PRESSURE REGULATOR WITH INGRATED REVERSE PRESSURE EXHAUST
摘要
<p>A control valve system is disclosed which provides a mechanism by which the valve can be moved to its fail-safe position. The system includes a valve actuator (28) which receives pressurized fluid from a regulator (42). The regulator is provided with a reverse pressure exhaust valve (76) such that if pressure within the valve actuator is to be alleviated, as when the valve is to be positioned into its fail-safe position, the reverse pressure exhaust valve (76) is opened thereby providing an immediate and accurate passageway through which excess pressure within the regulator outlet can be alleviated.</p>
