Patent ID: 6688319
Filing Date: 2004-02-10
Classification: F25B,G05D,Y10T

Abstract:
A fluid regulating control valve, comprising:a housing having an upstream region and a downstream region and having a control orifice formed therein adjacent the downstream region; a piston slidably disposed within the housing, the piston having a fluid passage defining an intermediate region disposed between the upstream region and the downstream region, the piston also having an edge adjacent the upstream region; an elastic member disposed within the housing for opposing translation of the piston within the housing; a throttling element adjacent the upstream region, the throttling element having a throttling surface adjacent the edge of the piston, the throttling surface and the edge defining a throttling orifice therebetween; and an equalization aperture formed in the housing to allow a fluid in the downstream region to enter an equalization chamber defined by a region between an inside surface of the housing and an outside surface of the piston.