IE921440A1 - Thermostatic valve with electrical cut-off - Google Patents
Thermostatic valve with electrical cut-offInfo
- Publication number
- IE921440A1 IE921440A1 IE144092A IE921440A IE921440A1 IE 921440 A1 IE921440 A1 IE 921440A1 IE 144092 A IE144092 A IE 144092A IE 921440 A IE921440 A IE 921440A IE 921440 A1 IE921440 A1 IE 921440A1
- Authority
- IE
- Ireland
- Prior art keywords
- valve
- hot water
- bellows
- control element
- heating
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
- G05D23/1921—Control of temperature characterised by the use of electric means characterised by the type of controller using a thermal motor
Abstract
A hot water valve for a hot water radiator includes anaeroid bellows (6) for controlling the valve in response to the ambient air temperature, and a resistive heating element (10) for heating the bellows sufficiently to close the valve irrespective of the ambient air temperature.
Description
APPLICATION No.. SPECIFICATION FILED.
PATRICK GERARD GRAHAM, a British Subject, of 1, Brecart Road, Toomebridge, County Antrim, BT41 3TH, Northern Ireland.
- 2 ~
This invention relates to a thermostatic hot water valve.
Thermostatic hot water radiator valves, for example, hot water central heating systems, are well known and typically function by the response of a set of liquid filled anaeroid bellows to the ambient air temperature within the room to be heated. In most cases the required response temperature is set by rotating the top cover of the valve so that this action compresses the bellows to the required degree so that a further rise in temperature expands the bellows and shuts off, or restricts, the flow of heating water in the system.
There are many occasions when it is not desired to heat various rooms in the home and in this case it is tedious and laborious to have to visit each room in turn and shut off the valve setting only to later return to turn the valve back to its control setting.
It would be extremely convenient and labour saving to be able to keep each radiator thermostatic valve at some desired fixed setting and to be able to shut it off completely at each location or at some single console location.
- 3 Accordingly the present invention provides a hot water valve including an adjustable thermostatic control element responsive to the ambient air temperature, and heating means for heating the control element sufficiently to close the valve irrespective of the ambient air temperature and without disturbing the adjustment of the control element.
In an embodiment of the invention the valve comprises a conventional anaeroid bellows control element which has in intimate contact therewith a resistor element which can generate the few watts of energy needed to keep the bellows in the expanded condition so that the flow of hot water to the radiator is completely interrupted so long as the heating element is energised.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawing, which is a sectional elevation through the thermostatic valve.
The thermostatic valve comprises a valve body 1 whose valve seating IA can be closed by a seating washer 2 which is fixed to a valve stem 3. The movements of this stem 3 are determined by the equilibrium state of two distinct forces. The first force is generated by the action of a spring 4 tending to keep the valve open because of its action against a stem stop 5. The second force is a forward, or closing, force and is generated by the thermal expansion of an anaeroid bellows 6 which, via a bellows shaft 7a, pushes the valve stem forward at 7. The valve has an outer cover 8 which is mounted on the valve body 1 for rotation about the axis of the valve stem 3, in particular by means of a fixed external circumferential rib 11 on the valve body which locates in and serves as a bearing for a circumferential groove 12 on the inside surface of the outer cover 8.
The inside surface of the outer cover 8 also has a continuous spiral groove 13, which is engaged by the opposite ends of a cross-member 14, such that rotation of the outer cover 8 causes the cross-member 14 to move axially left or right relative to the valve body 1. At its centre the cross-member 14 engages one end of a bellows spring 9, and hence rotation of the outer cover 8 loads the spring 9 to an extent determined by the axial position of the cross-member 14.
Thus the valve is adjusted, that is, the control setting for a desired air temperature is obtained, by rotating the outer cover 8 to load the spring 9 of the bellows to a desired degree. It should be noted that the cross member 14 has an aperture 14a through which the bellows shaft 7a passes, so that the cross-member only engages the spring 9.
Up to this point in the description of this embodiment the valve is constructed in a similar manner to those of the prior art, but the valve additionally has an electrical cut-off control which is obtained by the incorporation of a resistive heating element 10 into the valve so that good heat transfer occurs between it and the top surface of the liquid-filled anaeroid bellows 6. The preferred resistive heating element need only dissipate a few watts, sufficient to expand the bellows 6 to close the valve irrespective of the ambient temperature, and it is preferably selected from the cheap range of cracked carbon low voltage
- 5 composition resistors which are freely available at component shops. The resistor 10 is preferably fixed directly to the top of the bellows 6, for example using a metal-based resin adhesive, and has low voltage leads
16 which passes through the top end 15 of the outer cover 8 of the valve.
To avoid the leads 16 being twisted when the temperature setting of the valve is adjusted by rotating the valve cover 8, the top end 15 is formed as a separate component to the main body of the valve cover 8 and has a circumferential edge which sits in a groove on the inside surface of the valve cover 8. By this means the top end 15 is rotatable relative to the main body of the cover 8 so that it can remain stationary as the valve cover 8 is rotated.
In use in a typical hot water central heating system, at least one radiator has a valve as described above whose resistive heating element 10 is connected across a low voltage source indicated schematically at
17, and can be switched on and off using a switch 18.
The switch may be located locally at the valve or radiator, or preferably lead back to some convenient central point where a number of like thermostatic valves associated with the radiators of the whole central heating system, can be wired into a small central console so that any valve in any room can be remotely switched on or off at will. Such wiring is inconspicuous, and the element 10 does not disturb the desired normal setting of the valve for varying ambient temperatures. In practice the low voltage supply 17 can be between 9 and 12 volts ac/dc and is easiest obtained from a good quality double insulated mains transformer with an isolated secondary winding.
Other ways of applying heat energy to the liquid filled bellows of thermostatic valves will be apparent to those skilled in the art, but the innovative principle of this invention lies in the thermal driving of the bellows or other thermostatic control element to a shut-off condition irrespective of the ambient temperature which normally is the control factor of the valve.
Claims (5)
1. A hot water valve including an adjustable thermostatic control element responsive to the ambient air temperature, and heating means for heating the 5 control element sufficiently to close the valve irrespective of the ambient air temperature and without disturbing the adjustment of the control element.
2. A hot water valve as claimed in claim 1, wherein the control element comprises an anaeroid bellows. 10
3. A hot water valve as claimed in claim 1 or 2, wherein the heating means comprises a resistive heating element.
4. A hot water valve substantially as described herein with reference to the accompanying drawing. 15
5. A central heating system with hot water radiators in which at least one radiator has a valve as claimed in any preceding claim, the system further including means for switching the heating means on and off as desired to permit overriding the thermostatic 20 control element.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB919110660A GB9110660D0 (en) | 1991-05-16 | 1991-05-16 | Thermostatic valve with electrical cut off |
Publications (1)
Publication Number | Publication Date |
---|---|
IE921440A1 true IE921440A1 (en) | 1992-11-18 |
Family
ID=10695136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE144092A IE921440A1 (en) | 1991-05-16 | 1992-07-01 | Thermostatic valve with electrical cut-off |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0678179A1 (en) |
AU (1) | AU1688792A (en) |
GB (2) | GB9110660D0 (en) |
IE (1) | IE921440A1 (en) |
WO (1) | WO1992020945A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29700501U1 (en) * | 1997-01-14 | 1997-03-20 | D & H Mechatronic Dingfelder U | Heating thermostat for regulating and controlling a room temperature |
CN1323252C (en) * | 2005-01-18 | 2007-06-27 | 广州海鸥卫浴用品股份有限公司 | Automatic temperature control heating valve |
CN103511637B (en) | 2012-06-29 | 2017-06-09 | 丹佛斯公司 | Constant temperature controlled valve |
CN103511646B (en) * | 2012-06-29 | 2018-04-17 | 丹佛斯公司 | Constant temperature Controlled valve, especially radiator valve |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1290715A (en) * | 1969-09-15 | 1972-09-27 | ||
CH562419A5 (en) * | 1972-04-14 | 1975-05-30 | Therminvent Ag | |
DE2406748A1 (en) * | 1974-02-13 | 1975-08-21 | Robionek Hans Joachim | Indoor space heating system armature - has electric heating element near expansion member connected to voltage source |
DE2625421C3 (en) * | 1976-06-05 | 1982-04-15 | Danfoss A/S, 6430 Nordborg | Thermostat attachment for a radiator valve |
FR2416507A1 (en) * | 1978-02-02 | 1979-08-31 | Pont A Mousson | METHOD AND DEVICE FOR ADDITIONAL CONTROL OF CENTRAL HEATING THERMOSTATIC VALVE |
DE3000388A1 (en) * | 1980-01-07 | 1981-07-09 | Manfred 7250 Leonberg Luik | METHOD AND DEVICE FOR IMPROVING A THERMOSTAT |
DE3500278A1 (en) * | 1985-01-05 | 1986-07-10 | Elias, Pierre, 7254 Hemmingen | Thermostat control with an expansible-material element |
-
1991
- 1991-05-16 GB GB919110660A patent/GB9110660D0/en active Pending
-
1992
- 1992-05-12 AU AU16887/92A patent/AU1688792A/en not_active Abandoned
- 1992-05-12 GB GB9210174A patent/GB2255817A/en not_active Withdrawn
- 1992-05-12 WO PCT/GB1992/000854 patent/WO1992020945A1/en not_active Application Discontinuation
- 1992-05-12 EP EP92909667A patent/EP0678179A1/en not_active Ceased
- 1992-07-01 IE IE144092A patent/IE921440A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
GB9110660D0 (en) | 1991-07-03 |
AU1688792A (en) | 1992-12-30 |
WO1992020945A1 (en) | 1992-11-26 |
GB2255817A (en) | 1992-11-18 |
EP0678179A1 (en) | 1995-10-25 |
GB9210174D0 (en) | 1992-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FC9A | Application refused sect. 31(1) |