초록 ▼

A refrigerant expansion valve for an air conditioning system is combined with a solenoid-actuated closure device in a common housing. The housing provides for placement of the solenoid valve in a position to shut off fluid flow across the expansion device, with a plunger being placed to come into se

A refrigerant expansion valve for an air conditioning system is combined with a solenoid-actuated closure device in a common housing. The housing provides for placement of the solenoid valve in a position to shut off fluid flow across the expansion device, with a plunger being placed to come into sealing contact with a piston bore of the expander or with a sealing surface defined in the housing proximate to the piston. Shutting off flow across the expander prevents loss of pressure differential during "off" portions of an operating cycle, thus providing a saving of energy costs.

대표청구항 ▼

[ What is claimed is:] [1.]1. A valve assembly comprising a piston-orifice expansion valve, a solenoid-actuated closure valve and a common housing enclosing both of said valves, said housing comprising:a first, forward housing wall portion having defined therein a generally cylindrical piston-receiv

[ What is claimed is:] [1.]1. A valve assembly comprising a piston-orifice expansion valve, a solenoid-actuated closure valve and a common housing enclosing both of said valves, said housing comprising:a first, forward housing wall portion having defined therein a generally cylindrical piston-receiving chamber including a forward end and a rearward end, said forward end having at least one exit port and a first sealing surface adapted to come into contact with a mating surface of a piston disposed in said chamber so as to restrict forward flow of fluid past said piston to flow through an axial bore therethrough, and said rearward end of said forward housing portion including a stop member limiting rearward movement of said piston;a second, intermediate housing wall portion connected to said rearward end of first portion and defining a fluid passageway communicating with said piston bore, said second portion further including a fluid entry port and an opening disposed to receive a solenoid-actuated plunger aligned for movement into engagement of an end of the plunger with a second sealing surface inside the housing; anda third housing portion connected to said second portion and supporting therein a said solenoid-actuated plunger adapted to come into contact with a said second sealing surface, whereby fluid flow across said housing may be shut off.