초록 ▼

To provide pressure regulation, limit pressure rise rate and control the speed of a fluid operated system with a control valve, a pilot operated valve member is in communication with a fluid passageway on both the inlet and outlet sides of a butterfly valve. The pilot operated valve member is also i

To provide pressure regulation, limit pressure rise rate and control the speed of a fluid operated system with a control valve, a pilot operated valve member is in communication with a fluid passageway on both the inlet and outlet sides of a butterfly valve. The pilot operated valve member is also in communication with an actuator operable to move the butterfly valve between a closed position and an open position dependent upon fluid pressure on the inlet side and outlet side of the butterfly valve. By utilizing fluid pressure signals delivered to three separate chambers, the pilot operated valve member is capable of controlling valve opening ramp rate, pressure variations within the limit of a set point, and adjustability of the set point.

대표청구항 ▼

A control valve for supplying a fluid under pressure to a fluid operated system, comprising: a fluid passageway including an inlet communicating with a source of said fluid and an outlet communicating with said system; valve means disposed in said fluid passageway between said inlet and outlet, said

A control valve for supplying a fluid under pressure to a fluid operated system, comprising: a fluid passageway including an inlet communicating with a source of said fluid and an outlet communicating with said system; valve means disposed in said fluid passageway between said inlet and outlet, said valve means being movable between open and closed positions, said valve means being in a closed position prior to start-up of said system; a pilot operated valve member responsive to fluid pressure on said inlet and outlet sides of said valve means; and actuator means adapted for communication with said fluid passageway on said inlet side of said valve means through said pilot operated valve member, said actuator means being operable to move said valve means between said closed position and said open position, said actuator means moving said valve means dependent upon said fluid pressure on said inlet and outlet sides of said valve means; said pilot operated valve member including means for limiting the rate of increase in fluid pressure toward an operating pressue on said outlet side of said valve means during start-up of said system, means for adjusting said pressure on said outlet side of said valve means to change the speed of said system during operation thereof, and means for limiting said fluid pressure on said outlet side of said valve means to said operating pressure during operation of said system; said pilot operated valve member including an axially movable poppet, said fluid pressure on said inlet side of said valve means biasing said poppet from a closed position to an open position, said pilot operated valve member also including a diaphragm assembly axially spaced from said poppet; said diaphragm assembly including at least one chamber in communication with said fluid pressure on said outlet side of said valve means, said chamber being arranged such that said fluid pressure on said outlet side of said valve means biases said poppet toward said closed position, said diaphragm assembly and chamber comprising at least a portion of said pressure limiting means.