PNEUMATICALLY SHIFTED RECIPROCATING PUMP

摘要

A pneumatically actuated reciprocating fluid pump and shuttle valve combination is pneumatically shifted by pressurized air that exhausts from a respective pressurized bellows, diaphragm, or piston chamber, as the bellows, etc. nears the end of its pressure stroke (the exhaust stroke of the pumped fluid). This pressurized air exhausts from the bellows chamber via a shifting piston and cylinder mechanism within the bellows chamber that opens the bellows chamber at a specified location or point in the pump pumping cycle. The pressurized air exhaust from the bellows chamber acts on the end of the shuttle valve spool element to shift the spool element to its opposite position, which reverses the application of pneumatic pressure and atmospheric exhaust between the two bellows chambers to actuate the reciprocating pump.