Double-diaphragm pumps

Details Double-diaphragm pumps Double-diaphragm pumps

F - Mech Eng,Light,Heat,Weapons

04

B

103/36

F04B 43/02 (2006.01) F01L 25/06 (2006.01) F04B 9/135 (2006.01) F04B 43/073 (2006.01)

Patent

CA 1246388

ABSTRACT (Figure 1) IMPROVEMENTS RELATING TO DOUBLE-DIAPHRAGM PUMPS A double diaphragm pump comprises a centre body 10 and two end-caps 11, 12, the outer peripheries of two diaphragms 20, 21 being clamped between the centre body and the two end-caps respectively. The diaphragms are interconnected by a hollow push-rod 26 slidably and sealingly mounted in a bush 17 in the centre body. A shaft 30 extends centrally through the push-rod, diaphragm and end-cap and has a radial flange at one end and a nut engaged on a screw-thread at its other end whereby the end-caps, diaphragm and centre body are clamped axialy together. Air under pressure is supplied to the two axially outer chamber 23, 24 formed between the diaphragms and the end-caps under the control of a change-over spool valve 45, change-over operation of which is initiated by the approach of the push-rod 26 to either end of its reciprocating movement.

494648

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