REGULATING VALVE DEVICE

摘要

Provided is a regulating valve device which opens/closes a valve element by a working fluid. A valve element (310) has a structure in which a valve element head portion (310a) and a valve element body portion (310b) are coupled by a valve stem (310c). The valve element (310) and a power transmission member (320a) are slidably housed in a valve casing (305). A first bellows (320b) forms a first space (Us) in a position on the side opposite to the valve element with respect to the power transmission member (320a) by being fixed to the power transmission member (320a) and the valve casing (305). A second bellows (320c) forms a second space (Ls) in a position on the valve element side with respect to the power transmission member (320a) by being fixed to the power transmission member (320a) and the valve casing (305). Power is transmitted from the power transmission member (320a) to the valve element head portion (310a) according to the ratio between air supplied from a first pipe (320d) to the first space (Us) and air supplied from a second pipe (320e) to the second space (Ls), thereby opening/closing a transfer path (200a).