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2019

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What is the function of back pressure valve? How to deal with stress?

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What is the function of back pressure valve?       1. The one-way valve on the outlet pipe is used to prevent liquid backflow, and the back pressure valve is used to keep the pressure at the pump outlet constant.   2. The system can be used as a safety valve when the requirements are not very strict.   3. Cooperate with pulsation dampers to reduce the damage of water hammer to the system, reduce the peak value of speed fluctuations, and protect pipes, elbows, and joints from pressure fluctuations.

       What is the function of back pressure valve?

      1. The one-way valve on the outlet pipe is used to prevent liquid backflow, and the back pressure valve is used to keep the pressure at the pump outlet constant.

  2. The system can be used as a safety valve when the requirements are not very strict.

  3. Cooperate with pulsation dampers to reduce the damage of water hammer to the system, reduce the peak value of speed fluctuations, and protect pipes, elbows, and joints from pressure fluctuations.

  4. Create a good working environment for the metering pump and improve the performance of the pump.

  5. To ensure a stable water flow pump, for example, if the flow rate and pressure of some pumps change, you can set a back pressure valve at the outlet of the pump. The output flow rate of the pump is stable, and then the actual operating pressure of the pump is usually selected or slightly lower than the back pressure valve. to the operating pressure of the pump.

 

  6. When the pressure of the pipeline or equipment container is unstable, it can maintain the required pressure of the pipeline so that the pump can output flow normally.

  7. Gravity or siphon phenomenon often occurs at the outlet of the pump or other roles. The back pressure valve can reduce the flow and pressure fluctuations to produce siphon. Then generally choose a pressure greater than the liquid itself. For example, to prevent the liquid level from being 2 meters for drugs, you can choose back pressure. The pressure of the valve is greater than 0.02 MPa, and 0.1 MPa is generally used.

       Pressure adjustment method of metering pump back pressure valve

  1. Connect the back pressure valve and pump to the pipeline, and install the pressure gauge on the pipeline at the inlet end of the back pressure valve.

  2. Pull out the upper cover of the back pressure valve and use a screwdriver or wrench to rotate the adjusting nut counterclockwise to the loosest position (spring pressure cannot be felt).

  3. Open the pipeline valve so that the outlet end of the back pressure valve is at normal pressure. After starting the pump, turn the back pressure valve adjusting nut clockwise while observing the pressure gauge indication and adjust to the required pressure value.