WO1989002047A1 - Dispositif a clapet - Google Patents

Dispositif a clapet Download PDF

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Publication number
WO1989002047A1
WO1989002047A1 PCT/SE1988/000427 SE8800427W WO8902047A1 WO 1989002047 A1 WO1989002047 A1 WO 1989002047A1 SE 8800427 W SE8800427 W SE 8800427W WO 8902047 A1 WO8902047 A1 WO 8902047A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
chamber
connection line
chambers
pressurized
Prior art date
Application number
PCT/SE1988/000427
Other languages
English (en)
Inventor
Per Hedlund
Original Assignee
Svahn, Ove
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 Svahn, Ove filed Critical Svahn, Ove
Publication of WO1989002047A1 publication Critical patent/WO1989002047A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/30—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers
    • F16K1/307—Additional means used in combination with the main valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks
    • F16K17/196—Equalising valves predominantly for tanks spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0382—Constructional details of valves, regulators
    • F17C2205/0385—Constructional details of valves, regulators in blocks or units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/048—Methods for emptying or filling by maintaining residual pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/015—Facilitating maintenance

Definitions

  • the invention relates to a valve device according to the preamble of claim 1.
  • valve devices are known through DE-OS 2 131 805 and 2 261 762.
  • the first one of these publications describes a valve device in which the two valve units are inserted in a common chamber, the opening of which also forms the fluid outflow opening. This means that it for maintenance, change or adjustment of the valve units will be necessary to carry out a disassembly work in a comparatively large scale, since mostly further components are connected to the outflow opening. As a consequence of this it is necessary to cause an interuption in the use of the valve device and the devices connected thereto. This may in the practice involve considerable disadvantages.
  • valve units according to the German published literature are comparatively complicated and they are more exactly integrally built up in such a way that the valve seat for the mobile valve member of the second valve unit is made on the mobile valve member of the first valve unit.
  • the manufacturing costs are also getting important.
  • the closing pressure of the first valve unit may be adjusted (however, after considerable disassembling work through the outflow line) in such a way as described in the German published cation, -it would be necessary to completely remove the valve units from the body of the valve device, if it would be requi ⁇ red to adjust the opening pressure of the second valve unit.
  • valve device based on valve members in the form of elastic discs. Even though this valve device is constructively more simple it has the same disadvantages as the one according to the first mentioned German publication with respect to the disassembling work required in connection with maintenance etc, and thereto a disadvantage of the demand to a change of the valve means for variation of a closing and opening pressure is added.
  • the object of the present invention is to reduce the disadvan ⁇ tages mentioned above and accordingly obtain a valve device, which on one hand is of a simple construction and on the other requires a minimum of work in maintenance and disassembling of the valve units, as well as adjustment should be very easy to carry out when the valve units are made adjustable.
  • valve units will be easy to get access to from the outside of the valve body through the openings of the chambers without the necessity to dissembling components attached to the valve device, so that they communicate with the connection lines.
  • the valve device does also become extremely simple, since the valve units are in a constructive way independently of each other located in their chambers. Furthermore, by using the characteristics according to the dependent claims 2-10 further simplifications are obtained with respects to the flow paths of the valve device and accordingly with respect to the very manufacturing of the device.
  • Fig 1 is a partially longitudinal section through a first embodiment of the valve device
  • fig 2 is a similar section through a second embodiment.
  • the valve device which is generally indicated by 2, has a valve body 3 made of one piece ' .
  • connection means 4 here in the form of a male threaded shaft, for connection to corresponding connection means, e.g. a female threaded bore in the gas bottle.
  • connection means e.g. a female threaded bore in the gas bottle.
  • the body 3 has a bore 5, which is provided with an internal thread for connection to arbitrary components in the form of lines, valves etc.
  • a male threaded sleave or the like will serve as means for connection to the threaded bore 5.
  • the bore 5 will therefore in the practice constitute a connection line which has an outer orifice 23 at the outside of the body 3.
  • the valve device is intended to communicate with the interior of the gas bottle through a connection line 6 with an outer orifice 24 at the outside of the body 3 and allow gas outflow from the interior of the gas bottle schematically indicated by 8 through the connection line 5 and a line portion 7.
  • connection line 5, 7 may be brought into communication with the gas source for filling a gas bottle.
  • connection lines 5, 6 and their orifices may of course be differently shaped, if connection means of another type has to be connected thereto.
  • the valve device 2 is conceived to maintain a residual pressure in the interior 8 of the gas bottle but allow supply of pressurized fluid to this interior when pressure is applied on the lines 5, 7. More in detail the valve device comprises two non-return valve units 9 and 10, one 9 of which closes against gas outflow from the gas bottle when the pressure falls below a certain level whereas the other 10 is intended to open upon application of a sufficient pressure on the line 5, 7.
  • the valve unit 9 guarantees that the pressure in the gas bottle only sinks to a predetermined value at which the valve 9 closes. By that there is no risk of return of impurities, condensate or undesired gas from the environment.
  • the valve unit 10 the gas bottle may be filled as soon as a sufficiently high pressure is applied in the line 5, 7. No complex filling devices are required.
  • valve device 2 Besides the valve device 2 according to the invention a cut-off valve will of course be required.
  • a valve may be arranged either between the gas bottle 1 and the valve device 2 or be connected through the connection means or bore 5 of the latter, i.e. in the gas outflow direction downstream of the valve device 2.
  • the non-return valve units 9 and 10 are located in two diffe ⁇ rent chambers 11 and 12 in the body 3 of the valve device, and each of these chambers is accessible from the outside of the body through an opening 13 and 14, respectively, of their own separated from the outer orifices 23, 24 of the connection lines 5, 6 in order to insert and remove, respectively, and possibly also adjust the valve units or parts thereof through these openings.
  • the openings 13, 14 of the chambers emerge on the outer side of the body 3 of the valve device in substantially opposite directions. .
  • connection lines 5, 6 emerge at two opposite ends of the valve device body and the openings 13, 14 of the chambers emerge on the outer side of the body substantially perpendi ⁇ cularly to the emerging direction of the connection lines 5, 6.
  • the chambers 11, 12 are directed, so that their longitudinal directions are substantially perpendicular to the main flow direction through the valve device body and in the example substantially perpendicular to the longitudinal direction of the valve device body.
  • the valve device comprises two flow paths, to which the connection lines are common.
  • the two chambers 11, 12 for the valve units both form parts of each of these two flow paths.
  • connection line 6 communicates with a chamber 12 of the valve unit 10, which communicates with the chamber 11 of the valve unit 9 through a line portion 15, said valve unit 9 being arranged to close and open, respectively, the communication between this line portion 15 and its chamber 11.
  • the connection line 5 communicates with the chamber 11 of the valve unit 9 through the line portion 7 and this chamber communicates with the chamber 12 of the valve unit 10 through a second line portion 16, said valve unit 10 being arranged to close and open, respectively, the communication between a second line portion 16 and its chamber 12.
  • the first flow path is formed by the connection line 6, the chamber 12, the line portion 15, the chamber 11 and the connection line 5, 7, whereas the second flow path is formed by the connection line 5, 7, the chamber 11, the line portion 16, the chamber 12 and the connection lines 6.
  • the valve unit 9 is active for closing and opening, respectively, whereas the second valve unit 10 is completely passive, so that there is always a free flow through this chamber 12.
  • the valve unit 10 is active or closing and opening, respectively, whereas the valve unit 9 is completely passive and does accordingly always allow fluid flow through its chamber 11.
  • the chambers 11 and 12 are substantially parallel to each other but mutually displaced perpendicularly to their longitudinal axis in the way illustrated in fig 1. In a region in the central part of the valve device the chambers extend past each other, so that they overlap each other, although they are located at a mutual distance.
  • connection line 6 and the line portion 15 are formed by a rectilinearly extending channel, preferably achieved by a bore, which traverses the chamber 12.
  • the line portion 7 and the line portion 16 are formed by a rectilinearly extending second channel, preferably here also a bore, which traverses the chamber 11 and emerges into the bore 5. If instead of an in ⁇ ternal threaded hole 5 a male threaded connection portion would be provided the line 7 could extend all the way to its extre ⁇ mity and then form the orifice 23.
  • the chambers 11 and 12 may also advantageously be achieved by drilling.
  • Each of the valve units 9 and 10 comprises in the bottom region of the chamber 11 and 12, respectively, a valve seat coopera ⁇ ting with a mobile valve member 18, which by means of a spring 19 housed within the chamber in question is affected to coope ⁇ rate with the valve seat 17 in a closing manner.
  • the valve seat 17 may be made in one and the same piece with the valve device body 3 and in this case it will be suitable to carry out an opening 20 in the seat by drilling, but the valve seat 17 may also consists of a separate member, for instance a disc-like one, inserted in the chamber in question. This may be arranged and secured in the chamber in question by means of threads " or other suitable securing means.
  • valve units 9 and 10 may be non-adj stable, so that they accordingly close and open, respectively, at predetermined pressures. However, it could often be desired to be able to adjust the closing and opening pressure, respectively, for at least one of and generally both valve units 9 and 10, and this may be accomplished by the fact that the spring tension of the spring 19 for the valve unit in question is adjustable by means of an adjustment means 28 located in the chamber 11 and/or 12 in question, e.g. a screw cooperating with a thread on the chamber wall, acting as an abutment for the spring 19, which here is illustrated as a helicoidal compression spring.
  • an adjustment means 28 located in the chamber 11 and/or 12 in question, e.g. a screw cooperating with a thread on the chamber wall, acting as an abutment for the spring 19, which here is illustrated as a helicoidal compression spring.
  • the channel 6, 15 traverses the chamber 12 straight in front of the spring 19 of the valve unit 10, thus, so that the flow can pass the spring.
  • the channel 7, 16 traverses in a corresponding way the chamber 11 straight in front of the spring 19 of the valve unit 9.
  • the openings 13 and 14 of the chambers 11 and 12 are normally closed by means 22, here in the form of screw plugs.
  • valve device may be utilized in connection with a gas bottle.
  • the invention is not at all restricted thereto.
  • the valve device may be used to assure a residual pressure in pressurized-fluid cylinders, through which considerable saving of energy may be achieved in comparison with the case when the pressure cylinders are evacuated completely during a return movement.
  • a pressurized-fluid cylinder e.g. an air cylinder
  • replace the gas bottle schematically indicated at 1 in the drawing and it should be understood that it is of course not necessary that the valve device 2 is applied directly on the cylinder, but there may instead be a line therebetween.
  • connection line 5, 7 a valve is connected to the connection line 5, 7 by means of which pressurized fluid with a sufficient working pressure may be delivered to the cylinder through the valve unit 10.
  • the additional valve connects the connection line 5, 7 with the environment or a suitable receiver, so that accordingly air evacutated from the cylinder passes through the valve unit 9, which assure that a residual pressure is maintained in the cylinder.
  • valve device according to the invention may also be used in other situations in such pneumatic systems, in which it is desirable to assure a residual pressure in a pressurized-fluid space, but it is desired to be able to supply pressurized fluid to the space.
  • valve chambers 11, 12 are so arranged that they emerge in the same direction on the valve body 3, which in some cases may be of advantage in the accessibility point of view.
  • the valve chambers are laterally and also axially displaced with respect to each other, so that their orifices 13, 14 on the outer side of the valve body are located at different levels.
  • the valve chamber 12 forms a part of the two flow paths through the valve body.
  • the first flow path is formed by the connection line 6, the chamber 12, the line portion 15, the chamber 11, the line portion 7a and the connection line 5.
  • the line portion 7a emerge into the bottom portion of the connection line 5 made as a hole and extends at an angle. More -exactly the line portion 7a is formed by two bores 25, 26 intersecting each other and worked from the outer side of the valve body, said bores being closed between the intersection point and the outer side of the valve body, e.g. by introducing plugs therein, which have been secured by soldering or in another way.
  • the second flow path through the valve body is formed by the connection line 5, the line portion 16a, the chamber 12 and the connection line 6.
  • the line portion 16a extends in the example at an angle between the bottom of the connection line or the hole 5 and the chamber 12, without traversing the chamber 11 as in the first embodiment.
  • the valve unit 9 is active in order to close and open, respectively, whereas the second valve unit 10 is completely inactive, so that a free flow always takes place through its chamber 12.
  • the valve unit 10 in the second flow path is active in order to close and open, respectively. Accordingly, when fluid is flowing from the space connected to the line 6 the non- return valve 9 opens, but this closes as soon as the pressure in the space has fallen below a predetermined level. However, when pressurized fluid is supplied to the space through the connection line 5 the non-return valve 10 opens.
  • connection line or the hole 5 is common to the line portion 7a and the line portion (16a), but it would of course also be possible to make the line portion 7a and the line portion 16a emerge on the outer side of the valve body 3 through separate orifices, which are together or separately connectable to suitable connection means.
  • connection line mentioned in the appended claims would be formed by two separate orifices and line sections in the valve body. Such an embodiment is comprised within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve Housings (AREA)
  • Multiple-Way Valves (AREA)
  • Lift Valve (AREA)

Abstract

Dispositif à clapet destiné à communiquer avec un espace (8) contenant un fluide sous pression, par l'intermédiaire d'un premier tube de connexion (6) et à permettre la sortie de ce fluide sous pression et la communication avec une source de fluide sous pression par l'intermédiaire d'un second tube de connexion (5). Le dispositif à clapet est disposé de manière qu'une pression résiduelle soit maintenue dans l'espace renfermant le fluide sous pression mais aussi de manière à permettre d'alimenter l'espace en fluide sous pression, lorsqu'on exerce une pression sur le second tube de connexion. Ce dispositif à clapet comprend deux clapets anti-retour (9, 10) dont l'un se ferme pour empêcher le fluide sous pression de s'écouler hors de l'espace quand la pression dans celui-ci tombe au-dessous d'un certain niveau tandis que l'autre clapet s'ouvre lorsqu'une pression s'exerce sur le second tube de connexion. Les clapets anti-retour sont placés dans deux chambres différentes (11, 12) du corps (3) du dispositif à clapet. Chacune de ces chambres est accessible de l'extérieur du corps par une ouverture (13, 14 respectivement séparée des orifices extérieurs de chacun des tubes de connexion afin de permettre respectivement la pose et la dépose, voire le réglage des clapets ou de leurs pièces par ces ouvertures.
PCT/SE1988/000427 1987-08-31 1988-08-22 Dispositif a clapet WO1989002047A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8703353-6 1987-08-31
SE8703353A SE458797B (sv) 1987-08-31 1987-08-31 Ventilanordning

Publications (1)

Publication Number Publication Date
WO1989002047A1 true WO1989002047A1 (fr) 1989-03-09

Family

ID=20369421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1988/000427 WO1989002047A1 (fr) 1987-08-31 1988-08-22 Dispositif a clapet

Country Status (3)

Country Link
EP (1) EP0421993A1 (fr)
SE (1) SE458797B (fr)
WO (1) WO1989002047A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671157A1 (fr) * 1990-12-31 1992-07-03 Belles Ondes Forges Appareil limiteur de pression.
FR2671598A1 (fr) * 1991-01-16 1992-07-17 Tilles Mecanique Robinet pour bouteilles de gaz comprimes ou liquefies.
EP1174784A1 (fr) * 2000-07-18 2002-01-23 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Robinet à détendeur intégré avec raccord unique d'entrée et sortie de fluide
CN112046530A (zh) * 2020-09-18 2020-12-08 中车青岛四方机车车辆股份有限公司 差压阀、转向架悬挂系统、轨道车辆以及压差调节方法
CN114198543A (zh) * 2020-08-31 2022-03-18 宁德时代新能源科技股份有限公司 双向泄压阀、电池以及用电装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131805A1 (de) * 1971-06-26 1972-12-28 Messer Griesheim Gmbh Ventilsystem
DE2261762A1 (de) * 1972-12-16 1974-06-20 Messer Griesheim Gmbh Ventilsystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131805A1 (de) * 1971-06-26 1972-12-28 Messer Griesheim Gmbh Ventilsystem
DE2261762A1 (de) * 1972-12-16 1974-06-20 Messer Griesheim Gmbh Ventilsystem

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671157A1 (fr) * 1990-12-31 1992-07-03 Belles Ondes Forges Appareil limiteur de pression.
EP0494557A1 (fr) * 1990-12-31 1992-07-15 Forges de Belles Ondes Appareil limiteur de pression
FR2671598A1 (fr) * 1991-01-16 1992-07-17 Tilles Mecanique Robinet pour bouteilles de gaz comprimes ou liquefies.
EP0496091A1 (fr) * 1991-01-16 1992-07-29 Luxembourg Patent Company S.A. Robinet pour bouteilles de gaz comprimés ou liquéfiés
US5232019A (en) * 1991-01-16 1993-08-03 Luxembourg Patent Company S.A. Faucet for bottles of compressed or liquefied gas
EP1174784A1 (fr) * 2000-07-18 2002-01-23 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Robinet à détendeur intégré avec raccord unique d'entrée et sortie de fluide
FR2812093A1 (fr) * 2000-07-18 2002-01-25 Air Liquide Robinet de detendeur integre avec raccord unique d'entree et sortie de fluide
CN114198543A (zh) * 2020-08-31 2022-03-18 宁德时代新能源科技股份有限公司 双向泄压阀、电池以及用电装置
US11662036B2 (en) 2020-08-31 2023-05-30 Contemporary Amperex Technology Co., Limited Bidirectional pressure relief valve, battery and electric device
CN114198543B (zh) * 2020-08-31 2023-08-08 宁德时代新能源科技股份有限公司 双向泄压阀、电池以及用电装置
CN112046530A (zh) * 2020-09-18 2020-12-08 中车青岛四方机车车辆股份有限公司 差压阀、转向架悬挂系统、轨道车辆以及压差调节方法

Also Published As

Publication number Publication date
SE458797B (sv) 1989-05-08
SE8703353D0 (sv) 1987-08-31
SE8703353L (sv) 1989-03-01
EP0421993A1 (fr) 1991-04-17

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