EP0829794A1 - Soupape de siège de réduction de pression - Google Patents

Soupape de siège de réduction de pression Download PDF

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Publication number
EP0829794A1
EP0829794A1 EP97107824A EP97107824A EP0829794A1 EP 0829794 A1 EP0829794 A1 EP 0829794A1 EP 97107824 A EP97107824 A EP 97107824A EP 97107824 A EP97107824 A EP 97107824A EP 0829794 A1 EP0829794 A1 EP 0829794A1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
control piston
pressure reducing
valve according
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.)
Granted
Application number
EP97107824A
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German (de)
English (en)
Other versions
EP0829794B1 (fr
Inventor
Anton Estendorfer
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.)
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Original Assignee
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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Filing date
Publication date
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Publication of EP0829794A1 publication Critical patent/EP0829794A1/fr
Application granted granted Critical
Publication of EP0829794B1 publication Critical patent/EP0829794B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves

Definitions

  • the invention relates to a pressure reducing seat valve of the type specified in the preamble of claim 1.
  • Pressure reducing valves in which the reduced pressure acts on the closing element against the spring and in the opening direction, are used in high-pressure hydraulics for a large number of applications.
  • a pressure reducing valve in clamping devices of machine tools is used to set the clamping pressure, which is lower than the inlet pressure and can possibly only be approximately 10% of the inlet pressure.
  • Pressure tightness in the closed position is essential for a pressure reducing valve in many applications. This pressure tightness is a main advantage of pressure reducing seat valves compared to leakage-type pressure reducing slide valves, which require an additional solenoid or check valve for pressure tightness in the closed position.
  • a slide valve with an orifice function and a hydraulic damping device is known.
  • the damping device works with pressure medium which flows from the pump side via a throttle into a spring chamber and from there via throttle openings to the tank in order to act on the control piston and the orifice slide connected in one piece with it.
  • valves of the prior art are of a different type, since the closing element is acted upon by the input or pump pressure in the opening direction away from the valve seat and against the spring, while the lower pressure downstream of the seat acts on the closing element in the closing direction.
  • the invention has for its object to provide a pressure reducing seat valve of the type mentioned that works largely silently and over a long service life.
  • the control spring lifts the closing element from the seat against the reduced pressure on the control piston via the control piston.
  • the reduced pressure together with the closing element acted upon by the inlet pressure in the closing direction, returns the control piston to the valve seat as soon as the reduced pressure corresponds to the set value.
  • the closing element is raised far from the valve seat in order to keep the reduced pressure at the set height as quickly as possible. Since usually only a small amount of pressure medium is required to restore the reduced pressure, the control piston is then quickly pushed back against the control spring, so that there is a fear that the closing element will hit the valve seat firmly under the input pressure.
  • the hydraulic damping device first attacks the control piston, which controls the movement of the closing element and suppresses rapid play movements of the control piston, especially in the closing direction of the closing element. There is no fear of rattling of the closing element even when the pressure drops suddenly. This suppresses disturbing noise and the pressure-reducing seat valve remains functionally reliable over a long service life.
  • the closing element guided by the control piston, approaches the valve seat in order to set the reduced pressure or to shut it off when the reduced pressure is reached, without oscillating and beating repeatedly. Only hydraulically damping the closing movement of the control piston has the advantage of a rapid opening movement of the closing element in order to initiate the pressure adjustment without delay if the reduced pressure drops.
  • the pressure medium must pass through the throttled flow path during this engagement to act on the control piston against the control spring, thereby preventing the control piston and consequently the closing element from closing too quickly.
  • the damping effect can be predetermined by the narrowness of the flow path. If, in order to also dampen the opening movement hydraulically, the displacement element is provided in the storage chamber, then pressure medium contained in the storage chamber is used in the Opening movement pressed through the restricted flow path.
  • the hydraulic damping device works in the manner of a hydraulic shock absorber integrated in the pressure reducing seat valve. It is favorable that the damping device is easily integrated into the special, proven seat valve concept, in which the inlet or pump pressure acts on the seat closing element in the closing direction and, against the spring, the reduced pressure acts against the spring and on the closing element in the opening direction.
  • the piston which can be adjusted with the control piston and which simultaneously limits the throttled flow path serves as the displacement element.
  • the piston is loaded on both sides by the reduced pressure, so the control characteristics of the pressure reducing seat valve are not noticeably affected in this regard.
  • the storage chamber has a double function, since it receives the pressure medium pressed through the throttled flow path and serves to act on the control piston against the control spring.
  • the piston forming the displacement element of the hydraulic damping device has the additional function of a stroke limitation of the control piston, so that it is not displaceably displaced into the spring chamber.
  • the throttled flow path is bypassed by a check valve which opens in the flow direction to the storage chamber and blocks in the opposite direction.
  • the check valve is arranged to save space in the piston.
  • the diameter of the piston is larger than the diameter of the control piston.
  • the embodiment according to claim 9 is technically simple.
  • the pressure medium for damping (in the closing direction or in the closing and opening direction of the control piston) must flow through at least one channel running in the housing.
  • the plunger is designed as a flow-guiding trumpet.
  • the pressure medium coming out of the valve seat is not only guided (without disturbing turbulence) to the side of the reduced pressure, but also to the throttled flow path, whereby the damping is evened out.
  • the flow guide trumpet is part of the hydraulic damping device, because the restricted flow path and the storage chamber when damping, e.g. would be overwhelmed due to the flow dynamics.
  • the embodiment according to claim 12 is favorable. With this course, optimal support of the hydraulic damping device is achieved.
  • the pressure reducing seat valve can be easily converted to different working pressure ranges without having to change the expensive control spring and the housing.
  • a pressure reducing seat valve D according to FIG. 1 has a stepped bore 1 in a block-shaped connection housing G (which may be the housing of a consumer), in which an insert 2 with a valve seat S is positioned.
  • a screw-in housing insert 3 which is secured by a locking and sealing nut 4, is used to position the insert 2.
  • a control piston R is displaceable in an axial bore 9.
  • a control spring F is provided in a spring chamber 19 vented to the atmosphere. The biasing force of the control spring F can be adjusted by conventional devices (not shown).
  • the housing insert 3 forms a module unit with its components and can be exchanged for other housing inserts 3 with the same external dimensions, but with differently dimensioned control pistons R while using the control spring F and the housing, in order to easily adapt the pressure reducing seat valve D to different working pressure ranges.
  • the valve seat S is located between a port P for the inlet or pump pressure and a port A for the reduced pressure.
  • the valve seat S On the side of the connection P, the valve seat S has a closing element E, e.g. a hardened steel ball associated with hardened valve seat S, which is supported and guided in a holding part 5, which is displaceably guided in a screw insert 6 under the force of a weak closing spring 7.
  • the screw insert 6 is screwed to the insert 2 and supports a filter arrangement 8.
  • the control piston R is integrally connected to a larger piston K and a plunger 12.
  • the piston K delimits a storage chamber 13 in which the control piston R can be acted upon by the reduced pressure against the force of the control spring F and in the opening direction.
  • the piston K delimits a restricted flow path 14 to the storage chamber 13 with its outer circumference and acts, for example, as a stroke stop for the control piston R in the direction of the shoulder 15.
  • the piston K forms, together with the throttled flow path 14 and the storage chamber 13, a hydraulic damping device B for the control piston R, which adjusts the closing element E during opening and closing movements.
  • connection A In the illustrated position of the pressure reducing seat valve D, the desired pressure set at the control spring F is present in connection A.
  • This reduced pressure acts on the control piston R against the control spring F, the closing element E being held in tight contact on the seat S by the inlet pressure prevailing in the port P.
  • the reduced pressure also prevails in the storage chamber 13. Sinks, for example due to Consumption, the reduced pressure, then the control spring F overcomes the counterforce of the control piston R and lifts the closing element E from the valve seat S.
  • pressure medium is sucked into the storage chamber 13 via the throttled flow path 14, as a result of which the opening movement is damped.
  • the plunger 12 for guiding the closing element E is designed as a flow guide trumpet that widens toward the throttled flow path 14.
  • the throttled flow path 14 can be bypassed by a check valve C, which according to FIG. 2 either in the piston K directly or 3 is arranged in a channel 17 in the housing.
  • the channel 17 leads from the connection A to the storage chamber 13.
  • a throttled flow path 14 ' is housed directly in the piston K, which is symbolized by a throttle 16th is characterized.
  • a separate flow path 14 ′′ with the throttle 16 running in the housing could be provided (alternatively or additively).
  • the piston K could be equipped with a pressure compensation groove or a seal (Fig. 3).
  • the piston K which is larger than the control piston R and forms a displacement element, forces a strong flow to fill the storage chamber 13 even for a relatively small amount of pressure medium, which flow has to pass through the throttled flow path 14, 14 ', 14' '. With this strong flow even with a small amount of pressure medium, an effective hydraulic damping effect for the control piston R can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Gas Separation By Absorption (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP97107824A 1996-09-05 1997-05-13 Soupape de siège de réduction de pression Expired - Lifetime EP0829794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29615498U DE29615498U1 (de) 1996-09-05 1996-09-05 Druckminder-Sitzventil
DE29615498U 1996-09-05

Publications (2)

Publication Number Publication Date
EP0829794A1 true EP0829794A1 (fr) 1998-03-18
EP0829794B1 EP0829794B1 (fr) 2001-12-19

Family

ID=8028858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97107824A Expired - Lifetime EP0829794B1 (fr) 1996-09-05 1997-05-13 Soupape de siège de réduction de pression

Country Status (3)

Country Link
EP (1) EP0829794B1 (fr)
AT (1) ATE211273T1 (fr)
DE (2) DE29615498U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1970787A2 (fr) 2007-03-16 2008-09-17 HAWE Hydraulik GmbH & Co. KG Soupape à siège à réglage de pression
WO2013090458A1 (fr) * 2011-12-12 2013-06-20 Parker-Hannifin Corporation Soupape de réduction de pression comportant un relâchement de pression
CN113775590A (zh) * 2021-10-18 2021-12-10 山东泰丰智能控制股份有限公司 一种具备缓冲功能的定压差阀

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29808294U1 (de) 1998-05-07 1998-08-13 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Elektrohydraulischer Spannmodul
DE29808295U1 (de) 1998-05-07 1998-08-13 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Sitzventil
DE102016223347A1 (de) 2016-11-24 2018-05-24 Hawe Hydraulik Se Druckregelventil mit einer Dämpfungsvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168721A (en) * 1977-06-16 1979-09-25 Massey-Ferguson Inc. Pressure control valve
US4190076A (en) * 1978-03-24 1980-02-26 The Singer Company Damping valve for pressure regulator
US4252141A (en) * 1977-01-03 1981-02-24 Itt Industries, Inc. Flow control valve
DE3201432A1 (de) * 1982-01-19 1983-09-08 Uwe 2000 Hamburg Heine Daempfungseinrichtung fuer steuerkolben
US4603710A (en) * 1981-05-25 1986-08-05 Sulzer Brothers Limited Non-return valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252141A (en) * 1977-01-03 1981-02-24 Itt Industries, Inc. Flow control valve
US4168721A (en) * 1977-06-16 1979-09-25 Massey-Ferguson Inc. Pressure control valve
US4190076A (en) * 1978-03-24 1980-02-26 The Singer Company Damping valve for pressure regulator
US4603710A (en) * 1981-05-25 1986-08-05 Sulzer Brothers Limited Non-return valve
DE3201432A1 (de) * 1982-01-19 1983-09-08 Uwe 2000 Hamburg Heine Daempfungseinrichtung fuer steuerkolben

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1970787A2 (fr) 2007-03-16 2008-09-17 HAWE Hydraulik GmbH & Co. KG Soupape à siège à réglage de pression
WO2013090458A1 (fr) * 2011-12-12 2013-06-20 Parker-Hannifin Corporation Soupape de réduction de pression comportant un relâchement de pression
CN113775590A (zh) * 2021-10-18 2021-12-10 山东泰丰智能控制股份有限公司 一种具备缓冲功能的定压差阀

Also Published As

Publication number Publication date
DE59705857D1 (de) 2002-01-31
DE29615498U1 (de) 1996-10-24
EP0829794B1 (fr) 2001-12-19
ATE211273T1 (de) 2002-01-15

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