Back pressure bypass valve

The back pressure valve actually operates through the elastic force of the built-in spring: when the system pressure is smaller than the set pressure, the diaphragm blocks the pipeline under the action of the spring force; when the system pressure is greater than the set pressure, the diaphragm compresses the spring, The pipeline is connected and the liquid passes through the back pressure valve.
The structure of the back pressure valve is similar to that of the one-way valve, but the opening pressure is greater than that of the one-way valve, generally between 0.1 and 1.0 MPa.
If the pipeline or equipment container pressure is unstable, the back pressure valve can maintain the required pressure of the pipeline so that the pump can output the flow normally. In addition, a siphon phenomenon often occurs at the outlet of the pump due to gravity or other effects. At this time, the back pressure valve can reduce the flow and pressure fluctuations caused by the siphon. For positive displacement pumps such as metering pumps, when working at low system pressures, overdelivery will occur. In order to prevent similar problems, the outlet of the metering pump must have a back pressure of at least 0.7 Bar, which is generally achieved by installing a back pressure valve at the outlet of the metering pump.