SI9300060A - Safety arrangement for water heaters - Google Patents

Abstract

The invention relates to a safety assembly for a heater of water made so as to have a length of 153 in the housing (1) mm three basic functional elements installed: ball valve (2), non-return valve (3) and diaphragm valve safety valve (4) on one axis and therefore enables easy and quick installation in the water supply network, and as a whole reliably performs its security function water heaters, capacity up to 200 i. with melting point load up to 75 KW before tiak rising above while preventing the heater from draining, v in case of interruption of water supply from water supply network. Depending on the temperature of the medium, however, it is an area applications up to 120 degrees Celsius.

Description

WATER HEATER ASSEMBLY

The present invention falls within the field of fittings used as part of equipment in plumbing.

The present invention is primarily intended to protect water heaters from rising pressure above working pressure, and at the same time to prevent emptying of the heater in the event of interruption of water supply from the network.

The fittings of the types mentioned above are commonly known and are commonly referred to as the WATER HEATER ASSEMBLY (Schematic diagram in Fig. 1) and combine three basic functional elements: a stop valve (2), a non-return valve (3) and a diaphragm safety valve. (4).

Depending on the technical solutions and available data from some well-known manufacturers, such as:

-GUSTAV SCHMIEDL, ARMATURENFABRIK GMBH. & Co. KG., A-6060 Hall in Tirol, Austria

-HANS SASSERATH & CO. KG. Muehlenstrasse 62 D-4052 Korschenbroick 1

It is impossible to compare similar assemblies with their intended purpose because they are inferior in design, which means:

- that they are relatively cumbersome in relation to the space available during installation, and it takes a great deal of effort and time for the valve to be installed on an existing plumbing installation. Bulk reinforcement also causes more material consumption.

- that they are relatively complicated, since the main functional elements (shut-off, non-return and diaphragm valves) are positioned in several axes, which causes unfavorable current conditions within the armature because the number and mode of change of the direction of the medium is significant. The complicated design of the known safety assemblies so far makes it impossible to complete the structure (if necessary).

- a classic threaded valve is used to regulate the flow of cold water, which requires more time to activate (closing-opening).

- the housing is made by a casting process (casting is more likely to have a defect in the structure of the material),

The invention is based on the problem of how to place the three basic Functional elements (shut-off, non-return and diaphragm safety valves) on one axis in the smallest possible space, which would allow, while maintaining the required functionality and utility:

- pain j favorable current conditions within the armature

- Easy manipulation and quick assembly

- reduced material consumption

- increased safety at work

The invention is further concretized on the basis of two embodiments (according to a combination of different structural elements) shown in the accompanying drawings showing:

FIG. 2 Design I of the safety assembly for the water heater in three-dimensional projection i.

FIG. 2a is an embodiment I of a longitudinal cross section of a water heater of a water heater.

FIG. 3 Version II of the safety assembly for the water heater in three-dimensional projection i.

FIG. 3a Version II of the water heater safety assembly? in longitudinal section II-II.

EXECUTION I (Figures 2 and 2a)

Housing (1) of the safety assembly is hollow forged in hot MsbB brass, which ensures high homogeneity of the material structure and good strength properties, without any effect of porosity in the material structure, and consists of a body (JA) and an attachment (IB). are threaded and glued together. The housing (s) is two-piece to allow the ball valve to be inserted.

The body of the housing (IA) is provided with the necessary threaded outlets as follows:

- female thread Mr 1/2 on stab, for mounting the attachment (IB) - female thread Mr 1/2 on perimeter, (top) for mo! 11 a ž o 11 a g r e 1 n i k water - female thread Mr 1/2 on perimeter, (bottom) for mon ta z o of exact c: ev i - notr a n j i m n a v o j em Mr 1/4 (at to the left boku) for insertion safety plug i n from BC • Tino for mounting the ball axis

out t.i, 1 a.

The back of the body (IA) body is extended to accommodate the diaphragm safety valve and is closed with a plastic plug "

Inside the body (center), there is a suitable space for inserting a non-return valve.

The nozzle (IB) is screwed onto the housing body (IA) by means of an external thread G 1/2 after mounting the ball valve.

The threaded joint is inextricably stuck. On the other side of the fitting (IB) there is also an external thread G .1 / 2 for mounting on an existing plumbing installation.

The housing, with its construction, allows for the smooth adjustment of all major functional elements in a relatively small space.

The BALL VALVE (2) was first used as an integral part of the safety assembly for regulating the flow of water. It is used to close the water supply in case of intervention on the heater, so it is not necessary to close the main cold water valve. Water flow is controlled by rotating the ball valve arm 90 °. The self snail j of this lever simultaneously shows the direction and size of the flow (lever parallel to the axis-valve open, lever perpendicular to the axis-valve closed. Sealing on the ball valve axis is made with two O-rings (same as for gas ball valves) by standards DIN-DVGW, which provides the most reliable seal.

A NON-RETURN VALVE (3) allows the flow of the medium in one direction only (in the direction of the water heater), thus preventing the water heater from emptying in case of interruption of the water supply from the mains and thereby returning the heat? water from the heater to the water supply network.

MEMBRANE SAFETY VALVE (4) provides reliable mechanical protection of the water heater, because when the water in the heater is heated above the critical temperature, the water pressure in the heater simultaneously increases. At the moment when the pressure exceeds 6 bz (600 kPa), the safety valve opens. and hot water flows into falls under the operating pressure (6 bar) to which the safety valve is set, the safety valve closes. A SAFETY CEP (tl) mounted in the control opening makes it easy to check the function of the check valve.

The drain hose (6) directs the outflow of water from the safety valve in direction b 'to the sewer drain.

The PLASTIC CAP (7) has, in particular, the aesthetic function of closing the safety assembly at the rear or closing the safety valve. It is designed ergonomically to allow adequate grip when manually opening the safety valve (manually emptying the water heater).

The rosette (8) has an aesthetic function when installing the safety assembly.

Entry side (a) - Connection to an existing network with external thread G 1/2

Exit side (b) - G 1/2 branch with mounted drainage pipe (6) for drainage of water from the safety valve into the sewer drain, without a serially fitted siphon.

Water heater connection (c) - branch on housing (i) of safety assembly with female thread G 1/2

The letters a, b and c indicate the direction of the medium inside the armature, or within the system.

The safety assembly of version I mounted in the system occupies 152 mm of pipeline length.

EXECUTION II (Figs. 5 and 3a)

The housing (1) of the safety assembly in version II is a three-piece housing consisting of a housing body (IA), an attachment (IB) and a Dutch (IC) connection, which facilitates installation manipulation in the existing water supply system.

The body of the housing (IA) of the safety assembly differs slightly, because the left and right branches with G 1/4 thread are fitted, for connection of the water pressure gauge - manometer (left or right version, the second branch is closed with a plug). safety plug 90 ° offset by circumference.

THE BALL VALVE (2) is the same as for version I.

SHAFT VALVE (3) is the same as for version I.

MEMBRANE SAFETY VALVE (4) is the same as for version I. SAFETY CEP (5) is the same as for version I.

The drain hose (6) is of elbow design so that it can be adjusted depending on the installation conditions.

The PLASTIC CAP (7) is the same as that of Version I.

The rosette (8) is the same as that of version I.

The MANOMETER (7) allows system pressure control and can be mounted to the left or right side of the housing if necessary.

CEP (10) for closing unused branch

The siphon (11) directs the drainage of water from the safety valve (4) through the crankcase drainage pipe (6).

Entry side (a) - Connection to an existing network by means of a connector with Dutch G 1/2

Outlet side (b) - for the drainage of water from the safety valve (4) through the elbow drain pipe (ό) into the siphon (11) and further into the sewer drain.

Connector for water heater (c) - branch on housing (1) of safety assembly with male thread 6 1/2

The letters a, “b and c indicate the direction of the medium inside the armature, or within the system.

The safety net of version II mounted on the grid occupies 159 mm of pipeline length.

Designs I and II are functionally identical, and version II is better equipped, allowing for lower costs and easier maneuvering of assembly.

Both versions are used as part of the equipment in plumbing installations, and with connection dimension DN 15 (1/2) are intended primarily for the protection of water heaters, capacity up to 200 1, with a thermal load up to 75 KW and medium temperature up to 120 ° C, which perfectly meets the requirements of the intended use.

Modus operandi

Cold water from the mains enters the safety assembly from direction a.If the ball valve (2) is open (valve lever parallel to the armature axis), cold water in the c direction or in the water heater (water heater) flows. If the water, when heated in the boiler, reaches a critical temperature, or if it is exceeded, then the water pressure in the boiler starts to increase. As soon as the pressure in the boiler exceeds 6 bar (600 kPa), the diaphragm safety valve (4) opens and hot water flows in direction b through the drain pipe (6) into the free sewer drain, thus preventing damage to the system. The non-return valve (3) prevents water from flowing back into the water supply network. When the water pressure in the boiler drops below the maximum pressure of 6 bar to which the safety valve is set, the safety valve closes and returns to normal water flow from direction 'a' in direction c , or from the network via a non-return valve (3) that allows water to flow in this direction only to the boiler.

The ball valve (2) is in the open position all the time, it is closed only in case of intervention in the system, in which case it is not necessary to close the main shut-off valve for cold water.

Taking into account that domestic and even foreign standards for testing such fittings (as a whole) are not available, the tests were based on the relevant provisions of those applicable DIN and ISO standards, which define the individual characteristics and requirements of the component components of the assembly.In the test program, which have been carried out in order to provide a professionally substantiated opinion on the suitability of use and functionality of the newly innovated technical solutions of the reinforcement include:

- determination of hydraulic flow characteristics of the entire safety assembly - definition of flow Kv - value

- pressure test of the assembly

- test the functionality of the assembly and the individual subassemblies

- assessment of the sound emission of the assembly

This is shown in the attached sketches as follows:

- Fig. 4 and Fig. 5 diagram of pressure drop in the safety assembly with respect to the volume flow of water

- Figs. 7 and 7 are diagrams of the values of local pressure loss coefficients with respect to Re-number

All hydraulic tests were performed with cold water 14 ° + 2 ° C, at steady flow conditions.

Some tests of the functionality of the assembly are also performed with compressed air.

The baseline standards for conducting the tests and forming the peer review were:

- DIN 1988, Teil 1, Teil 2 (1988), Tecnische Regeln fuer T rinkwasser - Installationen (TRWI),

- DIN 4753, Teil 1 (1988) Trink und Betriebswasser, Wassererwaerner und Wassererwaermungs anlagen fuer

- TRD 721 (TUVIS 1982) Sicherheitseinrichtungen gegen Druckueberschreitung - Sicherheits Ventile - fuer Dampfkesell der Gruppe II,

- ISO 4126 (1981), ISO 5208 (1982), ISO 3822-2 (1984) and ISO 3822-3 (1984).

Measurements

1. Hydraulic characteristics of the safety assembly

The hydraulic flow characteristic of the valve is determined on the basis of repeated measurements under identical installation conditions and for the fully open position of the shut-off ball valve. Fig.5) in logarithmic coordinates. The course of the values of the local pressure loss coefficient with respect to Re number can be seen in diagrams D-2 and D-2A (Fig. 6 and Fig. 7). The correlation for describing a flow characteristic is in the form:

ap = a.vb is:

-Ap (kPa) ... pressure drop

-V (m ³ / h) .. volume flow of water

- a, b ..... an approximation coefficient with the following values: a = 14360; b = 1, 54302

The obtained correlation, or approximation coefficient, are obtained at the value of the correlation coefficient of fit: r - 0,9998.

The nominal (nominal) outlet value of cold water flow at a temperature of 15 ° C after a nominal pressure on the safety assembly of p = l bar is:

k _v = V = 3.52 m ³ / h

2. Testing the functionality of the assembly

When testing the function of the safety assembly, the operation of the safety valve assembly or the setting of the opening pressure and the correct operation of the non-return valve are checked.

The simulation of the pressure rise in the system is done with water and air and repeated several times.

An accuracy pressure gauge r = 67 is used to track the pressure change.

The opening pressure of the diaphragm safety valve during the water test was 6 bar ± 0.25 bar and for the air test 6 bar ± 0.4 bar.

The operation of the non-return valve was impeccable in all simulations, so as the pressure on the drain side (in the water heater) rises, the non-return valve completely prevents (closes) the flow of hot water into the network.

3.Evaluation and test of sound emission of reinforcement

The sound emission test for the flow of water through the valve is determined at a water outlet pressure of p = 3 bar and a fully open flow. This test is for informative purposes only because it has not been fully carried out in accordance with the requirements of the applicable standards relating to outlet sanitary fittings.

The increment of sound emission from water flow relative to ambient sound emission (provided that water does not flow through the valve) is a maximum of ± 3 dB (A) measured at frequency:

f = 1000 Hz.

4.Other tests

In addition to the tests mentioned above, the functionality of the safety assembly after heating the armature to 120 ° C (15 min) in thermal oil has also been tested.

Measurements obtained from repeated functional tests showed that the utility and functionality of the reinforcement remained intact.

Considering the obtained measurements of the tests performed, the examination of the reinforcement samples, the accompanying technical documentation and the requirements of the applicable foreign standards, the assessment is as follows:

a) The water heater safety assembly under consideration is fully fit for purpose in terms of functionality and suitability for use.

b) Depending on the connection dimensions, technical design and construction solution, the valve is designed to protect closed systems for the preparation of sanitary water with a thermal load of up to 75 KW.

c) The typical flow value of the armature at a nominal pressure drop of 1 bar is 3.52 m ^{3 /} h. This value applies to the fully open position of the armature (Fig. 4 and Fig. 5).

d) The value of the local pressure loss coefficient of the reinforcement relating to the nominal connection DN 15 (d = 16 mm) is 17-Ξ-12 (Fig-6 and Fig.7) at lower flow rates with respect to the Re number or pressure regime due to the influence of laminarity, the reinforcement has the value of local resistance.

e) The relative increase in sound level resulting from the flow of water in the valve is minimal (± 3 dB (A)), which also predicts an ecologically sound solution.

In terms of flow conditions within the armature, the armature is more hydraulically advantageous, since the number of changes in the direction of flow and the size of the cross-section are negligible.

With regard to design solutions, the exterior design is very simple, allowing for additional retrofitting and easy handling and relatively little installation space.

Claims (2)

PATENT APPLICATIONS 1. A security assembly for water heaters of embodiment I, characterized in that it is easily solved by construction, since they are housed in a housing (1) of length 153 mm, which is manufactured by the hot forging process and consists of two parts, a body (IA) and a nozzle. (IB), threaded and individually glued together into one unit, having all the necessary functional mounting connectors: inlet (a), outlet (b) and heater connector (c) fitted in one axis with all the necessary functional elements: ball valve (2), non-return valve (3) and diaphragm safety valve (4) while maintaining the required functionality and usability, because: - opening pressure of the diaphragm safety valve (4) when tested with water 6bar ± 0,25 and when tested with air 6bar ± 0,4bar - the operation of the non-return valve (3) is faultless in all simulations, ie, as the pressure in the heater increases, the non-return valve completely prevents (shut) the flow of hot water into the network, which ensures a negligible change in the direction of flow of the medium, and at nominal pressure drop Ibar, flow 3,52 m ³ / h, and local pressure losses occur only at lower speeds of the medium due to the influence of 1aminarity. 2. Safety assembly for water heaters, version II, as claimed 1, characterized in that the housing (1), 159 mm in length, is three-piece (fitted with Dutch (IC) connection) and that the outlet pipe (6) is of elbow design, providing even better adaptability to mounting conditions.