EP0086632A2 - Soupape hydraulique - Google Patents

Soupape hydraulique Download PDF

Info

Publication number
EP0086632A2
EP0086632A2 EP83300678A EP83300678A EP0086632A2 EP 0086632 A2 EP0086632 A2 EP 0086632A2 EP 83300678 A EP83300678 A EP 83300678A EP 83300678 A EP83300678 A EP 83300678A EP 0086632 A2 EP0086632 A2 EP 0086632A2
Authority
EP
European Patent Office
Prior art keywords
closure member
cylinder
fluid
orifice
movement
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Withdrawn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
EP83300678A
Other languages
German (de)
English (en)
Other versions
EP0086632A3 (fr
Inventor
John Cusveller
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.)
Unisys Group Services Ltd
Original Assignee
Sperry 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 Sperry Ltd filed Critical Sperry Ltd
Publication of EP0086632A2 publication Critical patent/EP0086632A2/fr
Publication of EP0086632A3 publication Critical patent/EP0086632A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke

Definitions

  • This invention relates to valves for controlling fluid flow and is particularly although not exclusively applicable to controlling the operation of a piston-cylinder assembly. It will be convenient to hereinafter describe the invention with particular reference to controlling operation of a hydraulic-piston assembly.
  • a movable member such as a-piston-cylinder assembly
  • a valve according to the invention is characterized in that, when in use, it is initially influenced by the member which it controls to move from an open condition towards a closed condition, but final movement into the closed condition occurs independant of that member. That is, the valve is arranged to have a self-closing facility at the final stage of its closing movement and in that way it is freed from stresses imposed by the member which it controls, or at least those stresses will be reduced.
  • the self-closing facility is achieved by progressively throttling the passage of fluid through the valve so that a pressure differential is created such as to urge a closure member of the valve into a position such as to close the valve.
  • the example valve 1 shown in the drawings includes a body 2 having a cylindrical chamber 3 which slidably receives a closure member 4 and which has a valve orifice 5 at one end (figures 3 to 6).
  • the valve orifice 5 is of smaller diameter than the chamber 3 and is surrounded by a valve seat 6 against which the closure member 4 engages to prevent communication between the orifice 5 and the adjacent section 7 of the chamber 3.
  • the closure member 4 is in the form of a plunger having a head section 8 which divides the chamber 3 transversely into primary and secondary sections 7 and 9 which are respectively adjacent and remote from the valve orifice 5 and the respective volumes of chamber sections 7 and 9 varies according to the axial position of the plunger 4 within the chamber 3.
  • Two ports 10 and 11 are provided in the valve body 2 and are arranged to communicate with the primary chamber section 7.
  • the port 10 will be hereinafter called the load port and that port communicates with the primary section 7 through the valve orifice 5 as shown.
  • the other port 11 will be hereinafter called the transfer port and that port communicates with the primary section 7 at a location such as to be connectable with the load port 10 by way of the valve orifice 5.
  • Communication between the load port 10 and the secondary chamber section 9 may be effected by way of passage means provided through the plunger 4.
  • that passage means includes an axial bore 12 extending through the end of the plunger 4 adjacent to the valve orifice 5, and one or more lateral passages 13 connected to the bore 12 and exposed to the secondary chamber section 9 at a location behind the plunger head section 8.
  • the or each passage 13 may extend through the cylindrical surface of an axially extending rear end portion 14 of the plunger 4 which is of reduced diameter relative to the head section 8.
  • An annular space 15 is therefore provided between that end portion 14 and the surrounding surface of the chamber 3 and that space 15 forms part of the secondary chamber section 9.
  • a barrel section 16 of the plunger 4 may extend axially forwardly from the head section 8 towards the valve orifice 5 and has a diameter less than the head section 8.
  • the resulting annular space 17 between that barrel section 16 and the chamber wall constitutes part of the primary chamber section 7. It is preferred as shown, that the barrel section 16 is stepped to create an annular shoulder 18 which is engagable with the valve seat 6 to close the valve orifice 5 and that shoulder 18 may slope at an appropriate angle.
  • the resulting small diameter end portion 19 of the barrel section 16 is able to locate within the valve orifice 5 and will be hereinafter called the throttling portion of the plunger 4.
  • That throttling portion 19 preferably has a diameter only slightly smaller than that of the valve orifice 5 so there is relatively little clearance 20 between it and the orifice wall when it is located within the orifice 5 (figure 5).
  • the shoulder'18 is located relative to the head section 8 so that in the closed condition of the valve (figure 6) the transfer port 11 will communicate with the annular space 17 surrounding the barrel section 16.
  • Part of the plunger 4 or a member attached thereto preferably extends rearwardly out of the valve body 2 for engagement with a striker 21 as hereinafter described.
  • a pin 22 is secured to the rear end portion 14 of the plunger 4 and extends axially from the plunger 4 through an opening or bore 23 in the adjacent end of the valve body 2.
  • the pin 22 is secured to the plunger 4 for movement therewith and is slidably mounted in the bore 23.
  • Appropriate sealing means 24 may be provided between the pin 22 and the valve body 2. It is preferred that the diameter of the pin 22 is substantially the same as the diameter of the plunger bore 12.
  • Figure 1 shows an example fluid system including the control valve 1 as described above.
  • the load port 10 is connected by conduit 25 to the head end 26 of the cylinder 27 of a piston-cylinder assembly 28 to be controlled by the valve 1.
  • the head end 26 receives pressurized fluid from a circuit including a pump 29 in order to urge the piston 30 (figure 2) in a direction so as to extend the piston rod 31 out of the cylinder 27.
  • the transfer port 11 is connected by conduit 32 to a spool valve 33 or other device which is selectively operable to connect the port 11 to the pump 29 or drain 34 according to whether the assembly 28 is being extended or retracted.
  • valve l Assuming the assembly 28 is to be extended, before that operation commences the valve l will be in the closed condition as shown in figure 6 and the end face 34 of the plunger 4 located within the orifice 5 will be exposed to the fluid pressure in the head end 26 of the cylinder 27. The same pressure will also apply within the secondary chamber section 9 because of the connection provided by the bore 12 and passages 1.3. As a result, the head end pressure will act against rear end surfaces 35 and 36 of the plunger 4 which have a total area substantially equal to the cross sectional area of the chamber 3 less the cross sectional area of the plunger pin 22.
  • the spool valve 33 When it is desired to retract the piston rod 31 to the predetermined retracted position, the spool valve 33 is operated to adopt a position as shown in figure 7 at which the valve transfer port 11 is connected to the drain 34 so that fluid is able to escape from the cylinder head end 26 by way of the primary chamber section 7.
  • the striker 21 is adapted to respond to the consequent retracting movement of the piston rod 31 and is arranged to engage the exposed end of the plunger pin 22 as shown in figure 4, at an. appropriate position in the course of that movement.
  • the striker 21 is secured directly to the piston rod 31, but other arrangements are possible.
  • a stage is therefore reached at which the pressure within the primary chamber section 7 is so low that the fluid pressure generated force acting against the rear end surfaces 35 and 36 of the plunger 4 exceeds the force acting against the front end surfaces 34, 18 and 37. That force imbalance will operate to move the plunger 4 forwardly towards the valve seat 6 independant of the influence of the striker 21 and as a consequence the plunger pin 22 will be separated from the striker 21 (figure 5).
  • the valve 1 closes (figure 6) the cylinder piston 30 is naturally brought to a halt because fluid can no longer escape from the cylinder head end 26. At that position, a space 39 exists between the striker 21 and the plunger pin 22 so the plunger 4 is not subjected to stresses as might otherwise be imposed by the piston rod 31.
  • the striker 21 it is preferred to arrange the striker 21 so that, in the event of unintentional fluid leakage from the cylinder head end 26, it will engage the adjacent end of the cylinder 27 rather than the exposed end of the plunger pin 22. Also, the striker 21 may be arranged to slide along the piston rod 31 if the rod 31 is forced to retract further. Assuming the system is a hydraulic one, it is preferred to vent the head end 26 of the cylinder 27 to avoid formation of an air cushion which could be compressed to allow momentary engagement between the striker 21 and cylinder end when the valve 1 is closed.
  • the valve body 2 has a boss 40 formed thereon which has a passage 41 therethrough and opposite ends 42 and 43 of that passage 41 are adapted for connection to the spool valve 33 and the cylinder 27 respectively.
  • the cylinder connection is preferably a direct one and is. at the end portion 38 of the cylinder 27 remote from the head end 26 so the valve plunger pin 22 is arranged for engagement by the piston rod striker 21.
  • the spool valve connection may be direct also or by way of an appropriate conduit 44 as shown. In any event the passage 41 does not communicate with the valve chamber 3.
  • a valve according to the invention has the valuable advantage of automatically freeing itself from the influence of a member which initially causes it to close. That concept can be embodied in various valve forms and the valve is adaptable to a wide variety of applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Safety Valves (AREA)
  • Fluid-Damping Devices (AREA)
EP83300678A 1982-02-11 1983-02-10 Soupape hydraulique Withdrawn EP0086632A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2669/82 1982-02-11
AU266982 1982-02-11

Publications (2)

Publication Number Publication Date
EP0086632A2 true EP0086632A2 (fr) 1983-08-24
EP0086632A3 EP0086632A3 (fr) 1984-08-22

Family

ID=3693171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300678A Withdrawn EP0086632A3 (fr) 1982-02-11 1983-02-10 Soupape hydraulique

Country Status (3)

Country Link
EP (1) EP0086632A3 (fr)
JP (1) JPS58191389A (fr)
AU (1) AU1164083A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103994116B (zh) * 2014-04-17 2016-09-07 新魁液压技术有限公司 内置截止阀全行程可调油缸
CN113530920B (zh) * 2021-06-17 2024-05-28 北京中金泰达电液科技有限公司 一种液压缸行程限位结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252062A (fr) * 1959-11-20 1961-01-27 Circuit hydraulique à butée de fin de course par équilibre dynamique à fuite
FR2132013A1 (fr) * 1971-03-29 1972-11-17 Caterpillar Tractor Co
US3972265A (en) * 1973-08-02 1976-08-03 Bruning Company Stroke control device
CA1044571A (fr) * 1976-07-29 1978-12-19 Senegal, George Limiteur de course pour cylindres hydrauliques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252062A (fr) * 1959-11-20 1961-01-27 Circuit hydraulique à butée de fin de course par équilibre dynamique à fuite
FR2132013A1 (fr) * 1971-03-29 1972-11-17 Caterpillar Tractor Co
US3972265A (en) * 1973-08-02 1976-08-03 Bruning Company Stroke control device
CA1044571A (fr) * 1976-07-29 1978-12-19 Senegal, George Limiteur de course pour cylindres hydrauliques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HYDRAULICS AND PNEUMATICS, vol. 32, May 1979, pages 72-75, Cleveland, USA *

Also Published As

Publication number Publication date
JPS58191389A (ja) 1983-11-08
EP0086632A3 (fr) 1984-08-22
AU1164083A (en) 1983-08-18

Similar Documents

Publication Publication Date Title
KR100764119B1 (ko) 파일럿 포펫형 릴리프 밸브
US5174544A (en) Normally closed pilot operated bi-directional poppet valve
US5036877A (en) Pilot controlled pressure relief valve
CA2199926C (fr) Clapet de non-retour a cartouche
CZ105299A3 (cs) Hydraulicky nastavitelný zpětný ventil pro hydrauliku výstroje v hornických podzemních provozech
EP0227209B2 (fr) Clapets pilotes pour système hydraulique à deux étages
US8910659B2 (en) Hydraulic valve device
US5263679A (en) Valve with actuator
EP1218241B1 (fr) Systeme hydraulique pour train d'atterrissage d'avion
US4259986A (en) Control apparatus for a hydraulic power consumer
US5558004A (en) Control arrangement for at least one hydraulic consumer
US6276125B1 (en) Pressure balanced poppet valve
US4338856A (en) Dual pilot counterbalance valve
US4865079A (en) High pressure hydraulic flow control valve
EP0086632A2 (fr) Soupape hydraulique
US5778929A (en) Directional control valve assembly having a pressure compensation valve
CA1125626A (fr) Soupape de commande de traction
US4087073A (en) Safety valve with a hydraulic actuator
US3887160A (en) Fluid operated actuator for movable members
US4343328A (en) Flow sensing check valve
US5081902A (en) Apparatus for providing relief to a working chamber
US3500721A (en) Hydraulic control for two hydraulic motors
US3688644A (en) Fluid operated actuator for movable members
EP0157272B1 (fr) Système et valve de commande hydraulique
US3963045A (en) Cushion control accessory for pneumatic or hydraulic cylinders

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE DE FR GB IT SE

RHK1 Main classification (correction)

Ipc: F15B 15/24

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850423

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CUSVELLER, JOHN