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PTFE Back Pressure ValvesMaterial: PTFESize: DN15, DN25, DN40Pressure: 0-3barsLGP back pressure valve is diaphragm type. The valve works with the help of spring. When the inlet side pressure is lower than the preset pressure, the diaphragm is closed with force of the spring. When the inlet side pressure is higher than the preset pressure, the diaphragm is jacked up, the medium go though the valve. The back pressure valve can make the pressure steady after setting.Back pressure valve shall be installed at the outlet of metering pump in order to reduce siphon and excess feeding, and ensure the m