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WO2000001969A1 - Agencement de vanne destine a reguler le debit d'un fluide - Google Patents

Agencement de vanne destine a reguler le debit d'un fluide Download PDF

Info

Publication number
WO2000001969A1
WO2000001969A1 PCT/DK1999/000360 DK9900360W WO0001969A1 WO 2000001969 A1 WO2000001969 A1 WO 2000001969A1 DK 9900360 W DK9900360 W DK 9900360W WO 0001969 A1 WO0001969 A1 WO 0001969A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pilot
housing
auxiliary
throttle
Prior art date
Application number
PCT/DK1999/000360
Other languages
English (en)
Inventor
Gitte Jørgensen KOLBECK
Peter Graversen
Original Assignee
Danfoss A/S
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 Danfoss A/S filed Critical Danfoss A/S
Priority to AU46031/99A priority Critical patent/AU4603199A/en
Publication of WO2000001969A1 publication Critical patent/WO2000001969A1/fr

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/005—Control of flow characterised by the use of auxiliary non-electric power combined with the use of electric means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0106—Control of flow without auxiliary power the sensing element being a flexible member, e.g. bellows, diaphragm, capsule

Definitions

  • Valve arrangement for controlling a fluid flow
  • the invention relates to a valve arrangement for controlling a fluid flow, especially for a relatively large system, such as a heating or water supply system, having a main valve controlled by differential pressure and an adjustable pilot valve in a pilot line bridging the main valve, from which pilot line a first control pressure line before a pilot throttle, especially the pilot valve, leads to one pressure chamber of the main valve and a second control pressure line after the pilot throttle leads to the other pressure chamber of the main valve, a throttle being arranged in one control pressure line.
  • Such a valve arrangement is known from the publication "Constant Differential Pressure C306 - C36C" of the company Socla (Publication 26 98 433 - 07/92) .
  • a motorized valve is arranged in series with the main valve, the fall in pressure of which motorized valve controls the pilot valve.
  • a displacement of the motorized valve results in a displacement of the pilot valve which in turn results in a displacement of the main valve.
  • Relatively large main valves for example having a conduit diameter of 125 mm and more, can be actuated using such a pilot control system.
  • Such a valve arrangement has a tendency to oscillate, however, upon displacement, the oscillations manifesting themselves in fluctuations in the throughput or in a value that is dependent thereupon, such as the flow temperature of a heating system.
  • manually adjustable throttles are provided both in the initial section of the pilot line and in one of the control pressure lines in an attempt to reduce the tendency to oscillate. That adjustment has to be adapted to each system, in which different pressure ratios prevail, and is valid only for one specific operating point.
  • the problem underlying the invention is to provide a valve arrangement of the type described at the beginning, the oscillation tendency of which is reduced to a great extent over a relatively large control range.
  • the problem is solved according to the invention in that there is arranged in a pilot or control pressure line at least one auxiliary valve controlled by differential pressure, which is so controlled by the fall in pressure of the throttle that the fall in pressure does not exceed a threshold value.
  • the auxiliary valve As a result of the action of the auxiliary valve, the displacement of the main valve is effected, at a maximum, at a predetermined constant speed. The changes in speed typical of oscillations are thereby prevented. Since the flow limitation by the auxiliary valve is effective upon each displacement of the main valve, the tendency to oscillate is prevented over the entire operating range. A further advantage is that it is generally possible to dispense with a second manually adjustable throttle in the pilot line.
  • the throttle is especially advantageous for the throttle to be a fixed throttle. In conjunction with the auxiliary valve, it can work in any desired systems. Adaptation to each individual case is therefore no longer necessary in virtually all cases.
  • a single auxiliary valve is sufficient, which limits the flow in the control pressure line to the main valve or away from it.
  • One auxiliary valve is responsible for the flow in the control pressure line to the main valve and the other is responsible for the opposite flow.
  • the two auxiliary valves have a common housing and a common diaphragm. This reduces costs and the amount of space required.
  • a hollow valve stem is provided with a closure member at both ends, each closure member co-operating with a seat, and has through openings in the wall near the two ends and is connected to the diaphragm approximately at the centre, a valve spring being provided at both ends.
  • closure members be formed by the bases of two cup-shaped coverings, which are pressed against the ends of the hollow valve stem by valve springs and also have through openings in their wall.
  • a further advantage is obtained by the integration of the throttle in the housing of at least one auxiliary valve arranged in a control pressure line and by the provision of auxiliary lines inside the housing which lead from the two pressure chambers of the auxiliary valve to tapping points on each side of the throttle.
  • the parts essential for the flow limitation are therefore combined to form a single unit.
  • the housing of at least one auxiliary valve arranged in a control pressure line be located in the housing of the pilot valve. Additional line connections for the auxiliary valve are therefore not required.
  • the housing common to both auxiliary valves prefferably located in the housing of the pilot valve. In that manner a number of intermediate connections can be integrated, resulting in considerable simplification during assembly. It is also advantageous for the housing of the pilot valve to have a threaded connecting part coaxial with its valve seat bore, into which connecting part there is screwed the housing of the auxiliary valve, and for a gap, forming a fixed throttle, to remain between the separating wall with the valve seat bore and the end face of the auxiliary valve housing, from which gap there issues a centrical connecting bore in the auxiliary valve housing. If the throttle resistance of the fixed throttle is considerably greater than (approximately twice as great as) the flow resistance between the seat and the closure member of the pilot valve, it is possible to dispense with a separate fixed throttle.
  • a control element for example a motorized valve, be arranged in series with the main valve and that the pilot valve be a differential pressure-controlled diaphragm valve which is controlled by the fall in pressure at the motorized valve. In that manner, relatively large main valves can also be displaced without oscillation.
  • Fig. 1 is a circuit diagram of a valve arrangement according to the invention
  • Fig. 2 shows a second embodiment
  • Fig. 3 is a diagrammatic drawing of two combined auxiliary valves
  • Fig. 4 shows a third embodiment
  • Fig. 5 shows a fourth embodiment
  • Fig. 6 is a section through a pilot valve housing having auxiliary valves located therein;
  • Fig. 7 is a longitudinal section through a pilot valve having associated attachments.
  • a main valve 2 and a control element 3 in the form of a motorized valve are connected in series in a main conduit 1.
  • a pilot line 4 bridges the main valve 2 and comprises, in succession, a fixed throttle 5, an auxiliary valve 6 and a pilot valve 7.
  • the closure member 8 of the motorized valve is displaced by means of an electro-motor 9, in order to allow a specific throughput to flow through the valve arrangement in the direction of the arrow 10.
  • the pilot valve 7 has a diaphragm 11, which separates two pressure chambers 12 and 13 from one another, and an adjustable spring 15 acting in the opening direction of the closure member 14.
  • the two pressure chambers are connected via connecting lines 16 and 17 to portions of the main conduit 1 before and after the motorized valve 3.
  • the pilot valve is therefore controlled in dependence upon the fall in pressure at the motorized valve 3.
  • the main valve 2 has a diaphragm 18, which separates two pressure chambers 19 and 20 from one another, and a spring 22 acting in the closing direction of the closure member 21.
  • the pressure chambers are connected via control pressure lines 23 and 24 to line portions of the pilot line 4 before and after the pilot valve 7.
  • the main valve 2 is therefore controlled by the fall in pressure at the pilot valve 7.
  • the auxiliary valve 6 has a diaphragm 25, which separates two pressure chambers 26 and 27 from one another, and a spring 29 acting in the opening direction of the closure member 28.
  • a fixed throttle 30 is provided in the control pressure line 23.
  • the pressure chambers 26 and 27 are connected via auxiliary lines 31 and 32 to tapping points before and after the throttle 30.
  • the auxiliary valve is therefore controlled in dependence upon the fall in pressure at the throttle 30. That control system means that the flow through the control pressure line 23 to the pressure chamber 19 cannot exceed a predetermined threshold value.
  • the displacement speed of the closure member 21 of the main valve 2 is therefore limited, with the result that a
  • Fig. 2 shows a modification having a second auxiliary valve 106 in series with the first auxiliary valve 6 in the pilot line 4.
  • the pressure chambers of that second auxiliary valve 106 are also connected to the auxiliary lines 31 and 32, the pressure chambers being connected, however, in opposite sense. The result is that the flow speed in the control pressure line 23 is limited both for the medium flowing in and for the medium flowing out.
  • Each displacement of the motorized valve 3 thus results in a displacement of the pilot valve 7 and that in turn results in a displacement of the main valve 2 , the speed of which is, however, limited by the auxiliary valve 6.
  • Fig. 3 shows a double-action auxiliary valve 206 suitable for incorporation in the control pressure line 23 (Fig. 4) or 24 (Fig. 5) .
  • a hollow valve stem 33 carries a closure member 34 at one end, which co-operates with a seat 35, and a closure member 36 at the other end, which cooperates with a seat 37.
  • the hollow valve stem 33 also has through openings 38 and 39 near its ends.
  • a diaphragm 40 separates a pressure chamber 41 from a pressure chamber 42.
  • Two oppositely acting pressure springs 43 and 44 are also provided in the pressure chambers.
  • a fixed throttle 230 is integrated in the auxiliary valve 206.
  • the two pressure chambers 41 and 42 are connected via auxiliary lines 231 and 232 to tapping points before and after that throttle 230.
  • the pressure springs 43 and 44 are installed pre-stressed.
  • the valve stem 33 is therefore held in the central position shown.
  • the valve stem 33 moves in one direction or the other, as a result of which relatively strong throttling occurs between the closure member 34 and seat 35 or between the closure member 36 and seat 37, which limits the displacement speed of the main valve.
  • the housing 45 of a double-action auxiliary valve 306 is screwed into the housing 46 of the pilot valve 307.
  • the housing 45 has a connecting part 47 for connecting the control pressure line 324 leading to the main valve.
  • the diaphragm top part and the closure member of the pilot valve 307 are not shown.
  • reference numerals increased by 300 have been used.
  • the closure members 334 and 336 are in this case provided on cup-shaped coverings 48 and 49, respectively, which also have through openings 50 and 51, respectively, in their circumferential walls and which are loaded by the valve springs 343 and 344, respectively.
  • the auxiliary lines 331 and 332 extend inside the housing 45 of the auxiliary valve 306.
  • the auxiliary line 331 is formed by a radial groove 52 and an axial groove 53 in an insert 54, an annular groove 55 in the housing 45 and a bore 56 in a second insert 57.
  • the auxiliary line 332 is formed by a radial bore 58 in a third insert 59 and an axial bore 60 in the first insert 54.
  • the housing 45 and inserts 54, 57 and 59 are held together by bent-over edges.
  • the housing 46 of the pilot valve 307 has a connecting part 63 coaxial with the valve seat bore 62 arranged in a separating wall 61, into which connecting part the housing 45 is screwed.
  • the housing includes a cover 64, which has a centrical connecting bore 65.
  • a gap, forming a fixed throttle 305, remains between the separating wall 61 and the end face of the cover 64 of the housing 45.
  • the throttle resistance of that gap is significantly greater than the flow resistance through the throttle point, formed by the seat and closure member, of the fully opened pilot valve, for example it is approximately twice as large.
  • a diaphragm box 66 Attached to the side opposite the auxiliary valve 306, by means of a union nut, is a diaphragm box 66, which comprises a diaphragm 311 and two pressure chambers 312 and 313. Above it there is located a spring cap 67 which contains the spring 15 of Fig. 1 and is able to displace it.
  • the parts mentioned can be combined with one another readily, facilitating overall assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

Un agencement de vanne destiné à réguler le débit d'un fluide, notamment pour un système relativement grand, tel qu'un système de chauffage ou d'alimentation en eau, comprend une vanne principale (2) commandé par une pression différentielle ainsi qu'une vanne pilote (7) dans un conduit pilote (4) pontant la vanne principale (2). A partir du conduit pilote, un premier conduit (23) de pression de régulation conduit à une chambre de pression (19) de la vanne principal (2) et un second conduit de pression de régulation (24) conduit à l'autre chambre de pression (20) de la vanne principale. Un étrangleur (30) est également disposé dans un conduit de pression de régulation (23). Au moins une vanne auxiliaire (6) commandée par pression différentielle est agencée dans le conduit pilote (4) ou dans le conduit de pression de régulation (23, 24). La vanne auxiliaire est commandée par la chute de pression de l'étrangleur (30) et elle limite cette chute de pression à une valeur maximum. Ainsi, la vitesse de déplacement de l'élément de fermeture (21) de la vanne principale (2) peut être limitée et une tendance à l'oscillation peut ainsi être réduite.
PCT/DK1999/000360 1998-07-02 1999-06-24 Agencement de vanne destine a reguler le debit d'un fluide WO2000001969A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46031/99A AU4603199A (en) 1998-07-02 1999-06-24 Valve arrangement for controlling a fluid flow

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998129571 DE19829571B4 (de) 1998-07-02 1998-07-02 Ventilanordnung zur Steuerung eines Flüssigkeitsdurchflusses
DE19829571.5 1998-07-02

Publications (1)

Publication Number Publication Date
WO2000001969A1 true WO2000001969A1 (fr) 2000-01-13

Family

ID=7872751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000360 WO2000001969A1 (fr) 1998-07-02 1999-06-24 Agencement de vanne destine a reguler le debit d'un fluide

Country Status (3)

Country Link
AU (1) AU4603199A (fr)
DE (1) DE19829571B4 (fr)
WO (1) WO2000001969A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1304760C (zh) * 2004-06-16 2007-03-14 陈城书 一种电液芯片用电液管

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1453251A (en) * 1973-01-25 1976-10-20 Deinlein Kalb J A F Conbined starting and rapid shut-off valve for a steam or gas turbine
SE451153B (sv) * 1986-01-20 1987-09-07 Dominator Ab Sett att endra trycket i pneumatiska eller hydrauliska system och anordning for att genomfora settet
US5511581A (en) * 1994-10-31 1996-04-30 Ligh; Jone Y. Vent valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783892A (en) * 1972-10-03 1974-01-08 Honeywell Inc Long timing, slow flow device
FR2667408B1 (fr) * 1990-09-27 1992-12-31 Emerit Michel Procede et dispositif pour la regulation automatique du debit de fluide dans un reseau de distribution de fluide en fonction des variations de pression.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1453251A (en) * 1973-01-25 1976-10-20 Deinlein Kalb J A F Conbined starting and rapid shut-off valve for a steam or gas turbine
SE451153B (sv) * 1986-01-20 1987-09-07 Dominator Ab Sett att endra trycket i pneumatiska eller hydrauliska system och anordning for att genomfora settet
US5511581A (en) * 1994-10-31 1996-04-30 Ligh; Jone Y. Vent valve

Also Published As

Publication number Publication date
DE19829571A1 (de) 2000-01-20
AU4603199A (en) 2000-01-24
DE19829571B4 (de) 2004-03-18

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