Fluid handling – Systems – Multi-way valve unit
Patent
1983-12-23
1985-01-22
Smith, Leonard E.
Fluid handling
Systems
Multi-way valve unit
91306, 91313, 417393, F16K 100
Patent
active
044945744
ABSTRACT:
A diaphragm pump pumping arrangement includes two diaphragm pumps which are arranged and operate in tandem. Each of the diaphragm pumps includes a housing and a movable wall that includes a flexible diaphragm and subdivides the interior of the respective pump housing into a pumping chamber and an actuating chamber. An air distributing control arrangement interposed between and connected to the pump housings includes a spool valve movable in a bore of an aluminum casing of the control arrangement between two end positions in which it alternatingly achieves the admission of the compressed air into one, and discharge of the air from the other, actuating chamber. The spool valve is displaced due to the action of respective switching valves accommodated in individual bores of the control arrangement and displaced by the respective movable walls from their rest positions in which they admit the ambient pressure to the associated end faces to their active positions in which they admit the compressed air to the associated end faces of the spool valve. Each switching valve has an actuating portion that passes through a central passage of an annular element stationarily mounted in the respective bore, with a greater clearance at first, and with a lesser clearance later. A substantially radial passage in the annular element opens onto the zone of the central passage upstream of the lesser clearance, so that compressed air propagates into the radial passage unless prevented from doing so by a seal in a first position of the switching valve, and the lesser clearance provides a throttling action at all times, assuring pressure relief in the radial passage when the seal is in effect.
REFERENCES:
patent: 3618468 (1971-11-01), Gardner et al.
patent: 3811795 (1974-05-01), Olsen
patent: 4104008 (1978-08-01), Hoffman et al.
patent: 4381180 (1983-04-01), Sell
Casilli Joseph C.
Gibson Lawrence
Hessler William D.
International Telephone and Telegraph Corporation
O'Halloran John T.
Ruzek Peter R.
Smith Leonard E.
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