GB1569761A - Thermostatically-controlled valves for gas cookers - Google Patents

Thermostatically-controlled valves for gas cookers Download PDF

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Publication number
GB1569761A
GB1569761A GB862176A GB862176A GB1569761A GB 1569761 A GB1569761 A GB 1569761A GB 862176 A GB862176 A GB 862176A GB 862176 A GB862176 A GB 862176A GB 1569761 A GB1569761 A GB 1569761A
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GB
United Kingdom
Prior art keywords
passage
valve assembly
valve
gas
plug
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
GB862176A
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.)
Glynwed Domestic & Heating App
Original Assignee
Glynwed Domestic & Heating App
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 Glynwed Domestic & Heating App filed Critical Glynwed Domestic & Heating App
Priority to GB862176A priority Critical patent/GB1569761A/en
Publication of GB1569761A publication Critical patent/GB1569761A/en
Expired 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
    • F23N5/06—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bellows; using diaphragms
    • F23N5/067—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bellows; using diaphragms using mechanical means
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
    • F16K5/0207—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor with special plug arrangement, e.g. special shape or built in means
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/10—Means for additional adjustment of the rate of flow
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/10—Means for additional adjustment of the rate of flow
    • F16K5/103—Means for additional adjustment of the rate of flow specially adapted for gas valves
    • F16K5/106—Means for additional adjustment of the rate of flow specially adapted for gas valves with pilot flame
    • 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

Description

(54) IMPROVEMENTS IN THERMOSTATICALLY CONTROLLED VALVES FOR GAS COOKERS (71) We, BRIAN HARDING, a British Subject of 28 Arlington Road, West Bromwich, West Midlands B7 1 l AD, and GLYNWED DOMESTIC AND HEATING APPLIANCES LIMITED, a British Company of Headland House, Sheldon, Birmingham, do hereby declare the invention for which we pray that a Patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement:: This invention relates to thermostatically controlled valve assemblies for the ovens of gas cookers of the kind comprising a member which is rotatable in a body for controlling the quantity of gas which can flow from an inlet port in the body for connection to a supply to an outlet for connection to a burner in the oven, a valve located between the ports and controlled by a thermostat responsive to oven temperature, and a passage incorporated in the assembly which by-passes the valve and whereby gas can be supplied to, and maintain a minimum flow to, the burner to maintain a stable flame. Such assemblies are hereinafter referred to as "of the kind set forth".
In known valve assemblies of the kind set forth there is a metal-to-metal contact between the valve member of the valve and the seating with which it engages. Thus the opening and closing of the valve may be affected by the presence of foreign matter on the seating. If it is desired to adapt the valve assembly for use in an oven where the temperature of any part is to be maintained below a centre oven temperature of 100"C at 200C ambient to carry out slow cooking, it is imperative that the opening and closing of the valve is precise otherwise more gas than is necessary will be delivered and, in consequence, the temperature will rise above 1 000C and will spoil the food.
According to our invention in a thermo statically controlled valve assembly of the kind set forth for the oven of a gas cooker, the member has a passage or recess through which gas passes from the inlet port to the outlet port when the member is in an operative "ON" position, and the member is provided with a restricted passage which provides communication between the inlet and outlet ports when the member is between an "OFF" position and an adjacent first operative position.
The restricted passage provides the sole communication between the ports when the knob is moved into an "S" (i.e. slow cooking) position located between the "OFF" position and the adjacent first operative "ON" position.
Thus, in the "S" position the valve controlled by the thermostat is inoperative so that the supply to the outlet port is in no way affected by irregular operation of the valve.
The restricted passage is preferably constructed and arranged to permit a flow rate to an oven burner sufficient to maintain any part of the oven at a temperature of less than 105-C desirably 85"C to 1000C centre oven temperature at 20 C ambient. Thus the assembly is particularly suitable for incorporation into an oven as described in the Complete Specification of our co-pending Patent Application Serial No. 1 569 762 No. 8622/76, in order to carry out slow cooking.
The restricted passage may lead to the outlet port through the valve, when open, and a by-pass passage by-passing the valve and providing the said passage whereby gas is supplied to, and maintains a minimum flow to, the burner to maintain a stable flame. Preferably, however, when the restricted passage is operative it provides a flow path which leads directly to the outlet port and so by-passes the valve and, if provided, the by-pass passage.
In another construction the restricted passage may act as the said passage which by-passes the valve and whereby gas can be supplied to and maintain a minimum flow to the burner sufficient to sustain a stable flame on the burner when the thermostat switches down in response to a signal from a temperature sensitive probe.
A known thermostatically-controlled valve assembly and a thermostatically-controlled valve assembly in accordance with our invention are illustrated in the accompanying drawings in which: Figure 1 is a longitudinal section through a known valve assembly; Figure 2 is a longitudinal section through the valve assembly in accordance with our invention; and Figure 3 is a section on the line 3-3 of Figure 2.
The known thermostatically controlled valve assembly illustrated in Figure 1 of the accompanying drawings comprises a body 1 incorporating a bore 2 in which is mounted a rotatable valve member 3 in the form of a plug for regulating the supply of gas from a supply port 4 into a chamber 5 in the housing. The valve member 3 is provided with a transverse control passage or circumferentially extending recess 6 which controls the volume of gas supplied to the chamber 5 from the supply port 4. The volume supplied is increased progressively as a control knob coupled to the plug is turned to rotate the plug from say, the "lah" to the "9" graduation on the thermostat scale.
In this known construction the valve assembly acts as an "on/off" tap between the "OFF" and the "1/4" position and no flow past the plug should take place until the plug 3 reaches the "lah" position.
A thermostat 7 is located in the body 1 for controlling operation of a valve 8 for regulating the quantity of gas to be supplied to the main oven burner through an outlet connection 9 in response to a temperature sensitive probe 10.
A by-pass passage 11 by-passing the valve 8 interconnects the chamber 5 with the outlet connection 9 to provide a gas bypass sufficient to ensure a stable flame on the oven burner when the thermostat switches down in response to the temperature sensitive probe 10.
According to our invention the thermostatically controlled valve assembly of Figure 1 is modified,as shown in Figures 2 and 3, by the provision in the plug 3 of a restricted passage 12, which may be inclined with respect to a plane normal to the axis of rotation of the plug 3 and which provides communication between the inlet port 4 and the outlet connection 9 at a position downstream of the valve 8. The restricted passage 12 is separate from the recess 6 and is constructed and arranged to place the supply port 4 in communication with the outlet connection 9 as the plug is rotated from the "OFF" position to the adjacent "1/4" position irrespective of the particular position of the valve 8.
At an "S" position between the "OFF" position and the "1/4" position gas can flow from the supply port 4 into the outlet connection 9 through the restricted passage 12.
The gas flow sustains a slow cooking flame at the burner which is sufficient to maintain a centre oven temperature below 100 C at 200C ambient.
The restricted passage 12 m-ay be in addition to or replace the by-pass passage 11 in the known valve assembly described above with reference to Figure 1.
When the passage 12 is in addition to the by-pass passage 11 it may extend through the plug 3 and into the chamber 5 so that gas is then supplied from the chamber to the outlet connection 9 through the by-pass passage 11 itself and the thermostat 7 is inoperative to control gas flow.
When the by-pass passage 11 is omitted the restricted passage 12 may also be constructed and arranged to act as a by-pass connecting the supply port and outlet connection for all thermostat settings between "1/4" and "9" in order to provide a gas flow by-passing the valve sufficient to ensure a stable flame on the oven burner when the thermostat 7 switches down in response to the temperature sensitive probe 10.
In the construction described above the valve assembly acts as an "on/off" tap with a constant flow first setting in the "S" position controlled by the restricted passage 12.
WHAT WE CLAIM IS:- 1. A thermostatically-controlled valve assembly of the kind set forth for the oven of a gas cooker wherein the member has a passage or recess through which gas passes from the inlet port to the outlet port when the member is in an operative "ON" position, and the member is also provided with a restricted passage which provides communication between the inlet and outlet ports when the member is between an "OFF" position and an adjacent first operative "ON" position.
2. A valve assembly as claimed in Claim 1, in which the restricted passage provides the sole communication between the ports when the member is rotated into an "S" position located between the "OFF" position and the adjacent first operative "ON" position.
3. A valve assembly as claimed in Claim 1 or Claim 2, in which the restricted passage is constructed and arranged to permit a flow rate to an oven burner sufficient to maintain any part of the oven at a temperature of less than 100 C at 200C ambient.
4. A valve assembly as claimed in Claim 3, in which the centre oven temperature is between 85"C and 100"C at 200 ambient.
5. A valve assembly as claimed in any preceding claim in which the restricted passage leads to the outlet port through a by-pass passage and the valve, when open, the by-pass passage by-passing the valve and providing the said passage whereby gas is supplied to, and maintains a minimum flow to, the burner to maintain a stable flame.
6. A valve assembly as claimed, in any of Claims 1 to 4, in which the restricted passage leads directly to the outlet port.
7. A valve assembly' as claimed in any of
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. assembly and a thermostatically-controlled valve assembly in accordance with our invention are illustrated in the accompanying drawings in which: Figure 1 is a longitudinal section through a known valve assembly; Figure 2 is a longitudinal section through the valve assembly in accordance with our invention; and Figure 3 is a section on the line 3-3 of Figure 2. The known thermostatically controlled valve assembly illustrated in Figure 1 of the accompanying drawings comprises a body 1 incorporating a bore 2 in which is mounted a rotatable valve member 3 in the form of a plug for regulating the supply of gas from a supply port 4 into a chamber 5 in the housing. The valve member 3 is provided with a transverse control passage or circumferentially extending recess 6 which controls the volume of gas supplied to the chamber 5 from the supply port 4. The volume supplied is increased progressively as a control knob coupled to the plug is turned to rotate the plug from say, the "lah" to the "9" graduation on the thermostat scale. In this known construction the valve assembly acts as an "on/off" tap between the "OFF" and the "1/4" position and no flow past the plug should take place until the plug 3 reaches the "lah" position. A thermostat 7 is located in the body 1 for controlling operation of a valve 8 for regulating the quantity of gas to be supplied to the main oven burner through an outlet connection 9 in response to a temperature sensitive probe 10. A by-pass passage 11 by-passing the valve 8 interconnects the chamber 5 with the outlet connection 9 to provide a gas bypass sufficient to ensure a stable flame on the oven burner when the thermostat switches down in response to the temperature sensitive probe 10. According to our invention the thermostatically controlled valve assembly of Figure 1 is modified,as shown in Figures 2 and 3, by the provision in the plug 3 of a restricted passage 12, which may be inclined with respect to a plane normal to the axis of rotation of the plug 3 and which provides communication between the inlet port 4 and the outlet connection 9 at a position downstream of the valve 8. The restricted passage 12 is separate from the recess 6 and is constructed and arranged to place the supply port 4 in communication with the outlet connection 9 as the plug is rotated from the "OFF" position to the adjacent "1/4" position irrespective of the particular position of the valve 8. At an "S" position between the "OFF" position and the "1/4" position gas can flow from the supply port 4 into the outlet connection 9 through the restricted passage 12. The gas flow sustains a slow cooking flame at the burner which is sufficient to maintain a centre oven temperature below 100 C at 200C ambient. The restricted passage 12 m-ay be in addition to or replace the by-pass passage 11 in the known valve assembly described above with reference to Figure 1. When the passage 12 is in addition to the by-pass passage 11 it may extend through the plug 3 and into the chamber 5 so that gas is then supplied from the chamber to the outlet connection 9 through the by-pass passage 11 itself and the thermostat 7 is inoperative to control gas flow. When the by-pass passage 11 is omitted the restricted passage 12 may also be constructed and arranged to act as a by-pass connecting the supply port and outlet connection for all thermostat settings between "1/4" and "9" in order to provide a gas flow by-passing the valve sufficient to ensure a stable flame on the oven burner when the thermostat 7 switches down in response to the temperature sensitive probe 10. In the construction described above the valve assembly acts as an "on/off" tap with a constant flow first setting in the "S" position controlled by the restricted passage 12. WHAT WE CLAIM IS:-
1. A thermostatically-controlled valve assembly of the kind set forth for the oven of a gas cooker wherein the member has a passage or recess through which gas passes from the inlet port to the outlet port when the member is in an operative "ON" position, and the member is also provided with a restricted passage which provides communication between the inlet and outlet ports when the member is between an "OFF" position and an adjacent first operative "ON" position.
2. A valve assembly as claimed in Claim 1, in which the restricted passage provides the sole communication between the ports when the member is rotated into an "S" position located between the "OFF" position and the adjacent first operative "ON" position.
3. A valve assembly as claimed in Claim 1 or Claim 2, in which the restricted passage is constructed and arranged to permit a flow rate to an oven burner sufficient to maintain any part of the oven at a temperature of less than 100 C at 200C ambient.
4. A valve assembly as claimed in Claim 3, in which the centre oven temperature is between 85"C and 100"C at 200 ambient.
5. A valve assembly as claimed in any preceding claim in which the restricted passage leads to the outlet port through a by-pass passage and the valve, when open, the by-pass passage by-passing the valve and providing the said passage whereby gas is supplied to, and maintains a minimum flow to, the burner to maintain a stable flame.
6. A valve assembly as claimed, in any of Claims 1 to 4, in which the restricted passage leads directly to the outlet port.
7. A valve assembly' as claimed in any of
Claims 1 to 4, in which the restricted passage leads directly to the outlet port and comprises the said passage which by-passes the valve and whereby gas can be supplied to, and maintain a minimum flow to, the burner sufficient to sustain a stable flame on the burner when the thermostat switches down in response to a signal from a temperature sensitive probe.
8. A thermostaticallycontrolled valve assembly substantially as described with reference to and as illustrated in Figures 2 and 3 of the accompanying drawings.
GB862176A 1977-03-04 1977-03-04 Thermostatically-controlled valves for gas cookers Expired GB1569761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB862176A GB1569761A (en) 1977-03-04 1977-03-04 Thermostatically-controlled valves for gas cookers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB862176A GB1569761A (en) 1977-03-04 1977-03-04 Thermostatically-controlled valves for gas cookers

Publications (1)

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GB1569761A true GB1569761A (en) 1980-06-18

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GB862176A Expired GB1569761A (en) 1977-03-04 1977-03-04 Thermostatically-controlled valves for gas cookers

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8141788B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Thermostatic control device
US8931707B2 (en) 2008-02-11 2015-01-13 Marine Canada Acquisition Inc. Appliance with thermostatic controls

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8141788B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Thermostatic control device
US8141789B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Method for controlling the temperature of an appliance
US8931707B2 (en) 2008-02-11 2015-01-13 Marine Canada Acquisition Inc. Appliance with thermostatic controls

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee