Pressure-controlled 2-way flow control valve for hydraulic applications and valve assembly comprising such a 2-way flow control valve

Patent metadata

Field	Value
Publication number	US-10550862-B2
Application number	US-201615152668-A
Country	US
Kind code	B2
Filing date	May 12, 2016
Priority date	May 12, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

The present disclosure provides, in a first aspect, a pressure-controlled 2-way flow control valve for hydraulic applications, wherein the 2-way flow control valve has applied thereto a first pressure signal in the closing direction of the 2-way flow control valve by means of a first output-side tapping and a second pressure signal in the opening direction by means of an LS pressure reporting duct. A pressure signal corrupting the first or second pressure signal is applied to the 2-way flow control valve in the closing or opening direction by means of a second tapping which is effective at least over part of the control stroke of the 2-way flow control valve.

First claim

What is claimed is:

1. A valve assembly for a hydraulic application, the valve assembly comprising:
a proportional directional spool valve for controlling a hydraulic consumer; and
a pressure-controlled 2-way flow control valve comprising:
a first output-side tapping for applying a first pressure signal in a closing direction of the 2-way flow control valve;
a control connection for receiving a second pressure signal in an opening direction of the 2-way flow control valve from an LS pressure signaling duct; and
a second tapping for applying a pressure signal for corrupting the first pressure signal or the second pressure signal in the closing direction or the opening direction which is effective at least over a portion of a control stroke of the 2-way flow control valve;

wherein the 2-way flow control valve is connected to the proportional directional spool valve on an output side of the 2-way flow control valve or on an input side of the 2-way flow control valve.

2. The valve assembly according to claim 1 wherein the 2-way flow control valve is configured such that the corrupting pressure signal is able to be applied only over a part of the control stroke of the 2-way flow control valve.

3. The valve assembly according to claim 1 further comprising one of a first nozzle and a first orifice via which the corrupting pressure signal may be applied to the 2-way flow control valve in the closing direction or the opening direction in a part of the control stroke tapping the corrupting pressure signal.

4. The valve assembly according to claim 3 further comprising one of a second nozzle and a second orifice connected in series with the one of the first nozzle and the first orifice, the corrupting pressure signal being applicable to the 2-way flow control valve via a control connection arranged between 1) the one of the second nozzle and the second orifice and 2) the one of the first nozzle and the first orifice.

5. The valve assembly according to claim 1 wherein the second tapping is arranged on the input side of the 2-way flow control valve.

6. The valve assembly according to claim 5 wherein the corrupting pressure signal is appliable in the opening direction, so that, when the difference between the first pressure signal and the second pressure signal increases, an increasing volumetric flow is established on the output side of the 2-way flow control valve.

7. The valve assembly according to claim 1 wherein the second tapping is arranged on the output side of the 2-way flow control valve and the corrupting pressure signal is appliable in the opening direction.

8. The valve assembly according to claim 7 wherein the control stroke comprises a flow-through section and a shut-off section, in which no volumetric flow is able to occur on the output side of the 2-way flow control valve, the corrupting pressure signal being, in the flow-through section, appliable to the 2-way flow control valve over a portion of the control stroke.

9. The valve assembly according to claim 5 wherein the corrupting pressure signal is appliable in the closing direction, so that, when the difference between the first pressure signal and the second pressure signal increases, a decreasing volumetric flow is established on the output side of the 2-way flow control valve.

10. The valve assembly according to claim 1 wherein the 2-way flow control valve is configured such that the corrupting pressure signal is blockable over a portion of the control stroke.

11. The valve assembly according to claim 1
wherein the 2-way flow control valve is connected to the proportional directional spool valve on the output side of the 2-way flow control valve.

12. The valve assembly according to claim 11 further comprising a valve block in which the proportional directional spool valve is integrated together with the 2-way flow control valve.

13. The valve assembly according to claim 1
wherein the 2-way flow control valve is connected to the proportional directional spool valve on the input side of the 2-way flow control valve.

14. The valve assembly according to claim 13 further comprising a valve block in which the proportional directional spool valve is integrated together with the 2-way flow control valve.

15. A valve arrangement for hydraulic applications, the arrangement comprising:
a pressure-controlled 2-way flow control valve;
a first output-side tapping for applying a first pressure signal in a closing direction of the 2-way flow control valve;
an LS pressure signaling duct for applying a second pressure signal in an opening direction of the 2-way flow control valve;
a second tapping for applying a pressure signal for corrupting the first pressure signal or the second pressure signal in the closing direction or the opening direction which is effective at least over a portion of a control stroke of the 2-way flow control valve; and
a proportional directional spool valve for controlling a hydraulic consumer;
wherein the 2-way flow control valve is connected to the proportional directional spool valve on an output side of the 2-way flow control valve or on an input side of the 2-way flow control valve.

16. The valve arrangement according to claim 15 wherein the 2-way flow control valve is connected to the proportional directional spool valve on the output side of the 2-way flow control valve.

17. The valve arrangement according to claim 16 further comprising a valve block in which the proportional directional spool valve is integrated together with the 2-way flow control valve.

18. The valve arrangement according to claim 15 wherein the 2-way flow control valve is connected to the proportional directional spool valve on the input side of the 2-way flow control valve.

19. The valve arrangement according to claim 18 further comprising a valve block in which the proportional directional spool valve is integrated together with the 2-way flow control valve.

20. A pressure-controlled 2-way flow control valve for hydraulic applications, the pressure-controlled 2-way flow control valve comprising:
a first output-side tapping for applying a first pressure signal in a closing direction of the 2-way flow control valve;
a control connection for receiving a second pressure signal in an opening direction of the 2-way flow control valve from an LS pressure signaling duct; and
a second tapping for applying a pressure signal for corrupting the first pressure signal or the second pressure signal in the closing direction or the opening direction which is effective at least over a portion of a control stroke of the 2-way flow control valve;
wherein the 2-way flow control valve is configured so that the corrupting pressure signal is blockable over a portion of the control stroke, and wherein the first and second tappings are arranged on opposite sides of a body of the 2-way flow control valve.

Assignees

• Hawe Hydraulik Se

Inventors

• Wechsel Thomas
• Heusser Martin

Classifications

• F15B2211/50572

  using a pressure compensating valve for controlling the pressure difference across a flow control valve · CPC title

• F15B2211/30535

  the pressure compensating valve is arranged between pressure source and directional control valve · CPC title

• F15B2211/5756

  for opening a valve · CPC title

• F15B13/0402

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

• F15B2211/5753

  for closing a valve · CPC title