Fluid Controls Ltd is one of the UK’s leading distributors for pressure control
Back pressure regulators

How back pressure regulators work

At Fluid Controls, we supply back pressure regulators from some of the industry’s leading manufacturers. From Equilibar’s sensitive high-performance back pressure regulators to spring-loaded high pressure BPR’s from Thompson, Dutch and Burling Valves – we have an extensive portfolio to suit most applications. In this informative article, we explain how back pressure regulators work.

Before we begin, let’s consider the working principle of back pressure regulators.

Working principle of back pressure regulators

Back pressure regulator is a type of control valve that maintains set upstream pressure – i.e. controls inlet pressure. In layman’s terms, it maintains the set pressure and allows the excess pressure to vent through the regulator. Back pressure Regulator function is similar to a relief valve, except the emphasis is on accurate pressure control provided by use of a sensing element as opposed to spring force on a small ball over an orifice.
Back pressure regulator is a normally closed valve due to the loading force applied on sensing element by use of normal mechanical spring or pneumatic / hydraulic pressure. The force on the diaphragm or sensor is transferred to the valve /seat control element. This keeps the valve closed until the system pressure increases on the inlet port. This increasing pressure provides counter force under the sensor to oppose the loading force from the top. Once the system pressure exceeds the loading pressure, the pressure / force under the sensor pushes the valve up and hence opens the seat orifice to allow the fluid to flow through. This action of flow / vented fluid reduces the system pressure until equilibrium state is achieved. At this point the system pressure is exactly the same as loading force and set pressure of the system is achieved.

Purpose of back pressure regulating valves

The desired function of a back pressure regulator is to limit and precisely control the upstream pressure of a system. A back pressure regulator can be used to control pressure of any fluid – gas, liquid or a mixture in a system Most pumping applications require back pressure to be maintained on the outlet of a pump.

For example, if a client comes to Fluid Controls looking to install a regulating valve at the end of a tank’s return line, they would need a BPR that could control the pressure upstream to maintain the line pressure and only vent the excess pressure to the return line. One of our back regulators would be able to maintain the system pressure and supply an accurate fluid pressure to the process.

These reliable devices remain closed, preventing the flow to the downstream only after the system pressure is achieved. As a result, this ensures that all equipment used before the back pressure regulating valve will be supplied with the correct pressure and maintain the effectiveness of the process.

For more information about our range of back pressure regulators, contact Fluid Controls today on 0118 970 2060 or via email at fluid@fluidcontrols.co.uk.

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