When to use Back Pressure Regulators

As many of you are aware, there are various types of pressure and vacuum regulators from high pressure and compressed to precision and stainless steel.

A key product to many industries is the back pressure regulator. But what is it, how does it work, when is it the most effective and why?

What is a back pressure regulator?

A pressure reducing regulator is a device which reduces a high source pressure to a lower working pressure that makes it much more suitable for a user to use.

The regulator attempts to maintain the outlet pressure within acceptable limits as other conditions, such as gas or liquid vary, and the accuracy and efficiency is determined by the combination of basic regulator elements.

There are 3 basic regulator elements that are common to all pressure regulators, regardless of the manufacturer.

Now a back pressure regulator has the special function to limit and precisely control the upstream pressure of a gas or liquid, such as from a tank or pump.

airchild pressure regulator

How do back pressure regulators work?

As aforementioned, there are 3 basic elements that will determine the regulator’s accuracy and efficiency performance wise. These include:


Loading Mechanism

Sensing Element

Control Element

When to use a back pressure regulator?

Jordan pressure regulator

There are various types of back pressure regulator including:


Spring load

Dome load

Air load

Spring and dome load

Why use back pressure regulators?

In terms of efficiency, it is much more accurate than a relief valve.

Most direct spring operated safety relief valves have a high reseating pressure. This means they’re inconsistent and unreliable.

Safety relief valves are designed to protect downstream personnel and equipment should over-pressurisation take place. So when it’s set pressure is overcome, it will blow wide open immediately and exhaust all of the pressure.

It needs to be able to handle the full flow of the system in order to rapidly exhaust to protect downstream apparatus. A backpressure regulator is not a safety device, it is designed for precision upstream pressure control.

When the regulator set-point is overcome, it will crack open (not blow wide open) and try to exhaust just the excess pressure above the set-point. What’s more, if it does cracks open, it uses its sensing element to reseat very close to its original set pressure- relief valves do not have sensing elements.

Fine Controls UK Ltd

Fine Controls supply of process controls and instrumentation equipment since 1994, and now serves an ever-expanding customer base, both in the UK and globally.

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