WO2011089482A1 - Valve holder for expansion tanks - Google Patents

Valve holder for expansion tanks Download PDF

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Publication number
WO2011089482A1
WO2011089482A1 PCT/IB2010/053527 IB2010053527W WO2011089482A1 WO 2011089482 A1 WO2011089482 A1 WO 2011089482A1 IB 2010053527 W IB2010053527 W IB 2010053527W WO 2011089482 A1 WO2011089482 A1 WO 2011089482A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve holder
expansion tank
wall
hole
area
Prior art date
Application number
PCT/IB2010/053527
Other languages
French (fr)
Inventor
Ugo Benettolo
Original Assignee
Zilmet Spa
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 Zilmet Spa filed Critical Zilmet Spa
Publication of WO2011089482A1 publication Critical patent/WO2011089482A1/en

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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/10—Welded housings
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/07—Construction of housing; Use of materials therefor of cutting-off parts of tanks, e.g. tank-cars
    • 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
    • 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

Definitions

  • the present patent relates to expansion tanks and in particular concerns valves and valve holders for preloading and regulating the preloading pressure of expansion tanks.
  • An expansion tank is a hydraulic component, commonly used in boilers for domestic heating and in heating systems, which performs the function of compensating for the pressure variations produced by variations in temperature of the fluid in the circuit, avoiding dangerous increases in the circuit pressure, which would otherwise have to be absorbed by the pipes and the rest of the system.
  • Expansion tanks are hydraulic components commonly used also in pumping systems and lifting systems, which perform the function of accumulating the circuit fluid and then allowing it to return to the circuit.
  • expansion tanks There are two types of expansion tanks, open and closed.
  • Closed expansion tanks consist of a rigid container divided into two chambers with variable volume, one containing the circuit fluid, which is virtually uncompressible, and the other containing air or other gas, compressible, preloaded to a set pressure by means of a valve, similar to a tyre valve.
  • the two chambers can be divided by a cushion or an elastic membrane. Any variation in pressure will cause the cushion to vary in volume or will determine shifting of the membrane, thus compensating the pressure variation or permitting accumulation of the circuit fluid.
  • the current expansion tanks comprise two dome-shaped or cylindrical half- shells closed on one side, made of rigid metal, opposite and joined to constitute a generically toroidal form or a closed cylindrical form.
  • the membrane divides the internal space into two chambers, generically corresponding to the two dome-shaped or cylindrical half-shells.
  • One of the two half-shells has a coupling, communicating with the adjacent internal volume, for connection of the expansion tank to the hydraulic circuit.
  • the other half-shell has a valve holder with valve for preloading and regulating the gas or air under pressure.
  • valve holders of the known expansion tanks generically consist of an externally threaded cylindrical part containing the valve and suitable for connection with a pressure generator/regulator, an internally grooved cylindrical element containing a gasket, and a substantially cylindrical terminal part.
  • the pressure generator/regulator is connected to the expansion tank for initial preloading and for regulation of the expansion tank internal pressure.
  • the current valve holders are applied to the wall of the expansion tanks by deformation of the lower edge of the terminal part.
  • the wall of the half-shell designed to receive said valve holder is perforated and rendered substantially flat in the area of application of said valve holder.
  • the surface on which the valve holder is applied must be perfectly flat to couple with the internally grooved cylindrical element containing the gasket. If not, the valve holder does not close correctly and fully throughout the coupling surface or circumference of the valve holder and half-shell with the result that the gas taken into the expansion tank is not sealed.
  • the imperfect closure between the expansion tank wall and the valve holder can lead, in the long term, to outflow or leakage of gas under pressure and, once the expansion tank has been put on the market, this can result in discarding of said expansion tank by the end customer, frequent interventions by the maintenance personnel in order to restore the internal pressure of the expansion tank and incorrect operation of said expansion tank.
  • the need to guarantee perfect closure between the expansion tank wall and the valve holder entails, during production of the expansion tank, frequent adjustments to the machines and meticulous checks by the operators, resulting in a considerable wastage of time without any absolute certainty as to the long-term effectiveness of the seal.
  • One object of the new valve holder is to obtain a valve holder that requires one or very few operations for adjustment of the machines and control during its connection to the expansion tank wall.
  • a further object of the new valve holder is to ensure perfect coupling and welding with the expansion tank wall even when the surface of the expansion tank for application of the valve holder is not perfectly flat.
  • a further object of the new valve holder is to allow application and welding thereof on the curved non-flattened wall of the expansion tank.
  • a further object of the new valve holder is to ensure perfect and long-lasting connection and welding with the expansion tank wall.
  • valve holder for expansion tanks comprising a generically cylindrical body, suitable for containing the valve; having a projection or terminal part for connection to the wall of the expansion tank with double taper.
  • Substantially said projection or terminal part for connection comprises a first tapered area, sealing the edge of the hole of the expansion tank wall, a cylindrical area for insertion and coupling with the edge of the hole of the expansion tank wall, suitable for preventing entry of the melted metal inside the valve holder, and a second tapered area suitable for facilitating insertion and centring of the valve holder in the hole of the expansion tank wall.
  • Both the tapered areas of said projection or terminal part for connection of the new valve holder taper towards the direction of insertion of the new valve holder in the hole of the expansion tank wall.
  • the first tapered area has its smaller diameter substantially equal to the larger diameter of the second tapered area.
  • the smaller diameter of the first tapered area and the larger diameter of the second tapered area are substantially equal to the diameter of the intermediate cylindrical area.
  • Said first tapered area has, on its side opposite the second tapered area, an annular plane portion orthogonal to the axis of the cylindrical body of the new valve holder.
  • the hole to be made on the expansion tank wall, for insertion of the new valve holder has a diameter at least equal to the smaller diameter of the first tapered area and less than the larger diameter of said first tapered area.
  • the rim of the edge of said hole adheres to the surface of the first tapered area.
  • Small differences between the nominal diameter and the actual diameter of the hole in the expansion tank wall result in the rim of the edge of said hole of the expansion tank wall resting on a circumference of greater or lesser diameter along the first tapered area, or a greater or lesser penetration of the new valve holder into the expansion tank wall.
  • the new valve holder is joined to the expansion tank wall by resistance welding through melting: an electrode is applied to the expansion tank wall and a second electrode to the annular portion adjacent to the first tapered area of the new valve holder, and simultaneously an adequate pressure is applied between the new valve holder and the expansion tank wall. In this way the edge of the hole of the expansion tank wall is securely welded to the surface of the first tapered area of the new valve holder.
  • any irregularities of said hole of the expansion tank wall are remedied during the connection by welding.
  • the rim of the edge of the hole of the expansion tank wall and part of the first tapered area are melted and, due to the simultaneous welding pressure, the surface of the first tapered area adapts perfectly to the rim of the edge of the expansion tank wall.
  • Figures 1 and 3 illustrate a section of the new valve holder (A), while figure 2 shows an axonometric view of the new valve holder (A).
  • the new valve holder (A) comprises a generically cylindrical body (1), suitable for containing the valve (not illustrated in the figure), having a projection or terminal part for connection (2, 3, 4, 5) to the wall (P) of the expansion tank with double taper.
  • Substantially said projection or terminal part for connection (2, 3, 4, 5) comprises a first tapered sealing area (2) on the edge of the hole of the wall (P) of the expansion tank, a cylindrical area (3) for insertion and coupling with the edge of the hole of the wall (P) of the expansion tank, suitable for preventing melted metal entering the inside of the new valve holder (A), and a second tapered area (4) suitable for facilitating insertion and centring of the valve holder (A) in the hole of the wall (P) of the expansion tank.
  • the first tapered area (2) has its smaller diameter substantially equal to the larger diameter of the second tapered area (4).
  • the smaller diameter of the first tapered area (2) and the larger diameter of the second tapered area (4) are substantially equal to the diameter of the intermediate cylindrical area
  • Said first tapered area (2) has, on its side opposite the second tapered area
  • Figure 3 illustrates application of the new valve holder (A) in the hole of the wall (P) of an expansion tank.
  • the new valve holder (A) is inserted in the hole previously made on the wall (P) so that the second tapered area (4) permits centring, both manual and automated, of the new valve holder (A), and so that the surface of the first tapered area (2) rests on the edge of the hole of the wall (P) of the expansion tank.
  • the new valve holder (A) is connected to the wall (P) by means of resistance welding through melting: an electrode (El) is applied and pressed on the inner surface of the wall (P) of the expansion tank and a second electrode (E2) is applied and pressed on the annular plane surface (5) of the new valve holder (A).

Abstract

The invention is a new valve holder (A) for expansion tanks, comprising a generically cylindrical body (1) suited to contain the valve and having a projection or terminal part (2, 3, 4, 5) with double taper for connection to the wall (P) of the expansion tank by means of resistance welding with melting. Said joining projection or terminal part (2, 3, 4, 5) comprises a first conical area (2) suited to ensure the tightness of the edge of the hole in the wall (P) of the expansion tank, a cylindrical area (3) for insertion in and coupling with the edge of the hole, a second conical area (4) suited to facilitate insertion and centering of the valve holder (A) in the hole in the wall (P) of the expansion tank.

Description

VALVE HOLDER FOR EXPANSION TANKS
DESCRIPTION
The present patent relates to expansion tanks and in particular concerns valves and valve holders for preloading and regulating the preloading pressure of expansion tanks.
An expansion tank is a hydraulic component, commonly used in boilers for domestic heating and in heating systems, which performs the function of compensating for the pressure variations produced by variations in temperature of the fluid in the circuit, avoiding dangerous increases in the circuit pressure, which would otherwise have to be absorbed by the pipes and the rest of the system. Expansion tanks are hydraulic components commonly used also in pumping systems and lifting systems, which perform the function of accumulating the circuit fluid and then allowing it to return to the circuit.
There are two types of expansion tanks, open and closed.
Closed expansion tanks consist of a rigid container divided into two chambers with variable volume, one containing the circuit fluid, which is virtually uncompressible, and the other containing air or other gas, compressible, preloaded to a set pressure by means of a valve, similar to a tyre valve. The two chambers can be divided by a cushion or an elastic membrane. Any variation in pressure will cause the cushion to vary in volume or will determine shifting of the membrane, thus compensating the pressure variation or permitting accumulation of the circuit fluid.
The current expansion tanks comprise two dome-shaped or cylindrical half- shells closed on one side, made of rigid metal, opposite and joined to constitute a generically toroidal form or a closed cylindrical form. Inside, the membrane divides the internal space into two chambers, generically corresponding to the two dome-shaped or cylindrical half-shells. One of the two half-shells has a coupling, communicating with the adjacent internal volume, for connection of the expansion tank to the hydraulic circuit.
The other half-shell has a valve holder with valve for preloading and regulating the gas or air under pressure.
The valve holders of the known expansion tanks generically consist of an externally threaded cylindrical part containing the valve and suitable for connection with a pressure generator/regulator, an internally grooved cylindrical element containing a gasket, and a substantially cylindrical terminal part.
The pressure generator/regulator is connected to the expansion tank for initial preloading and for regulation of the expansion tank internal pressure. The current valve holders are applied to the wall of the expansion tanks by deformation of the lower edge of the terminal part.
For said purpose the wall of the half-shell designed to receive said valve holder is perforated and rendered substantially flat in the area of application of said valve holder.
The known valve holders, constructed as described above, have various drawbacks.
The surface on which the valve holder is applied must be perfectly flat to couple with the internally grooved cylindrical element containing the gasket. If not, the valve holder does not close correctly and fully throughout the coupling surface or circumference of the valve holder and half-shell with the result that the gas taken into the expansion tank is not sealed.
The imperfect closure between the expansion tank wall and the valve holder can lead, in the long term, to outflow or leakage of gas under pressure and, once the expansion tank has been put on the market, this can result in discarding of said expansion tank by the end customer, frequent interventions by the maintenance personnel in order to restore the internal pressure of the expansion tank and incorrect operation of said expansion tank. The need to guarantee perfect closure between the expansion tank wall and the valve holder entails, during production of the expansion tank, frequent adjustments to the machines and meticulous checks by the operators, resulting in a considerable wastage of time without any absolute certainty as to the long-term effectiveness of the seal.
To remedy all the above-mentioned drawbacks, a new valve holder for expansion tanks has been studied and produced.
One object of the new valve holder is to obtain a valve holder that requires one or very few operations for adjustment of the machines and control during its connection to the expansion tank wall.
A further object of the new valve holder is to ensure perfect coupling and welding with the expansion tank wall even when the surface of the expansion tank for application of the valve holder is not perfectly flat.
A further object of the new valve holder is to allow application and welding thereof on the curved non-flattened wall of the expansion tank.
A further object of the new valve holder is to ensure perfect and long-lasting connection and welding with the expansion tank wall.
These and further objects, direct and complementary, are achieved by the new valve holder for expansion tanks comprising a generically cylindrical body, suitable for containing the valve; having a projection or terminal part for connection to the wall of the expansion tank with double taper.
Substantially said projection or terminal part for connection comprises a first tapered area, sealing the edge of the hole of the expansion tank wall, a cylindrical area for insertion and coupling with the edge of the hole of the expansion tank wall, suitable for preventing entry of the melted metal inside the valve holder, and a second tapered area suitable for facilitating insertion and centring of the valve holder in the hole of the expansion tank wall. Both the tapered areas of said projection or terminal part for connection of the new valve holder taper towards the direction of insertion of the new valve holder in the hole of the expansion tank wall.
The first tapered area has its smaller diameter substantially equal to the larger diameter of the second tapered area. The smaller diameter of the first tapered area and the larger diameter of the second tapered area are substantially equal to the diameter of the intermediate cylindrical area.
Said first tapered area has, on its side opposite the second tapered area, an annular plane portion orthogonal to the axis of the cylindrical body of the new valve holder.
The hole to be made on the expansion tank wall, for insertion of the new valve holder, has a diameter at least equal to the smaller diameter of the first tapered area and less than the larger diameter of said first tapered area.
When the new valve holder is inserted in the hole of the expansion tank wall, the rim of the edge of said hole adheres to the surface of the first tapered area. Small differences between the nominal diameter and the actual diameter of the hole in the expansion tank wall result in the rim of the edge of said hole of the expansion tank wall resting on a circumference of greater or lesser diameter along the first tapered area, or a greater or lesser penetration of the new valve holder into the expansion tank wall.
The new valve holder is joined to the expansion tank wall by resistance welding through melting: an electrode is applied to the expansion tank wall and a second electrode to the annular portion adjacent to the first tapered area of the new valve holder, and simultaneously an adequate pressure is applied between the new valve holder and the expansion tank wall. In this way the edge of the hole of the expansion tank wall is securely welded to the surface of the first tapered area of the new valve holder.
In particular since only the edge of the hole of the wall is in contact with the surface of the tapered area, there is significant resistance to passage of the current and therefore a considerable amount of heat is generated due to the Joule effect.
Any differences between the nominal diameter and the actual diameter of the hole of the expansion tank wall are compensated for by the greater or lesser penetration of the new valve holder into the hole of the expansion tank wall.
Any irregularities of said hole of the expansion tank wall are remedied during the connection by welding. During welding, in fact, the rim of the edge of the hole of the expansion tank wall and part of the first tapered area are melted and, due to the simultaneous welding pressure, the surface of the first tapered area adapts perfectly to the rim of the edge of the expansion tank wall.
The characteristics of the new valve holder will be better clarified by the following description with reference to the drawings attached by way of non-limiting example.
Figures 1 and 3 illustrate a section of the new valve holder (A), while figure 2 shows an axonometric view of the new valve holder (A).
The new valve holder (A) comprises a generically cylindrical body (1), suitable for containing the valve (not illustrated in the figure), having a projection or terminal part for connection (2, 3, 4, 5) to the wall (P) of the expansion tank with double taper.
Substantially said projection or terminal part for connection (2, 3, 4, 5) comprises a first tapered sealing area (2) on the edge of the hole of the wall (P) of the expansion tank, a cylindrical area (3) for insertion and coupling with the edge of the hole of the wall (P) of the expansion tank, suitable for preventing melted metal entering the inside of the new valve holder (A), and a second tapered area (4) suitable for facilitating insertion and centring of the valve holder (A) in the hole of the wall (P) of the expansion tank.
Both the tapered areas (2, 4) of said projection or terminal part (2, 3, 4, 5) for connection of the new valve holder (A) taper towards the direction of insertion of the new valve holder (A) in the hole of the wall (P) of the expansion tank.
The first tapered area (2) has its smaller diameter substantially equal to the larger diameter of the second tapered area (4). The smaller diameter of the first tapered area (2) and the larger diameter of the second tapered area (4) are substantially equal to the diameter of the intermediate cylindrical area
(3) .
Said first tapered area (2) has, on its side opposite the second tapered area
(4) , an annular plane portion (5) orthogonal to the axis of the cylindrical body ( 1 ) of the new valve holder (A).
Figure 3 illustrates application of the new valve holder (A) in the hole of the wall (P) of an expansion tank.
The new valve holder (A) is inserted in the hole previously made on the wall (P) so that the second tapered area (4) permits centring, both manual and automated, of the new valve holder (A), and so that the surface of the first tapered area (2) rests on the edge of the hole of the wall (P) of the expansion tank. The new valve holder (A) is connected to the wall (P) by means of resistance welding through melting: an electrode (El) is applied and pressed on the inner surface of the wall (P) of the expansion tank and a second electrode (E2) is applied and pressed on the annular plane surface (5) of the new valve holder (A). The subsequent application of electric current between said two electrodes (El, E2) and the simultaneous pressure between said two electrodes (El, E2) result in partial melting of the edge of the hole of the wall (P) of the expansion tank and the first tapered area (2) of the new valve holder (A) which are thus securely welded together.
Therefore with reference to the preceding description and the enclosed drawings, the following claims are made.

Claims

1. Valve holder (A) in metal for expansion tanks, characterized in that it comprises a generically cylindrical body (1) suited to contain the valve and provided with a projection or terminal part (2, 3, 4, 5) for connection to the wall (P) of the expansion tank, comprising a first conical area (2) tapering towards the direction of insertion of the new valve holder (A) in the hole in the wall (P) of the expansion tank, and wherein said valve holder (A) is joined to the wall (P) of the expansion tank by means of resistance welding through melting along the contact circumference between the edge of the hole in the wall (P) and the surface of the conical area (2) suited to join the edge of said hole in said wall (P) to the surface of said conical area (2) of the valve holder (A).
2. Valve holder (A) according to claim 1, characterized in that said projection or terminal part (2, 3, 4, 5) suited to be joined to the wall (P) of the expansion tank comprises a cylindrical area (3) and a further conical area (4), and wherein both said conical areas (2, 4) taper towards the direction of insertion of the new valve holder (A) in the hole in the wall (P) of the expansion tank, and wherein said first conical area (2) has its short diameter substantially equal to the long diameter of the second conical area (4).
3. Valve holder (A) according to claims 1, 2, characterized in that the short diameter of said first conical area (2) and the long diameter of said second conical area (4) are substantially equal to the diameter of the intermediate cylindrical area (3).
4. Valve holder (A) according to the preceding claims, characterized in that said first conical area (2) has, on its side opposite the second conical area (4), an annular plane portion (5) orthogonal to the axis of the cylindrical body (1) of the new valve holder (A) that is suitable for temporarily supporting the welding electrode (E2).
PCT/IB2010/053527 2010-01-22 2010-08-04 Valve holder for expansion tanks WO2011089482A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000007A ITPD20100007A1 (en) 2010-01-22 2010-01-22 VALVE HOLDER FOR EXPANSION VESSELS
ITPD2010A000007 2010-01-22

Publications (1)

Publication Number Publication Date
WO2011089482A1 true WO2011089482A1 (en) 2011-07-28

Family

ID=42969670

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/053527 WO2011089482A1 (en) 2010-01-22 2010-08-04 Valve holder for expansion tanks

Country Status (2)

Country Link
IT (1) ITPD20100007A1 (en)
WO (1) WO2011089482A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCR20120017A1 (en) * 2012-08-10 2014-02-11 Wonder Spa WELDING VALVE FOR EXPANSION VESSELS

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB226464A (en) * 1924-09-19 1924-12-24 Samuel Hunter Gordon Improvements in or relating to metal drums and like containers
GB778845A (en) * 1953-04-15 1957-07-10 Exactor Ltd Improvements in fluid containers
GB1107100A (en) * 1965-09-27 1968-03-20 Gaskell & Chambers Ltd Valve means for use with a liquid container
GB1282021A (en) * 1968-11-29 1972-07-19 Danfoss As A fluid-flow connection between a casing for a refrigerator motor compressor and a pipe
US3776260A (en) * 1971-04-13 1973-12-04 Burnett & Rolfe Ltd Beer kegs and like containers
EP0025682A2 (en) * 1979-09-12 1981-03-25 Alumasc-Grundy Limited Improvements in casks and like containers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB226464A (en) * 1924-09-19 1924-12-24 Samuel Hunter Gordon Improvements in or relating to metal drums and like containers
GB778845A (en) * 1953-04-15 1957-07-10 Exactor Ltd Improvements in fluid containers
GB1107100A (en) * 1965-09-27 1968-03-20 Gaskell & Chambers Ltd Valve means for use with a liquid container
GB1282021A (en) * 1968-11-29 1972-07-19 Danfoss As A fluid-flow connection between a casing for a refrigerator motor compressor and a pipe
US3776260A (en) * 1971-04-13 1973-12-04 Burnett & Rolfe Ltd Beer kegs and like containers
EP0025682A2 (en) * 1979-09-12 1981-03-25 Alumasc-Grundy Limited Improvements in casks and like containers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCR20120017A1 (en) * 2012-08-10 2014-02-11 Wonder Spa WELDING VALVE FOR EXPANSION VESSELS

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Publication number Publication date
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