초록 ▼

A system is utilized for controlling the flow of process fluid between an input port and an output port of a valve. A first mechanism controls the modulation of the valve and a second mechanism controls the positive shutoff. An electrical system is responsible for modulation adjustments and a pneuma

A system is utilized for controlling the flow of process fluid between an input port and an output port of a valve. A first mechanism controls the modulation of the valve and a second mechanism controls the positive shutoff. An electrical system is responsible for modulation adjustments and a pneumatic system is responsible for positive shutoff control. A third, hydraulic, system is responsible for equalizing the pressure of the process fluid within the valve.

대표청구항 ▼

A method for controlling the flow of process fluid between an input port and an output port with a valve positioned between said input port and said output port, comprising operating said valve with a first actuating mechanism to cause said process fluid to flow between said input port and said outp

A method for controlling the flow of process fluid between an input port and an output port with a valve positioned between said input port and said output port, comprising operating said valve with a first actuating mechanism to cause said process fluid to flow between said input port and said output port at a predetermined rate, engaging said valve with a second actuating mechanism to close said valve and substantially shut off process fluid flow between said input port and said output port, and selectively disengaging said second actuating mechanism from said valve to permit said first actuating mechanism to operate said valve.