Patent ID: 6530528
Filing Date: 2003-03-11
Classification: F16K,F25B,G05D,Y02B

Abstract:
In combination a refrigerant expansion valve with an integral electrically operated inlet shut-off valve comprising:(a) a valve body having an inlet, adapted for connection to a source of pressurized liquid refrigerant, an outlet and an expansion valve member moveably disposed with body for controlling flow to the outlet; (b) an actuating member disposed in said valve body, adapted for connection to a thermally responsive actuator, and operative for effecting movement of the expansion valve member; (c) a shut-off valve seat disposed in the flow path between the inlet and the expansion valve member including a shut-off valve member moveable with respect thereto between a first position permitting a flow to the expansion valve member and a second position blocking flow to the expansion valve member; and, (d) a solenoid actuator attached to the valve body and having an armature moveable in a fluid pressure sealed armature guide and operable for, upon energization, effecting movement of the shutoff valve member between said first and second positions said armature having a cross port therein for alleviating any reduced fluid pressure, formed on an end of said armature remote from the shut-off valve seat, and acting between the armature and armature guide.