... and introduction valve .Features1.Very high safety of operation. Mechanical actuate diaphragm. Changeable eccentric drive2.Power off seal,no leakage ... also the EPDM stretch rubber to cover all of the body.PurposeWidely used in petroleum, chemical industry, electric power, metallurgy, ... industry, agriculture, national defense department and etc.Measurements JMW Mechanical Diaphragm Metering Pump