... diaphragm metering pump;>>With built-in automatic venting, pressure release and automatic oil feeding valve;>>Enhanced outstanding performance, safety and ... superior performance;>>High efficient inlet and out let check valve assembly;>>Pump body can be made of PVC, ... 304, 316, 316L, etc.>>Application widely in Petroleum, Natural Gas, Power Plant, Oil Refining, Chemical, Metallurgy, Water Treatment, ...