EP0122247A1 - Control valve - Google Patents
Control valve Download PDFInfo
- Publication number
- EP0122247A1 EP0122247A1 EP84850112A EP84850112A EP0122247A1 EP 0122247 A1 EP0122247 A1 EP 0122247A1 EP 84850112 A EP84850112 A EP 84850112A EP 84850112 A EP84850112 A EP 84850112A EP 0122247 A1 EP0122247 A1 EP 0122247A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pressurized fluid
- control valve
- communicates
- slide
- 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
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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
- F15B11/068—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with valves for gradually putting pneumatic systems under pressure
Definitions
- the control valve shown in Fig.1 comprises a two-part valve casing with an upper casing half 1 and a lower casing half 2 being screwed together into mutual contact in a parting plane and being sealed by means of a combination sealing element, which is formed in one piece and includes a planar portion (not shown) located in said parting plane as well as ring portions connected thereto and oriented perpendicularly to the planar portion. In Fig. 1 these ring portions are denoted 3a-3f.
- Each casing half 1, 2 has half-cylindrical recesses located adjacent to the parting plane and forming together a cylindrical valve chamber 4.
Abstract
Description
- The invention relates to a control valve for a controlled supply of pressurized fluid, especially pressurized air, from a source of pressurized fluid to a pressurized fluid system, of the kind stated in the preamble of
claim 1. - Such a control or air supply valve is known from SE-C-7906261-8 and ensures that the pressure increase will be relatively slow during a first phase of air supply, so as to avoid that work cylinders or other apparatus operable by pressure perform sudden movements under the influence of a pressure shock. When a pneumatic system has been left depressurized for some time, e.g. during a week-end, it could in fact occur that cylinder pistons or the like have arrived at such positions that, upon supply of air, the pistons have no counter-pressure and therefore perform an uncontrolled, jerky movement.
- The object of the present invention is to considerably simplify the known valve structure in such a way that the main valve is integrated with the choke and pressure control valve, so that these valve parts can be accomodated in a common valve chamber in a valve casing.
- This object is achieved, according to the invention, in that the inlet port(which is connected to the source of pressurized fluidjof the control valve communicates with the valve chamber via, on the one hand,a flow passage having a relatively large cross-sectional area and, on the other hand, a choke opening having a considerably smaller cross-sectional area, and that the slide of the valve is provided with a piston body, which is displaceable thereon and which, in the air supply positionα of the valve (wherein the inlet port communicates with the outlet port connected to the pressurized fluid system in question),is displaceable between an initial position, in which the inlet port communicates with the outlet port only via the choke opening and a final position, in which the inlet port communicates with the outlet port via the flow passage having a relatively large cross-sectional area as well.
- By this means, the control valve may comprise only one valve chamber, in which the valve slide with the adjoining piston body is displaceable. Moreover, a considerable structural simplification is achieved by avoiding two separate valves each being arranged in a separate valve chamber and being connected to each other via a number of conduits or channels in the valve casing. Manufacture as well as operation and reliability will be enhanced thereby.
- A particularly good operabiliy is isachieved if the piston body, being displaceable on the valve slide, is provided with a piston surface facing the outlet port and being so dimensioned that, upon reaching a predetermined pressure in the connected pressurized fluid system, it is subjected to a reversing force, which exceeds a counter-force, eJg: exerted by a compression spring, so that the piston body is displaced to said final position.
- Additional inventive features and advantages appear from the sub-claims and the detailed description below. Thus, the invention will be described further below with reference to the appended drawings illustrating a preferred embodiment.
-
- Fig. 1 shows a central longitudinal section through a control valve according to the invention, wherein a slide valve is located in a first position being uninfluenced by outer control forces;
- Fig.2 shows schematically the control valve according to Fig.1 with the slide valve located in a second position, during a first air supply phase; and
- Fig.3 shows the control valve according to Fig. 1 with the slide valve located in a third position, permitting full air supply.
- The control valve shown in Fig.1 comprises a two-part valve casing with an
upper casing half 1 and alower casing half 2 being screwed together into mutual contact in a parting plane and being sealed by means of a combination sealing element, which is formed in one piece and includes a planar portion (not shown) located in said parting plane as well as ring portions connected thereto and oriented perpendicularly to the planar portion. In Fig. 1 these ring portions are denoted 3a-3f. Eachcasing half 1,2 has half-cylindrical recesses located adjacent to the parting plane and forming together a cylindrical valve chamber 4. The latter is lined with acylinder tube 5, which is provided with several hole openings (to be explained further below) and is externally sealed in the axial direction by means of the above...mentioned sealing ring portions 3a-3f. At the ends of thecylinder tube 5,end portions cylinder tube 5 and via recesses 6a, 7a in each end portion. - Inside the
cylinder tube 5, avalve slide 8 is displaceably mounted. Thevalve slide 8 is provided, at its end portion to the left in the figure, with a fixed piston portion 8a with two sealing rings 9,10,whlch sealingly contact the inside of. thecylinder tube 5. The opposite end of the valve slide consists of a central, rathernarrow shank 8b, on which an enclosing,cylindrical piston body 11 is displaceable between a first abutment 12 formed by a shoulder surface at the foot of theshank 8b, and asecond abutment 13 consisting of a steel ring, e.g. a so called Seeger-ring, inserted in an annular groove on theshank 8b. The movable piston body has piston portions 14 and 15, respectively, each provided with a piston sealing ring 16 and 17, respectively, at each end. Ahelical compression spring 18 is inserted between theend portion 7 and themovable piston body 11, so that the valve slide 8 and thepiston body 11 takes the position shown in Fig. 1 in the absence of other forces. - The
valve casing inlet port 19 to be connected to a source of pressurized fluid (not shown), e.g. a central compressor unit, an outlet port 20 to be connected to a pressurized fluid system, e.g. a pneumatic system having working cylinders and components belonging thereto, anexhaust port 21, e.g. for venting the connected pressurized fluid system, and anactuatirgport 22 to be pressurized for displacement of thevalve slide 8 to the right against the action of thespring 18, and anevacuation port 23. In the right part of thevalve casing screw 24 in a central through-bore in the valve casing and a threaded hole in theend portion 7 opposite to the end of theshank 8b of thevalve slide 8. Thereby, an adjustable stop means is obtained for thevalve slide 8. The adjustingscrew 24 can be fixed in an adjusted position by means of alock nut 25 which is tightened into contact with the outside of the valve casing. - In the shown position in Fig. 1, the control valve is closed. The source of pressurized fluid communicates via the
inlet port 19, an adjoining ring chamber 26, a set of hole openings 27 having a relatively large cross-sectional area and achoke hole 28 having a substantially smaller cross-sectional area, with the limited annular chamber formed between the sealing rings 26 and 27 of the movable piston body. The pressurized fluid system is vented in that the outlet port 20, connected thereto, communicates with theexhaust port 21 via an annular chamber 3: a set ofhole openings 29 in thecylinder tube 5, the annual space between the inside of thecylinder tube 5 and the outside of thevalve slide 8, still another set ofhole openings 30 in thecylinder tube 5, and anannular chamber 32. - From the first closing position according to Fig. 1, the
valve slide 8 and thepiston body 11 displaceable thereon can be reversed to a second, opening position according to Fig. 2 in that a control signal (e.g. pressurized air) is fed to theactuation port 22. Thereby, the connection between the outlet port 20 and theexhaust port 21 is broken, while the pressurized fluid from the source of pressurized fluid flows through theinlet port 19, the annular chamber 26, thechoke hole 28, thehole openings 29, the annular chamber 31 and the outlet port 20 into the connected pressurized fluid system. Thus, in the latter a pressure build-up will occur relatively slowly, owing to the limited flow through thechoke hole 28, so that possibly mal-positioned cylinder pistons or the like are displaced into distinct positions. During this first phase of pressure build-up, a desired flow rate can be set by means of the adjustingscrew 24, whereby the position of the sealing ring 16 can be varied relative to thechoke hole 28. Thus, thechoke hole 28 may be more or less covered by the sealing ring 16, so that the effective cross-sectional area is adjusted correspondingly. - The pressure grows gradually in the pressurized fluid system and consequently also in the annular chamber between the fixed piston portion 8a of the valve slide and the
displaceable piston body 11. Thus, the pressure acts on the end surface of thepiston body 11 facing the outlet port 20, and when the pressure force caused thereby exceeds the counter-force of thespring 18, thepiston body 11 will be displaced from the initial position according to Fig. 2 into a final position, which is shown in Fig. 3, wherein its opposite end surface engages with thestop ring 13. The distance (in the axial direction) between thechoke hole 28 and the hole openings 27 is less than the displacement of thepiston body 11, and the hole openings 27 will therefore be laid free on the same side as thechoke hole 28 after the passage of the sealing ring 16. As a result, theinlet port 19 will communicate with the outlet port 20 also via these hole openings 27, which have a substantially larger cross sectional area than thechoke hole 28. Therefore, the pressurized fluid flow can increase quickly, so that the further pressure build-up in the connected pressurized fluid system occurs relatively quickly during this second phase of the pressurized fluid supply. - When the control valve is to be closed again and the pressurized fluid system is to be vented, the
valve slide 8 is relocated in that the pressure on thesignal port 22 is brought to cease, whereby thecompression spring 18 displaces the valve slide and thepiston body 11 to the left in the figures, and the position according to Fig. 1 is reached. - It will be apparent that a number of detail changes can be made within the scope of the claims.
- Thus, the
choke opening 28 does not have to be an elongated hole, as shown, but can be constituted by e.g. a number of small holes distributed axially and/or circumferentially in such a way that the effective cross-sectional area is adjustable. One or several of these holes may furthermore consist of an elongated slot extending all the way to the hole openings 27. Even the latter may have a different configuration and a variable, effective cross-section, The essential feature is that thechoke opening 28 has a considerably smaller cross sectional area than the one of the flow passage formed by the hole openings 27. - Although the shown embodiment having a
cylinder tube 5 provided with holes is rather practical, said cylinder tube may in principle be eliminated and, instead, the various openings may be located directly in the valve casing. Likewise, the adjustingscrew 24 may be eliminated or replaced by a stop displaceably arranged on theshaft 8b of the valve slide, e.g. a nut which is screwed onto the shank and replaces thestop ring 13 as well.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84850112T ATE28688T1 (en) | 1983-04-11 | 1984-04-09 | CONTROL VALVE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8301993 | 1983-04-11 | ||
SE8301993A SE442434B (en) | 1983-04-11 | 1983-04-11 | CONTROL VALVE FOR CONTROLLED PRESSURE SUPPLY TO AND PRESSURE BUILDING IN A PRESSURE SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0122247A1 true EP0122247A1 (en) | 1984-10-17 |
EP0122247B1 EP0122247B1 (en) | 1987-07-29 |
Family
ID=20350744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84850112A Expired EP0122247B1 (en) | 1983-04-11 | 1984-04-09 | Control valve |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0122247B1 (en) |
JP (1) | JPS60501020A (en) |
AT (1) | ATE28688T1 (en) |
DE (1) | DE3465134D1 (en) |
DK (1) | DK159796C (en) |
FI (1) | FI73804C (en) |
HU (1) | HU197420B (en) |
SE (1) | SE442434B (en) |
WO (1) | WO1984004147A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0488493A1 (en) * | 1990-11-26 | 1992-06-03 | Ross Operating Valve Company | Safety valve for fluid systems |
US5361803A (en) * | 1992-07-16 | 1994-11-08 | Festo Kg | Spool valve |
WO2000046531A1 (en) * | 1999-02-03 | 2000-08-10 | Split-Cycle Technology Limited | Improvements in air motors |
FR2799815A1 (en) * | 1999-10-15 | 2001-04-20 | Crouzet Automatismes | Pipe system for use in compressed air distributor is fitted inside mechanical component and consists of tubular insert held in place by locking sleeve which slides over insert |
CN104395614A (en) * | 2012-08-15 | 2015-03-04 | 萱场工业株式会社 | Switching valve |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4324939C2 (en) * | 1993-07-24 | 1995-11-23 | Festo Kg | Spool valve |
CN110944801B (en) * | 2017-07-24 | 2023-06-30 | 古河凿岩机械有限公司 | Hydraulic impact device |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2308191A1 (en) * | 1972-03-14 | 1973-09-27 | Westinghouse Freins & Signaux | PRESSURE MEDIUM DISTRIBUTOR |
DE2245017A1 (en) * | 1972-09-14 | 1974-04-11 | Reinhard Kucharzyk | PRE-CONTROLLED AND REMOTE CONTROLLED HYDRAULIC, SELF-CONTROLLING DIRECTIONAL VALVE, ALSO SUITABLE FOR GAS MEDIA |
US3952775A (en) * | 1975-03-14 | 1976-04-27 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Electromagnetic change-over valve |
DE2618683A1 (en) * | 1975-05-05 | 1976-11-18 | Borg Warner | CONTROL VALVE |
DE1945064B2 (en) * | 1969-09-05 | 1977-06-02 | DIRECTIONAL VALVE | |
US4182375A (en) * | 1978-05-13 | 1980-01-08 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Spool-sleeve type change-over valve |
DE2833358A1 (en) * | 1978-07-29 | 1980-02-07 | Demag Ag Mannesmann | Pneumatic or hydraulic control valve - has outlet ports formed by holes of gradually increasing size to give gradual pressure increase |
EP0033303A1 (en) * | 1980-01-23 | 1981-08-05 | AB Mecman | Sealing device in valve casings |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5434484B2 (en) * | 1972-09-11 | 1979-10-27 | ||
JPS5122127A (en) * | 1974-08-20 | 1976-02-21 | Toyooki Kogyo Kk | RYUTAI SEIGYOBEN |
SE418523B (en) * | 1979-07-20 | 1981-06-09 | Mecman Ab | VALVE DEVICE FOR CONNECTING TO A PRESSURE CELL AND CONTROLLED PRESSURE SUPPLY TO AND PRESSURE BUILDING IN A PRESSURE SYSTEM |
-
1983
- 1983-04-11 SE SE8301993A patent/SE442434B/en not_active IP Right Cessation
-
1984
- 1984-04-09 AT AT84850112T patent/ATE28688T1/en active
- 1984-04-09 JP JP59501759A patent/JPS60501020A/en active Granted
- 1984-04-09 EP EP84850112A patent/EP0122247B1/en not_active Expired
- 1984-04-09 DE DE8484850112T patent/DE3465134D1/en not_active Expired
- 1984-04-09 WO PCT/SE1984/000129 patent/WO1984004147A1/en active IP Right Grant
- 1984-04-09 HU HU842252A patent/HU197420B/en not_active IP Right Cessation
- 1984-11-15 DK DK543384A patent/DK159796C/en not_active IP Right Cessation
- 1984-11-23 FI FI844616A patent/FI73804C/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1945064B2 (en) * | 1969-09-05 | 1977-06-02 | DIRECTIONAL VALVE | |
DE2308191A1 (en) * | 1972-03-14 | 1973-09-27 | Westinghouse Freins & Signaux | PRESSURE MEDIUM DISTRIBUTOR |
DE2245017A1 (en) * | 1972-09-14 | 1974-04-11 | Reinhard Kucharzyk | PRE-CONTROLLED AND REMOTE CONTROLLED HYDRAULIC, SELF-CONTROLLING DIRECTIONAL VALVE, ALSO SUITABLE FOR GAS MEDIA |
US3952775A (en) * | 1975-03-14 | 1976-04-27 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Electromagnetic change-over valve |
DE2618683A1 (en) * | 1975-05-05 | 1976-11-18 | Borg Warner | CONTROL VALVE |
US4182375A (en) * | 1978-05-13 | 1980-01-08 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Spool-sleeve type change-over valve |
DE2833358A1 (en) * | 1978-07-29 | 1980-02-07 | Demag Ag Mannesmann | Pneumatic or hydraulic control valve - has outlet ports formed by holes of gradually increasing size to give gradual pressure increase |
EP0033303A1 (en) * | 1980-01-23 | 1981-08-05 | AB Mecman | Sealing device in valve casings |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0488493A1 (en) * | 1990-11-26 | 1992-06-03 | Ross Operating Valve Company | Safety valve for fluid systems |
US5361803A (en) * | 1992-07-16 | 1994-11-08 | Festo Kg | Spool valve |
WO2000046531A1 (en) * | 1999-02-03 | 2000-08-10 | Split-Cycle Technology Limited | Improvements in air motors |
FR2799815A1 (en) * | 1999-10-15 | 2001-04-20 | Crouzet Automatismes | Pipe system for use in compressed air distributor is fitted inside mechanical component and consists of tubular insert held in place by locking sleeve which slides over insert |
CN104395614A (en) * | 2012-08-15 | 2015-03-04 | 萱场工业株式会社 | Switching valve |
CN104395614B (en) * | 2012-08-15 | 2016-11-23 | Kyb株式会社 | Switching valve |
Also Published As
Publication number | Publication date |
---|---|
HU197420B (en) | 1989-03-28 |
ATE28688T1 (en) | 1987-08-15 |
DK159796C (en) | 1991-07-22 |
JPH0553994B2 (en) | 1993-08-11 |
FI73804C (en) | 1987-11-09 |
WO1984004147A1 (en) | 1984-10-25 |
EP0122247B1 (en) | 1987-07-29 |
DK159796B (en) | 1990-12-03 |
SE8301993D0 (en) | 1983-04-11 |
HUT35354A (en) | 1985-06-28 |
SE442434B (en) | 1985-12-23 |
SE8301993L (en) | 1984-10-12 |
DK543384D0 (en) | 1984-11-15 |
DK543384A (en) | 1984-11-15 |
FI844616L (en) | 1984-11-23 |
DE3465134D1 (en) | 1987-09-03 |
JPS60501020A (en) | 1985-07-04 |
FI73804B (en) | 1987-07-31 |
FI844616A0 (en) | 1984-11-23 |
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