US10890267B2 - Pressure-limiting valve - Google Patents

Pressure-limiting valve Download PDF

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Publication number
US10890267B2
US10890267B2 US15/535,780 US201515535780A US10890267B2 US 10890267 B2 US10890267 B2 US 10890267B2 US 201515535780 A US201515535780 A US 201515535780A US 10890267 B2 US10890267 B2 US 10890267B2
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US
United States
Prior art keywords
pressure
spring
closing element
receptacle
valve seat
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Active
Application number
US15/535,780
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English (en)
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US20190093782A1 (en
Inventor
Holger Muehlhoff
Robert Schloeder
Dieter Born
Wasilij Schieder
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
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Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHIEDER, WASILIJ, BORN, DIETER, MUEHLOFF, HOLGER, SCHLOEDER, ROBERT
Publication of US20190093782A1 publication Critical patent/US20190093782A1/en
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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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • 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
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0466—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with a special seating surface
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • 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
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7738—Pop valves
    • Y10T137/774—Pop pressure reactor in inflow to valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type

Definitions

  • the disclosure relates to a pressure-limiting valve.
  • the housing is normally composed of steel, in particular of a solid steel block, wherein receptacles for pressure adjustment devices and pressure medium ducts have to be drilled in the housing.
  • receptacles for pressure adjustment devices and pressure medium ducts have to be drilled in the housing.
  • DE 10 2004 040 359 B4 has disclosed a general pressure-regulating fitting, the housing of which is produced by means of a casting process. During the production of the housing, required pressure medium ducts and receptacles can duly be produced concomitantly in an inexpensive manner, but the fitting disclosed in said document has a very large space requirement not least owing to a valve seat that is accessible from both sides. Said accessibility to the valve seat is however necessary for the work hardening method disclosed in said document for hardening of the valve seat, firstly in order to perform the work hardening using suitable tools but also in order to permit cutting finish machining using suitable tools such as for example milling cutters, such as is required after the work hardening in order to ensure the dimensional accuracy of the valve seat.
  • a pressure-limiting valve comprises a housing and a valve seat which is formed in the housing and which can be closed by means of a spring-loaded closing element of the pressure-limiting valve.
  • the housing is composed of cast iron with spheroidal graphite, in particular GGG or GJS—referred to as “nodular graphite iron”, wherein the housing is surface-hardened at least in a region of the valve seat.
  • Surface hardening comprises hardening methods such as for example induction hardening, laser hardening or flame hardening.
  • An advantage of the pressure-limiting valve according to the disclosure is that pressure medium ducts and other receptacles are formed during the casting of the housing and do not need to be produced by cutting machining after the completion of the housing, wherein surface hardening is an inexpensive hardening method because, owing to the good dimensional accuracy, cutting finish machining is normally not necessary, or is at least kept within narrow limits, and thus tool usage is reduced.
  • the housing is advantageously produced using a precision or investment casting method such as for example a lost wax method, in particular using a wax model encased in flame-resistant mold material. In this way, increased dimensional accuracy can be achieved which reduces tool usage for cutting finish machining. It is furthermore for example possible to use sand cores, produced from sand and phenol resin, and so-called printed cores, produced from plastic by rapid prototyping and/or rapid manufacturing methods.
  • the housing there is provided at least one receptacle, formed in particular in the manner of a blind hole, in which the pressure adjustment device is at least partially arranged, wherein the receptacle comprises the valve seat.
  • the receptacle comprises the valve seat.
  • the receptacle is preferably of approximately rotationally symmetrical form. In this way, it is in particular possible for rotating tools to be introduced into the receptacle, for example for any reworking of the valve seat that may be required before or after the surface hardening. Furthermore, it is thus possible for a thread to be formed into the receptacle, by means of which thread the pressure adjustment device can be fastened in the receptacle. It is furthermore preferable for the receptacle to be formed as a recess in the housing.
  • the valve seat is advantageously arranged approximately in a closing direction of the closing element proceeding from the pressure adjustment device. In this way, it is furthermore possible to achieve compact and space-saving design of the pressure-limiting valve.
  • the abovementioned surface hardening has not only the advantages mentioned above but also the advantage that, owing to the thus reduced tool usage for the finish machining, a considerably more compact and space-saving arrangement in particular of the pressure adjustment device and of the receptacle in the housing can be selected.
  • the valve seat can be arranged so as to be accessible only from a single side, in particular via the receptacle, in particular substantially in the closing direction of the closing element, for the surface hardening, in particular by means of a tool, and/or for finish machining by means of a tool.
  • the closing element advantageously has a closing cone, a guide piston being arranged on the closing element in the closing direction proceeding from said closing cone.
  • the closing cone in particular a contact surface of the closing cone, is in contact with the valve seat when the closing element is in a closed state.
  • the closing element and the guide piston are advantageously of single-part form.
  • a spring plate of the pressure adjustment device prefferably arranged on, in particular adjacent to, the closing element counter to the closing direction proceeding from the closing cone.
  • the closing element and the spring plate may be in single-part or multi-part form.
  • a transition of the receptacle between the spring plate and the valve seat is advantageously at least partially of conical form.
  • the transition from a region of the spring plate in a closed position of the closing element to the valve seat is of at least partially conically tapering form.
  • fastening recesses are preferably formed as through-holes for the fastening of the pressure-limiting valve in a simple manner, for example by means of through-bolts.
  • the spring plate is furthermore preferable for the spring plate to be of conically tapering form in a closing direction at a section which projects beyond a spring of the pressure adjustment device.
  • the diameter of the receptacle may decrease in the closing direction, in particular in stepped and/or continuous fashion.
  • the pressure-limiting valve is preferably formed in the manner of an intermediate plate, wherein the housing advantageously has two abutment surfaces which are plane-parallel with respect to one another.
  • the pressure-limiting valve is preferably directly controlled, which further promotes a compact and space-saving design of the pressure-limiting valve according to the disclosure.
  • two receptacles which are arranged substantially mirror-symmetrically with respect to one another to be provided in the housing.
  • a pressure adjustment device is arranged at least partially in each of the receptacles.
  • the valve seat is provided in each of the receptacles.
  • FIG. 1 shows, in a longitudinal section, a front view of a pressure-limiting valve according to the disclosure as per a first exemplary embodiment
  • FIG. 2 shows, in a longitudinal section, a front view of a pressure-limiting valve according to the disclosure as per a second exemplary embodiment.
  • the first exemplary embodiment of a pressure-limiting valve 1 according to the disclosure as illustrated in FIG. 1 comprises a housing 2 in which there is provided a receptacle 4 for a pressure adjustment device 6 which is provided in the housing 2 .
  • the pressure adjustment device 6 comprises a reduction piece 8 , a spring 10 that can be preloaded therein, and a spring plate 12 .
  • the spring plate 12 is formed as one part with a spring-loaded closing element 14 , which has a closing cone 16 and a guide piston 18 in a closing direction 24 proceeding from the spring plate 12 .
  • the reduction piece 8 is screwed into the receptacle 4 , wherein an internal thread is provided in the receptacle 4 and a corresponding external thread is provided on the reduction piece 8 .
  • the receptacle 4 comprises a valve seat 20 and a transition 22 from a region of the spring plate 12 in a closed position of the closing element 14 to the valve seat 20 .
  • the housing 2 is surface-hardened in order to permanently ensure a sealing function between valve seat 20 and closing cone 16 and thus increase a service life of the pressure-limiting valve.
  • the closing element 14 is preloaded in its closing direction 24 against the valve seat 20 by means of the spring 10 .
  • the transition 22 is formed so as to taper conically in the closing direction 24 .
  • the spring plate 12 is, at its section which projects beyond the spring 10 , formed so as to taper conically in the closing direction 24 .
  • the transition 22 to the valve seat is arranged in the closing direction 24 of the closing element 14 , and further in the closing direction 24 , the guide piston 18 is arranged in the receptacle 4 .
  • the closing cone 16 is in contact, by means of a contact surface, with the valve seat 20 , and seals off a high-pressure side with respect to a low-pressure side.
  • a rod section of the closing element 14 with a reduced diameter in relation to the guide piston 18 and/or the contact surface of the closing cone 16 .
  • the rod section delimits a ring-shaped chamber 26
  • the guide piston 18 delimits a piston chamber 28 , wherein a ring-shaped gap is provided between guide piston 18 and receptacle 4 .
  • the ring-shaped gap serves for pressure medium equalization between the ring-shaped chamber 26 and the piston chamber 28 as soon as the closing element moves in the receptacle.
  • the size of the ring-shaped gap determines a degree of damping with which the movement of the closing element 14 in the receptacle 4 is dampened, because the interaction between spring 10 and closing element 14 , in particular with the spring plate 12 , constitutes in physical terms a spring/mass system which could otherwise oscillate in undampened fashion.
  • a high pressure prevails in the ring-shaped chamber 26 and in the piston chamber 28 , and a low pressure prevails in a pressure medium chamber 30 which is arranged adjacent to the valve seat 22 counter to the closing direction 24 . If the high pressure in interaction with the closing element 14 exceeds a value which corresponds to the equivalent of the spring 10 , the closing element 14 is lifted with its closing cone 16 from the valve seat 20 counter to the closing direction 24 , and pressure medium can flow out via the pressure medium chamber 30 into a pressure medium sink (not illustrated). The high pressure is thus limited to the value that corresponds to the equivalent of the spring 10 , wherein the value is settable or adjustable.
  • two pressure adjustment devices 6 with a respectively associated receptacle 4 are arranged in substantially mirror-symmetrical fashion in the housing 2 .
  • the receptacles 4 illustrated in the second exemplary embodiment correspond to the receptacle 4 of the first exemplary embodiment as shown in FIG. 1 and described above.
  • the pressure adjustment devices 6 used in the second exemplary embodiment substantially correspond to the pressure adjustment device 6 of the first exemplary embodiment as shown in FIG. 1 and described above, wherein two different variants of closing elements 14 and spring plates 12 of multi-part design are illustrated. These different variants will be described below.
  • the spring plate 12 and the closing element 14 are of multi-part form, such that a spherical end section of the closing element 14 comes into contact with a correspondingly formed counterpart surface of the spring plate 12 . In this way, it is advantageously possible for alignment errors between the spring 10 or the spring plate 12 and the closing element 14 to be compensated.
  • the spring plate 12 and the closing element 14 are of multi-part form such that a cylindrical end section of the closing element 14 comes into contact with a correspondingly formed counterpart surface of the spring plate 12 .
  • the spring plate 12 is of approximately hat-shaped form. In this way, the closing element 14 can be guided with its cylindrical end section in the spring plate 12 in an effective manner.
  • the disclosure discloses a pressure-limiting valve having a cast housing, the valve seat of which is surface-hardened.
  • the advantage of inexpensive production of the housing with internal pressure medium ducts receptacles, in particular for a pressure adjustment device, combined with the advantage of a long-term sealing function, is ensured by means of a method which can be carried out in a reliable manner and which, owing to its good dimensional accuracy, requires only reduced finish machining, if any.
  • a more compact and thus space-saving arrangement of functional regions accommodated in the housing, in particular of a pressure adjustment device and of an associated receptacle is made possible.
  • a valve seat can be arranged so as to be accessible only from a single side, in particular substantially in a closing direction of the closing element, for the surface hardening and/or for finish machining by means of a tool.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Safety Valves (AREA)
US15/535,780 2014-12-16 2015-12-16 Pressure-limiting valve Active US10890267B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102014225983 2014-12-16
DE102014225983.5 2014-12-16
DE102014225983.5A DE102014225983A1 (de) 2014-12-16 2014-12-16 Druckbegrenzungsventil
PCT/EP2015/080020 WO2016097000A1 (fr) 2014-12-16 2015-12-16 Soupape de limitation de pression

Publications (2)

Publication Number Publication Date
US20190093782A1 US20190093782A1 (en) 2019-03-28
US10890267B2 true US10890267B2 (en) 2021-01-12

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ID=55024111

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/535,780 Active US10890267B2 (en) 2014-12-16 2015-12-16 Pressure-limiting valve

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Country Link
US (1) US10890267B2 (fr)
EP (1) EP3234426B1 (fr)
CN (1) CN107002897B (fr)
DE (1) DE102014225983A1 (fr)
PL (1) PL3234426T3 (fr)
WO (1) WO2016097000A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578046A (en) * 1924-02-16 1926-03-23 Logan Henry Havelock Safety valve for hot-water heaters
US2071749A (en) * 1936-02-20 1937-02-23 Gen Fire Extinguisher Co Valve
US2227629A (en) * 1937-12-14 1941-01-07 Bliss E W Co Pressure control valve and the like
US2256365A (en) * 1941-04-29 1941-09-16 Foster Engineering Co Dual relief valve
EP0698757A2 (fr) 1994-08-23 1996-02-28 Johnson Service Company Procédé de fabrication en série de robinets
DE19644356A1 (de) 1996-10-25 1998-04-30 Baelz Gmbh Helmut Sitzventil mit eingegossenem Ventilsitz
DE19804752A1 (de) 1998-02-06 1999-08-12 Mannesmann Rexroth Ag Sitzventil
CN1740613A (zh) 2004-08-20 2006-03-01 赫尔穆特巴尔兹股份有限公司 调节配件
CN2839690Y (zh) 2005-07-22 2006-11-22 上海立新液压有限公司 叠加式溢流阀
US7255328B2 (en) * 2004-08-27 2007-08-14 Vetco Gray Inc. Low friction coatings for dynamically engaging load bearing surfaces
US20180223879A1 (en) * 2015-07-28 2018-08-09 Poclain Hydraulics Industrie Pressure limiting device, in particular for an assist system for vehicles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524980A (en) * 1978-08-14 1980-02-22 Mitsubishi Heavy Ind Ltd Cast iron and spheroidal graphite cast iron surface hardening
CN2786395Y (zh) * 2005-04-07 2006-06-07 王新民 一种异型薄壁阀门
EP2463391A1 (fr) * 2010-12-09 2012-06-13 Perkins Engines Company Limited Composant durci par induction et comprenant un trou non-durci
CN202612661U (zh) * 2012-01-19 2012-12-19 新昌县利永达制冷机械有限公司 球墨铸铁空调截止阀

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578046A (en) * 1924-02-16 1926-03-23 Logan Henry Havelock Safety valve for hot-water heaters
US2071749A (en) * 1936-02-20 1937-02-23 Gen Fire Extinguisher Co Valve
US2227629A (en) * 1937-12-14 1941-01-07 Bliss E W Co Pressure control valve and the like
US2256365A (en) * 1941-04-29 1941-09-16 Foster Engineering Co Dual relief valve
US5826336A (en) * 1994-08-23 1998-10-27 Johnson Service Company Process for the production of series-produced valves used in heating, ventilating and air-conditioning systems
EP0698757A2 (fr) 1994-08-23 1996-02-28 Johnson Service Company Procédé de fabrication en série de robinets
DE19644356A1 (de) 1996-10-25 1998-04-30 Baelz Gmbh Helmut Sitzventil mit eingegossenem Ventilsitz
DE19804752A1 (de) 1998-02-06 1999-08-12 Mannesmann Rexroth Ag Sitzventil
CN1740613A (zh) 2004-08-20 2006-03-01 赫尔穆特巴尔兹股份有限公司 调节配件
DE102004040359B4 (de) 2004-08-20 2011-06-16 Helmut Bälz GmbH Regelarmatur
US7255328B2 (en) * 2004-08-27 2007-08-14 Vetco Gray Inc. Low friction coatings for dynamically engaging load bearing surfaces
CN2839690Y (zh) 2005-07-22 2006-11-22 上海立新液压有限公司 叠加式溢流阀
US20180223879A1 (en) * 2015-07-28 2018-08-09 Poclain Hydraulics Industrie Pressure limiting device, in particular for an assist system for vehicles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
International Search Report corresponding to PCT Application No. PCT/EP2015/080020, dated Feb. 10, 2017 (German and English language document) (6 pages).

Also Published As

Publication number Publication date
DE102014225983A1 (de) 2016-06-16
CN107002897A (zh) 2017-08-01
US20190093782A1 (en) 2019-03-28
CN107002897B (zh) 2021-08-03
EP3234426B1 (fr) 2019-06-26
WO2016097000A1 (fr) 2016-06-23
EP3234426A1 (fr) 2017-10-25
WO2016097000A9 (fr) 2017-03-30
PL3234426T3 (pl) 2019-11-29

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