Flow control valve
AssigneeHydac Fluidtechnik GmbH
InventorsChristopher Ward, Peter Malone
Life of this patent
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Abstract
An electromagnetic proportional 2-way flow control valve (1) has a valve housing (2) in which a control piston (3) is guided to be displaced axially. The control piston (3) actuates at least one fluid-conducting connection (4) between a fluid inlet (5) and an outflow opening (6). An armature (8) can be actuated by a proportional magnet and acts on the control piston (3). A pressure detecting piston (9) serves as the actuator part on the control piston (3). The fluid inlet (5) is connected in a fluid-conducting manner by a pressure detecting channel (11) to a pressure detecting chamber (12) such that the fluid pressure prevailing in the pressure detecting chamber (12) loads the pressure detecting piston (9) and the control piston (3) with a force (F) in the direction of relief of the armature.
Claims23
An electromagnetic two-way proportional flow control valve, comprising:
- a valve housing having a fluid inlet and an outflow opening;
- a control piston guided for axial displacement in said housing and actuating at least one fluid-conducting connection between said fluid inlet and said outflow opening;
- said control piston having a control surface facing said fluid inlet;
- an armature actuated by a proportional solenoid acting on said control piston;
- a pressure detecting piston being separable from and acting on an actuator part on said control piston and penetrating a guide plug in said valve housing, said guide plug forming a rigid and axially sliding bearing for said pressure detecting piston, said pressure detecting piston having a control surface;
- and
- a pressure detecting chamber in said valve housing connected in fluid communication with said fluid inlet via a pressure detecting duct conveying fluid pressure into said pressure detecting chamber to apply a force to said pressure detecting piston and said control piston relieving force on said armature, said pressure detecting piston penetrating said control piston to define a metering opening with a passage opening of said control piston in an area of a free front side of said pressure detecting piston, said control surface of said pressure detecting piston being in said pressure detecting chamber, a difference in areas of said control surfaces introducing a force on said control piston and said pressure detecting piston relieving said armature.
An electromagnetic two-way proportional control valve, comprising:
- a valve housing having a fluid inlet and an outflow opening;
- a control piston guided for axial displacement in said housing and actuating at least one fluid-conducting connection between said fluid inlet and said outflow opening;
- an armature actuated by a proportional solenoid acting on said control piston;
- a pressure detecting piston being separable from and acting on an actuator part on said control piston and penetrating a guide plug in said valve housing, said guide plug forming a rigid and axially sliding bearing for said pressure detecting piston;
- and
- a pressure detecting chamber in said valve housing connected in fluid communication with said fluid inlet via a pressure detecting duct conveying fluid pressure into said pressure detecting chamber to apply a force to said pressure detecting piston and said control piston relieving force on said armature, said pressure detecting piston penetrating said control piston to define a metering opening with a passage opening of said control piston in an area of a free front side of said pressure detecting piston,
- said control piston being a sliding piston and having said metering opening facing in a direction of said fluid inlet, said metering opening being penetrated by a free end of said free front side of said pressure detecting piston and having an inside diameter about twice as large as a diameter of said pressure detecting piston in an area of said metering opening.
The electromagnetic two-way proportional flow control valve, comprising:
- a valve housing having a fluid inlet and an outflow opening;
- a control piston guided for axial displacement in said housing and actuating at least one fluid-conducting connection between said fluid inlet and said outflow opening, said control piston having a control surface facing said fluid inlet;
- an armature actuated by a proportional solenoid acting on said control piston;
- a pressure detecting piston being separable from and acting on an actuator part on said control piston and penetrating a guide plug in said valve housing, said guide plug forming a rigid and axially sliding bearing for said pressure detecting piston, said pressure detecting piston having a control surface;
- and
- a pressure detecting chamber in said valve housing connected in fluid communication with said fluid inlet via a pressure detecting duct conveying fluid pressure into said pressure detecting chamber to apply a force to said pressure detecting piston and said control piston relieving force on said armature, said pressure detecting piston penetrating said control piston, said pressure detecting duct extending parallel to a longitudinal axis of said valve housing, said control surface of said pressure detecting piston being in said pressure detecting chamber, a difference in areas of said control surfaces introducing a force on said control piston and said pressure detecting piston relieving said armature;
- and
- a metering opening formed by a free lower opening cross section of said control piston.
Dependencies are inferred from the claim text.