Mit einem Magnetventil kombiniertes Expansionsventil

摘要

This invention provides an expansion valve combined with a solenoid valve which prevents a water hammer phenomenon from occurring when a refrigerant passage is opened and closed by the solenoid valve. Refrigerant passages (P1, P2) are formed in a valve body (1) between a primary port (1a) and a secondary port (1b). The solenoid valve (V) attached to the valve body (1) opens and closes the refrigerant passages (P1, P2) in their intermediate portion. An expansion valve disk (6) -- which is moved by the action of a diaphragm (8) that defines an outer pressure chamber (R2) communicating to a temperature sensing cylinder (E) and an inner pressure chamber (R1) --is brought into and out of engagement with a valve seat (S1) formed on the primary port (1a) side of the refrigerant passage (P1). The secondary port (1b) side and the inner pressure chamber (R1) are communicated via an inner pressure equalizing hole (15) formed in the valve body (1).