1/8W125
Autoclave
BSP, VCO-style, VCR- style,
1/8HPLC (Valco Style)
ULF2 1/4 2.75 ~1E-8 (@1000 psig)
Zero Flow ZF1 1/8 2.5 1000 3000
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Selecting the right Series
* Custom Solution Models are not included in the standard
Equilibar patents.
The ZF Series BPR extends Equilibars low fl ow performance down
to e ective zero fl ow while maintaining a very stable inlet
pressure. The patent pending design uses a soft o-ring to improve
fl ow shut-o . This is useful for reservoir core analysis and other
lab reactor applications with microscopic or intermittent fl ow
rates.
The ZF Series is not suitable for all applications and has a
narrower pressure and fl ow operating range. In order to maintain
reasonable elastomeric seal life, fl ow rates less than 2 standard
liter/minute and set-point pressures below 1500 psig are
recommended.
LF Series (Low Flow)The LF Series BPR is capable of low fl ow
operation down to about 10 cc/min of gas. Pressure rating to 1000
psig.
HF Series (High Flow)The HF Series BPR is similar to the LF
Series, but with higher fl ow capacity.
HP Series (High Pressure)The HP Series BPR has the same
performance and design as the LF but with a more robust body rated
to 5000 psig.
The ULF Series BPR functions similar to Equilibars LF and HP
Series. In some applications, however, the ULF is able to extend
low fl ow performance down to 0.01 to 0.1 ml/min (gas). Equilibar
application engineers will provide guidance when the advantages of
the ULF design outweigh any potential disadvantages.
ULF Series (Ultra Low Flow)
ZF Series (Zero Flow Capability)
Stan
dard
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odel
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Cust
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Cust
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Mod
els
Each of these standard Research Series models is based on our
patented Equilibar precision back pressure regulator (BPR)
technology. These models are capable of greater than 1000:1 fl ow
rate turn-down ratios in most applications. They can also be used
with 100:1 turn-down ratio in set-point pressure.
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Pressure Stability That Sets A New Industry Standard...Research
Series StabilityThese charts below represent data of the LF1 BPRs
pressure stability through an amazing 6 orders of fl ow rates and
Cv magnitudes! The inlet pressure of most back pressure regulators
varies signifi cantly with changes in process fl ow.
Gas analysis applications such as Petrochemical and Catalyst
Research can take real advantage of the unmatched low fl ow
capability of these regulators. Equilibar regulators can achieve as
high as 10,000:1 fl ow turn down ratios.
High Pressure StabilityEquilibar regulators are able to handle
the most extreme pressure requirements with our Research Series
regula-tors. The HP1 can reach up to 5,000 psig for high pres-sure
applications. Using PTFE/Glass reinforced compos-ites and Stainless
Steel 316 diaphragms we are able to meet the pressure and low fl ow
requirements of todays most demanding analysis instruments.
0
1000
2000
3000
4000
5000
6000
7000
8000
0
200
400
600
800
1000
1200
1E-9 1E-7 1E-5 1E-3 1E-1
Inle
t Pre
ssur
e, k
pag
Inle
t Pre
ssur
e, p
sig
Cv
High Pressure Performance
Set Point: 1000 psig, 6895 kpag
Set Point: 300 psig, 2068 kpag
4E-6 4E-5 4E-4 4E-3 4E-2 4E-1 4E+0
1
6
60
600
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000 100000
Air Flow, SCFM
Inle
t Pre
ssur
e, k
pag
Inle
t Pre
ssur
e, p
sig
Air Flow, ml/min
Ultra Wide Flow Range PerformanceEB1LF Air Trials
Various Set Points: .04, 0.2, 1, 6, and 30 psig0.06
0.6
6
60
600
0.01
0.1
1
10
100
1E-8 1E-7 1E-6 1E-5 1E-4 1E-3 1E-2 1E-1 1E+0
Inle
t Pre
ssur
e, k
pag
Inle
t Pre
ssur
e, p
si g
Cv
Exponential Cv PerformanceEB1LF Air Trials
Various Set Points: .04, 0.2, 1, 6, and 30 psigVarious Set
Points: .04, 0.2, 1, 6, and 30 psig
High Temperature ApplicationsHigh Temperature Seals: Equilibar
has developed high temperature (to 327C or 620F ) versions of the
Research Series Back Pressure Regulators for use in research
reactors and other high temperature processes. These units use
DuPont Kalrez O-rings to seal metallic diaphragms. The seals are
selected based on your maximum expected temperature, with many
available in stock for quick delivery. Each unit is built to order
to precisely fi t your application.
Remote Set-Point Controller: Equilibar Back Pressure Regulators
are dome loaded with a 1:1 pressure ratio and require a set point
pressure reducing regulator which can be remotely located outside
of the hot zone. The dome loading consumes no fl uid, so that your
temperature control is not infl uenced by fl ow to the reference
side of the diaphragm. The set point controller can be manual or
electro-pneumatic. See pages 8 & 9 for options.
Research Series
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Applications
Closed Loop ControlFuel Cell TestingThe Equilibar back pressure
regulator excels at the de-manding requirements of Fuel Cell test
systems. In fact, several of our products were specifi cally
designed to meet their requirements of 1000:1 fl ow rate and 100:1
pressure turn-down ratios.
The schematic at right shows how a closed loop control system
can be used to provide extremely tight control, even across widely
varying process conditions.
Our Research Series are used for the small scale fuel cell test
systems, while medium and large systems use our GS and NLB Series
respectively.
There are hundreds of potential applications for the unique
capabilities of the Equilibar. The Research Series is specifi cally
designed for a variety of gas, liquid, and mixed phase applications
where precision is a must.
Applications span from ultra low fl ow rates to extreme high
pressures. By using unique combinations of diaphragms and o-ring
materials, Equilibar regulators are able to perform in the harshest
environments that include high temperature and aggressive
chemicals.
Catalyst Research ReactorsMany catalyst research applications
rely on high performance back pressure regulators to maintain
stable pressure at elevated temperatures and down to nano fl ow
rates. Because of the Equilibars unique ability to handle two-phase
fl ow, it is possible to substitute a low pressure liquid/gas
separator for the high-pressure separator.
Reactant #1Set-PointPressure
Two-phaseDome-loaded
Back Pressure Regulator
MFC
MFC
Reactant #2CatalystResearchReactor
PG
Separator
Liquid reactant #3
Sample
MFC
TemperatureControl
ConfiningPressure
Two-phaseDome-loaded
Back Pressure Regulator
Set-PointPressure
LiquidGas
Collector
CO2,gas
Brine
Oil
FM
Reservoir Core AnalysisThere are many types of petroleum
upstream core analy-sis applications that depend on back pressure
regulators to maintain the pressure downstream of the sample. Core
fl ooding (as shown at right), PVT analysis, pyrolysis, slim tube
analysis can all benefi t from the ultra-low flow capability of
Equilibars Research Series. The ZF (Zero Flow) Series in particular
was developed to address the demanding requirements of this
industry.
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Application Supply Pressure Ports
Equilibar Part Number
Outlet Pressure Range
Repeatability & Sensitivity
Suggested Pressure Gauge
High Pressure
High Pressure Regulators
Max 6000 psig
1/4 Inlet
Outlet Gauge
HPR-500-B 0-500 psig
Sensitive through a wide range of
pressures
600p-2.5b-2L
HPR-1500-B 0-1500 psig 1500p-2.5b-2L
HPR-2500-B 0-2500 psig 3000p-2.5b-2L
HPR-4000-B 0-4000 psig 500p-2.5b-2L
HPR-6000-B 0-6000 psig 6000p-2.5b-2L
High Precision
Bellofram Type 10
(2-stage)
Max 50 psig
1/4 Inlet
Outlet Gauge
T10LR-25 0.5 to 25 psig
Highly sensitive and stable
Varies 0.005 psi with 25 psi supply
variation
25p-2.5b-2c
Max 150 psig
T10-25 2 to 25 psig 25p-2.5b-2c
T10-60 2 to 60 psig 60p-2.5b-2c
T10-120 2 to 120 psig 160p-2.5b-2c
Compact Economical
BelloframType 41
(1-stage)
Max 250 psig
1/4Inlet
OutletGauge
T41-2 0-10 psig
Highly sensitive
Varies 0.35 psig with 25 psi supply
variation
5p-2.5b-1c
T41-10 0-10 psig 10p-2.5b-1c
T41-30 0-30 psig 30p-2.5b-1c
T41-60 0-60 psig 60p-2.5b-1c
T41-100 0-100 psig 100p-2.5b-1c
Ultra Low Pressure
LPR2 Ultra Low Pressure
Regulator
5 - 30 psig (Stable
Regulated)
1/4 Inlet
Outlet (No Gauge)
LPR2-B (Bleed)
&LPR2-NB
(Non-Bleed)
.25-7 inWC(0.01 to 0.25 psig) Sensitivity: 0.02
inWC
Stability: 0.06 inWC
0-10 WC0-30 WC1-10 inWC
1-28 inWC
Vacuum
Vacuum Regulators
30hg (Vac)
1/8"Inlet
Outlet (no gauge)
VPR-30 0.4 to 30 inHg
Sensitivity0.1 inHg
20-turn knob
30h-2.5b-2VPR-10 0.4 to 10 inHg
Panel Mount Only
VPR-3 0-3 inHg Consult factory
Manual ControlEquilibar Precision Back Pressure Regulators get
their pilot control signal using a fl uid set-point pressure (also
called reference or pilot pressure) on their top port.
You can supply your own fl uid set point signal or choose one of
the popular pilot set point regulators below.
Set-Point Kits
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Process AutomationAutomating your process pressure is easily
accomplished by using an electronic pressure regulator to provide
the pilot set-point pressure to the Equilibar dome-loaded back
pressure regulator.
Equilibar is proud to represent precision electronic regulators
from Propor-tion-Air. These devices are custom tuned on the bench
to work perfectly with the Equilibar precision back pressure
regulators or vacuum regulators.
Contact Equilibar or visit our website for additional details
about the many possible confi guration of these products.
Set-Point Controllers
Regulator Description Key Features
Low Pressure - Ultra Precision Regulator (150 psi max)
QPV Series
Aluminum IP65 enclosure
Optional digital display
4-20 mA or 0-10 VDC
* Min range: 0-0.3 psig, vacuum * Max range: 0-150 psig *
Available in gauge, absolute, vacuum and vacuum- positive ranges *
Superior proportional valve action * Accuracy: 0.1% - 0.5% FS *
Resolution: 0.005% - 0.2% FS * Tuned ready for set-point service *
Optional DeviceNet / Serial communication * Factory set for your
pressure
Medium Pressure - Precision Regulator (500 psi max)
QB Series
Aluminum IP65 enclosure
Optional digital display
4-20 mA or 0-10 VDC
* Min range: vacuum; 0-1 psig * Max range: , 0 -500 psig *
Available in gauge, absolute, vacuum and vacuum- positive ranges *
0.2 to 0.5% FS accuracy * Tuned ready for set-point service * Good
for most applications * Factory set for your pressure
High Pressure - Precision Regulator (1000 psi max)
GP Series
Aluminum IP65 enclosure
4-20 mA or 0-10
VDC
* Min range: Vacuum or 0-500 * Max range: , 0 -1000 psig *
Available in gauge, absolute, vacuum and vacuum- positive ranges *
0.5% FS accuracy * Factory set for your pressure
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Available Options and Accessories
Equilibar Research Series Back Pressure Regulators are now
available in stackable designs to minimize space requirements in
parallel analysis systems
Equilibar Research Series ULF unit shown with integrated 1000
psi Proportion-Air GP1 electronic pressure regulator. In this
application, the inert process gas was used as the supply source
for the GP1.
Equilibar is expanding to higher pressures. This custom EHP1 is
rated for 7000 psig.
Equilibar Research Series back pressure regulator shown with
integrated HPR 6000 psig manual set-point regulator. Inert gas
bottles are often used as the supply gas for these
applications.
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Other products from Equilibar
GS Series Back Pressure RegulatorsThis series is ideal for gas
and mixed phase applications due to the 2-piece body design.
EVR Series Vacuum RegulatorsThe EVR Series uses the GS Series
BPR, but adds a manual set-point kit to make vacuum control of
processes easy and simple.
NL Series Back Pressure RegulatorsThe NL Series has the same
exact performance as the GS Series BPRs, plus an additional water
hammer suppression feature, making them ideal for most liquid
applications.
Contact our EngineersAt Equilibar, your applications unique
requirements will be carefully addressed by one of our trained
application engineers. Please contact us if you have any questions
or special requirements.
Web: www.equilibar.com
Email: [email protected]
Telephone: (828)650-6590
Fax: (801)504-4439
Address: Equilibar, LLC 320 Rutledge Road Fletcher, NC 28732
Application Engineering . . .How we are di erentUnlike
mass-market regulator distributors, everything about Equilibar is
focused on you, the scientist or engineer with a unique pressure
control challenge.
We assign an Application Engineer to you, typically within
moments of your call. We work with you closely to identify the
optimum model, trim, and diaphragm to best meet your challenge. You
can stay in touch with your Application Engineer by email,
telephone, mobile phone, or fax.
After installation, if there are any unexpected issues, your
Application Engineer is still available to support you with
start-up information or (if needed) expedited replacement
parts.
About EquilibarEquilibar, LLC manufactures and markets our
specialized products worldwide. Equilibar branded products are made
in the USA, and protected by US and foreign patents.
All of our products are assembled, inspected and tested by
trained technicians in Fletcher, NC.
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1111122222222222222222222222 22222 22222 222 Copyright 2013
Equilibar LLC
320 Rutledge Rd. Fletcher, NC 28732Tel: (828)650-6590 Fax:
(801)504-4439www.equilibar.com [email protected]
