Plunger metering pump hydraulic end of the main components: (1) inlet and outlet check valve pump inlet, outlet check valve can be spring check valve or single / double check valve. Check valve in the form of ball valve, plate valve or cone valve. Ball valve structure is simple, easy processing, the most used in metering pumps. Ball valve single ball valve and double ball valve two. Double ball valve to improve the sealing effect of the valve, when a valve failure, the other valve can work, to ensure the accuracy of infusion. To improve the measurement accuracy is very high, the use of tapered valve. The valve and seat material is based on the media delivered. Valve ball hardness should be greater than or equal to 400HB, the seat hardness should be greater than 200HB. Common materials are stainless steel, high nickel alloys and ceramics. Carbide may be used when transporting media containing solid particles such as slurries. (2) Hydraulic end (pump head) The overcurrent parts are made of carbon steel, l2% Cr, 304SS, 316SS, 17-4PH, 20 alloy, plastic and other special alloys. (3) plunger seal Plunger metering pump often used packing seal, commonly used sealing materials are PTFE, Viton and flexible graphite. 2. Valve Parts To ensure the metering accuracy of the diaphragm metering pump, the metering tank of the diaphragm metering pump is equipped with a safety valve, a bleed valve and a charge valve so that the volume of hydraulic oil in the hydraulic chamber between the plunger and diaphragm remains constant. When the pressure in the hydraulic chamber exceeds the specified allowable pressure, the safety valve opens. When the discharge line pressure abnormal rise, the safety valve can also play a role in protecting the entire system. The bleed valve is used to discharge the gas in the hydraulic chamber from the hydraulic chamber when the plunger is working. The role of charge valve is to compensate for the hydraulic chamber due to leakage and reduce the amount of hydraulic oil.
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