Ultra-Sensitive Dome-Loaded Back Pressure Regulator RV-22

Ultra-Sensitive Dome-Loaded Back Pressure Regulator RV-22

The RV-22 is a highly sensitive dome-loaded back pressure regulator (BPR), suitable for controlling pressure in the range of 2 to 66 cmH2O with gas flow rates between 1 and 200 liter/minute. The RV-22 is not FDA approved for medical use. However, it is suitable for testing and validation of systems requiring highly precise control of air and oxygen-enriched air pressure control.

How It Works

The RV-22 is a dome-loaded pressure regulator with pilot operation. This means gas or air is fed into the top (dome) area of the regulator to provide the pressure setpoint in a 1:1 ratio. The pressure of the gas in the dome is set by a separate mechanical or electro-pneumatic device, such as the RVP mechanical pilot regulator. This pilot pressure forces the flexible diaphragm down onto a plate of orifices. A rise in inlet pressure lifts the diaphragm up to allow excess pressure to be relieved through the outlet orifices. Similarly, a loss of pressure at the inlet causes the diaphragm to be pushed closer to the orifices, restricting flow and rebuilding pressure upstream.

Please contact us with questions or comments at inquiry@equilibar.com


dimensional drawing of RV-22

  • HDPE body; PE diaphragm
  • Max Pressure: 140 cm H2O (2 psig)
  • Valve coefficient (Cv) rating: 4
  • Flow range: up to 200 lpm
  • Inlet/Outlet Ports: 22 mm
  • DIM A: 1.8 in (45 mm)
  • DIM B: 4.0 in (102 mm)
  • Pilot Port: 1/8″ NPT
  • Temperature rating: 40 °C


The RV-22 back pressure regulator keeps precision across a wide range of flow rates and a wide range of pressure setpoints. Below is a graph of the performance showing stability from 1 to 200 liters per minute at several pressure setpoints.

performance graph of RV-22


RV-22 Options:

  • RV-22 (Standard 22 mm inlet/outlet port)
  • RV-22-B (standard with bracket)
  • RV-22-N (1/2” NPT inlet/outlet ports)
  • RV-22-N-B (1/2” NPT ports with bracket)



How the RV-22 control valve works


How to assemble the RV-22 after cleaning or maintenance


schematic of how the RV-22 ultra sensitive air relief valve works

drawing of RV-22 oblique view with labels

CAD drawing of RV-22 relief valve top view with labels

First RV-22 produced

photograph of RV-22 back pressure regulator with bracket

RV-22 with optional bracket

supplevent ventilator photo courtesy of LLNL

Blog: SuppleVent(tm) ventilator using RV-22 receives FDA emergency use approval. Photo courtesy of LLNL

ventilator valve with tubing

Blog: RV-22 valve being tested in ventilator system prototypes

*Equilibar control valves have historically not been for use in commercial ventilator systems. In connection with the COVID-19 pandemic, Equilibar has retrofitted its valves for potential use in connection with medical ventilator systems. While our valves are not approved for any medical use by the FDA or any other governmental agency, Equilibar plans to produce these valves in volume and offer the valves, with affordability in mind to the extent possible, to businesses or governments who are actively seeking or agree to seek qualifying approval for the sale or distribution of integrated systems for use within a medical setting from the U.S. Food & Drug Administration (“FDA”) or other similar governing agency in local jurisdiction. Your agreement to any terms of sale with respect to our valves asserts that you are a technically competent entity capable of evaluating system risk and seeking Emergency Use Authorization from the FDA or other similar governing agency in local jurisdiction.

All rights to use our valves shall be effective from the date we provide the valves to you until such time as we notify you that your use must end which reasons may include, without limitation, end of the existing pandemic or recalls for safety reasons.

Use of our valves and/or drawings shall be solely as provided for in a legal agreement with you which will include, in part that any sale is (i) not and does not represent medical or legal advice by Equilibar, (ii) is not approved or available as alternative to an FDA approved ventilator and (ii) AS IS, WHERE IS, AND WITH ALL FAULTS’’. If you do not agree with any of the foregoing do not purchase or use any of our valves for use other than as originally intended (i.e. commercial ventilator systems).

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