초록 ▼

A fluid flow control valve and actuator therefor for changing fluid flow rate. A fluid flow control valve comprises a housing having a bore and an inlet and an outlet which form a flow passage through the housing. The valve also comprises a piston mounted in the bore, a fluid flow orifice communicat

A fluid flow control valve and actuator therefor for changing fluid flow rate. A fluid flow control valve comprises a housing having a bore and an inlet and an outlet which form a flow passage through the housing. The valve also comprises a piston mounted in the bore, a fluid flow orifice communicating with the inlet and the outlet, springs which bias the piston toward the inlet, and a valve seat which is matable with the piston and is slidable within the housing to vary fluid flow rate. An actuator for changing fluid flow rate of the valve is comprised of a housing having a bore, a piston dividing the bore into a first chamber and a second chamber, springs in the second chamber for biasing the piston toward the first chamber, an actuator fluid inlet communicating with the first chamber, and an actuator fluid outlet communicating with the first chamber. The valve seat at least partially projects into the actuator second chamber and the actuator piston is adapted to slide within the bore to contact the valve seat upon application of a predetermined pressure of actuator fluid into the first chamber to slide the valve seat within the valve housing to vary fluid flow rate.

대표청구항 ▼

[ I claim:] [1.] A fluid flow control valve comprising:a housing having a first bore and having an inlet and an outlet forming a flow passage through said housing;a first piston mounted in said first bore;a fluid flow orifice communicating with the inlet and the outlet;spring means biasing said firs

[ I claim:] [1.] A fluid flow control valve comprising:a housing having a first bore and having an inlet and an outlet forming a flow passage through said housing;a first piston mounted in said first bore;a fluid flow orifice communicating with the inlet and the outlet;spring means biasing said first piston toward the inlet;a valve seat matable with said first piston, said valve seat slidable within said housing to vary fluid flow rate; andan actuator for changing fluid flow rate comprising a housing having a second bore, a second piston dividing said second bore into a first chamber and a second chamber, spring means in said second chamber biasing said second piston toward said first chamber, an actuator fluid inlet communicating with said first chamber, an actuator fluid outlet communicating with said first chamber, said valve seat at least partially projecting into said second chamber, said second piston adapted to slide within said second bore to contact said valve seat upon application of a predetermined pressure of actuator fluid into said first chamber to slide said valve seat within said valve housing to vary fluid flow rate.