A two-stage air valve actuator for a double-diaphragm pump

摘要

A double diaphragm pump operated by selectively switching pressurized air into either of two diaphragm chambers; the air actuator valve is a cup valve which is slidable over orifices in a valve plate, and actuable by air pistons; the air pistons are coupled via passageways to a pilot valve which is a second cup valve slidable over orifices in a valve plate, the cup valve being actuable by pins extending into the diaphragm chambers and into contact with diaphragm members at predetermined positions.