About the General Service series back pressure regulators

Cv: 1·E-03 to 8.50  |  Max. Temperature: 300°C  |  Max. Pressure: 206 barg (3000 PSI)


The GS (General Service) series offers a wide range of dome loaded control valves for installations requiring high precision control of gas, liquid and mixed-phase flow. The valves are available from ¼” up to 1” in. line size. These line sizes are very common in pilot and other small-scale production plants.

As a result of the unique multiple orifice designs, the Equilibar valve capacity goes from a Cv-value of 1 all the way up to 10 on a limited footprint. Furthermore, the rangeability surpasses that of traditional control valves. Where standard globe valves often offer a rangeability if 1:40, a single Equilibar® dome loaded control valve can offer 1:10.000 and often 1:100.000. This explains how an Equilibar valve is capable of handling both liquids and gases with one single valve.


The robust design of the general service series is available for low pressure applications, controlling only a few cm water column up to 200 bar gauge. Especially relevant is that a diaphragm, which seals a large number of orifices, is the only moving part. In the different models, the size and number of the orifices are varied. Standard units are suitable for process conditions up to 175°C with PGL (PTFE glass reinforced) diaphragms and Viton o-rings. If you equip an Equilibar® GS with metallic (or polyimide) diaphragms and Kalrez o-rings, the units can handle process conditions up to 300°C.

Units can be built out of many types of material, including stainless steel 316, Hastelloy, PTFE, anodized aluminum and polymeric materials like PVC, PEEK and PVDF. The process connections are standard in NPT or BSPP female thread. Custom flanges are also available on request.

In some cases we also design something new. A special GSDH2 back pressure regulator was designed so it can handle a pressure of 250 bar gauge at a maximum of 300°C, with a required Cv of 1.7. You can more information about this in our blog: “Special GSDH2 Back Pressure Regulator”.

If you require lower capacity valves, the research series probably offers what you are looking for. The Cv in the research series valves ranges from 0 to 0.6. Higher capacities are available in the BD series. Because the technology is scalable, Equilibar offers larger units in the BD Series up to 4” piping with a capacity Cv of 160.

You can find more in-depth information about the various back pressure regulators below.

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The working of an Equilibar Dome Loaded Back Pressure Regulator

How to Rebuild your Equilibar Back Pressure Regulator

Different materials that are used to make Equilibar Back Pressure Regulators and diaphragms