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Back pressure valve
Back pressure valve

The back pressure valve is operated by the spring force of the built-in spring. When the system pressure is smaller than the set pressure, the valve is blocked by the spring force. When the system pressure is larger than the set pressure, the diaphragm compression spring , The pipe is connected, the liquid through the back pressure valve. The back pressure valve structure is similar to the one-way valve , but the opening pressure is greater than the one-way valve, between 0.2 and 1.6 MPa.

In the pipeline or the equipment container pressure instability, the back pressure valve can maintain the required pressure of the pipeline, so that the pump can output the normal flow of the other at the pump end due to gravity or other effects often appear siphon phenomenon , this time The back pressure valve can reduce the fluctuation of the flow and pressure due to the siphon , and the excess pump will be delivered when the metering pump is operated at low system pressure. To prevent a similar problem, the outlet of the metering pump must be at least 0.7Bar Of the back pressure, generally through the metering pump outlet to install the back pressure valve to achieve the purpose.