How Does the Back Pressure Valve Work?

Performance

Back pressure valve realizes the action 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 elastic force. When the system pressure is larger 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 curtain, which is 0.1–1.0 MPa.

A nonadjustable back pressure valve for dosing pump

Nonadjustable back pressure valve

An adjustable back pressure valve for dosing pump

Adjustable back pressure valve

Function of Back Pressure Valve

  • When the pipeline or equipment container pressure is unstable, the back pressure valve can maintain the pressure required by the pipeline, so that the dosing pump can normally output flow.
  • When the siphon occurs at the outlet of the pump due to gravity or other effects, the back pressure valve can reduce the flow and pressure fluctuations caused by the siphon.
  • For dosing pumps and other volumetric pumps, when working under low system pressure, excessive delivery will occur. In order to prevent similar problems, the outlet of the dosing pump must be at least 0.7 bar back pressure, it is generally achieved by installing a back pressure valve at the outlet of the dosing pump.