Flow control valve

Patent metadata

Field	Value
Publication number	US-9395013-B2
Application number	US-201113261469-A
Country	US
Kind code	B2
Filing date	Apr 11, 2011
Priority date	Apr 10, 2010
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

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.

First claim

The invention claimed is:

1. 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.

2. The electromagnetic two-way proportional control valve according to claim 1 wherein
said pressure detecting duct produces a permanent fluid-conducting connection between said fluid inlet and said pressure detecting chamber and axially penetrates said pressure detecting piston.

3. The electromagnetic two-way proportional control valve according to claim 1 wherein
said armature is axially displaceable by said proportional solenoid and acts permanently on said control piston via said pressure detecting piston as an intermediate member.

4. The electromagnetic two-way proportional control valve according to claim 1 wherein
said free front side of said pressure detecting piston comprises an end face facing said fluid inlet that is about one-fourth of an end face of said control piston facing in a direction of said fluid inlet.

5. The electromagnetic two-way proportional control valve according to claim 1 wherein
said pressure detecting piston is loosely connected to said control piston by a drive plate.

6. The electromagnetic two-way proportional control valve according to claim 5 wherein
said drive plate permits said control piston to move freely in an axial direction relative to the pressure detecting piston.

7. The electromagnetic two-way proportional control valve according to claim 1 wherein
said pressure detecting piston comprises a plurality of abrupt changes in outside diameter, with the outside diameter thereof in a direction adj acent said fluid inlet being the smallest thereof.

8. The electromagnetic two-way proportional control valve according to claim 1 wherein
said pressure detecting piston has a larger cross-sectional area in a direction of said proportional solenoid than in a direction of said control piston.

9. The electromagnetic two-way proportional control valve according to claim 1 wherein
said control piston is in a blocking position relative to said fluid-conducting connection in a non-energized state of said proportional solenoid.

10. The electromagnetic two-way proportional control valve according to claim 1 wherein
said control piston is in an open switching position relative to said fluid-conducting connection in a non-energized state of said proportional solenoid.

11. The electromagnetic two-way proportional control valve according to claim 1 wherein
a spring between said valve housing and said control piston biases said control piston against said pressure detecting piston.

12. 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.

13. The electromagnetic two-way proportional control valve according to claim 12 wherein
said inside diameter of said metering opening is about equal to a largest diameter of said pressure detecting piston.

14. The electromagnetic two-way proportional control valve according to claim 12 wherein
said control piston has a control surface facing said fluid inlet;
said pressure detecting piston has a control surface in said pressure detecting chamber; and
a difference in areas of said control surfaces introduces a force on said control piston and said pressure detecting piston relieving said armature.

15. 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

Assignees

• Ward Christopher
• Malone Peter
• Hydac Fluidtechnik Gmbh

Inventors

• Ward Christopher
• Malone Peter

Classifications

• F16K31/06

  using a magnet {, e.g. diaphragm valves, cutting off by means of a liquid} · CPC title

• F16K31/0668

  Sliding valves · CPC title

• F15B13/0402

  for linearly sliding valves, e.g. spool valves · CPC title

• F15B13/0442

  with proportional solenoid allowing stable intermediate positions · CPC title

• Y10T137/7761

  Electrically actuated valve · CPC title