GB2289116A - Flow control valve assembly - Google Patents
Flow control valve assembly Download PDFInfo
- Publication number
- GB2289116A GB2289116A GB9409010A GB9409010A GB2289116A GB 2289116 A GB2289116 A GB 2289116A GB 9409010 A GB9409010 A GB 9409010A GB 9409010 A GB9409010 A GB 9409010A GB 2289116 A GB2289116 A GB 2289116A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flow
- control valve
- chamber
- flow rate
- valve
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/028—Controlling a pressure difference
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/34—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
- F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element
-
- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/14—Control of fluid pressure with auxiliary non-electric power
- G05D16/16—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
- G05D16/163—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid using membranes within the main valve
-
- 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
- G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste
- G05D23/022—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste the sensing element being placed within a regulating fluid flow
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Flow Control (AREA)
Abstract
A flow control valve assembly has a pressure compensating valve 7 for controlling flow from an inlet chamber 4 to an intermediate chamber 5 and a control valve 8 for controlling flow from the intermediate chamber 5 to an outlet chamber 6. The valve 8 is arranged for adjustable selection of the flow rate and the pressure compensating valve 7 is responsive to the pressure differential across the flow regulator 8 for maintaining the pressure differential substantially constant for a selected flow rate. The valve 8 is operable to adjust the flow rate either manually or in response to the temperature of the fluid (Figure 4, not shown). The compensating valve 7 comprises a main diaphragm valve 18 controlled by a diaphragm operated pilot valve 24. The diaphragm 19 of the pilot valve is exposed on opposite sides to the pressures upstream and downstream of the valve 8. The valve assembly is particularly for use with instantaneous water heaters for showers. <IMAGE>
Description
Flow Control Valve
This invention relates to flow control valves for regulating the flow of fluids and in particular, though not exclusively, to flow control valves for regulating the flow of water in an instantaneous water heater for ablutionary appliances such as showers.
instantaneous water heaters are known in which, for a given energy input to a heat exchanger, the outlet water temperature is controlled by adjusting the water flow rate through the heat exchanger. Usually, the energy source is electricity but other energy sources such as gas or oil may be used.
A disadvantage of instantaneous water heaters is that the water outlet temperature changes if the temperature and/or pressure of the incoming water changes and this is undesirable for showering where accurate control of temperature especially at higher showering temperatures is important to reduce the risk of accidental scalding.
Changes in temperature of the incoming water can be caused by a dead leg of water in the pipework within a house which is at a different temperature to the steady temperature of the incoming mains and by seasonal variations in the steady temperature of the incoming mains. The dead leg causes a change in water temperature shortly after the heat exchanger is turned on and seasonal temperature variations cause a change in water temperature for a given energy input to the heat exchanger. For showering this adds to the time it takes for the shower to settle down on start-up and requires a higher power setting in winter than in summer to obtain the same water outlet temperature.
Changes in pressure of the incoming water can be caused by demand from other appliances connected to the pipework in a house and by fluctuations in the pressure of the incoming mains supply. Pressure changes affect the flow rate causing a change in water temperature for a given power input to the heat exchanger. For showering this can produce sudden unexpected temperature variations for the user.
The present invention has for its object to provide a flow control valve which mitigates the above disadvantage by compensating for changes in the temperature and/or pressure of the incoming water.
According to a first aspect of the invention we provide a flow control valve for an instantaneous water heater comprising a body having an inlet chamber, an intermediate chamber and an outlet chamber, a flow regulator for controlling rate of flow from the intermediate chamber to the outlet chamber, and a pressure compensating valve for controlling flow from the inlet chamber to the intermediate chamber, the pressure compensating valve comprising a main diaphragm arranged for axial movement relative to a port connecting the inlet chamber and intermediate chamber in response to actuation of a pilot valve controlling the pressure differential across the main diaphragm by an auxiliary diaphragm responsive to the pressure differential between the intermediate chamber and the outlet chamber to maintain substantially constant the pressure differential across the flow regulator for a selected flow rate.
By maintaining a substantially constant pressure differential across the flow regulator, the selected flow rate is unaffected by pressure changes of the fluid flowing through the valve. As a result, for a given power input to a heat exchanger of an instantaneous water heater, the water temperature is maintained substantially constant.
According to a second aspect of the invention we provide a flow control valve for an instantaneous water heater comprising valve means for controlling rate of flow through a heat exchanger, the valve means being adjustable to select a desired flow rate and being responsive to the temperature of the fluid supply to adjust the selected flow rate in response to change in temperature of the fluid supply.
By adjusting the flow rate in response to temperature change of the fluid supply, the temperature to which the fluid is heated by a heat exchanger connected to the flow control valve is unaffected by the temperature of the fluid supply for a given power input to the heat exchanger.
Preferred features, benefits and advantages of the invention wiil be understood from the following description of exemplary embodiments with reference to the accompanying drawings wherein:
FIGURE 1 is a plan view of a first embodiment of a flow control valve according to the present invention;
FIGURE 2 is a section on the line 2-2 of Figure 1;
FIGURE 3 is a plan view of a second embodiment of a flow control valve according to the present invention; and
FIGURE 4 is a section on the line 4-4 of Figure 3.
The flow control valve shown in Figures 1 and 2 of the accompanying drawings comprises a plastics body 1 having an inlet 2 for connection to a mains cold water supply and an outlet 3 for connection to an heat exchanger (not shown) of an instantaneous water heater.
The body 1 is internally divided into an inlet chamber 4, an intermediate chamber 5 and an outlet chamber 6. Flow of water from the inlet chamber 4 to the intermediate chamber 5 is controlled by a pressure compensating valve 7 and from the intermediate chamber 5 to the outlet chamber 6 by a flow regulator 8.
The flow regulator 8 is adjustable to vary the flow rate to obtain a desired water temperature for a given power input to the heat exchanger and the pressure compensating valve 7 is responsive to the pressure differential across the flow regulator 8 for maintaining a selected flow rate constant.
The flow regulator 8 comprises a valve element 9 having a series of circumferentially spaced slots 10 extending axially from one end. The slots 10 are of different axial length and the valve element 9 is arranged for axial movement in an orifice 11 connecting the intermediate chamber 5 and outlet chamber 6 by rotation of a control spindle 12 to vary the number of slots 10 co-operating with the orifice 11 to adjust the flow rate.
The spindle 12 is mounted for rotation in a plastics closure cap 13 secured to the valve body 1 and has axial splines 14 at the outer end for mounting a control knob (not shown). The inner end of the spindle 12 has an external screw thread 15 engageable with an internal thread 16 of the valve element 9.
The valve element 9 is located against rotation by a plastics insert 17 received in the body 1 and secured by the closure cap 13 such that rotation of the control spindle 12 is converted to axial displacement of the valve element 9 relative to the orifice 11.
The screw pitch is chosen to give a suitable axial movement of the valve element 9 for spindle rotation to enable a range of flow rates to be obtained for less than one full turn of the control knob. The change of temperature as flow is adjusted is a non-linear characteristic and the number and length of the slots 10 is adjusted to compensate for this so that change of temperature is linear over the range of angular movement of the control knob. In this way, for a given power input to the heat exchanger, selection and setting of the water temperature by the user is facilitated.
The pressure compensating valve 7 comprises main and auxiliary diaphragms 18 and 19 retained by respective plastics cover members 20,21 secured to the body 1, for example by ultrasonic welding.
The main diaphragm 18 is arranged for axial movement relative to a port 22 in a partition 23 separating the inlet chamber 4 and intermediate chamber 5 to control water flow in response to actuation of a pilot valve 24 by the auxiliary diaphragm 19.
The main diaphragm 18 is exposed on one side to the water pressure in the inlet chamber 4 and on the other side to the water pressure in a control chamber 25 defined by the cover member 20. The control chamber 25 is connected to the inlet chamber 4 by a control hole 26 in a centre support plate 27 of the main diaphragm 18.
The auxiliary diaphragm 19 is exposed on one side to the water pressure in the intermediate chamber 5 and on the other side to the water pressure in a control chamber 28 defined by the cover member 21. The control chamber 28 is connected to the outlet chamber 6 by a through hole 29 in the body 1.
The auxiliary diaphragm 19 is coupled to a valve member 30 of the pilot valve 24 by a push rod 31 arranged to extend through the port 22 and through a pilot hole 32 in the main diaphragm 18. A spring 33 acting between the cover member 21 and a centre support plate 34 of the auxiliary diaphragm 19 biases the auxiliary diaphragm 19 in a direction to open the pilot valve 24. A weaker return spring 35 biases the valve member 30 in the opposite direction.
Movement of the pilot valve member 30 relative to the pilot hole 32 controls the water pressure in the control chamber 25 by changing the rate of escape of water through the pilot hole 32 which in turn controls the position of the main diaphragm 18 relative to the port 22 by changing the pressure differential across the main diaphragm 18. In practice, an equilibrium is established so that the main diaphragm 18 closely follows movement of the pilot valve member 30.
In operation of the flow control valve, the position of the pilot valve member 30 is controlled by the pressure differential across the auxiliary diaphragm 19 which in turn depends on the flow rate through the flow regulator 8.
For a selected flow rate to obtain a desired water temperature for a given power input to the heat exchanger, the auxiliary diaphragm 19 is adjustable in response to a change in the pressure differential between the intermediate chamber 5 and outlet chamber 6 tending to alter the flow rate to move the pilot valve member 30 to increase or decrease water flow through the port 22 to maintain the selected flow rate constant.
In this way, fluctuations in the water supply pressure are automatically compensated to prevent sudden changes in the temperature of the water provided by the heat exchanger for a given power input.
The pressure compensating valve 7 is capable of operating over a wide pressure range, for example from 0.5 bar to 10 bar, with good control characteristics due to the lack of friction in the sliding parts, the low hydrostatic pressures acting on the pilot valve 24 and the balancing of the pressure and forces across the main diaphragm 18. Also, because close sliding contact between the components are eliminated, the risk of movement failure caused by limescale build-up is considerably reduced and the components can be made from plastics mouldings rather than machined from brass.
Referring now to Figures 3 and 4, a second embodiment of a flow control valve is shown similar to the first embodiment above described in which like reference numerals are used to indicate corresponding parts.
In this second embodiment, the flow regulator 7 is replaced by a temperature responsive flow regulator 36 that is adjustable to compensate automatically for changes in temperature of the water supply to maintain constant a selected water temperature for a given power input to the heat exchanger.
The inner end of the control spindle 12 is threadably engageable with a flanged plastics bush 37 located against rotation in a pocket 38 in the underside of the closure cap 13 such that rotation of the spindle 12 is converted to axial movement of the bush 37.
A thermally responsive actuator 39 received in the valve element 9 transmits axial movement of the bush 37 to the valve element 9 which in turn co-operates with a series of circumferentially spaced axial slots 10 of different length formed in the orifice 11 to vary the flow rate from the intermediate chamber 5 to the outlet chamber 6.
The actuator 39 comprises a hollow body 40 containing a thermally responsive material such as a wax and a piston 41. The body 40 is exposed to the water in the intermediate chamber 5 by a series of circumferentially spaced holes 42 in the valve element 9 such that the projecting length of the piston 41 is adjustable in response to change in volume of the wax caused by change in temperature of the water in the intermediate chamber 5.
A spring 43 encircling the actuator 39 within the valve element 9 acts between an external flange 44 of the body 40 and a washer 45 fixed at the end of the valve element 9 to ensure that the valve element 9 closely follows change in length of the piston 41.
A further spring 46 encircling the valve element 9 acts between a plastics insert member 47 in which the orifice 11 is formed and an external flange 48 of the valve element 9 to bias the valve element 9 towards the piston 41 and adds to the bias of the spring 43. The spring 46 is chosen to have a lower rating than the spring 43 to take out backlash and hold the insert member 47 in place without overstressing any of the plastics components.
In operation, the flow regulator 36 is adjustable on rotation of the control spindle 12 to set the flow rate to obtain the desired water temperature for a given power input to the heat exchanger. If the temperature of the water supply changes, the projecting length of the piston 41 changes automatically in response to change in volume of the wax caused by the temperature change to adjust the position of the valve element 9 to alter the flow rate to compensate for the temperature change so that the temperature of the water leaving the heat exchanger remains constant.
This is achieved by constructing the actuator 39 to provide a linear response to change in temperature of the water supply such that axial movement of the piston 41 matches axial movement of the valve element 9 per unit degree change in temperature.
The temperature responsive flow regulator 36 is especially useful for compensating for the effects of change in temperature of the water supply between summer and winter. Thus, the temperature of the water supply may easily vary by as much as 200C between winter and summer. As a result, a heat exchanger having a power input to provide a shower temperature of 450C in winter will produce a shower temperature of 650C at the same setting in summer without automatic compensation for change in temperature of the water supply. It is impossible in these circumstances, even with the provision of thermal switches to prevent potentially scalding water temperatures being obtained. The best that can be achieved is to prevent very hot temperatures which could cause rapid scalds.
The temperature responsive flow regulator 36 therefore provides convenience and safety for the user by adjusting flow rates automatically so that a constant water temperature is obtained for a given power input to the heat exchanger.
It will be understood that the invention is not limited to the embodiments above-described. For example, the pressure compensating valve may be used with other flow regulators to maintain constant a selected flow rate. The temperature responsive flow regulator may be used separately or in combination with the pressure compensating valve as described or with other pressure compensating valves.
The temperature responsive flow regulator may be provided with any suitable actuator for adjusting the position of the valve element in response to the water temperature.
The temperature responsive flow regulator may be provided with axial slots of different length for adjusting flow rate as described or any other any suitable means as known to those skilled in the art.
According to another aspect, the present invention provides a flow control valve for an instantaneous water heater comprising regulator means for adjustable selection of flow rate, and control means responsive to the pressure differential across the regulator means for actuating valve means for adjusting flow to maintain substantially constant the pressure differential for a selected flow rate.
Claims (12)
1. A flow control valve for an instantaneous water heater comprising regulator means for adjustable selection of flow rate, and control means responsive to the pressure differential across the regulator means for actuating valve means for adjusting flow to maintain substantially constant the pressure differential for a selected flow rate.
2. A flow control valve according to Claim 1 comprising an inlet chamber, an intermediate chamber and an outlet chamber with the flow regulator controlling flow from the intermediate chamber to the outlet chamber and the control means being responsive to the pressure differential between the intermediate chamber and the outlet chamber for controlling flow from the inlet chamber to the intermediate chamber to maintain substantially constant the pressure differential across the flow regulator for a selected flow rate.
3. A flow control valve according to Claim 2 wherein the control means comprises a main diaphragm, an auxiliary diaphragm responsive to the pressure differential across the flow regulator and a pilot valve operatively connected to the auxiliary diaphragm for adjusting the position of the main diaphragm relative to a valve seat for controlling flow from the inlet chamber to the intermediate chamber to maintain substantially constant the pressure differential across the flow regulator for a selected flow rate.
4. A flow control valve according to any one of the preceding Claims wherein the flow regulator comprises inner and outer members arranged for relative axial movement for controlling the flow rate.
5. A flow control valve according to Claim 4 wherein one of the members has a plurality of discrete axial slots for co-operating with the other member for controlling the flow rate, and the slots have different axial lengths for adjusting the flow rate in response to the relative axial position of the members.
6. A flow control valve according to Claim 4 or Claim 5 as dependent on
Claim 4 wherein the flow regulator is responsive to the temperature of the fluid to control relative axial movement of the members to adjust the flow rate.
7. A flow control valve according to Claim 6 wherein the flow regulator has an actuator with thermally responsive material that acts on a piston operatively connected to one of the members such that change of volume of the thermally responsive material in response to change in temperature of the fluid is transmitted thereto for adjusting the relative axial position of the members to adjust the flow rate.
8. A flow control valve according to any one of the preceding Claims wherein the flow regulator has manually operable means for adjustable selection of the flow rate.
9. A flow control valve for an instantaneous water heater comprising a body having an inlet chamber, an intermediate chamber and an outlet chamber, a flow regulator for controlling rate of flow from the intermediate chamber to the outlet chamber, and a pressure compensating valve for controlling flow from the inlet chamber to the intermediate chamber, the pressure compensating valve comprising a main diaphragm arranged for axial movement relative to a port connecting the inlet chamber and intermediate chamber in response to actuation of a pilot valve controlling the pressure differential across the main diaphragm by an auxiliary diaphragm responsive to the pressure differential between the intermediate chamber and the outlet chamber to maintain substantially constant the pressure differential across the flow regulator for a selected flow rate.
10. A flow control valve for an instantaneous water heater substantially as hereinbefore described with reference to Figures 1, 2 and 3 of the accompanying drawings.
11. A flow control valve for an instantaneous water heater substantially as hereinbefore described with reference to Figures 1, 2 and 3 of the accompanying drawings as modified by Figure 4 of the accompanying drawings.
12. An instantaneous water heater provided with a flow control valve according to any one of the preceding Claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9409010A GB2289116B (en) | 1994-05-06 | 1994-05-06 | Instantaneous water heaters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9409010A GB2289116B (en) | 1994-05-06 | 1994-05-06 | Instantaneous water heaters |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9409010D0 GB9409010D0 (en) | 1994-06-22 |
| GB2289116A true GB2289116A (en) | 1995-11-08 |
| GB2289116B GB2289116B (en) | 1998-01-07 |
Family
ID=10754667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9409010A Expired - Fee Related GB2289116B (en) | 1994-05-06 | 1994-05-06 | Instantaneous water heaters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2289116B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001067197A1 (en) * | 2000-03-09 | 2001-09-13 | Danfoss Iwk Regler Gmbh | Control valve |
| FR2833676A1 (en) * | 2001-12-17 | 2003-06-20 | Mark Iv Systemes Moteurs Sa | Regulator with valve, e.g. for cooling circuit thermostat, has projecting structure round aperture in hollow housing and/or valve body |
| EP1783575A1 (en) * | 2005-11-04 | 2007-05-09 | Francel | Regulator device for the automatic regulation of the downstream pressure of a gaseous fluid |
| EP2417398A1 (en) * | 2009-02-05 | 2012-02-15 | Tour & Andersson AB | Valve with a delta p-function and a flow limiting function |
| GB2594320A (en) * | 2020-04-24 | 2021-10-27 | Xiamen Synbop Tech Co Ltd | Small water heater |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB646287A (en) * | 1943-10-26 | 1950-11-22 | Sncaso | Improvements in or relating to valve devices for maintaining a constant pressure inside a closed space more particularly in the cabin of an aircraft |
| GB907258A (en) * | 1960-10-10 | 1962-10-03 | John Arthur Eastwood | Improvements in or relating to low pressure oil burners |
| GB945876A (en) * | 1959-08-08 | 1964-01-08 | Evered & Co Ltd | Improvements relating to valves for controlling the flow of gas |
| GB1429932A (en) * | 1972-05-19 | 1976-03-31 | Evered Co Ltd | Gas flow regulating devices |
| EP0188024A1 (en) * | 1984-12-24 | 1986-07-23 | Bronkhorst High-Tech B.V. | Device for controlling the fluid flow rate through a pipe |
| GB2237860A (en) * | 1989-11-11 | 1991-05-15 | Caradon Mira Ltd | Flow control device |
| EP0522479A2 (en) * | 1991-07-11 | 1993-01-13 | G. Kromschröder Aktiengesellschaft | Gas fitting with a gas-pressure regulator |
-
1994
- 1994-05-06 GB GB9409010A patent/GB2289116B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB646287A (en) * | 1943-10-26 | 1950-11-22 | Sncaso | Improvements in or relating to valve devices for maintaining a constant pressure inside a closed space more particularly in the cabin of an aircraft |
| GB945876A (en) * | 1959-08-08 | 1964-01-08 | Evered & Co Ltd | Improvements relating to valves for controlling the flow of gas |
| GB907258A (en) * | 1960-10-10 | 1962-10-03 | John Arthur Eastwood | Improvements in or relating to low pressure oil burners |
| GB1429932A (en) * | 1972-05-19 | 1976-03-31 | Evered Co Ltd | Gas flow regulating devices |
| EP0188024A1 (en) * | 1984-12-24 | 1986-07-23 | Bronkhorst High-Tech B.V. | Device for controlling the fluid flow rate through a pipe |
| GB2237860A (en) * | 1989-11-11 | 1991-05-15 | Caradon Mira Ltd | Flow control device |
| EP0522479A2 (en) * | 1991-07-11 | 1993-01-13 | G. Kromschröder Aktiengesellschaft | Gas fitting with a gas-pressure regulator |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001067197A1 (en) * | 2000-03-09 | 2001-09-13 | Danfoss Iwk Regler Gmbh | Control valve |
| FR2833676A1 (en) * | 2001-12-17 | 2003-06-20 | Mark Iv Systemes Moteurs Sa | Regulator with valve, e.g. for cooling circuit thermostat, has projecting structure round aperture in hollow housing and/or valve body |
| WO2003052535A1 (en) * | 2001-12-17 | 2003-06-26 | Mark Iv Systemes Moteurs Societe Anonyme | Control device with a valve |
| EP1783575A1 (en) * | 2005-11-04 | 2007-05-09 | Francel | Regulator device for the automatic regulation of the downstream pressure of a gaseous fluid |
| FR2893155A1 (en) * | 2005-11-04 | 2007-05-11 | Francel Sa | DETENDER DEVICE FOR THE AUTOMATIC REGULATION OF THE DOWNSTREAM PRESSURE OF A GASEOUS FLUID |
| EP2417398A1 (en) * | 2009-02-05 | 2012-02-15 | Tour & Andersson AB | Valve with a delta p-function and a flow limiting function |
| EP2417398A4 (en) * | 2009-02-05 | 2014-02-26 | Ta Hydronics Ab | Valve with a delta p-function and a flow limiting function |
| GB2594320A (en) * | 2020-04-24 | 2021-10-27 | Xiamen Synbop Tech Co Ltd | Small water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9409010D0 (en) | 1994-06-22 |
| GB2289116B (en) | 1998-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4767052A (en) | Thermostatically self-regulating mixing valve | |
| US6042015A (en) | Fail-safe proportional mixing valve | |
| EP0783643A1 (en) | Valve for a system having a heat carrying medium | |
| GB2289116A (en) | Flow control valve assembly | |
| CA1137945A (en) | Thermostatic devices | |
| GB2071277A (en) | Water pressure regulator | |
| US4653524A (en) | Control valve assembly | |
| WO2002070930A2 (en) | Hot water temperature control valve system | |
| US3559885A (en) | Thermostatic regulating device with a synthetic thermoplastic expansion element | |
| US5427312A (en) | Thermostatic mixing valve and method of use thereof | |
| JPH0794958B2 (en) | Temperature control device for heat exchanger | |
| EP0783642B1 (en) | Valve for a system having a heat-carrying medium | |
| GB2087520A (en) | Flow regulating valve | |
| IE940121A1 (en) | Mixer | |
| JP3166881B2 (en) | Hot water mixing equipment | |
| JP3077425B2 (en) | Constant pressure hot and cold water mixing equipment | |
| US3540650A (en) | Thermostatic regulating device with a synthetic thermoplastic expansion element | |
| JP3038698B2 (en) | Electronically controlled hot and cold water mixing equipment | |
| GB2432201A (en) | Force balanced flow control device | |
| JP3039727B2 (en) | Dry battery driven electronically controlled hot and cold water mixing equipment | |
| GB2404000A (en) | Instantaneous water heater inlet control | |
| US3539101A (en) | Control arrangement for valves | |
| AU4754602A (en) | Fail-safe proportional mixing valve | |
| GB2073372A (en) | Thermostatic radiator valves and control system therefor | |
| RU2012920C1 (en) | Water temperature controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20050506 |