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2018

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08

Working principle of back pressure valve Animation diagram

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The back pressure valve 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 elastic force; when the system pressure is greater than the set pressure, the diaphragm compresses the spring and the pipeline When connected, 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, ranging from 0.1 to 1.0 MPa.

  The back pressure valve 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 elastic force; when the system pressure is greater than the set pressure, the diaphragm compresses the spring and the pipeline When connected, 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, ranging from 0.1 to 1.0 MPa.

  When the pressure in the pipeline or equipment container is unstable, the back pressure valve can maintain the required pressure in the pipeline so that the pump can normally output flow. In addition, 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 siphon. For volumetric pumps such as metering pumps, excessive delivery will occur when operating under low system pressure. In order to prevent similar problems, the outlet of the metering pump must have a back pressure of at least 0.7 Bar. This is generally achieved by installing a back pressure valve at the outlet of the metering pump.

 

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