The Pressure Relief Valve is one of the indispensable accessories for the use of metering pumps. The following is an analysis and solution of the failures that may be encountered during the use of the back pressure valve.
| Failure | Reason | Solution |
| Not enough pressure | Improper pressure regulation | 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 | |
| There is still medium passing through after the spring is compressed. | There may be impurities between the valve base and diaphragm | Take it apart, clean it carefully, reassemble it, and then adjust the pressure |
| There is 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 | |
| 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 |
| When the pump is running, there is medium coming from | Pressure adjustment is too small | Adjust the set pressure by rotating the adjusting nut. Turn clockwise to increase the pressure, and turn counterclockwise to decrease the pressure. |
