Learning Center

Troubleshooting and Solutions for Back Pressure Valve


The back pressure valve is one of the indispensable accessories for the use of metering pumps. The following is an analysis and solution of the faults that may be encountered during the use of the back pressure valve.

Failure

Reason

Solution

Insufficient back pressure

Improper back pressure adjustment

Adjust the set pressure by rotating the adjusting nut. Turn clockwise to increase the pressure, and turn counterclockwise to decrease the pressure.

There may be impurities between the valve base and diaphragm

Take it apart, clean it carefully, reassemble it, and then adjust the pressure

 it still cannot withstand the pressure even after the spring is tightened.

There may be impurities between the valve base and diaphragm

Take it apart, clean it carefully, reassemble it, and then adjust the pressure

Leakage under low pressure

The PTFE sealing surface is hard and the sealing effect is not good.

If the medium has no corrosion to EPDM rubber, EPDM rubber can be installed downward as a sealing surface.

There may be impurities between the valve base and diaphragm

Take it apart, clean it carefully, reassemble it, and then adjust the pressure

Back pressure is too high

Improper back pressure adjustment

Turn the adjusting nut to adjust the set pressure. Turn counterclockwise to reduce the pressure.

Liquid leaks from the upper valve body vent hole

Ruptured or torn septum

Remove and replace all damaged parts, be sure to remove internal impurities before replacement

Safety tip: If the back pressure valve is installed in the main pipe at the pump outlet, the back pressure set pressure must not exceed the rated working pressure of the pump. Failure to do so may cause damage to the pump.


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