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EP0132923A2 - Soupape pour diriger automatiquement un courant de fluide - Google Patents

Soupape pour diriger automatiquement un courant de fluide Download PDF

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Publication number
EP0132923A2
EP0132923A2 EP84303536A EP84303536A EP0132923A2 EP 0132923 A2 EP0132923 A2 EP 0132923A2 EP 84303536 A EP84303536 A EP 84303536A EP 84303536 A EP84303536 A EP 84303536A EP 0132923 A2 EP0132923 A2 EP 0132923A2
Authority
EP
European Patent Office
Prior art keywords
valve
spool
fluid
return
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84303536A
Other languages
German (de)
English (en)
Other versions
EP0132923A3 (fr
Inventor
Stephan Kempe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JH Fenner and Co Ltd
Original Assignee
JH Fenner and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JH Fenner and Co Ltd filed Critical JH Fenner and Co Ltd
Publication of EP0132923A2 publication Critical patent/EP0132923A2/fr
Publication of EP0132923A3 publication Critical patent/EP0132923A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven

Definitions

  • the present invention relates to a valve for automatically directing the flow of fluid from a power pack to each side in turn of a double acting hydraulic actuator causing it to reciprocate.
  • a valve of this type is useful in, for example, such applications as hydraulic barn cleaners, bilge pumps and certain types of pipe bending equipment.
  • a valve assembly comprising a valve body having therein a valve spool whose position controls the flow of fluid from a source to one side or the other of a double acting hydraulic actuator, and spring loaded valve means controlling the flow of fluid from a line downstream of the valve spool to a pilot spool to actuate same when a predetermined pressure is exceeded in said line to displace the valve spool against the force of a return spring and change over the position of the valve spool and commence-the return stroke of the actuator, the valve spool being held in its changed over position displaced against the force of the return spring by a back pressure acting on the valve spool during the return stroke of the hydraulic actuator.
  • the back pressure is generated by providing a restrictor or throttle which restricts the flow of fluid from the actuator on the return stroke.
  • a restrictor or throttle which restricts the flow of fluid from the actuator on the return stroke.
  • the spring load valve means is set to actuate the pilot spool at a pressure which is slightly below the setting of a relief valve for the system.
  • the actuator reaches its end position, or is stopped by other resistance, the pressure rises in said line so overcoming the resistance of the valve means and actuating the pilot spool.
  • the line branches off a passageway leading to one side of the actuator.
  • the actuator is typically an hydraulic cylinder/piston assembly.
  • a control system for an hydraulic actuator in the form of a double acting cylinder/piston assembly 20/ 21, has a pump 1 for feeding,hydraulic fluid to the actuator and return channels 3 leading to a reservoir 4.
  • a relief valve 2 is provided for controlling the maximum pressure delivered by the pumps to the system.
  • a valve assembly controls the flow of fluid from the source to the actuator.
  • the valve assembly has a valve body 11 accommodating slidably therein a valve spool 12.
  • the valve spool 12 is biased into an end position by a return spring 13 in which position communication is established between the source of pressure and a chamber A of the cylinder 20. In this position a chamber B of the cylinder is in communication with the return channel 3.
  • Two lines 16 lead from respective outlets in the valve body to the chambers A and B.
  • a line 23 branches from the line leading to chamber A and has disposed therein valve means comprising a ball 17 which is urged into contact with a valve seat by a spring 25.
  • the valve means is set to open at a pressure slightly below that of the relief valve 2.
  • a pilot spool 14 is disposed in the line 23 and is co-operable with one end of the valve spool 12.
  • Figure 1 shows the valve spool in its starting position wherein fluid from the source is directed to chamber A to displace the piston rod 21 to the left, as illustrated.
  • the piston rod reaches its end position, as illustrated in figure 2, no further movement can occur, and there is a buildup in pressure in the chamber A until the pressure overcomes the force of the spring 25 when fluid passes down the line 23 and acts on one end of the pilot spool 14.
  • This causes the valve spool 12 to be displaced against the force of the return spring 13 and thereby changes over the position of the valve spool so that fluid from the source is in communication with chamber B, and chamber A is in communication with the return channel.3.
  • the piston rod 21 commences its return stroke - see figure 3.
  • a throttle or restriction D is provided in the passage leading to the reservoir between an end face of the pilot valve 14 and an adjacent end of the valve spool 12.
  • the valve spool has an orifice 27 therein by way of which the fluid has to pass on its return to the reservoir.
  • the restriction to return flow of the fluid generates a back pressure which acts on the valve spool 12 in a direction against the return spring 13.
  • the valve spool is maintained in its changed over position so long as the back pressure acting on the valve spool is greater than the spring force.
  • a radial hole 28 (or several such holes) in the spool provides relief of any pressure trapped in the end compartment 27 of the spool 12 during return shifting.
  • the hole is sized so that the pressure drop through it is far greater than the pressure required to keep the spool in the shifted position against the spring.
  • the pilot valve is restricted in its return to its starting position in which position a flange or circlip 15 on the pilot spool engages the valve body, by virtue of the fact that the valve means, i.e. ball 17, closes off the line 23 so that fluid can only escape from this line by leakage past the pilot spool.
  • the valve means i.e. ball 17
  • valve will automatically change over so that the stroke of the actuator is reversed. The cycle will then continue. This occurs because the resistance causes either a build up of pressure in chamber A so triggering the valve means or termination of the back pressure as a result of movement of the piston rod being obstructed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)
  • Multiple-Way Valves (AREA)
EP84303536A 1983-05-31 1984-05-25 Soupape pour diriger automatiquement un courant de fluide Withdrawn EP0132923A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8314942 1983-05-31
GB838314942A GB8314942D0 (en) 1983-05-31 1983-05-31 Valves

Publications (2)

Publication Number Publication Date
EP0132923A2 true EP0132923A2 (fr) 1985-02-13
EP0132923A3 EP0132923A3 (fr) 1987-03-25

Family

ID=10543601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303536A Withdrawn EP0132923A3 (fr) 1983-05-31 1984-05-25 Soupape pour diriger automatiquement un courant de fluide

Country Status (3)

Country Link
EP (1) EP0132923A3 (fr)
JP (1) JPS608504A (fr)
GB (1) GB8314942D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6605019B1 (en) 1999-04-19 2003-08-12 Zf Friedrichshafen Ag Switching device of a two-stage planetary gear
WO2012074678A3 (fr) * 2010-12-02 2012-08-16 Halliburton Energy Services, Inc. Dispositif pour diriger l'écoulement d'un fluide à l'aide d'un manostat

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5457769B2 (ja) * 2009-09-10 2014-04-02 大和基工株式会社 １流路型油圧シリンダ駆動式拡大ヘッド
JP4749496B1 (ja) * 2010-05-26 2011-08-17 ハウスプラン株式会社 シーソー式太陽光発電装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785392A (en) * 1971-10-21 1974-01-15 Eaton Corp Flow control valve
US3977664A (en) * 1975-03-25 1976-08-31 Affiliated Hospital Products, Inc. Hydraulic control valve arrangement for operating tables and the like
US4132071A (en) * 1977-10-11 1979-01-02 Hills-Mccanna Company Electro-hydraulic controlled valve actuator system
DE2837666A1 (de) * 1978-08-29 1980-03-06 Inter Hydraulik Gmbh Fuell- und auslassventil zur steuerung des hydraulikflusses, insbesondere bei pressen, abkantpressen und scheren
US4349041A (en) * 1979-08-20 1982-09-14 Nl Industries, Inc. Control valve system for blowout preventers
GB2092717B (en) * 1981-02-07 1984-10-17 Gewerk Eisenhuette Westfalia Hydraulic control valve assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6605019B1 (en) 1999-04-19 2003-08-12 Zf Friedrichshafen Ag Switching device of a two-stage planetary gear
WO2012074678A3 (fr) * 2010-12-02 2012-08-16 Halliburton Energy Services, Inc. Dispositif pour diriger l'écoulement d'un fluide à l'aide d'un manostat
US8387662B2 (en) 2010-12-02 2013-03-05 Halliburton Energy Services, Inc. Device for directing the flow of a fluid using a pressure switch

Also Published As

Publication number Publication date
JPS608504A (ja) 1985-01-17
GB8314942D0 (en) 1983-07-06
EP0132923A3 (fr) 1987-03-25

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Withdrawal date: 19871020

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Inventor name: KEMPE, STEPHAN