Unlike traditional pressure reducing regulators that open to increase pressure, these relieving-type or backpressure-type regulators open up to reduce pressure.
Equilibar’s relieving back pressure regulators are dome-loaded and use a 1:1 air pilot pressure on their dome to communicate the set-point. The set-point signal can be communicated by either manual or electro-pneumatic pilot regulator.
Relieving pressure regulators are available in a wide range of sizes:
- 1/4″ to 1″ – GS Series back pressure regulators
- 1.5″ to 4″ – BD Series back pressure valves
- 4″ to 6″ – HV Series back pressure valves
The following chart illustrates the ability of the Equilibar back pressure regulator to control in the range of 3 inWC (inches of H2O).
Pilot Regulator Options for Low Pressure Control
Manual Control | Computer Control | |||
Product | LPR2 | QPV | ||
in H2O | millibar(g) | in H2O | millibar(g) | |
Lowest Pressure Range | 0.5 to 7 | .75 to 17 | 0 – 4 | 0 – 10 |
Sensitivity | 0.02 | 0.05 | 0.01 | 0.03 |
Other Pressure Ranges | 1 – 10 1 – 28 | 2.5 – 25 2.5 – 70 | 1 – 10 1 – 28 | 2.5 – 25 2.5 – 70 |
Selected Applications for Low Pressure Relieving Valves
Application | Schematic |
Pressure Regulator for Tank Blanketing or Padding | ![]() |
Controlling Pressure in an Extrusion | ![]() |
Protecting Rupture Discs using Back Pressure Regulators | ![]() |
Simulating Changes in Altitude using Equilibar Vacuum Regulators | ![]() altitude simulation chamber pressure control |
Controlling Pressure Referenced to Absolute Pressure Units | |
![2 set point options](https://www.equilibar.com/wp-content/uploads/2015/04/2-set-point-options.gif)
The Equilibar back pressure regulator relieves flow to control pressure. It has a 1:1 dome-loaded design, and can be piloted by either a manual or electronic pressure regulator
![Relieving back pressure regulator can be used to control liquids or gases in the very low pressure range. Shown with precision electronic pressure regulator](https://www.equilibar.com/wp-content/uploads/2015/08/low-pressure-relieving-regulator-electronic.jpg)
Relieving back pressure regulator can be used to control liquids or gases in the very low pressure range. Shown with precision electronic pressure regulator
![HV Back Pressure Regulators](/wp-content/uploads/2015/04/HV-Back-Pressure-Regulators.jpg)
The Equilbar HV32 relieving back pressure regulator is available in 2″, 4″, and 6″ sizes for precise low pressure control at high flow rates