US3696997A - Valve repsonsive to temperature changes over a limited range - Google Patents

Valve repsonsive to temperature changes over a limited range Download PDF

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Publication number
US3696997A
US3696997A US132666A US3696997DA US3696997A US 3696997 A US3696997 A US 3696997A US 132666 A US132666 A US 132666A US 3696997D A US3696997D A US 3696997DA US 3696997 A US3696997 A US 3696997A
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US
United States
Prior art keywords
valve
core
stop
bore
casing
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 - Lifetime
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US132666A
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English (en)
Inventor
Robert T Gifford
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Vernay Laboratories Inc
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Vernay Laboratories Inc
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Publication date
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Publication of US3696997A publication Critical patent/US3696997A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/024—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being of the rod type, tube type, or of a similar type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/024—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being of the rod type, tube type, or of a similar type
    • G05D23/026—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being of the rod type, tube type, or of a similar type the sensing element being placed outside a regulating fluid flow
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/38—Needle valves

Definitions

  • ABSTRACT A fluid flow metering valve which varies effective flow area in response to temperature changes over a limited temperature range.
  • the valve core having a conically shaped end positioned in the fluid flow port, expands freely as temperature increases to a predetermined value from a temperature below that value.
  • valve assembly in which a unitary, rod-like valve member is received ina valve casing with one end of the valve member attached to the casing and the opposite end projecting outwardly thereof into a fluid flow port.
  • the diameter of the valve member is sufficiently smaller than the internal bore of the valve casing to permit the main body of the valve member to move within the casing and the materials of which the casing and valve member are constructed are selected such that the coefficient of linear thermal expansion of the valve member is appreciably greater than that of the casing.
  • valve member projects outwardly of the casing so that when the casing is attached to the wall of a member having a flow port therein through which the fluid flow is to be regulated, the outwardly projecting end of the valve member is positioned in the fluid flow port.
  • an increase in temperature will cause the valve member to expand and advance its outwardly projecting end farther into the fluid flow port. This results in a decrease in the effective flow area through the port.
  • a decrease in temperature will result in an increase in effective flow area as the valve member contracts and in this way the flow of fluid through the port is regulated in response to temperature changes.
  • the present invention provides a valve assembly which is responsive to temperature changes over a limited range of values.
  • a first value which is below some preselected temperature
  • the valve member will expand, advancing its flow regulating end farther into the flow port with which it is associated, thereby reducing the effective area of the flow port.
  • an outwardly projecting shoulder on the valve member engages an inwardly projecting shoulder on the casing within which it is mounted to prevent further advance of the conically shaped end of the valve member in any appreciable amount.
  • FIG. 1 is a view, partly in section, showing the valve assembly with the valve core thereof in a first position
  • FIG. 2 is a view similar to FIG. 1, but showing the valve core in a second position thereof;
  • FIG. 3 is a graph comparing the travel of the valve member of the present invention in response to temperature change to the travel of a valve member in which movement thereof is unrestrained.
  • a valve assembly in accordance with the present invention includes a valve casing 10 having an internal bore 11 and an externally threaded portion 12 extending from adjacent one end 14 thereof to an enlarged opposite end 16. At the end 14 of the casing a shoulder projects radially inwardly into the bore 11 to define an abutment 18 at that point. At its enlarged end 16 a shoulder or stop member 22 is defined by a portion projecting outwardly of the bore 1 1.
  • valve member or core 24 Received within the casing 10 is an elongated, unitary, rod-like valve member or core 24 having a conically shaped, fluid flow regulating end 26.
  • the valve core 24 is also provided with an outwardly projecting shoulder 28 positioned in opposition to the inwardly projecting abutment 18 of the valve casing.
  • the opposite end of the valve core 24 is provided with an enlarged head portion 30 to provide an outwardly projecting shoulder 32 positioned in opposition to the shoulder 22 of the casing 16.
  • a retainer 34 is force fitted into the enlarged open end of the casing 16 and serves to retain a spring member 36 mounted in a pocket 38 in the end of the valve member or core 24.
  • the valve assembly thus described may be readily fixed within a threaded opening of a member 40 with which it is associated by means of the external threads 12 thereof engaging complementary threads 42 formed in the wall of the member 40.
  • the casing 10 is threaded into the portion 42 of the member 40 to obtain the desired clearance between the conically shaped end 26 of the valve core 24 and the flow port 44 at a preselected temperature.
  • a coil spring 46 encircles the outwardly projecting portion of the casing 10 and bears against the member 40 at one end and the enlarged head-16 of the casing at its opthe casing within the threaded portion of the member 40.
  • the core 24 will expand, causing its conically shaped end 26 to advance farther into the flow port 44. This advance will continue as the temperature increases further until the shoulder 28 engages the abutment 18 at the preselected temperature, with additional advancement being negligible since it is caused only by the expansion of the relatively short section of the core extending from adjacent the outwardly projecting shoulder 28. Continued increase in temperature and commensurate expansion of the core 24 will be accommodated in the enlarged end 16 of the casing by movement of the head 30 in opposition to the spring member 36.
  • valve casing may be formed of a material such as steel having a coefficient of linear thermal expansion of approximately 6 X l0 I!l! .iBl![F.-L?l b9ll8h a 049, W 9"! glass filled, relatively rigid, organic polymer, such as nylon, will also function satisfactorily.
  • the material of which the core is formed must have an appreciably higher coefficient of linear thermal expansion and desirably is at least three times greater than the thermal coefficient of expansion of the valve casing.
  • various relatively rigid, organic polymers such as nylon, polyethylene, acetal resins, acrylics and polyvinylidene fluoride, have been found satisfactory.
  • the coefficient of linear thermal expansion of the core will be approximately thirteen times greater that that of the casing or shell.
  • a thermally responsive valve comprising:
  • valve casing having a first coefficient of linear thermal expansion, means defining a bore extending longitudinally of said casing,
  • valve core having a coefficient of linear thermal expansion appreciably different than that of said casing slidably received in said bore
  • stop means positioned adjacent an opposite end of said bore
  • stop engaging means of said valve core positioned in opposition to said stop means
  • said stop means comprises an enlarged portion of said bore defining an outwardly projecting shoulder.
  • said means for urging said stop engaging means into contact with said stop means comprises a spring member mounted in said enlarged portion of said bore and pushing said stop engaging means toward said stop means.
  • valve of claim 3 further comprising:
  • a retainer extending inwardly of said enlarged porb. means defining a pocket formed in said core and receiving said spring member.
  • said stop engaging means comprises an outwardly projecting head formed on one end of said core in overlying relationship to said stop means.
  • said means urging said head into engagement with said stop means comprises a spring member
  • a retainer is mounted in said bore in engagement with said spring member and in spaced relationship to said stop means to retain said spring in contact with said core.
  • valve of claim 6 further comprising:
  • a thermally responsive valve comprising:
  • valve casing having a longitudinally extending bore
  • valve core slidably received in said bore and having portions adapted to engage said abutment and stop defining means
  • said abutment and stop engaging means engage said abutment and stop, respectively, at a first temperature
  • said abutment engaging means is spaced from said abutment and said stop engaging means engages said stop at a second temperature lower than said first temperature
  • said abutment engaging means engages said abutment and said stop engaging means is spaced from said stop at a third temperature higher than said first temperature.
  • valve of claim 8 further comprising:
  • valve core being operative to vary the effective open area of said flow port over a first temperature range and relatively inoperative to vary said effective open area over a second temperature range.
  • valve of claim 8 further comprising:
  • spring means resiliently urging said head into engagement with said outwardly projecting shoulder.
  • valve casing has a relatively low coefficient of linear thermal expansion
  • said valve core has a relatively high coefficient of linear thermal expansion compared to said valve casing.
  • valve casing has a relatively low coefficient of linear thermal expansion
  • said valve core has a relatively high coefficient of linear thermal expansion compared to said valve casing.
  • valve casing has a first coefficient of linear thermal expansion
  • valve core a coefficient of linear thermal expansion appreciably different than the coefficient of linear thermal expansion of said valve casing.
  • said valve core has a coefficient of linear thermal expansion substantially greater than the coefficient of linear thermal expansion of said valve casing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Fluid Mechanics (AREA)
  • Temperature-Responsive Valves (AREA)
US132666A 1971-04-09 1971-04-09 Valve repsonsive to temperature changes over a limited range Expired - Lifetime US3696997A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13266671A 1971-04-09 1971-04-09

Publications (1)

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US3696997A true US3696997A (en) 1972-10-10

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US132666A Expired - Lifetime US3696997A (en) 1971-04-09 1971-04-09 Valve repsonsive to temperature changes over a limited range

Country Status (7)

Country Link
US (1) US3696997A (enExample)
CA (1) CA950873A (enExample)
DE (1) DE2215795A1 (enExample)
FR (1) FR2136024A5 (enExample)
GB (1) GB1376401A (enExample)
IT (1) IT949678B (enExample)
SE (1) SE380604B (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833171A (en) * 1973-07-18 1974-09-03 Vernay Laboratories Temperature responsive valve assembly
US4360481A (en) * 1980-01-28 1982-11-23 Tecumseh Products Company Fuel supply metering arrangement
US4705535A (en) * 1986-03-13 1987-11-10 The Dow Chemical Company Nozzle for achieving constant mixing energy
US4759883A (en) * 1987-03-12 1988-07-26 Walbro Corporation Temperature compensated fluid flow metering system
US5402935A (en) * 1994-02-02 1995-04-04 Northrop Grumman Corporation Variable resistance temperature compensator
US5688443A (en) * 1995-04-10 1997-11-18 Walbro Corporation Temperature compensated fluid flow metering carburetor and method
US5879594A (en) * 1997-07-10 1999-03-09 Holtzman; Barry L. Temperature responsive pressure splitter
US6003845A (en) * 1998-03-24 1999-12-21 Walbro Corporation Fuel mixture adjusting and limiting device
US20050045733A1 (en) * 2002-07-12 2005-03-03 Phipps Anthony B. Gate arrangement
US20110209769A1 (en) * 2010-03-01 2011-09-01 Chun Richard K Thermally operated valve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557922A (en) * 1977-01-13 1979-12-19 Hymatic Eng Co Ltd Cryogenic cooling apparatus
FR2577447B1 (fr) * 1985-02-15 1988-06-03 Devilbiss Toussaint Dispositif de reglage de debit par pointeau et application a un appareil de pulverisation pneumatique a reglage rapide de forme de jet
DE4042074C1 (enExample) * 1990-12-28 1992-01-09 Danfoss A/S, Nordborg, Dk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966170A (en) * 1957-07-02 1960-12-27 Otis Eng Co Temperature compensated metering valve
US3014664A (en) * 1957-12-12 1961-12-26 Garrett Corp Thermostatic snap-action valve device
US3322345A (en) * 1965-02-15 1967-05-30 Sparton Corp Temperature regulated flow control valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966170A (en) * 1957-07-02 1960-12-27 Otis Eng Co Temperature compensated metering valve
US3014664A (en) * 1957-12-12 1961-12-26 Garrett Corp Thermostatic snap-action valve device
US3322345A (en) * 1965-02-15 1967-05-30 Sparton Corp Temperature regulated flow control valve

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833171A (en) * 1973-07-18 1974-09-03 Vernay Laboratories Temperature responsive valve assembly
US4360481A (en) * 1980-01-28 1982-11-23 Tecumseh Products Company Fuel supply metering arrangement
US4705535A (en) * 1986-03-13 1987-11-10 The Dow Chemical Company Nozzle for achieving constant mixing energy
US4759883A (en) * 1987-03-12 1988-07-26 Walbro Corporation Temperature compensated fluid flow metering system
US5402935A (en) * 1994-02-02 1995-04-04 Northrop Grumman Corporation Variable resistance temperature compensator
US5688443A (en) * 1995-04-10 1997-11-18 Walbro Corporation Temperature compensated fluid flow metering carburetor and method
US5879594A (en) * 1997-07-10 1999-03-09 Holtzman; Barry L. Temperature responsive pressure splitter
US6003845A (en) * 1998-03-24 1999-12-21 Walbro Corporation Fuel mixture adjusting and limiting device
US20050045733A1 (en) * 2002-07-12 2005-03-03 Phipps Anthony B. Gate arrangement
US7086604B2 (en) * 2002-07-12 2006-08-08 Rolls-Royce Plc Gate arrangement
US20110209769A1 (en) * 2010-03-01 2011-09-01 Chun Richard K Thermally operated valve
JP2011179685A (ja) * 2010-03-01 2011-09-15 Hamilton Sundstrand Corp バルブおよびその作動方法
CN102192365A (zh) * 2010-03-01 2011-09-21 哈米尔顿森德斯特兰德公司 热操作阀
EP2366925A1 (en) * 2010-03-01 2011-09-21 Hamilton Sundstrand Corporation Thermally operated valve

Also Published As

Publication number Publication date
DE2215795A1 (de) 1972-10-19
GB1376401A (en) 1974-12-04
CA950873A (en) 1974-07-09
IT949678B (it) 1973-06-11
FR2136024A5 (enExample) 1972-12-22
SE380604B (sv) 1975-11-10

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