GB2454065A - Valve assembly for water heaters - Google Patents

Valve assembly for water heaters Download PDF

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Publication number
GB2454065A
GB2454065A GB0817625A GB0817625A GB2454065A GB 2454065 A GB2454065 A GB 2454065A GB 0817625 A GB0817625 A GB 0817625A GB 0817625 A GB0817625 A GB 0817625A GB 2454065 A GB2454065 A GB 2454065A
Authority
GB
United Kingdom
Prior art keywords
valve
inlet
piston
drain
control chamber
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.)
Withdrawn
Application number
GB0817625A
Other versions
GB0817625D0 (en
Inventor
Willi Hecking
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.)
Hans Sasserath GmbH and Co KG
Original Assignee
Hans Sasserath GmbH and Co KG
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 Hans Sasserath GmbH and Co KG filed Critical Hans Sasserath GmbH and Co KG
Publication of GB0817625D0 publication Critical patent/GB0817625D0/en
Publication of GB2454065A publication Critical patent/GB2454065A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16K19/00—Arrangements of valves and flow lines specially adapted for mixing fluids
    • F16K19/003—Specially adapted for boilers
    • 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
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/08—Arrangements for drainage, venting or aerating
    • F24D19/082—Arrangements for drainage, venting or aerating for water heating systems
    • F24D19/083—Venting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F24D3/1016—Tanks having a bladder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1083—Filling valves or arrangements for filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
    • F24H9/133—Storage heaters
    • F24H9/136—Arrangement of inlet valves used therewith

Abstract

A valve assembly for water heaters having a boiler provided with an air cushion for compensating pressure variations comprises a housing with an inlet (18, Fig. 1), an outlet (20, Fig. 1) and a drain (36, Fig. 1) between the inlet and the outlet. A spring-biased piston between the inlet and outlet has a piston shaft 46 having two spaced apart plates 66, 70 with a different effective area, the piston defining a control chamber 88 in a bore 44 of the housing. A valve plate 48 is provided on the piston shaft for a drain valve (32, Fig. 1). A further valve plate 56 on the piston shaft forms a stop valve (30, Fig. 1) with the housing for blocking the passage (42, Fig. 1) between the inlet and outlet if the drain valve is open. An auxiliary valve 96 controlling the passages 90, 92, 94 between the control chamber 88 and the inlet is controlled by a pressure sensor (40, Fig. 1) connected to a water reservoir. An inlet pressure is present in the control chamber if the auxiliary valve is opened and the piston is moved against the spring in the opening direction of the drain valve; the control chamber is vented if the auxiliary valve is closed so that the drain valve is closed.

Description

VALVE ASSEMBLY FOR WATER HEATERS
Technical Field
The Invention relates to a valve assembly for water heaters having a boiler provided with an air cushion for compensating pressure vanations.
Warm water heaters serve to heat up drinking water. Water contained in a boiler is heated by, for example, a heating coil. The water is thereby expanded. This causes a pressure increase in the boiler.
Prior Art
There are water heaters known having a boiler which is provided with an air cushion to compensate pressure vanations. Such a water heater is filled with water up to a given level. A heating coil is present in the water. An air volume is provided above the water. If the water is expanded due to heating it exerts a pressure on the air volume. Due to the reduction of the volume of the air volume the overall pressure in the boiler is increased only by a small amount. The advantage of such an assembly is that expansion water must not be drained and wasted.
In order to avoid turbulences causing the entrainment of air in the outlet a floater is provided on the water in the boiler. However, the amount of air is reduced with time.
Known boilers of such kind must, therefore, be regularly manually blocked off and vented in order to achieve a sufficiently large air volume. This is time consuming and requires some efforts.
Disclosure of the invention
It is an object of the invention to provide a fitting enabling the easy refilling of such an air volume. According to the invention this object is achieved by a valve assembly of the above mentioned kind, comprising: (a) a housing with an inlet, an outlet and a drain arranged between the inlet and the outlet; (b) a spnng-biased piston arranged between the inlet and the outlet, the piston having a piston shaft provided with two spaced apart plates with a different effective area, the piston defining a control chamber in a bore of the house between these plates; (c) a valve plate provided at the piston for a drain valve at the drain; (d) a further valve plate provided at the piston shaft, which forms a stop valve with the housing for blocking the passage between the inlet and the outlet if the drain valve is open; and (e) an auxiliary valve controlling the passage between the control chamber and the inlet and which is adapted to be controlled by a pressure sensor connected to the water reservoir such that (f) an inlet pressure is present in the control chamber if the auxiliary valve is opened and the piston is moved against the spnng power in the opening direction of the drain valve and that the control chamber is vented if the auxiliary valve is closed so that the drain valve is closed.
The valve assembly according to the invention enables to upgrade existing boilers without the need to use expensive expansion tanks or the like. The control chamber is formed by two plates with different effective area. This means that a pressure change will cause the piston to move until an equilibrium of the forces is achieved. If the pressure in the control chamber is increased the piston is moved in the direction of the plate with the larger effective area. If the pressure in the control chamber is decreased the piston is moved in the opposite direction of the plate with the smaller effective area. The inlet pressure in the control chamber which is higher than the atmospheric pressure causes the piston to move against the spring power in the opening direction of the drain. Then the drain valve is opened. On the other hand, the drain valve is closed if the control chamber is vented.
The inlet pressure is applied in the control chamber by opening a passage between the inlet and the control chamber with an auxiliary valve, especially a magnetic valve. The passage between the inlet and the outlet is closed with a further valve plate due to the piston movement caused thereby before the drain valve is opened upon continued movement of the piston.
The magnetic valve is preferably opened if the pressure change determined by a pressure sensor caused by heating for a given temperature interval increases a threshold value. The increased pressure change is caused by a smaller air volume. The control can be effected in such a way that the point in time for venting is chosen such that no water is taken. This is typically the case during the night. The time is determined such that dunng a certain time no temperature-and/or pressure change occurs. In such a way the function of the water heater is not affected. Preferably the magnetic valve is arranged in the valve chamber with a venting opening and the magnetic valve releases the venting opening for venting the control chamber if the passage between the control chamber and the inlet is blocked by the magnetic valve.
Furthermore a safety valve can be arranged between the passage valve and the outlet.
Furthermore a backflow preventer can be provided in the inlet. The drain valve can be a valve with an inclined seat. This means that the direction of the movement of the piston forms an angle of, for example, 45 degrees with the passage axis between the inlet and the outlet.
Further modifications of the invention are subject matter of the subclaims. An embodiment of the invention is described below in greater detail with reference to the accompanying drawings.
Brief description of the drawings
Fig.1 is a cross sectional view of a valve assembly for venting a boiler of a water heater in an operating position.
Fig. 2 is a cross sectional view of the valve assembly of Fig.! in a venting position.
Fig. 3 is a detail of Fig.1.
Fig.4 isadetailofFig.2.
Fig. 5 is a cross sectional view of a valve assembly for venting a boiler in a water heater in a transitional position.
Fig. 6 is a schematic view of the valve assembly with a water heater and venting.
Detailed description of the embodiment
Figure 1 shows a fitting generally denoted with numeral 10 for the partial draining (venting) of a boiler with an air cushion. the fitting 10 comprises a housing 12 and an inlet socket 14 and an outlet socket 16 which is in alignment with the inlet socket 14. The inlet socket 14 is connected to a dnnking water supply which is not shown in this drawing.
Accordingly, there is inlet pressure in the inlet 18. The outlet socket 16 is connected to the boiler of a water heater (not shown). Accordingly there is the same pressure in the outlet as in the boiler of the water heater.
A further socket 22 is provided at the outlet 20. A safety valve 24 is connected to the socket 22. Such safety valves 24 are generally known and, therefore, need not be descnbed here in greater detail. A backflow preventer 26 in the form of a backflow preventer cartndge is provided in the housing 12 downstream of the inlet. The hackflow preventer 26 opens in the direction of the water heater.
A combined passage valve 30 and a drain valve 32 are provided with an angle of 45° relative to the longitudinal axis between the inlet 18 and the outlet 20. The drain valve 32 is provided at a curved drain socket 34 which is screwed to a drain hopper 36. A pressure sensor 40 is arranged laterally to the drain socket at the housing 12. The passage valve 30 is arranged in a passage bore 42 formed by the housing 12 and which is aligned with the inlet 18 and the outlet 20.
Figure 1 shows the outlet valve 32 in a closed position where the passage valve 30 is opened. This is the operating position. Water can flow into the water heater if it is tapped.
Figure 2 shows the drain valve 32 in an open position where the passage valve is closed.
Then water can be drained from the boiler in order to increase the air cushion in the boiler.
Figure 3 and Figure 4 show enlarged sections of the valve assembly with open and closed drain valve, respectively, which shall be used to further explain below their way of operating.
The housing 12 defines a bore 44 as shown in the drawings, which has an angle of 45° relative to the longitudinal axis of the passage bore 42. A multiple piston 46 is shiftably guided in the bore 44. The bore 44 ends in the drain socket 34 on its lower end in Fig.3.
The multiple piston 46 is provided with a valve plate 48 with a sealing 52 at the lower end of a piston shaft 54. The valve plate 48 forms the drain valve 32 together with an annular shoulder 50 at the drain socket 34.
Above the valve plate 48 and spaced apart therefrom a further plate 56 with an annular sealing 58 is provided at the piston shaft 54. The plate 56 cooperates with a projection 60, 62 of the housing projecting towards the inside. The projection 60,62 is positioned within the passage bore 42. The projection 60, 62 is annular and in alignment with the bore 44. If the drain valve 32 is open the plate 56 seahngly abuts the inside of the projection 60, 62.
In such a way the plate 56 and the projection 60, 62 together form the passage valve 30 which is adapted to close the bore 42. This is shown in Figure 4. As the plates 48 and 56 have the same diameter their effective area is identical so that the operation of the assembly is independent of the pressure.
The intermediate space 64 between the valve plate 48 and the plate 56 connects the outlet and the pressure sensor 40 independently of the position of the piston. Therefore, the pressure sensor 40 can measure the outlet pressure at all times and thereby the pressure in the boiler. From the pressure values the pressure difference is determined when the temperature increases.
Furthermore, a third plate 66 having the same diameter with a sealing 68 is provided at the piston shaft 46. The third plate 66 is guided at the upper end of the bore 44. The piston shaft 46 and the plates 48, 56 and 66 are integrally formed in one piece. A plate-shaped control member 70 is mounted at the end of the piston shaft 46 and fixed with a screw member 80. Scalings 72 and 74 are provided for sealing. With its upper side in the Figure the plate-shaped control member 70 serves as a spring abutment for a helical spnng 76.
The other end of the spnng 76 is supported by a cap 78 closing the housing.
The bore 44 has a larger inner diameter at its upper end. Thereby a shoulder 82 is formed on the inside of the housing. The shoulder 82 serves as a stop for the plate-shaped control member 70. The plate-shaped control member 70 is moveably guided in the area having the increased diameter of the bore 44 between the shoulder 82 and a shoulder 84 defined by the cap 78 and serving as the opposite stop. The movement occurs against the spnng power of the spnng 76.
The lower side of the plate-shaped control member 70 the inner wall of the bore 44 and the third plate 66 form a cylindrical control chamber 88. The control chamber 88 extends around the upper portion with increased diameter of the piston shaft 46. The forces acting in the control chamber 88 are determined by the effective area of the lower side of the plate-shaped control member 70 on one hand, and by the effective area on the upper side of the plate 66, on the other hand. As the effective area at the control member 70 is larger than at the plate 66 the control member is moved upwards together with the piston if the pressure is increased (see Fig.4). In the other way the control member is moved downwards together with the piston if the pressure drops until an equilibrium of the effective forces is reached (see Fig.3).
The bore 42 connected to the inlet 18 can be connected to the control chamber 88 through a passage 90, a valve chamber 94 and a passage 92. A valve plunger 96 is provided in the valve chamber 94. The valve plunger 96 is a portion of the magnetic valve controlling the connection between the passage 90 and the valve chamber 94. The opposite side of the valve plunger 96 shown upwards in the drawing controls a venting opening 98 opening to the atmosphere. If the magnetic valve closes the connection between the passage 90 and the bore 92 the valve chamber 94 and thereby the control chamber 88 are vented. The pressure is low and the piston is moved downwards into the position shown in Figure 3. If the magnetic valve opens the connection between the passage 90 and the valve chamber 94 the valve plunger closes the opening 98. Tn this position water can flow into the control chamber 88. Due to the increasing pressure the piston is moved upwards. Then the drain valve 32 is opened and the passage valve 30 is closed. This Situation is shown in Figure 4.
The diameters of the bore 44 and the projection 60, 62 is chosen such that the drain valve 32 opens only if the passage valve 30 is completely closed. This is shown in Figure 5.
In order to vent the boiler and to increase the air volume the magnetic valve with the plunger 96 is controlled in such a way that it releases the passage 90, 92, 94 so that the piston is moved upwards in a way descnbed above. Then water can be drained from the boiler through the drain. As the passage valve 30 is closed in this phase no water can flow back.
Preferably this venting procedure is initiated only if the boiler is not needed. This is particularly the case during the night. A suitable time frame is determined by the pressure sensor. If the pressure difference is becoming too large during the heating of the water the water is drained dunng this time frame.
Existing boilers can be upgraded with such an assembly without the need to replace them or to provide them with expensive, large expansion tanks.
Figure 6 shows how to connect the above described fitting 10 to a boiler 100. The air volume 102 above the water 104 is increased by venting with air through a venting valve 106 if water is drained through the fitting.

Claims (7)

1. Valve assembly (10) for water heaters having a boiler provided with an air cushion for compensating pressure variations, compnsing (a) a housing (12) with an inlet (18), an outlet (20) and a drain (36) arranged between the inlet and the outlet; (b) a spring-biased piston arranged between the inlet and the outlet, the piston having a piston shaft (46) provided with two spaced apart plates (66, 70) with a different effective area, the piston defining a control chamber (88) in a bore (44) of the house between these plates; (c) a valve plate (48) provided at the piston for a drain valve (32) at the drain; (d) a further valve plate (56) provided at the piston shaft, which forms a stop valve (30) with the housing (12) for blocking the passage (42) between the inlet and the outlet if the drain valve is open; and (e) an auxiliary valve (96) controlling the passage (90, 92, 94) between the control chamber and the inlet and which is adapted to be controlled by a pressure sensor (40) connected to the water reservoir such that (1) an inlet pressure is present in the control chamber if the auxiliary valve is opened and the piston is moved against the spring power in the opening direction of the drain valve and that the control chamber is vented if the auxiliary valve is closed so that the drain valve is closed.
2. Valve assembly according to claim 1, characterized in that the auxiliary valve is a magnetic valve.
3. Valve assembly according to claim 2, characterized in that the magnetic valve is arranged in a valve chamber (94) with a venting opening (98) and that the magnetic valve releases the venting opening to vent the control chamber if the passage between the control chamber and the inlet is blocked by the magnetic valve.
4. Valve assembly according to any of the preceding claims, characterized by a safety valve (24) positioned between the passage valve and the outlet.
5. Valve assembly according to any of the preceding claims, charactenzed by a backflow preventer (26) in the inlet.
6. Valve asscmbly according to any of the preceding claims, charactenzed in that the drain valve (32) is a valve with an inclined seat.
7. A valve assembly substantially as herein before descnbed with reference to andlor as shown in the accompanying drawings.
GB0817625A 2007-10-25 2008-09-25 Valve assembly for water heaters Withdrawn GB2454065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007051433A DE102007051433B3 (en) 2007-10-25 2007-10-25 Valve arrangement for water heater

Publications (2)

Publication Number Publication Date
GB0817625D0 GB0817625D0 (en) 2008-11-05
GB2454065A true GB2454065A (en) 2009-04-29

Family

ID=40019587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0817625A Withdrawn GB2454065A (en) 2007-10-25 2008-09-25 Valve assembly for water heaters

Country Status (2)

Country Link
DE (1) DE102007051433B3 (en)
GB (1) GB2454065A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2488395A (en) * 2011-02-22 2012-08-29 Sasserath & Co Kg H Assembly for controlling the temperature of a drinking water heater
CN103479228A (en) * 2013-09-18 2014-01-01 宁波全景电器技术有限公司 Anti-negative-pressure water nozzle
US8958321B2 (en) 2011-02-03 2015-02-17 Broadcom Corporation Power management of user equipment located on a femtocell base station
US9261293B2 (en) 2009-09-25 2016-02-16 Henri Peteri Beheer B.V. Apparatus for dispensing hot or boiling water
GB2572465A (en) * 2018-03-29 2019-10-02 Sasserath Hans Gmbh & Co Kg Drinking water heater with venting fitting
CN111829182A (en) * 2019-04-18 2020-10-27 宁波方太厨具有限公司 Water inlet connector and gas water heater with same
GB2586527A (en) * 2019-08-19 2021-02-24 Sasserath Hans Gmbh & Co Kg Pressure reducer assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI567271B (en) * 2010-09-27 2017-01-21 亨瑞彼德理伯希爾公司 Apparatus for dispensing hot or boiling water
IT201700108934A1 (en) * 2017-09-28 2019-03-28 Rubinetterie Ritmonio S R L SAFETY VALVE FOR WATER HEATERS, IN PARTICULAR VALVE AGAINST OVER-PRESSURES FOR WATER HEATERS
CN114484280B (en) * 2022-04-15 2022-06-10 中国石油化工股份有限公司胜利油田分公司 Flow regulating device for liquid carbon dioxide distribution

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960818A (en) * 1998-09-08 1999-10-05 Hans Sasserath & Co. Kg Filling fitting for filling a closed hot-water heating system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19847870C1 (en) * 1998-10-16 2000-03-02 Bsh Bosch Siemens Hausgeraete Electric through flow water heater has pressure limiter formed by reduced section connector pipe between water chamber and hydraulic system of heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960818A (en) * 1998-09-08 1999-10-05 Hans Sasserath & Co. Kg Filling fitting for filling a closed hot-water heating system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9261293B2 (en) 2009-09-25 2016-02-16 Henri Peteri Beheer B.V. Apparatus for dispensing hot or boiling water
US8958321B2 (en) 2011-02-03 2015-02-17 Broadcom Corporation Power management of user equipment located on a femtocell base station
GB2488395A (en) * 2011-02-22 2012-08-29 Sasserath & Co Kg H Assembly for controlling the temperature of a drinking water heater
GB2488395B (en) * 2011-02-22 2015-11-11 Sasserath & Co Kg H Assembly for controlling the temperature of a drinking water heater
CN103479228A (en) * 2013-09-18 2014-01-01 宁波全景电器技术有限公司 Anti-negative-pressure water nozzle
CN103479228B (en) * 2013-09-18 2015-10-28 宁波全景电器技术有限公司 Anti-negative pressure faucet
GB2572465A (en) * 2018-03-29 2019-10-02 Sasserath Hans Gmbh & Co Kg Drinking water heater with venting fitting
GB2572465B (en) * 2018-03-29 2021-11-17 Sasserath Hans Gmbh & Co Kg Drinking water heater with venting fitting
CN111829182A (en) * 2019-04-18 2020-10-27 宁波方太厨具有限公司 Water inlet connector and gas water heater with same
CN111829182B (en) * 2019-04-18 2021-05-18 宁波方太厨具有限公司 Water inlet connector and gas water heater with same
GB2586527A (en) * 2019-08-19 2021-02-24 Sasserath Hans Gmbh & Co Kg Pressure reducer assembly

Also Published As

Publication number Publication date
DE102007051433B3 (en) 2009-04-02
GB0817625D0 (en) 2008-11-05

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