초록 ▼

A fluid flow control valve, comprising: a housing having an inlet connectable to a source of pressurized fluid, an outlet connected to the inlet via a connecting passageway, and a valve opening in the connecting passageway; a valve member movable to an open position and to a closed position with res

A fluid flow control valve, comprising: a housing having an inlet connectable to a source of pressurized fluid, an outlet connected to the inlet via a connecting passageway, and a valve opening in the connecting passageway; a valve member movable to an open position and to a closed position with respect to the valve opening; and an actuator for actuating the valve member to its open and closed positions; the actuator including a control chamber which is expansible by receiving a quantity of fluid from the housing inlet and which is contracted by discharging the quantity of fluid from the housing via the housing outlet, whereby repeated operations of the valve repeatedly flush the control chamber with fresh fluid from the source of pressurized fluid.

대표청구항 ▼

[ I claim:] [1.] A fluid flow control valve, comprising:a housing having an inlet connectible to a source of pressurized fluid, an outlet connected to said inlet via a connecting passageway, and a valve opening in said connecting passageway;a valve member movable to an open position and to a closed

[ I claim:] [1.] A fluid flow control valve, comprising:a housing having an inlet connectible to a source of pressurized fluid, an outlet connected to said inlet via a connecting passageway, and a valve opening in said connecting passageway;a valve member movable to an open position and to a closed position with respect to said valve opening;a spring normally urging said valve member to its closed position with respect to said valve opening;and an actuator for actuating said valve member to its open and closed positions; said actuator including;a valve stem fixed at one end to said valve member and formed with a passageway therethrough leading to its opposite end;a cylinder having an end wall at said opposite end of the stem;a piston displaceable along said stem to positions adjacent to and remote from said cylinder end wall to define therewith an expansible-contractible control chamber;said valve stem passing through said valve opening and into said control chamber such that one end of the passageway through the valve stem leads to said housing inlet, and the opposite end of the passageway through the valve stem leads into said control chamber;and a restrictor within said passageway in the stem for restricting the fluid flow between said inlet and said control chamber;said control chamber being expansible, when the valve member is in its closed position, by receiving a quantity of fluid from the housing inlet via said stem passageway to move said valve member to its open position, and being contractible to return the fluid to the housing inlet via said valve stem passageway and said restrictor when said valve member has been moved to its open position to discharge a quantity of fluid from the housing inlet via said housing outlet, such that repeated operations of said valve repeatedly flush substantially the complete volume of said control chamber, as well as said valve stem passageway and said restrictor, with fresh fluid from said source of pressurized fluid.