Patent attributes
A valve apparatus includes a valve main body provided with a first inlet and outlet, a valve chamber to which a valve port is open, and a second inlet and outlet connected to the valve port. A valve shaft having a valve body portion for opening and closing the valve port is provided in the valve chamber. A relief valve is provided within the valve body portion to relieve a pressure of the valve chamber to the second inlet and outlet when a fluid pressure of the refrigerant within the valve chamber becomes a predetermined pressure or more in a fully closed state in which the valve port is closed by the valve body portion, thereby to automatically relieve a fluid within a valve chamber without causing a cost increase and an enlargement of size.
