US3480028A - Gas valve with a thermoelectric safety device - Google Patents

Gas valve with a thermoelectric safety device Download PDF

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Publication number
US3480028A
US3480028A US3480028DA US3480028A US 3480028 A US3480028 A US 3480028A US 3480028D A US3480028D A US 3480028DA US 3480028 A US3480028 A US 3480028A
Authority
US
United States
Prior art keywords
valve
latch
safety
plunger
spring
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
Application number
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English (en)
Inventor
Jan H Van Der Zee
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 Inc
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Application granted granted Critical
Publication of US3480028A publication Critical patent/US3480028A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • 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
    • G05D23/12—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
    • G05D23/125—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow
    • G05D23/126—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube
    • G05D23/127—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation
    • G05D23/128—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation the fluid being combustible
    • 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
    • Y10T137/1407—Combustion failure responsive fuel safety cut-off for burners
    • Y10T137/1516—Thermo-electric
    • 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
    • Y10T137/7723—Safety cut-off requiring reset
    • Y10T137/7724—Thermal

Definitions

  • Valves of the above-mentioned type; are broadly old in the art. Examples of such valves may be seen in United States Patents Nos. 2,988,098 and 3,099,994. These valves were designed to meet the need for exceptionally safe, so called, safe-lighting means for gas burners. Older safe-lighting valves, once the heating system had been put into operation, could be manually turned off (thereby extinguishing the pilot burner) and quickly turned on again (thereby supplying unburnt gas to the combustion chamber) before the thermocouple had time to cool down enough to cause safety shut down. An effort to immediately reignite the pilot burner, with gas having thus been supplied to the furnace, occasionally resulted in a serious explosion. The above-mentioned patented devices and this invention cannot be operated in that manner.
  • This invention is directed to a manually resettable and safe lighting gas valve with an axially movable safety valve or control member which is held open in the presence of a pilot burner flame and is closed in the absence of a flame by means of a temperature responsive safety device having a thermocouple energizable latching mechanism.
  • the latching mechanism in the gas valve permits opening of the valve only when the safety device is de-energized.
  • a separate manually operable means is provided to move the latch, to free the valve from the latch of the latching mechanism, without changing the position of the remainder of the latching mechanism.
  • FIGURE 1 is a sectional elevational view of the preferred embodiment of the invention, in its closed position;
  • FIGURE 2 is a fragmentary sectional view showing the reset plunger or shaft in its depressed or resetting position
  • FIGURE 3 is a view similar to FIGURE 2 wherein the reest plunger is in its retracted position and the safety valve is in its open position;
  • FIGURE 4 is a view similar to FIGURES 2 and 3 wherein the reset plunger is in its retracted position, the latching mechanism is being held by the thermoelectric means and the manually operable safety valve releasing plunger or shaft is depressed and is holding the latch plate and latch in their deflected 0r valve releasing positron.
  • the casing of the gas valve shown in FIGURE 1, has an inlet 2, a first outlet 4 for the main burner, and a second outlet 5 for the pilot burner. Between inlet 2 and the outlets 4 and 5 and extending through the wall 3, is a chamber or bore 37, the upper plane of which provides a seat 38 for a closing member or interrupter valve 8 and the lower plane of which provides a seat 36 for the closing member or safety valve 6. Between seats 36 and 38 the chamber 37 connects with the outlet 5 for the pilot burner (not shown).
  • the valve 6 has a coaxial bushing 18, on the free end of which is a shoulder or collar 17. Normally the bushing 18 is movably guided partially on the lower end of a manually operable resetting shaft or plunger 9 and partially on the upper end of an armature stem 10 which, in turn, is axially movable in a conventional thermoelectric safety until 11.
  • This unit is screwed into the casing 1 of the gas valve.
  • the safety unit is adapted to be connected in a well-known manner to a therrnocouple (not shown) positioned to be heated by a pilot flame.
  • the armature of the magnet (not shown) is secured to the lower end of the stem 10.
  • a generally L-shaped latching member 13 is rockably mounted in a groove 19 in the stem 10 and is biased upwardly by a spring 12.
  • Spring 12 is enough stronger than spring 7 as to move a latch 14 on the latching member to a position over the shoulder 17 when the armature is not being held by the magnet of the safety unit.
  • An arm 15 projects laterally from the latching member and into alignment with a manually operable tripping plunger 16. The upper end of this plunger is biased outwardly of the casing 1 by spring 21 bearing against a knob 26.
  • the plunger is generally parallel to the reset plunger 9, and is manually movable into engagement with the arm 15 to deflect it to the position shown in FIGURE 4 of the drawing, to free the latch 14 from engagement with the shoulder 17.
  • Spring 7 is then able to close valve 6 even if the latch is retained by the magnet.
  • the resetting plunger for the valve 6 has a knob 29 on the outwardly extending end thereof and carries an axially slidable interrupter valve 8 intermediate its ends.
  • the valve 8 is positioned between two spaced abutments 23 and 24 on the plunger 9; and an O-ring seal and spring 25, between the valve and the abutment 23, normally holds the valve against abutment 24 but permits plunger 9 to move relative to the valve 8 when the valve is seated on seat 38.
  • the system may be placed in operation by depressing knob 29.
  • the lower end of the operating shaft 9 acts on the upper end of the stem 10 and drives it against the force of the spring 12 into the safety unit 11.
  • the armature, the latch and the valve 6 are moved downwardly with stem 10 to their reset position.
  • the valve 8 on the operating shaft 9 also moves downwardly to seat 38 for closing the passage to the outlet 4 to the main burner. After closing seat 38,
  • the safety valve may be manually closed by depressing the knob 26 and moving the plunger 16 against arm or extension of the latch plate 13 and pivoting it a suflicient distance that the hook of the latch 14 disengages from the shoulder 17 on bushing 18 of valve 6.
  • the spring 12 is then free to move the valve upwardly against seat 36, as shown in FIGURE 4.
  • the plate 13 is provided with a central aperture, the diameter of which is limited in a well-known manner by means of fixed parallel spring wires (not shown) with a distance from each other corresponding to the diameter of the rod groove 19.
  • a gas valve having an inlet, a pilot burner outlet, a main burner outlet, a normally closed safety valve for controlling gas flow to said burner outlets, a normally open interrupter valve for controlling gas flow from said safety valve to the main burner, temperature responsive means for holding the safety valve open only when a pilot flame is present, a bodily movable latching means for detachably connecting said temperature responsive means and said safety valve, and manually operable reset means movable on a longitudinal axis for closing the interrupter valve and opening the safety valve and resetting said temperature responsive means;
  • said latching means comprising a first latch member operably connected to said temperature responsive means, a second latch member operably connected to said safety valve and detachably connectable with said first latch member, one of said latch members being pivoted about an axis normal to the axis-of said reset means, means biasing said one of said latch members axially with respect to said reset means, said one latch member being biased to its latch engaging position by the same means that biases said one latch member axially
  • a gas valve combination as defined in claim 5 in which said one latch member has a cam surface thereon positioned for engagement with the other latch member for temporarily deflecting said one latch member as said latch members move toward each other in a relatching operation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Safety Valves (AREA)
US3480028D 1966-03-19 1967-02-03 Gas valve with a thermoelectric safety device Expired - Lifetime US3480028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0058853 1966-03-19

Publications (1)

Publication Number Publication Date
US3480028A true US3480028A (en) 1969-11-25

Family

ID=7160313

Family Applications (1)

Application Number Title Priority Date Filing Date
US3480028D Expired - Lifetime US3480028A (en) 1966-03-19 1967-02-03 Gas valve with a thermoelectric safety device

Country Status (6)

Country Link
US (1) US3480028A (xx)
BE (1) BE695295A (xx)
DE (1) DE1529049A1 (xx)
FR (1) FR1514768A (xx)
GB (1) GB1125119A (xx)
NL (1) NL6703694A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574308A (en) * 1969-03-07 1971-04-13 Honeywell Inc Manually reset safety control
DE2605128A1 (de) * 1975-02-13 1976-09-02 Honeywell Inc Gasarmatur
US5203688A (en) * 1992-02-04 1993-04-20 Honeywell Inc. Safe gas control valve for use with standing pilot

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722945A (en) * 1951-01-20 1955-11-08 George C Gresham Safety devices for gas systems
US2962036A (en) * 1957-02-13 1960-11-29 Baso Inc Control device
US2988098A (en) * 1959-12-08 1961-06-13 Vaillant Joh Kg Manually operated gas controllers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722945A (en) * 1951-01-20 1955-11-08 George C Gresham Safety devices for gas systems
US2962036A (en) * 1957-02-13 1960-11-29 Baso Inc Control device
US2988098A (en) * 1959-12-08 1961-06-13 Vaillant Joh Kg Manually operated gas controllers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574308A (en) * 1969-03-07 1971-04-13 Honeywell Inc Manually reset safety control
DE2605128A1 (de) * 1975-02-13 1976-09-02 Honeywell Inc Gasarmatur
US5203688A (en) * 1992-02-04 1993-04-20 Honeywell Inc. Safe gas control valve for use with standing pilot

Also Published As

Publication number Publication date
FR1514768A (fr) 1968-02-23
GB1125119A (en) 1968-08-28
BE695295A (xx) 1967-08-14
NL6703694A (xx) 1967-09-20
DE1529049A1 (de) 1969-05-08

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