VALVE FOR A DIAPHRAGM PUMP

摘要

A diaphragm pump (10) including a body (11) that provides a pair of opposed pump chambers (12) and (13). Mounted in the body (11) is a piston assembly (14) providing a pair of pistons (15) joined by a transverse piston rod (16) so that the pistons (15) are caused to reciprocate in unison linearly in the direction (17) along the axis (18). Each piston (15) includes a diaphragm (22) that provides a first sub-chamber (23) and a second sub-chamber (24). A working fluid (liquid or gas) under pressure is alternately delivered to the sub-chambers (23) to cause the piston assembly (14) to reciprocate. A valve (25) is operated to co-ordinate delivery of the fluid under pressure or alternately to the first sub-chambers (23).

主权项

1. A pump having:
a pump body providing a pump chamber; a piston movably mounted in the body for reciprocation relative to the body; a diaphragm sealingly connecting the piston to the body so as to divide said chamber into a first sub-chamber and a second sub-chamber: first ducting, said first ducting being in communication with said first sub-chamber to provide for the flow of a pumped fluid to and from said first sub-chamber; second ducting, said second ducting being in communication with said second subchamber to provide for the flow of a working fluid to and from said second chamber to cause the reciprocation of said piston; a valve to provide for the delivery and exhaust of the working fluid with respect to the second sub-chamber, the valve including: a valve body having a delivery duct, a first exhaust duct and a second exhaust duct; and a movable valve element mounted in and movable with respect to the body to provide for the timed connection of the delivery duct with the second sub-chamber to deliver the working fluid thereto, and the timed connection of the first and second exhaust ducts with the second subchamber to duct the working fluid from the second sub-chamber.