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May, 2010 pg. 1
The Ultimate in Precision Pressure Control
Precision Back Pressure Regulators
Unique Diaphragm Regulator Technology:• 5X more Precise than standard Pressure Regulators• Dome loaded: for Manual or Automated control
• Elegant friction-less design• Suitable for ultra-pure, hygienic, and aggressive chemicals
NL Series & NLB Series Liquid, Gas and Mixed Phase Service
Gas and Pressure stability across widely varying flow rates
Pressure• range: 0.1 to 2000 psiStandard Body Materials: SS316, PVC• Diaphragms: PTFE, Viton, Buna, PE, SS316• Sizes 1/8” through 1”•
Dome Loaded DesignMatches your process pressure 1:1 to the pressure • provided on the top reference port
In Line PortingOpposed inlet and outlet ports•
Manual AdjustmentUse manual regulator to provide set-point•
Computer Automated ControlUse electronic pressure regulator to provide set-point•
1/2” EB4NL4 SS316 w/ manual set-point
3/8” EB3NL3 SS316
May, 2010 pg. 2
.
The Equilibar® back pressure regulator is an exciting breakthrough in precision pressure control. Designed for critical and demanding processes, the patented Equilibar® offers unmatched precision across a wide range of pressures and flow rates.
How the Equilibar Back Pressure Regulator Works
The Equilibar® Precision Back Pressure Regulator works like a fluid transistor by forming a unique force balance on an flexible membrane between three separate pressures.
The fluid inlet pressure and the downstream exhaust pressure exist on the wetted side of the membrane, separated by a valve seat. The reference air pressure exists on the non-wetted side.
The lower pressure of the outlet tries to hold the membrane in a leak-tight seal with the valve seat. However, any slight excess between the fluid inlet pressure and the reference pressure quickly over-whelms these seating forces and pulls the mem-brane away from the valve seat.
Traditional backpressure regulators use springs to gradually open up as the overpressure is used to compress the spring.
The Equilibar® pressure regulator uses only a fric-tionless flexible membrane to modulate the pres-sure. It fully opens in less than 1 psi overpressure; less than 0.01 psi in some applications.
Equilibar back pressure technology is protected by US and foreign patents.
Unmatched Precision . . . .
3/8” EB3NL3 Teflon (PTFE)
May, 2010 pg. 3
NL & NLB Series Precision Back Pressure Regulator
.
Dramatic stability improvement
The Equilibar® sets a new industry standard in pres-sure control. This chart shows the superior flow stability of the Equilibar® over the Tescom regulator.
Note: Due to the traditional spring actuated back pressure regulation the Tescom performance shows a significantly higher amount of overpressure than the Equilibar® regulators over varying flow rates. Traditional pressure regulators hold constant pres-sure until you very the flow rate.
Back Pressure Regulator vs. Pressure Reducing Regulator
Pressure Reducing Regulators (PRR’s) are the most common type of regulator. They reduce a higher up-stream pressure into a controlled, lower downstream pressure. A PRR opens to increase downstream pressure and closes to reduce it.
A Back Pressure Regulator (BPR) works in the op-posite way, controlling the upstream pressure. Just like a relief valve, a BPR closes to increase upstream pressure, and opens to reduce it. The Equilibar GS series is a precision Back Pressure Regulator that is dome-loaded. A fluid signal com-mands the regulator to control with a 1:1 ratio. This signal is supplied via a manual or electronic pres-sure device.
Precision over varying flow ranges
The inlet pressure of most back pressure regulators vary significantly with changes in process flow.
The chart at right shows how the Equilibar GS regulator holds a constant process pressure even through widely varying flow rates. The GS regulator can achieve as high as 10000:1 flow turn down ra-tios. This is extremely useful in applications where the flow consumption varies significantly. Pressure is maintained stable even with sudeen spikes or drops in flow.
PRR BPR
0
100
200
300
400
500
0 200 400 600 800
0
10
20
30
40
50
60
70
80
0 5 10 15 20 25 30In
let P
ress
ure,
kpa
g
Air Flow, normal LPM
Inle
t Pre
ssur
e, p
sig
Air Flow, SCFM
Air Performance ComparisonEQUILIBAR® vs. Tescom
Equilibar® 3/8"
Equilibar® 1/4"
Tescom 26-23 High Precision(1/4", 3/8", 1/2")
Set Point 30 psi (206 kPa)
0
5
10
15
20
25
30
35
40
45
0 50 100 150 200 250 300
0
1
2
3
4
5
6
7
0 2 4 6 8 10 12
Inle
t Pre
ssur
e, k
pag
Air Flow, normal LPM
Inle
t Pre
ssur
e, p
si g
Air Flow, SCFM
Low Pressure Air ComparisonEQUILIBAR® vs. Fairchild
EQUILIBAR® 3/8"
Fairchild 30 BP Precision 3/8"
Set Point 3 psi (85 kPa)
0.3 3 30 300
1
10
100
0.1
1
10
100
0.01 0.1 1 10 100
Air Flow, normal LPM
Inle
t Pre
ssur
e, k
pag
Inle
t Pre
ssur
e, p
sig
Air Flow, SCFM
Ultra Wide Flow Range Performance3/8" Equilibar GR w/ VT9 diaphragm
Various Set Points: .25, .5, 1, 2, 5, 10 and 30 psig
May, 2010 pg. 4
Material Pressure Range
PTFE 0.2 psig to max body pressure
PTFE/Glass 5 psig to max. body pressure
PolyEthylene 0.02 psig to 20 psig
Viton (reinforced) 0.5 psig to max body pressure
Buna N (reinforced) 0.5 to max. body pressure
SS316 100 psig to max. body pressure
NL Series Precision Back Pressure RegulatorNL Series Features
Metallic NL Series
Polymeric NL Series
3/8” EB3NL3 SS316
Model Inlet /Outlet Port
Reference Port
Standard BodyMaterials Dim A Dim B Max Std
PressureMax Custom
PressureCv Range
(precision)Available End
Fittings
(inch) (psig) Min1 Max Std Available
EB2NL2 1/4”
1/8”
SS316 (std)
Carbon Steel (Black Oxide)
3.0 1.6 500 2000 1E-3 1.0
NPT
150#Flange
BSPSAE
VCO styleVCR style
EB3NL3 3/8” 3.5 1.7 400 1500 1E-3 1.8
EB4NL4 1/2” 4.5 1.9 400 1500 1E-3 3.0
EB5NL6 3/4” 6.0 2.4 300 1000 1E-2 6.2
EB6NL8 1” 7.0 3.2 300 1000 1E-2 9.9
EB8NL12 1 1/2” 9.0 4.6 200 500 1E-1 14.3
EB10NL16 2” 11.0 5.5 200 500 3E-1 30.2
For liquid, gas & mixed phase processesRugged Bar Stock DesignUnique Chatter Suppresion FeatureHigh Precision
Model Inlet/Outlet Port
Reference Port
Standard BodyMaterials Dim A Dim B Max Pressure
psigCv Range
(precision)Available End
Fittings
(inch) PVC, other PTFE Min1 Max Std Available
EB2NL2 1/4”
1/4”
PVC (std)PTFE
CPVCPVDF Acetal
3.0 1.6 100 50 1E-3 1.0
NPT
BSP
Flange (PVC, CPVC)
EB3NL3 3/8” 3.5 1.7 100 50 1E-3 1.8
EB4NL4 1/2” 4.5 1.9 75 50 1E-3 3.0
EB5NL6 3/4” 6.0 2.4 75 50 1E-2 6.2
EB6NL8 1” 7.0 3.7 75 50 1E-2 9.9
Available Diaphragms
Wetted Components Body & Diaphragm• No wetted o-rings • Chatter Suppression Ability• 1 - Minimum Cv dependant on diaphragm • and set-point pressureDimensions and Cv values subject to change•
A
Reference Port (1/8")
B Outlet Port Inlet Port
May, 2010 pg. 5
Material Pressure Range
PTFE 0.2 psig to max body pressure
PTFE/Glass 5 psig to max. body pressure
PolyEthylene 0.02 psig to 20 psig
Viton (reinforced) 0.5 psig to max body pressure
Buna N (reinforced) 0.5 to max. body pressure
SS316 100 psig to max. body pressure
NLB Series Precision Back Pressure RegulatorNLB Series Features
Metallic NL Series
Polymeric NLB Series
1” EB6NLB8 PVC
Model Inlet /Outlet Port
Reference Port
Standard BodyMaterials Dim A Dim B Max Std
PressureMax Custom
PressureCv Range
(precision)Available End
Fittings
(inch) (psig) Min2 Max Std Available
EB6NLB8 1”
1/8”
SS316 (std)
Carbon Steel (Black Oxide)
6.8 2.1 200 500 1E-2 9.8
NPT Butt WeldFlange
EB8NLB12 1 1/2” 8.8 3.1 400 1500 1E-1 14.3
EB10NLB16 2” 10.8 4.1 400 1500 3E-1 30.2
EB16NLB24 3” 12.7 6.1 300 1000 6E-1 60.0
For liquid, gas & mixed phase processes1
Rugged Bar Stock DesignFeatures External Elbows (Welded)
Model Inlet/Outlet Port
Reference Port
Standard BodyMaterials Dim A Dim B
Max Pres-surepsig
Cv Range(precision)
Available End Fittings
(inch) PVC, other Min2 Max Std Available
EB6NLB8 1”
1/4”
PVC (std)PTFE
CPVCPVDF Acetal
7.0 3.1 75 1E-2 9.9
NPT Socket Weld
EB8NLB12 1 1/2” 9.0 4.3 75 1E-1 14.3
EB10nlb16 2” 11.0 3.0 75 1E-1 30.2
EB10NLB20 2 1/2” 13.0 3.5 75 3E-1 34
Eb16NLB24 3” 17 4.0 75 6E-1 60.0
Available Diaphragms
Wetted Components Body & Diaphragm• No wetted o-rings • Chatter Suppresion Ability• 1 - Contact factory for liquid applications• 2 - Minimum Cv dependant on diaphragm • and set-point pressure and set-point pres-sure
A
B
NPT Inlet NPT Outlet
May, 2010 pg. 6
Applications
.
There are hundreds of potential applications for the unique capabilities of the Equilibar®. The NL and NLB series is specifically designed liquid, gas and mixed phase services.
Applications span from ultra low flow 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.
Precision Control with Closed Loop Control
For most applications, the Equilibar® is precise enough to be used with a simple manual set-point pressure input. However, for some automation appli-cations, it is useful to have closed loop control using an external pressure transmitter. By using an electro-pneumatic regulator with external feedback, it is pos-sible to match the reading of your process pressure transmitter exactly to your desired set-point.
The Equilibar® provides numerous benefits over traditional control valves in these closed-loop appli-cations. Such benefits include extremely wide flow range, ultra fast reaction times, and ease of PID tun-ing.
Equilibar PrecisionBack Pressure Regulator
®
I O
air
Process
PT
Pressure Feedback0-10 VDCor 4-20 mA
Set Point0-10 VDCor 4-20 mA
E/P
Electro-PneumaticRegulator w/External Feedback
PIDController
Liquid / Pump Pressure Control
The Equilibar® can precisely control the discharge pressure of virtually any type of pump by simply plac-ing the regulator in the return line back to the supply reservoir.
Use an ectro-pneumatic regulator for the set-point signal for computer automation of your system pres-sure. Or use a manual regulator, as shown to the left, for simple manual control of your system pressure.
Pulse Generating Applications
The Equilibar’s® unique frictionless direct sealing dia-phragm design gives it unprecedented capabilities to generate precision pulse waveforms with millisecond timing.
Your PLC or computer control system can now create realtime pressure waveforms using any fluid and any pump.
The system works by using an Electro-Pneumatic Regulator to command the pulse wave in air. The Equilibar is able to mirror that same pressure wave-form into your process liquid.
®
®
IOR
May, 2010 pg. 7
Applications (continued)
Vacuum Control
The Equilibar® can control in the vacuum range just as easily in the positive pressure range.
The reference pressure can be supplied by a sensitive manual vacuum regulator, or by an electro-pneumatic regulator (as shown).
See the Equilibar Vacuum Regulator brochure for ad-ditional details. Equilibar Precision
Vacuum Regulator®
I O
VacuumSupply
Process
Set Point0-10 VDCor 4-20 mA
E/P
PG
Electro-PneumaticVacuum Regulator
Glove Box / Ventilation Control
The Equilibar can control gas pressures in glove boxes or other ventilation applications.
Supply gas can be provided by a blower or other flow control means, Reference pressure can be provided by an elctro-pneumatic regulator (shown) or manual spring regulator.
I O
R
Gas - Precision Pressure Supply
It is possible to use the Equilibar precision back pres-sure regulator as part of a precision pressure control system, replacing less precise pressure reducing regulators.
A flow control device meters a constant gas flow. The Equilibar is able to vent any excess gas not required by your application. The advantage is far greater precision across widely varying flow rates than by conventional regulators.
Reactor Pressure Control / Nitrogen Padding
The Equilibar® makes it easy to control reactor pres-sure, or to pad vessels with inert gases such as nitro-gen.
Gas inflows to the vessel can be provided by any con-venient means. The Equilibar’s superior flow range (up to 1000:1) and pressure window (down to .02 psi), gives the user a superior operating window. Reference pressure set-point can be provided by the Equilibar® LPR2 for pressures below 0.5 psi, or by an electro-pneumatic regulator for easy computer auto-
I O
R
May, 2010 pg. 8
Water Performance Curves
.
NL Liquid Application Sizing Chart
The chart below is presented to help choose the proper size NL Equilibar® for relatively high liquid flows.
Medium Pressure Water Performance
This chart illustrates how the Overpressure varies only slightly with increasing Set-Point pressure.
Precision vs. Size
For liquid flow applications, larger regulator bodies always increase precision and decrease Overpressure. The water performance of a larger regulator EB5NL6 (shown below) exhibits less Overpressure than the EB3NL3 above.
May, 2010 pg. 9
Air Performance Curves
.
Low Flow/Low Pressure Air Performance
Low flow gas applications reveal the extra-ordinary unmatched precision capable with the Equilibar.
Medium Pressure Air Perf ormance
The chart below illustrates how the overpressure varies slightly with the increasing Set-Point pressure in the Equilibar.
3/8” Equilibar Air Performance Trials - High
3/8” Equilibar Air Performance Trials - Low Flow
May, 2010 pg. 10
.
Manual Control
Equilibar Precision Back Pressure Regulators get their precision from using a fluid set-point pressure (also called ‘reference’ or ‘pilot’ pressure) on their top port.
Customers can supply their own fluid set point signal or chose one of the accessories below.
Set-Point Kits
ApplicationSupply
Pressure Ports
Equilibar Part
NumberOutlet Pressure
RangeRepeatability & Sensitivity
Suggested Pressure Gauge
Ultra Low Pressure
LPR2-7i0.25 to 7 inWC
(0.01 to 0.25 psig)0-10 inWC*
LPR2-14i0.5 to 14 inWC
(0.02 to 0.5 psig)0-30 inWC*
High Precision
max 50 psig T10LR-25p 0.5 to 25 psig 25p-2.5b-2c
T10-25p 2 to 25 psig 25p-2.5b-2c
T10-60p 2 to 60 psig 60p-2.5b-2c
T10-120p 2 to 120 psig 160p-2.5b-2c
Compact Economical
CPR-10 0-10 psig 10p-2.5b-1c
CPR-30 0-30 psig 30p-2.5b-1c
CPR-60 0-60 psig 60p-2.5b-1c
CPR-100 0-100 psig 100p-2.5b-1c
High Pressure
HPR-500p 0-500 psig 500p-2.5b-1c
HPR-1000p 0-1000 psig 1000p-2.5b-1c
HPR-2000p 0-2000 psig 2000p-2.5b-1c
HPR-5000p 0-5000 psig 5000p-2.5b-1c
Vacuum
VPR-30hg 0.4 to 30 inHg
VPR-10hg 0.4 to 10 inHg
Panel mount only
VPR-3hg 0-3 inHg Consult factory
Notes* - No gauge port provided on regulatorAll regulators are self-relieving with continous bleed (consumption)All regulators are designed for air service
VacuumRegulators to 30 inHg
Sensitivity0.1 inHg
20-turn
1/8" Inlet Outlet
(no gauge)30h-2.5b-2
CompactRegulators
1/8"Inlet
OutletGauge
Repeat-ability0.1 psigmax 150 psig
HighPressureRegulators
3000 - 6000 psig
(typical)
1/8"Inlet
OutletGauge
Sensitive through a
wide range of pressures
LPR2Ultra Low PressureRegulator
5 to 20 psig (stable)
Sensitivity: 0.02 inWC
Stability: 0.06 inWC
1/4"Inlet
Outlet(no Gauge)
High PrecisionBelloframType 10
1/4"Inlet
OutletGauge
Sensitivity: .005 psig
max 150 psig
May, 2010 pg. 11
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Process Automation
Automating your process pressure is easily accomplished by using an electronic pressure regulator to provide the set-point pressure to the Equilibar dome-loaded back pressure regulator.
Equilibar is proud to represent precision electronic regulators from Proportion-Air. These devices are custom tuned on the bench to work perfectly with the Equilibar.
Contact Equilibar or visit our website for additional details about the many possible configuration of these products.
Set-Point Controllers
Ultra Precision Regulators (QPV / MPV Series)QPV Series
Aluminum IP65 enclosure Optional digital display
(shown) 4-20 mA or 0-10 VDC
MPV Series Same internals as QVP
0-10 VDC command inputCard, DIN, or manifold mount
Precision Regulators QB1 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 * 0.2 to 0.5% FS accuracy * Tuned ready for set-point service * Good for most applications
QP1 High PressureAluminum IP65 enclosure
4-20 mA or 0-10 VDC
* Min range: vacuum; 0-1 psig * Max range: , 0 -1000 psig * 0.5% FS accuracy
* Min range: 0-0.3 psig, vacuum * Max range: 0-150 psig * Superior proportional valve action * Accuracy: 0.1% - 0.5% FS * Resolution: 0.005% - 0.2% FS * Lowest available pressure range in class * Tuned ready for set-point service * Optional DeviceNet / Serial communication
May, 2010 pg. 12
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Contact our EngineersAt Equilibar, your application’s 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: inquiry@equilibar.com
Telephone: (828)650-6590
Fax: (801)504-4439
Address: Equilibar, LLC 320 Rutledge Road Fletcher, NC 28732
Application Engineering . . . How we are different
Unlike 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, typi-cally 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 sup-port you with start-up information or (if needed) expedited replacement parts.
About Equilibar
Equilibar, LLC manufacturers 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.
Other products from Equilibar
GS Series Back Pressure Regulators The GS Series has the same exact performance as the NL Series BPRs. This series is made specifically for gas and mixed phase applications due to the 2-piece body design.
Instrument Series BPRs Our new Instrument Series dome loaded back pres-sure regulators offer performance up to 5000 psig and temperatures up to 3270C with the use of SS316 diaphragms and Kalrez® o-rings.
EVR Series Vacuum Regulators The EVR Series uses the GS Series BPR, but adds a manual set-point kit to make vacuum control of processes easy and simple.
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