EP0000806B1 - Valves de protection pour circuit de fluide sous pression - Google Patents

Valves de protection pour circuit de fluide sous pression Download PDF

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Publication number
EP0000806B1
EP0000806B1 EP78300144A EP78300144A EP0000806B1 EP 0000806 B1 EP0000806 B1 EP 0000806B1 EP 78300144 A EP78300144 A EP 78300144A EP 78300144 A EP78300144 A EP 78300144A EP 0000806 B1 EP0000806 B1 EP 0000806B1
Authority
EP
European Patent Office
Prior art keywords
valve
fluid pressure
closure member
reservoir
biassing
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.)
Expired
Application number
EP78300144A
Other languages
German (de)
English (en)
Other versions
EP0000806A1 (fr
Inventor
Robin John Dale
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.)
Honeywell UK Ltd
Original Assignee
Bendix 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 Bendix Ltd filed Critical Bendix Ltd
Publication of EP0000806A1 publication Critical patent/EP0000806A1/fr
Application granted granted Critical
Publication of EP0000806B1 publication Critical patent/EP0000806B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/28—Valves specially adapted therefor
    • B60T11/32—Automatic cut-off valves for defective pipes
    • B60T11/326—Automatic cut-off valves for defective pipes in pneumatic systems

Definitions

  • This invention relates to fluid pressure circuit protection valves especially but not exclusively for use in fluid pressure reservoir charging systems.
  • Fluid pressure reservoir charging arrangements are used extensively in road vehicle braking systems wherein it is convenient to provide charging of a plurality of reservoirs from a single source of fluid pressure, typically a compressor.
  • Such braking systems invariably have two service reservoirs for supply fluid pressure to completely independent service air brake circuits and in addition, a secondary or parking brake reservoir is usually provided on heavy vehicles for providing hold-off pressures for holding off spring brakes provided for secondary braking and parking.
  • a trailer brake reservoir will also be provided for applying fluid pressure to trailer brakes controlled by signals from the trailer.
  • charging circuit protection valves for the purposes of ensuring that if a failure occurs in the pipes or connections of a circuit connected to one reservoir, the remaining good circuits can nevertheless become charged at least to a working pressure.
  • a problem exists in such an arrangement because of possible inequality between the strength of the springs employed in such protection valves. In normal production these may vary sufficiently for a protection valve associated with a faulty or leaking reservoir to permit the loss of an air supply to such an extent that the other non-faulty circuits do not become charged.
  • the DE-A-2553818 provides in parallel with each protection valve a check valve and a restricted flow path which will always ensure that a supply of air reaches non-faulty reservoir circuits despite a small amount of inequality of the springs of the protection valves. It will be appreciated that an accumulation of some air pressure in a non-faulty reservoir then permits any relevant difference in spring forces to be overcome by the established pressure acting on the relevant area of the protection valve.
  • a fluid pressure operable fluid pressure circuit protection valve having an input port and an output port, a valve closure member engageable with a valve seat to close a connection between said ports, biassing means for biassing the closure member against the valve seat, pressure responsive means operable in response to a predetermined pressure at the input port to counteract the biassing means and unseat the closure member, characterised by the closure member having an annular resilient seating portion provided with a transverse cut, the uncounteracted biassing means biassing the closure member being operable in use to deform the transverse cut to substantively close it and increasing fluid pressure at the input port acting to progressively open the transverse cut for fluid flow to the output port prior to lifting of the closure member off the valve seat.
  • a reservoir charging arrangement for a multi-circuit brake system which by employing such a protection valve for one or some of a plurality of reservoirs to be charged from a single source, it is ensured that one or some reservoirs are normally assured of becoming charged prior to others.
  • the reservoir charging arrangement shown therein comprises a compressor to be driven by the internal combustion engine of the vehicle in which the arrangement is installed as part of the braking system.
  • the compressor denoted by reference 1 is controlled by a governor denoted by reference 2 and the output of the compressor is fed to an air dryer 3 of known form, the output of which is connected in common to the supply ports of four single circuit protection valves denoted by references 4, 5, 6 and 7.
  • These protection valves precede reservoirs 8, 9, 10 and 11.
  • the reservoirs 8 and 9 are service reservoirs, the outputs of which would be connected to respective sides of a driver's dual circuit foot valve.
  • the reservoir 10 comprises the secondary or parking air reservoir, the output of which would be to a manually operable spring and parking brake control valve in the cab of the vehicle.
  • the reservoir 11 comprises the trailer reservoir source, the output of which would be connected to trailer relay valves for providing supplies to a trailer when connected to the vehicle.
  • the protection valves 4 and 5 are valves as shown in Fig. 2. From the cutaway illustration of Fig. 2, the construction of the valve is clearly visible and it will be seen that it comprises a main body denoted by reference 21 having a supply input port 22 in a screw insert 23 providing a valve seat 31 against which a springloaded valve closure member 24 engages through its resilient seat 25. Spring biassing is provided by spring 26, the thrust of which is adjustable by a suitable screw 27 bearing against a pressure plate 28.
  • the output port is denoted by reference 29.
  • the protection valve In operation of the protection valve, when the air pressure at the supply input port attains a pressure which is sufficient to overcome the spring 26, the member 24 lifts off seat 31 and the supply pressure then acts upon the full area of the stem of 24 embraced by the sliding seal 30, holding the member 24 raised against the effect of the spring. Should a failure in the circuit which is connected to the delivery port occur, the valve closes to support a pressure typically about 0,4. 10 6 Pa (60 p.s.i.) at the input port and any remaining circuits connected to the same source of supply are assured of an air supply not less than this pressure.
  • the resilient seat 25 of the protection valve of Fig. 2 is provided as shown in Fig. 4 with a contacting upstanding annular raised portion, having a passage cut across it which for pressures somewhat below the aforesaid 0,4. 10 6 Pa (60 p.s.i.) provides a restricted flow path through the valve.
  • the cut in the resilient raised portion of the valve seat becomes progressively closed owing to the effect of the spring 26 causing compression of the resilient raised portion.
  • the valve operates to completely seal the connection between the supply port 22 and the output port 29. Since the protection valves 6 and 7 are not provided with such restricted flow paths, it is always ensured that the reservoirs 8 and 9 are charged preferentially when re-, charging of a discharged system is commencing.
  • FIG. 3 An alternative form of protection valve is shown in Fig. 3, and this is very similar to the valve of Fig. 2 with the added feature that an additional check valve with a light spring is provided within the central plunger, and now denoted by reference 34.
  • the central check valve has a resilient closure member 35 and again the upstanding annular portion of the seat 35 which bears against a hard valve seat 32 provided on the upper surface of a screw member 33, is provided with a transverse cut such that at intermediate pressures as aforesaid, a restricted flow path is provided across the check valve.
  • the reason for the added check valve in the valve of Fig. 3 is to inhibit feedback as between one reservoir and another.
  • a reservoir such as the service reservoir 8 connected to the supply via a protection valve such as shown in Fig. 2
  • the plunger 24 is raised and a loss of pressure in one or other of the other reservoirs can be replenished to a certain extent by reverse flow from the reservoir 8 to the depleted reservoir.
  • the valve of Fig. 1 In the case of the valve of Fig.
  • valves 4 and 5 of the arrangement of Fig. 1 may be of the type described with reference to Fig. 2, such as to provide the possibility of feedback, it may be desirable to provide valves not permitting feedback for the protection valves 6 and 7.
  • the question as to whether one or more of the protection valves 8, 9, 10 or 11 are required to prevent feedback will depend upon the vehicle builder requirements.
  • the protection valves 4, 5, 6 and 7 may all be constructed in a single metal casting instead of as single valves.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Claims (2)

1. Soupape de protection d'un circuit de fluide sous pression fonctionnant sous la pression du fluide, comportant un orifice d'entrée (22) et un orifice de sortie (29), un organe de fermeture à soupape (24) pouvant s'engager sur un siège de soupape (31, 32) afin de fermer un passage de raccordement entre lesdits orifices, un organe de contrainte (26) pour contraindre ledit organe de fermeture à s'appliquer sur le siège de soupape, un organe sensible à la pression fonctionnant en réponse à une pression prédéterminée à l'orifice d'entrée pour réagir contre ledit organe de contrainte et décoller l'organe de fermeture, caractérisé par le fait que l'organe de fermeture (24) comporte un siège élastique annulaire (25) muni d'une fente transversale (41), l'organe de contrainte sans réaction contraignant l'organe de fermeture pouvant fonctionner en service pour déformer la fente transversale afin essentiellement de la refermer et d'augmenter la pression du liquide à l'orifice d'entrée (22) de manière à ouvrir progressivement la fente transversale pour laisser le fluide s'écouler vers l'orifice de sortie (29) avant le décollement de l'organe de fermeture du siège de soupape (31, 32).
2. Soupape de protection, conforme à la revendication 1, caractérisée par le fait qu'elle est incorporée dans un circuit de charge de réservoir de frein de service (8) d'un circuit de freinage pour véhicule où le réservoir du frein à ressort (10) est chargé par la même source (1) par l'intermédiaire d'une soupape de protection (6) ne comportant pas ladite fente transversale, ce qui fait que le chargement du réservoir de service (8) est préférentiel.
EP78300144A 1977-08-12 1978-07-12 Valves de protection pour circuit de fluide sous pression Expired EP0000806B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3398177 1977-08-12
GB3398177 1977-08-12

Publications (2)

Publication Number Publication Date
EP0000806A1 EP0000806A1 (fr) 1979-02-21
EP0000806B1 true EP0000806B1 (fr) 1982-09-29

Family

ID=10359863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300144A Expired EP0000806B1 (fr) 1977-08-12 1978-07-12 Valves de protection pour circuit de fluide sous pression

Country Status (5)

Country Link
EP (1) EP0000806B1 (fr)
AT (1) AT377234B (fr)
DE (1) DE2862046D1 (fr)
IT (1) IT1160565B (fr)
ZA (1) ZA784085B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219448A1 (de) * 1992-06-13 1993-12-16 Wabco Westinghouse Fahrzeug Schutzsystem für eine Druckmittelanlage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502004009794D1 (de) 2004-11-15 2009-09-03 Weigert Chem Fab Verfahren zum Reinigen von Geschirr

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2138996A1 (de) * 1971-08-04 1973-02-15 Bosch Gmbh Robert Mehrkreis-schutzventil
FR2190652B1 (fr) * 1971-09-01 1976-05-07 Bosch Gmbh Robert
DE2143733B2 (de) * 1971-09-01 1975-10-09 7000 Stuttgart Mehrkreis-Schutzventil
DD101477A1 (fr) * 1972-12-15 1973-11-12
DE2355456C3 (de) * 1973-11-06 1981-09-10 Wabco Fahrzeugbremsen Gmbh, 3000 Hannover Mehrkreisschutzventil für Druckluftanlagen für Fahrzeuge, insbesondere Druckluftbremsanlagen für Straßenfahrzeuge
GB1474373A (en) * 1974-07-10 1977-05-25 Bendix Westinghouse Ltd Spring-loaded valves
DE2525146B2 (de) * 1975-06-06 1979-02-01 Graubremse Gmbh, 6900 Heidelberg Mehrkreis-Schutzventil für Bremsanlagen von Kraftfahrzeugen
DE2553818A1 (de) * 1975-11-29 1977-06-02 Wabco Westinghouse Gmbh Mehrkreis-schutzventil fuer mehrkreis- bremsanlagen in kraftfahrzeugen
DE2558844C3 (de) * 1975-12-27 1979-10-18 Graubremse Gmbh, 6900 Heidelberg Verfahren und Vorrichtung zum Versorgen einer durch ein Mehrkreis-Schutzventil abgesicherten Bremsanlage von Kraftfahrzeugen mit Druckluft
DE2639721A1 (de) * 1976-09-03 1978-03-09 Bosch Gmbh Robert Mehrkreisschutzventil fuer druckluftanlagen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219448A1 (de) * 1992-06-13 1993-12-16 Wabco Westinghouse Fahrzeug Schutzsystem für eine Druckmittelanlage

Also Published As

Publication number Publication date
ZA784085B (en) 1979-07-25
IT1160565B (it) 1987-03-11
EP0000806A1 (fr) 1979-02-21
AT377234B (de) 1985-02-25
DE2862046D1 (en) 1982-11-11
IT7868820A0 (it) 1978-07-31
ATA589578A (de) 1984-07-15

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