GB1591661A - Hot and cold water mixing valve - Google Patents

Hot and cold water mixing valve Download PDF

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Publication number
GB1591661A
GB1591661A GB3123477A GB3123477A GB1591661A GB 1591661 A GB1591661 A GB 1591661A GB 3123477 A GB3123477 A GB 3123477A GB 3123477 A GB3123477 A GB 3123477A GB 1591661 A GB1591661 A GB 1591661A
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GB
United Kingdom
Prior art keywords
water
temperature
valve
mixing chamber
mixing
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
GB3123477A
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EYNELL VALVES Ltd
Original Assignee
EYNELL VALVES Ltd
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 EYNELL VALVES Ltd filed Critical EYNELL VALVES Ltd
Priority to GB3123477A priority Critical patent/GB1591661A/en
Priority to AU38295/78A priority patent/AU3829578A/en
Publication of GB1591661A publication Critical patent/GB1591661A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
    • G05D23/1306—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids
    • G05D23/132—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element
    • G05D23/134—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element measuring the temperature of mixed fluid
    • G05D23/1346—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element measuring the temperature of mixed fluid with manual temperature setting means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Temperature-Responsive Valves (AREA)

Description

(54) HOT AND COLD WATER MIXING VALVE (71) We, MEYNELL VALVES LIMITED of Bushbury, Wolverhampton, a British Company, 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: The present invention relates to hot and cold water mixing valves especially suitable for use with instantaneous water heaters.
Instantaneous water heaters generally are connected directly to the main water supply and operate at a fixed given heat output, for example electric heaters contain, a 3 or 6 K.W. heating element. The control over water temperature is achieved by varying the flow of water through the heater, the lower the rate of flow the higher the temperature to which the water is heated.
A disadvantage apparent in using such heaters is that -.they do not compensate for the sudden and violent changes in pressure which can occur in mains water supply.
Thus, if the pressure drops suddenly at a time when a person is taking a shower bath in water heated by instantaneous water heater; he or she might be considerably discomforted by a rapid upward change in the water temperature.
We have now developed a mixing valve which is especially suitable for use with such heaters. The valve includes a body portion having an inlet for cold water from the mains and an inlet for hot water from the water heater. The hot inlet communicates with a-- mixing chamber from which there is an outlet, for example to a shower head.
The mixing chamber contains a temperature responsive element and communicates :with the cold water inlet through one or more passageways which may be closed by valuing means- position at the cold water inlet end of said. - passageways. The temperature responsive element co-operates with the valving means to open said means and allow cold water to flow into the mixing chamber when the temperature of the hot water therein exceeds a predetermined value. Externally operated means are also preferably included to allow adjustments to the temperature at which the temperature responsive device causes the valving means to open and also enables the temperature of the water in the mixing chamber to be varied below the predetermined maximum level.
Accordingly, therefore, the present invention provides a mixing valve comprising a hollow body containing an inlet for cold water, a mixing chamber formed in said hollow body and having an inlet for hot water from an external supply and an outlet for water, said chamber communicating with said cold water inlet through a passageway extending therebetween and including a valve means having open and closed positions, said valve means comprising a valve seat formed at one end of said passageway and a co-operating valve head, against which valve head resilient means acts to urge the valve means into the closed position; a temperature responsive device having a first and second end portions and located in said mixing chamber, said. first end portion being arranged to co-operate--with said valve means to urge said means into the open position to permit an increased flow of cold. water into the mixing chamber when the water.received therein from the hot water inlet excdeds - a preetermined temperature.
The invention will now be more fully -described by reference to the. accompanying drawing, which' is a diagrammatic. cróss- sectional representation of a preferred embodiment of the mixing valve of the present invention.
'The Valve comprises a body portion 1 having a cold water inlet 2 and a hot water inlet 3. Inlet 3 communicates with a mixing chamber 4 within body 1 from which there is a water outlet 5. Cold water; flowing through inlet 2 enters a chamber 6 having an outlet passageway 7 into a secondary cold water chamber 8, the other end of chamber 6 being closed by -closure member 33. A series of radially located axial passageways 9 provide means of communication between the secondary cold water chamber 8 and the mixing chamber 4. A cylinder 30 joining chambers 6, 4 and 8 and located centrally of passageway 9, contains a piston 10. A fluid-tight seal, to prevent communication between chambers 4 and 8 through cylinder 30 is maintained by O-ring 31. End 11 of the piston 10 lies in the mixing chamber 4 and end 12 in the secondary cold water chamber 8.End 11 of piston 10 has a cup portion 13 containing shoulder portions 25 in which is positioned one end 15, of a temperature responsive device 14 located in the mixing chamber 4. End portion 12 of piston 10 has a protruberance 17 which locates in cup 18 at the end of valve stem 19 of valve member 20. Valve member 20 seats on valve seat 21 formed at the end of passageway 7 and is urged against the seat by coil spring 22, the other end of which seats on closure member 33. A second coil spring 23 located between one end of the mixing chamber 4 and shoulder 25 of cup 13 urges cup 13 against end 15 of device 14. End 16 of device 14 is slidably supported in member 26 positioned at the end of mixing chamber 4. A cylindrical pin 35 integral with end 16 of device 14, contacts plunger 36 in the hollow.spindle 37 of a control knob 38.
Spindle 37 is screw-threadedly engaged in an end portion 32 of body 1. A temperature adjusting screw 39 bears on the plunger 36.
The end of hollow spindle 37 is closed by a grub screw 40 over which may be placed a cover 41 engaged in control knob 38.
The water inlet 2 communicates with a mains water supply via a T-piece 50. Pipe 51 receiving water from the mains, pipe 52 supplying water to an instantaneous water heater and pipe 53 supplying water to the cold.water inlet 2 of the mixing valve.
When the control knob 38 is in the fully open position, i.e. screwed out to the maximum extent, to allow water to leave the mixing chamber 4 at the maximum predetermined temperature, water flows along pipes 51 and 52, and is heated by the heating element of a water heater, (not shown), and then enters the mixing valve through hot water inlet 3 and passes into the mixing chamber 4. In chamber 4 the heated water contacts the temperature responsive device 14 and then flows out through outlet 5 which may be connected to a shower head for example.In the event of a sudden drop in water pressure, causing an undesirably large increase in the temperature of the water flowing from the water heater, the temperature responsive device 14 expands against piston 10, forcing it towards the valve means 20 through projection 17 and stem 19, to cause the valve head 20 to move away from the seat 21 and allow cold water to flow through passageway 7 into secondary cold water chamber 8 and thence, through passageways 9, into mixing chamber 4, where it mixes with the hot water from the heater. The resultant drop in water temperature causes the temperature responsive device 14 to contract thus allowing valve head 20 to close to a position where it allows sufficient cold water through to maintain the temperature of the water in the mixing chamber at the desired level.When the water pressure returns to normal the temperature of the water flowing into hot water inlet 3 drops causing a drop in the temperature of the water in the mixing chamber as a result of which valve head 20 is urged against its seat 21 under the influence of coil spring 22 to stop the supply of cold water to the mixing chamber.
The response to changes of water temperature in the mixing chamber 4 is extremely rapid and hence users of water taken from outlet 5 are not discomforted in any way by sudden fluctuations in the mains water pressure.
The maximum temperature of the water in the mixing chamber 4 is determined by varying the position of the adjusting screw 39. Thus, for example, with control knob 38 fully open and adjusting screw 39 screwed outwardly in spindle 37, the temperature responsive device 14 is moved away from valve head 20 under the influence of coil spring 23 bearing against shoulder 25 of cup 13, and projection 17 moves away from its seating in cup 18. As a result the water temperature in chamber 4 reaches a higher level before the temperature responsive device 14 expands sufficiently to cause valve head 20 to move away from the seat 21 to allow cold water to flow into the mixing chamber. Conversely if the adjusting screw 39 is screwed inwardly in spindle 37 the maximum temperature of the water in mixing chamber 4 is lowered.
The temperature of the water in the mixing chamber, and hence flowing through the outlet 5, can be varied below the maximum predetermined level by screwing the control knob inwardly and causing valve head 20 to move away from the seat 21 and allow cold water to flow into the mixing chamber 4. The temperature of the water will be controlled by the extent to which the valve is opened. Again if there is a marked drop in mains water pressure, the temperature of the wtaer in mixing chamber 4 will rise only to the maximum predetermined level, at which temperature the temperature responsive device 14 will expand to cause valve head 20 to open to a greater extent and allow an increased volume of water to flow into the mixing chamber.
WHAT WE CLAIM IS : 1. A mixing valve comprising, a hollow body containing an inlet for cold wtaer, a mixing chamber formed in said hollow body and having an inlet for hot water from an
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. mixing chamber 4. A cylinder 30 joining chambers 6, 4 and 8 and located centrally of passageway 9, contains a piston 10. A fluid-tight seal, to prevent communication between chambers 4 and 8 through cylinder 30 is maintained by O-ring 31. End 11 of the piston 10 lies in the mixing chamber 4 and end 12 in the secondary cold water chamber 8. End 11 of piston 10 has a cup portion 13 containing shoulder portions 25 in which is positioned one end 15, of a temperature responsive device 14 located in the mixing chamber 4. End portion 12 of piston 10 has a protruberance 17 which locates in cup 18 at the end of valve stem 19 of valve member 20. Valve member 20 seats on valve seat 21 formed at the end of passageway 7 and is urged against the seat by coil spring 22, the other end of which seats on closure member 33.A second coil spring 23 located between one end of the mixing chamber 4 and shoulder 25 of cup 13 urges cup 13 against end 15 of device 14. End 16 of device 14 is slidably supported in member 26 positioned at the end of mixing chamber 4. A cylindrical pin 35 integral with end 16 of device 14, contacts plunger 36 in the hollow.spindle 37 of a control knob 38. Spindle 37 is screw-threadedly engaged in an end portion 32 of body 1. A temperature adjusting screw 39 bears on the plunger 36. The end of hollow spindle 37 is closed by a grub screw 40 over which may be placed a cover 41 engaged in control knob 38. The water inlet 2 communicates with a mains water supply via a T-piece 50. Pipe 51 receiving water from the mains, pipe 52 supplying water to an instantaneous water heater and pipe 53 supplying water to the cold.water inlet 2 of the mixing valve. When the control knob 38 is in the fully open position, i.e. screwed out to the maximum extent, to allow water to leave the mixing chamber 4 at the maximum predetermined temperature, water flows along pipes 51 and 52, and is heated by the heating element of a water heater, (not shown), and then enters the mixing valve through hot water inlet 3 and passes into the mixing chamber 4. In chamber 4 the heated water contacts the temperature responsive device 14 and then flows out through outlet 5 which may be connected to a shower head for example.In the event of a sudden drop in water pressure, causing an undesirably large increase in the temperature of the water flowing from the water heater, the temperature responsive device 14 expands against piston 10, forcing it towards the valve means 20 through projection 17 and stem 19, to cause the valve head 20 to move away from the seat 21 and allow cold water to flow through passageway 7 into secondary cold water chamber 8 and thence, through passageways 9, into mixing chamber 4, where it mixes with the hot water from the heater. The resultant drop in water temperature causes the temperature responsive device 14 to contract thus allowing valve head 20 to close to a position where it allows sufficient cold water through to maintain the temperature of the water in the mixing chamber at the desired level.When the water pressure returns to normal the temperature of the water flowing into hot water inlet 3 drops causing a drop in the temperature of the water in the mixing chamber as a result of which valve head 20 is urged against its seat 21 under the influence of coil spring 22 to stop the supply of cold water to the mixing chamber. The response to changes of water temperature in the mixing chamber 4 is extremely rapid and hence users of water taken from outlet 5 are not discomforted in any way by sudden fluctuations in the mains water pressure. The maximum temperature of the water in the mixing chamber 4 is determined by varying the position of the adjusting screw 39. Thus, for example, with control knob 38 fully open and adjusting screw 39 screwed outwardly in spindle 37, the temperature responsive device 14 is moved away from valve head 20 under the influence of coil spring 23 bearing against shoulder 25 of cup 13, and projection 17 moves away from its seating in cup 18. As a result the water temperature in chamber 4 reaches a higher level before the temperature responsive device 14 expands sufficiently to cause valve head 20 to move away from the seat 21 to allow cold water to flow into the mixing chamber. Conversely if the adjusting screw 39 is screwed inwardly in spindle 37 the maximum temperature of the water in mixing chamber 4 is lowered. The temperature of the water in the mixing chamber, and hence flowing through the outlet 5, can be varied below the maximum predetermined level by screwing the control knob inwardly and causing valve head 20 to move away from the seat 21 and allow cold water to flow into the mixing chamber 4. The temperature of the water will be controlled by the extent to which the valve is opened. Again if there is a marked drop in mains water pressure, the temperature of the wtaer in mixing chamber 4 will rise only to the maximum predetermined level, at which temperature the temperature responsive device 14 will expand to cause valve head 20 to open to a greater extent and allow an increased volume of water to flow into the mixing chamber. WHAT WE CLAIM IS :
1. A mixing valve comprising, a hollow body containing an inlet for cold wtaer, a mixing chamber formed in said hollow body and having an inlet for hot water from an
external supply and an outlet for water, said chamber communicating with said cold water inlet through a passageway extending therebetween and including a valve means having open and closed positions, said valve means comprising a valve seat formed at one end of said passageway and cooperating valve head, against which valve head resilient means acts to urge the valve means into the closed position; a temperature responsive device having first and second end portions and located in said mixing chamber, said first end portion being arranged to co-operate with said valve means to urge said means into the open position to permit an increased flow of cold water into the mixing chamber when the water received therein from the hot water inlet exceeds a predetermined temperature.
2. A mixing valve according to claim 1 wherein said means is a spring means located in said hollow body and acting against a portion thereof.
3. A mixing valve according to claims 1 or 2 wherein said first end of said temperature responsive device co-operates with said valve means through a first plunger extending into said passageway to engage said valve head.
4. A mixing valveaccording to any one of the preceding claims wherein there is included an externally operated temperature control knob engagable with said valve means and arranged to enable said valve to assume the open position.
5. A mixing valve according to claim 4 wherein said temperature control knob includes a stem portion extending into said hollow body and is engageable with said valve means through co-operation of said stem portion with the second end portion of said temperature responsive device.
6. A mixing valve according to claim 5 wherein said stem portion of said control knob co-operates with said second end portion of said temperature responsive device via adjustable rod means screw-threadedly engaged in said stem.
7. A mixing valve according to claim 1 substantially as herein described with reference to the drawing.
GB3123477A 1977-07-26 1977-07-26 Hot and cold water mixing valve Expired GB1591661A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3123477A GB1591661A (en) 1977-07-26 1977-07-26 Hot and cold water mixing valve
AU38295/78A AU3829578A (en) 1977-07-26 1978-07-24 Hot and cold water mixing valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3123477A GB1591661A (en) 1977-07-26 1977-07-26 Hot and cold water mixing valve

Publications (1)

Publication Number Publication Date
GB1591661A true GB1591661A (en) 1981-06-24

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ID=10320058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3123477A Expired GB1591661A (en) 1977-07-26 1977-07-26 Hot and cold water mixing valve

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Country Link
AU (1) AU3829578A (en)
GB (1) GB1591661A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0824728A1 (en) * 1995-05-10 1998-02-25 Masco Corporation A thermostatic faucet mixing valve
EP0973083A2 (en) * 1998-07-13 2000-01-19 Friedrich Grohe Aktiengesellschaft Sanitary mixing valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0824728A1 (en) * 1995-05-10 1998-02-25 Masco Corporation A thermostatic faucet mixing valve
EP0824728A4 (en) * 1995-05-10 2000-04-26 Masco Corp A thermostatic faucet mixing valve
CN1109944C (en) * 1995-05-10 2003-05-28 马斯科工业公司 Thermostatic faucet mixing valve
EP0973083A2 (en) * 1998-07-13 2000-01-19 Friedrich Grohe Aktiengesellschaft Sanitary mixing valve
EP0973083A3 (en) * 1998-07-13 2001-03-07 Friedrich Grohe AG & Co. KG Sanitary mixing valve

Also Published As

Publication number Publication date
AU3829578A (en) 1980-01-31

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CSNS Application of which complete specification have been accepted and published, but patent is not sealed