Back Pressure Valve

What is back pressure valve? How does an back pressure valve work?

Back Pressure Valve Introduction

An automatic recirculation valve is a kind of pump protection device. It automatic protects the centrifugal pump when a pump body occurs cavitation damage or unstable (especially conveying hot water at low load operation). Once pump flow is lower than the preset flow, bypass can completely open to ensure the minimum required flow pump. Even running fully closed, the namely the main flow is zero, the minimum flow can also discharge from the bypass.

Working Principle

This valve is self-support type, do axial movement along with valve disc by spring force function, so as to generate differential pressure around the back pressure valve. Meanwhile, the valve seat hole opening bigger and bigger gradually until pressure differential reaches the setting point.


In order to make the valve achieve to the best performance, BPV should be installed in downstream of the important protected valve, since valve outlet velocity is high, the installation location should be close deaerator or water supply tank.


Be easy to operation and maintenance. We can provide installation and maintenance manuals.

Valve size

DN25~DN150(1″-6″)Standard size: DN25~DN150(1″-6″)

Pressure range

Nominal pressure range: PN10~PN400(ANSI 150Lbs~ANSI 2500Lbs).Another pressure range is according to requirements.


Flange connection standard is according to DIN or ANSI, another standard (e.g. ISO, BS, JIS, NF) can be customized.

YB7 Back Pressure Valve

How does an YB7 back pressure valve Install?

In order to make the valve to achieve best performance, YB7 should be installed in the downstream of the protected valve, since valve outlet velocity flow is high, installation location should near close to deaerator or tank.


Back Pressure Valve Install
Back Pressure Valve Parts

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ZD series

Automatic recirculation control valve

YB7 series

Back Pressure Valve

ZHD series (Electric/pneumatic)

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