It is diaphragm type back pressure valve.With adjustable setting pressure,it can keep metering pumps dosing accuratly and be an anti-syphon.

• 背压阀为隔膜式，能调整设定压力。可在定量泵浦输送时，建立稳定输送压力，输送精确定量的药液，并可防止虹吸。