Research Series Back Pressure Regulators | Equilibar Precision Control

Research Series Back Pressure Regulators

Precision at high pressures and low flow rates

Equilibar® Research Series back pressure regulators solve critical performance problems for laboratory and gas analysis systems worldwide. They are especially popular for applications such as catalysis research and reservoir core analysis.

Equilibar has several different trim styles and many different diaphragm materials in the Research Series designs to help meet many demanding research conditions. The Research Series back pressure regulators work through an incredibly wide range of flow, pressure, and temperature. Materials include Hastelloy, SS316L, PTFE, and FFKM (Kalrez), to name a few.

Maximum temperature ranges of the research back pressure regulators are standard 150°C, with the capability to go up to 200°C (with viton seals and metallic diaphragm) and 325°C (with Kalrez seals and metallic diaphragm). In extreme temperature cases, High Temperature (HT) models can be used in processes up to 450°C.

Primary Research Series Types

Series Name Internal image Max Pressure psig/bar(g) Min Cv Max Cv Advantages
Low Flow
high pressure regulator To 1000 psig / 69 bar(g) 1E-8 0.07 Ultra wide flow range, superior multi-phase flow
High Pressure
To 10,000 psig / 690 bar(g)
Higher Flow
high flow internal rendering To 1000 psig / 69 bar(g) 1E-5 0.41
High Pressure & Flow
To 10,000 psig / 690 bar(g) 0.35
High Temp
Equilibar HT Series back pressure regulator To 5000psig / 345 bar(g) 1E-5 0.07 High Temperature applications
High Temp & Flow
To 5000 psig / 345 bar(g) 0.35
Zero Flow
Equilibar zf research series internal CAD image To 2000 psig / 140 bar(g) Effective Zero 0.01 Nano flow range; excellent multi-phase flow
Ultra Low Flow
rendering of ultra low flow internal To 10,000 psig / 690 bar(g) 1E-9 0.015 Offers lower flow than HP in some applications


Research Series valve are available in port sizes of 1/16″, 1/8″ and 1/4″ to accommodate most low flow / low dead volume requirements. For larger port sizes and flow rates see Equilibar’s General Service Series and Industrial Service Series valves.

Canadian Registration Number (CRN) certification available on select Research Series models for all territories and provinces. Please contact us for more information.

No matter if your application requires precision pressure control of liquid, gas, mixed phases, or even a slurry, our application engineers can specify a suitable back pressure regulator for your application.

Contact an Engineer Technical Literature


Use the table at left to view the family of research series products, then contact an application engineer to answer your questions.


Or use the product selector at the bottom of this page to choose a back pressure regulator by pressure or size requirements

image of EPR 3000 controlling pilot of Equilibar H3P high pressure back pressure regulator

Equilibar H3P high pressure research series back pressure regulator with an EPR 3000 high pressure electronic pilot regulator



Choose Your Back Pressure Regulator

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Other Equilibar Back Pressure Products:

research series back pressure regulator Research Series Back Pressure Regulators 1/16" to 1/4" up to 10,000 psig / 690 bar(g)
general service back pressure regulator GS series General Service Back Pressure Regulators 1/4" to 1" up to 2500 psig / 172 bar(g)
industrial service back pressure valve BD seriesIndustrial Service Back Pressure Valves 1.5" to 4" up to 150 psig / 10 bar(g)
Equilibar GSDM8 with electronic pilotElectronic Back Pressure Regulators 1/4" to 4" up to 5000 psig / 344 bar(g)
Equilibar News
David Reed and Julie Detmering with undersecretary of commerce and e star award

Equilibar receives national recognition for growth & expertise in exports

At a May 14 ceremony in Washington, DC, the U.S. Department of Commerce honored Equilibar with the 2024 President’s “E Star” Award in recognition of the company’s continuing notable contributions to an increase in U.S. exports. The “E Star” Award recognizes at least four years of additional export growth by American companies that previously received Read More

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