Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1992-06-15
1994-03-08
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 33, 251 63, 251144, 261DIG3, 261DIG46, F16K 31122
Patent
active
052921034
ABSTRACT:
A valve (10) for draining liquid from a reservoir, for example, the reservoir (56) in the base of an evaporative cooler (50). The valve (10) comprises a housing (12) having a first inlet (14) for supplying a pressure transmitting fluid, for example water, to the housing and an outlet (18) for draining liquid from the reservoir. A plunger (22) is slidably received in the housing (12) and adapted to move from an open position in which the outlet (18) is open and liquid can drain out, and a closed position in which the plunger (22) closes the outlet (18) and the liquid is prevented from draining out. Water is supplied under pressure to the upper portion (32) of the housing via inlet (14) and a sealing ring (36) allows a build-up of pressure in the upper portion (32), sufficient to overcome the force of a biasing spring (24), to cause the plunger (22) to move from its open to its closed position. When the water pressure in upper portion (32) of the housing is reduced, the spring (24) causes the plunger (22) to return to its open position. The valve (10) can be fitted to an evaporative cooler so as to automatically open and close when the cooler is switched OFF and ON respectively.
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patent: 4272052 (1981-06-01), Gidner
Neuwen David B.
West Christopher P.
Michalsky Gerald A.
Pollution Control Pty. Ltd.
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