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EP 0 568 122 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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11.12.1996 Bulletin 1996/50 |
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Date of filing: 04.03.1993 |
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A valve assembly for plants providing both heating and domestic hot water
Ventilanordnung für Anlagen, die sowohl für Heizungs- als auch für Haushaltsheisswasser
vorgesehen ist
Arrangement de soupape prévu pour installations de chauffage ainsi que pour chauffe-eau
domestique
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Designated Contracting States: |
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DE ES FR GB |
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Priority: |
12.03.1992 IT MI920575
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Date of publication of application: |
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03.11.1993 Bulletin 1993/44 |
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Proprietor: FUGAS s.r.l. |
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I-20090 Trezzano sul Naviglio (Milan) (IT) |
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Inventor: |
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- Fugazza, Giuseppe
I-20090 Trezzano sul Naviglio (Milano) (IT)
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Representative: Robba, Eugenio et al |
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Studio "INTERPATENT"
via Caboto 35 10129 Torino 10129 Torino (IT) |
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References cited: :
EP-A- 0 226 246 AT-B- 389 584
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EP-A- 0 466 010 DE-A- 3 406 104
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention concerns a valve assembly adapted for being used in combined
plants for providing both heating and sanitary hot water, i.e. residential plants
wherein the same heat source, particularly a wall gas-fired boiler, is used for heating
both the water for the heat radiating elements (radiators) for heating the rooms,
and the sanitary or domestic hot water for various purposes (EP-A-0 466 010).
[0002] The known plants of this type although advantageous from the costs and environment
viewpoint, have a number of drawbacks, and more precisely require piping, valves and
various components that are often connected in non-standard manner and lead to cumbersome
and complicated arrangements, and in case also irrational, that are difficult to be
assembled and ackward for any possible maintenance intervention. This situation negatively
affects also the cost and the reliability level of the plants.
[0003] The object of the present invention is that of overcoming the above mentioned shortcomings
and limitations and more precisely of providing a valve arrangement or assembly for
realizing plants of the above mentioned type, which is extremely compact, easy to
be connected to the remaining of the plant, that allows an easy and simplified maintenance,
and has quite limited costs, both for its construction and installation.
[0004] According to the invention, such objects are achieved through a valve assembly for
combined plants adapted for providing both heating and sanitary hot water and comprising
a gas-fired boiler, a main heat exchanger, a water/water heat exchanger that can be
included in the circuit of the heating water by means of a three-way valve, at least
one radiator, and a pump for circulating the heating water, characterized in that
said valve assembly comprises two sub-assemblies or valve units, the first unit comprising
an integral metal block in which there are formed or mounted said three-way valve,
a pipe fitting for the connection with said main heat exchanger, a pipe fitting for
the connection with said at least one radiator, a pipe fitting for the outlet of the
domestic hot water, two pipe fittings for the connection with said water/water heat
exchanger, said integral metal block further housing a pressure switch and a by-pass
valve with an associated outlet fitting; said second unit comprising an integral metal
block in which there are formed or mounted a pressure difference device, a pipe fitting
for the connection with said at least one radiator, a pipe fitting for the inlet of
the domestic water, an outlet pipe fitting to said pump, two pipe fittings for the
connection with said water/water heat exchanger.
[0005] Additional advantageous features are the objects of the dependent claims.
[0006] The assembly according to the invention has a reduced size and provides for original
solutions. More particularly it is equipped with an advantageous device exploiting
the pressure difference for controlling a three-way valve in lieu of the known arrangements,
e. g. provided with a Venturi tube. Such novel pressure difference device can further
include a flow rate regulator, if necessary and without any modification thereof.
The assembly of the invention incorporates a pressure switch, a by-pass valve and
a number of pipe fittings and sections already designed for accomplishing functions
of the system so that the installation of this latter is very simple and advantageous.
[0007] The invention will now be described with reference to the attached drawings illustrating
preferred but non-limiting embodiments thereof, in which:
Fig. 1 schematically illustrates the construction of the valve assembly according
to the present invention;
Fig. 2 is a front view of the valve assembly according to the invention;
Fig. 3 is a top view of the assembly of Fig. 2;
Fig. 4 is a side view of the assembly of Fig. 2;
Fig. 5 illustrates the structure of the unit I;
Fig. 6 is a cross section along line B-B in Fig. 5;
Fig. 7 is a cross section along line C-C in Fig. 5;
Fig. 8 is a cross section along line A-A in Fig. 5;
Fig. 9 illustrates the structure of the unit II;
Fig. 10 is a cross section along line B-B in Fig. 9;
Fig. 11 is a cross section along line A-A in Fig. 9;
Fig. 12 is a cross section along line C-C in Fig. 9;
Fig. 13 illustrates the structure of the pressure difference device according to the
invention; and
Fig.s 14 and 15 schematically illustrate two alternative constructions of the valve
assembly according to the present invention.
[0008] Fig. 1 is a diagram illustrating the construction of the valve assembly according
to the invention in a residential heating plant also capable of producing domestic
hot water, i. e. a plant capable of heating water circulating in a closed circuit
which includes heat radiating elements, and of supplying upon request domestic hot
water for various uses, by employing the same heat source, more particularly a gas-fired
boiler. Specific and/or preferred embodiments of the assembly and of the components
thereof are shown in Fig.s 2 to 4 and 5 to 12, respectively.
[0009] Through a (main) finned heat exchanger 2 the gas-fired boiler 1 heats the water circulated
within a heating circuit by a pump P. The heated water passes through a three-way
valve 4 which usually delivers the water to the radiators or radiating elements schematically
represented by one element R, through the heating delivery pipe 5 and returns via
the return pipe 6 to the pump P.
[0010] Upon a request of domestic hot water, the three-way valve 4 closes the passage 5
to the radiators and supplies the hot water to a second water/water heat exchanger
17 (e.g. of the plate type) where the domestic hot water from the pipe 8 (that is
from the water system) and which is delivered through the output pipe 9 to the taps
for erogating the hot water, one of them being schematically indicated by RE in the
Figure.
[0011] The valve assembly according to the invention is shown in Fig.s 2 to 4 and substantially
comprises two sub-assemblies or valve units made up as two blocks I and II. The construction
of block I or delivery distributor is illustrated in details in Fig.s 5 to 8.
[0012] As shown in Fig. 1 in the rectangular dashed frame labeled with I, and also with
reference to Fig.s 2 to 4, the first unit I comprises a three-way valve 4, a spigot
or pipe fitting 3 for the connection with the main heat exchanger 2, a spigot or pipe
fitting 5 for the connection with the radiator R, an input spigot or pipe fitting
9 for the sanitary water, and two spigots or pipe fittings 22, 23 connecting the unit
with said water/water heat exchanger 17.
[0013] The three-way valve 4 in the left part of unit I is actuated by a diaphragm valve
12 which is fitted into a properly threaded seat 38 of the unit. It comprises a housing
120 within which a diaphragm 121 is movable with an associated pushing head or pan
122 which drives a rod 123 which in turn is connected to the stem of the valve 4.
Such valve 4 in turn houses two valve bodies 42 and 43 axially urged by a return spring
44 in the housing 40 of the valve 4.
[0014] The inner space of the control valve 12 is divided into two chambers, each provided
with a supply duct 124 and 125, respectively for low and high pressure, the further
connections of which will be illustrated later on with reference to pressure difference
device 14. A further return spring 126 is preloaded in such a manner as to overcome
the force of the spring 44 in the three-way valve. An axially located rod or spindle
127 is connected at one end with the pan 122 while its other end protrudes upwards
from the valve housing for actuating a microswitch 128 enabling the start of the pump
P upon a request of domestic hot water in periods when the boiler is not burning.
In the assembly according to the invention the ignition of the burner is caused by
a second microswitch 155 actuated by a pressure switch 15 as described later on.
[0015] As can better be seen in Fig. 5, the valve 12 is fitted to the unit 1 by screwing
it over the pipe fitting 38 and can easily be dismounted for the maintenance and in
case the replacement of parts thereof.
[0016] A conceptually similar arrangement with a three-way valve and a diaphragm control
valve is disclosed the EP-A-0 466 010 to which reference is made for further details.
[0017] A port or opening 30 is provided in the first unit I in correspondence with the pipe
fitting 3 and allows for the introduction of a temperature probe, typically a (not
shown) thermistor.
[0018] To an additional pipe fitting 48 of the three-way valve 4 there are connected a by-pass
valve 16 and a pressure switch 15 actuated by a pressure difference for opening the
burner-enabling microswitch 155 in case the water level within the heating system
is low and/or the pressure is null (due to a blocked pump). Such arrangement advantageously
prevents the burner from being ignited in the above mentioned circumstances which
in the known systems could cause drawing poca water at very high temperature (with
the risk of scalds) before the intervention of the protection termostato provided
for in such systems.
[0019] Referring also to Figures 5 to 8, and particularly to Fig. 6, such pressure switch
device 15 comprises a chamber 150 formed near the fixture housing the by-pass valve
(illustrated later on), and divided into two portions by a diaphragm 151. One of such
portions being connected through a passage 165 with the three-way valve, and the other
portion being connected through a passage 164 to a point before the pump P, i.e. to
a lower pressure area.
[0020] A pan 152 urged by a coil spring 154 and provided with a stem or spindle 153 protruding
from the chamber 150 for actuating the microswitch 155 abuts against the diaphragm
151. When water is present in the system, the water is pressurized by the pump P on
the side of the valve 4, with the other side being at a lower pressure, and the so
formed pressure difference acts on the diaphragm 151 that actuates the safety microswitch
155.
[0021] The pipe fitting 48 is further connected to the by-pass valve 16, also illustrated
in Fig. 6, which comprises a threaded metal duct 166 engaging the thread 161 of the
pipe fitting 160 and carries a valve body 162 provided with longitudinal passages
and urged by a coil spring 163.
[0022] When the pressure difference between the delivery and the return pipes reaches a
(high) predetermined level, e.g. due to large frictional losses in the radiators,
the by-pass valve opens and a portion of the water is recirculated through the by-pass
pipe section 10A provided for supplying a certain amount of water to the main heat
exchanger 2 under any circumstances.
[0023] The above by-pass valve is for example of the type disclosed in the Italian Utility
Model application No. MI91U 000577 filed on June 25, 1991 and entitled "By-pass valve
for hydraulic plants" to which reference is made for further details.
[0024] Unit I further provides two pipe fittings 22 and 23 for the connection with the water/water
heat exchanger 17, for the inlet of the heating water and the outlet of the domestic
heated water, respectively.
[0025] The second unit or valve sub-assembly II is shown as framed by a dashed line in Fig.
1. The construction of such block II, also called primary return distributor, is illustrated
in details in Figures 9 to 12. It comprises the following components that are formed
or mounted as an integral component.
[0026] A device 14 activated by a pressure difference is housed in the main duct 60 for
the domestic water (see Fig. 10) that will be illustrated with more details later,
a pipe fitting 6 for the connection to the radiator(s) R, an inlet pipe fitting 8
for the domestic water, an outlet pipe fitting 7 to the pump, and two pipe fittings
32, 33 for the connection to said water/water heat exchanger 17.
[0027] As can be seen in Fig. 13, the device 14 comprises a threaded locking ring 140 (which
fits the duct 60), a valve body 141 having an orifice 145 and located at one end of
a coil spring 146, and a spacer 147 formed as a cage of plastic material crimped or
otherwise fixed to the ring in order to act like a spring stop.
[0028] Upon the opening of the tap RE for drawing domestic hot water, the water coming from
the water inlet tube 8 and directed to the plate-type heat exchanger 17 via the pipe
143, initially passes an orifice 145 in the valve body 141 as long as its flow rate
is less than a predetermined value, e.g. 2 liters/min. When the draw of domestic hot
water increases, the force of the spring 146 is overcome and water can pass also around
the valve body 141.
[0029] Thus the by-pass device is opened at a predetermined pressure level which is determined
by the spring characteristics.
[0030] When the water flows, the value of the pressure in the water system is available
in the pipe section 142, whereas the value of the pressure drop is made available
outside the valve 14 by the pipe section 144. These two sections are connected with
the pipe fittings 125 and 124, respectively, of the diaphragm valve 12.
[0031] As it is clearly seen in Fig. 13, the pressure difference device 14 is dimensioned
for housing a flow rate regulator 80 (a so called Mannesmann valve) that keeps the
flow rate constant even if the pressure varies. Such known valve employs a rubber
seal of the O ring type that is deformed in accordance with the pressure and therefore
progressively narrows the passage when the pressure increases.
[0032] Such regulator is useful for keeping the flow rate constant, as requested, even when
the local pressure of the water is rather high and the tap fully opened, thus avoiding
a situation in which water not heated enough is supplied to the user. In case the
pressure of the water system is low, the regulator is not used, that is such a regulator
is not fitted in the device since it causes a remarkable pressure drop. In the pressure
difference device there are further incorporate a metal ring 81 for fastening the
regulator 80, and a metal mesh cylindrical filter 82, with a plug 61 closing the duct
60 at the right end.
[0033] According to the invention, the replacement of the regulator, e.g. when this latter
becomes clogged due to limestone or ageing, is quite simple. The cost of the regulator
is very low and the replacement thereof very quick, the more so when compared with
present devices equipped with an associated nut or additional components. Moreover
the protection filter formed as a metal mesh is housed in the body of the device without
requiring additional components.
[0034] As can better be seen in Fig. 10, a tap 21 for the feedwater makeup of the heating
system is fitted into a seat formed at an angle on the pipe fitting 8, and laterally
to the duct 60 housing the pressure difference device, there is formed a duct 65 which
is longitudinally divided and houses at one end a check valve 13 comprising a threaded
plug 67 and an axially located coil spring 68 with this later carrying at its other
end a valve body 69 equipped with an O rig 70.
[0035] The above arrangement realizes a check valve 13 incorporated in the group of the
invention, so that the water for filling the circuit and coming from the water system
via the filling tap 21 must overcome the spring force in order to open the communication
passage. This way it is prevented the risk that the heating water can accidentally
reach the domestic water circuit (usually containing drinkable water) in case the
pressure in the water system is too low, or when there is no water in the system,
e.g. after a draining for a maintenance or repairing operation.
[0036] In accordance with another embodiment of the invention which is illustrated with
some components carried ouside in Fig. 10, the group further includes a tap for draining
the heating system. According to such embodiment the plug 67 is axially bored and
communicating with the inside of duct 65 via a passage 83, and contains a closing
plunger actuated by an outer knob 80.
[0037] In the second group several different components necessary for its proper working
are formed or mounted as clearly shown in Figures 2 to 4.
[0038] More precisely a pipe fitting 51 for a pressure gauge is formed near the pipe fitting
7, and a fitting 11 for an expansion tank 71 adapted to accomodate the water dilatation
is realized near the former. Moreover on the pipe fitting 6 for the heating water
return there is provided a fitting 18 for mounting a safety valve (not shown).
[0039] Between the units I and II there is located a highly effective plate-type heat exchanger
17 of known design featuring very low flow resistance and a size that is small and
can be varied during the manufacturing thereof in accordance with the requested flow
rate.
[0040] In the known plants problems are encountered in realizing the connections to the
water/water heat exchanger due to the reduced distances therefrom and to the small
size of the heat exchanger. This render the production complicate requiring a high
manufacturing accuracy which further renders troublesome the maintenance since the
components are difficult to access by wrenches and other tools.
[0041] The manner by which the plate-type heat exchanger and the two units are connected
together is shown in Fig. 4 for the first unit, that is for the heating hot water
inlet and the domestic hot water outlet. More precisely the first connection is carried
out through a pipe fitting 22 engaging a tightening nut 29 to be screwed on a threaded
pipe fitting 24 of the plate-type heat exchanger 17, while for the oulet of the domestic
hot water there is provided a smooth pipe fitting 23 receiving a smooth pipe fitting
27 of the heat exchanger, equipped with a seal ring (e.g. an O ring) 28 received in
a groove. A similar arrangement is provided for the second unit that realizes the
outlet connection for the heating hot water and the inlet connection for the domestic
water (pipe fittings 32 and 33 in Fig. 11).
[0042] The tightening the upper nuts causes a tie rod action that brings about also the
connection of the lower smooth fittings, with the seal being ensured by the seal rings.
Thanks to the above mentioned action, for releasing the heat exchanger there is required
the loosening of two nuts only (or their tightening for the assembling therof).
[0043] Fig. 14 schematically illustrate an embodiment of the present invention which is
particularly useful for a vertical mounting, whereas the embodiment shown in Fig.
15 is particularly preferred when the pipe fittings 5, 6 and 8, 9 are horizontal.
The same numeral references of Figures 2 and 3 have been used in both Figures 14 and
15 for indicating equal or substantially equivalent parts.
1. A valve assembly for combined plants adapted for providing both heating and sanitary
hot water and comprising a gas-fired boiler (1), a main heat exchanger (2), a water/water
heat exchanger (17) that can be included in the circuit of the heating water by means
of a three-way valve (4), at least one radiator (R), and a pump (P) for circulating
the heating water, characterized in that said valve assembly comprises two sub-assemblies
or valve units, the first unit (I) comprising an integral metal block in which there
are formed or mounted said three-way valve (4), a pipe fitting (3) for the connection
with said main heat exchanger (2), a pipe fitting (5) for the connection with said
at least one radiator (R), a pipe fitting (9) for the outlet of the domestic hot water,
two pipe fittings (22, 23) for the connection with said water/water heat exchanger
(17), said integral metal block further housing a pressure switch (15) and a by-pass
valve (16) with an associated outlet fitting (10); said second unit (II) comprising
an integral metal block in which there are formed or mounted a pressure difference
device (14), a pipe fitting (6) for the connection with said at least one radiator
(R), a pipe fitting (8) for the inlet of the domestic water, an outlet pipe fitting
(7) to said pump (P), two pipe fittings (32, 33) for the connection with said water/water
heat exchanger (17).
2. A valve assembly as claimed in claim 1, characterized in that on said first unit (I)
there is mounted a diaphragm valve (12) equipped with a rod (123) for actuating said
three-way valve (4), the chamber (120) of said valve being divided by said diaphragm
(121) into two portions that are supplied via two pipe fittings (124, 115) adapted
to be connected to points of said second unit (II) between which a pressure difference
exists, said diaphragm valve (12) further comprising a return spring (126) stronger
than the spring (44) provided in said three-way valve (4), and a further rod (127)
for actuating a microswitch (128) enabling the start of said pump (P).
3. A valve assembly as claimed in claim 1 or 2, characterized in that said pressure switch
(15) comprises a chamber (150) formed near the pipe fitting (160) housing the by-pass
valve (16), that said chamber is divided into two portions by a diaphragm (151), one
of said portions being connected through a first passage (165) to said three-way valve
(4), and the other portion being connected through a second passage (164) to a point
before said pump (P), said pressure switch (15) further comprising a pan (152) urged
by a spring (154) and provided with a stem (153) actuating a second microswitch (155)
controlling the ignition of the gas burner.
4. A valve assembly as claimed in claim 3, characterized in that said by-pass valve (16)
comprises a metal threaded duct (166) engaging the thread (161) of said duct (160)
and carrying a valve body (162) having longitudinal passages and being urged by a
return spring (163).
5. A valve assembly as claimed in claim 4, characterized in that said it further provides
a connecting pipe section (10A) between said by-pass valve (16) in the first unit
(I) and the outlet pipe fitting (7) towards the pump (P) in the second unit (II).
6. A valve assembly as claimed in the preceding claims, characterized in that said pressure
difference device (14) comprises a threaded locking ring 140 which fits the duct 60,
a valve body (141) having an orifice (145) and located at one end of a coil spring
(146) and axially movable within said duct (60), a spacer (147) and a plug (61) for
closing the end of said duct (60).
7. A valve assembly as claimed in claim 6, characterized in that said pressure difference
device (14) houses a flow regulator (80) of the so called Mannesmann valve type, that
maintains the flow rate constant when the pressure varies, a metal ring (81) for fastening
the regulator (80), and a metal mesh cylindrical filter (82).
8. A valve assembly as claimed in claim 1, characterized in that said second unit (II)
comprises a tap (21) for the waterfeed makeup of the heating circuit.
9. A valve assembly as claimed in claim 8, characterized in that it comprises a duct
(65) which is longitudinally divided and houses at one end a check valve (13) comprising
a threaded plug (67) and a coil spring (68) axially located thereon, said spring (68)
carrying at its other end a valve body (69) equipped with an O rig (70), and in that
said plug (67) is axially bored and communicating with the inside of said duct (65)
via a passage (83), and contains a closure plunger actuated by an outer knob (80)
for draining the heating circuit.
10. A valve assembly as claimed in the preceding claims, characterized in that said second
unit (II) comprised a pipe fitting (51) for a pressure gauge, a pipe fitting (11)
for an expansion tank, and a pipe fitting (18) for a safety valve in the return pipe
(6) for the heating water.
1. Ventilanordnung für kombinierte Anlagen, die dazu vorgesehen sind, um sowohl Heizungs-
als auch Sanitärwarmwasser zur Verfügung zu stellen und die einen gasbeheizten Boiler
(1), einen Hauptwärmetauscher (2), einen Wasser/Wasser-Wärmetauscher (17), der in
den Kreislauf des Heizungswassers mittels eines Dreiwegeventils (4) einbeziehbar ist,
zumindest einen Heizkörper (R) sowie eine Pumpe (P) zur Umwälzung des Heizungswassers
aufweisen, dadurch gekennzeichnet, daß die genannte Ventilanordnung zwei Unteranordnungen
oder Venileinheiten besitzt, die erste Einheit (I) einen einstückigen Metallblock
aufweist, in dem das genannte Dreiwegeventil (4), ein Rohranschluß (3) für die Verbindung
mit dem genannten Hauptwärmetauscher (2), ein Rohranschluß (5) für die Verbindung
mit dem genannten zumindest einen Heizkörper (R), ein Rohranschluß (9) für den Auslaß
des Haushaltswarmwassers und zwei Rohranschlüsse (22, 23) für die Verbindung mit dem
genannten Wasser/Wasser-Wärmetauscher (17) ausgebildet oder angebracht sind, wobei
der genannte einstückige Metallblock außerdem einen Druckschalter (15) und ein Nebenstromventil
(16) mit einem zugehörigen Auslaßanschluß (10) beherbergt; die zweite Einheit (II)
einen einstückigen Metallblock besitzt, in dem eine Druckdifferenzvorrichtung (14),
ein Rohranschluß (6) für die Verbindung mit dem zumindest einen Heizkörper (R), ein
Rohranschluß (8) für den Einlaß des Haushaltswassers, ein Auslaß-Rohranschluß (7)
zu der genannten Pumpe (P) und zwei Rohranschlüsse (32, 33) für die Verbindung mit
dem genannten Wasser/Wasser-Wärmetauscher (17) ausgebildet oder angebracht sind.
2. Ventilanordnung wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, daß an der
genannten ersten Einheit (1) ein Membranventil (12) angebracht ist, das mit einer
Stange (123) für die Betätigung des genannten Dreiwegeventils (4) ausgerüstet ist,
daß die Kammer (120) des genannten Ventils durch die genannte Membrane (121) in zwei
Teile unterteilt ist, die über zwei Rohranschlüsse (124, 115) versorgt werden, die
dazu vorgesehen sind, um mit Stellen der genannten zweiten Einheit (II) verbunden
zu werden, zwischen denen ein Druckunterschied herrscht, wobei das genannte Membranventil
(12) außerdem eine Rückstellfeder (126), die stärker ist als die in dem genannten
Dreiwegeventil (4) vorgesehene Feder (44) ist, sowie eine weitere Stange (127) aufweist,
um einen Mikroschalter (128) zu betätigen, der das Anlaufen der genannten Pumpe (P)
ermöglicht.
3. Ventilanordnung wie in Anspruch 1 oder 2 beansprucht, dadurch gekennzeichnet, daß
der genannte Druckschalter (15) eine Kammer (150) besitzt, die in der Nähe des Rohranschlusses
(160), der das Nebenstromventil (16) beherbergt, ausgebildet ist, daß die genannte
Kammer durch eine Membrane (151) in zwei Teile unterteilt ist, wobei einer dieser
genannten Teile über einen ersten Durchgang (165) mit dem genannten Dreiwegeventil
(4) und der andere Teil über einen zweiten Durchgang (164) mit einem vor der genannten
Pumpe (P) liegenden Stelle verbunden ist, daß der genannte Druckschalter (15) außerdem
einen Teller (152) aufweist, der durch eine Feder (154) vorgespannt und mit einem
Schaft (153) versehen ist, der einen zweiten Mikroschalter (155) betätigt, um die
Zündung des Gasbrenners zu steuern.
4. Ventilanordnung wie in Anspruch 3 beansprucht, dadurch gekennzeichnet, daß das genannte
Nebenstromventil (16) einen metallischen, mit Gewinde versehenen Durchgangsteil (166)
aufweist, der mit dem Gewinde (161) des genannten Rohranschlusses (160) in Eingriff
ist und einen Ventilkörper (162) trägt, der längsverlaufende Durchgänge besitzt und
durch eine Rückstellfeder (163) vorgespannt ist.
5. Ventilanordnung wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, daß sie außerdem
einen Verbindungsrohrabschnitt (10A) zwischen dem genannten Nebenstromventil (16)
in der ersten Einheit (I) und dem in der zweiten Einheit (II) gegen die Pumpe (P)
hin führenden Auslaßrohranschluß (7) besitzt.
6. Ventilanordnung wie in den vorausgehenden Ansprüchen beansprucht, dadurch gekennzeichnet,
daß die genannte Druckdifferenzvorrichtung (14) einen mit Gewinde versehenen Sperring
(140) aufweist, der in den Kanal (60) paßt, wobei ein Ventilkörper (141) eine Öffnung
(145) besitzt und am einen Ende einer Schraubenfeder (146) angeordnet und innerhalb
des genannten Kanales (60) axial beweglich ist und ein Abstandhalter (147) und ein
Stopfen (61) zum Verschließen des Endes des genannten Kanales (60) vorgesehen sind.
7. Ventilanordnung wie in Anspruch 6 beansprucht, dadurch gekennzeichnet, daß die genannte
Druckdifferenzvorrichtung (14) einen Strömungsregler (80) von der Art eines sogenannten
Mannesmann-Ventils, welcher die Durchflußrate konstant hält, wenn der Druck schwankt,
einen Metallring (81) zur Befestigung des Reglers (80) sowie ein zylindrisches metallisches
Filtersieb (82) beherbergt.
8. Ventilanordnung wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, daß die genannte
zweite Einheit (II) einen Hahn (21) für eine Beschickung des Heizungskreislaufes mit
Wasser aufweist.
9. Ventilanordnung wie in Anspruch 8 beansprucht, dadurch gekennzeichnet, daß sie einen
Durchgang (65) aufweist, der in Längsrichtung abgeteilt ist und am einen Ende ein
Rückschlagventil (13) beherbergt, das einen Gewindestopfen (67) und eine darauf axial
angeordnete Schraubenfeder (68) aufweist, wobei die genannte Feder (68) an ihrem anderen
Ende einen Ventilkörper (69) trägt, der mit einem O-ring (70) versehen ist, und daß
der genannten Stopfen (67) axial durchbohrt, über einen Durchlaß (83) mit der Innenseite
des genannten Kanales (65) in Verbindung ist und einen Verschlußplunger enthält, der
durch einen äußeren Knopf (80) betägigbar ist, um den Heizungskreislauf zu entwässern.
10. Ventilanordnung wie in den vorausgehenden Ansprüchen beansprucht, dadurch gekennzeichnet,
daß die genannte zweite Einheit (II) einen Rohranschluß (51) für einen Druckmesser,
einen Rohranschluß (11) für ein Ausgleichsgefäß und einen Rohranschluß (18) für ein
Sicherheitsventil in der Rücklaufleitung (6) für das Heizungswasser aufweist.
1. Ensemble de soupape pour des installations mixtes adaptées pour produire de l'eau
de chauffage et de l'eau chaude à usage domestique et comprenant une chaudière à gaz
(1), un échangeur de chaleur principal (2), un échangeur de chaleur eau/eau (17) qui
peut être inclus dans le circuit d'eau de chauffage au moyen d'une triple-valve (4),
au moins un radiateur (R) et une pompe (P) pour faire circuler l'eau de chauffage,
caractérisé en ce que ledit ensemble de soupapes comprend deux sous-ensembles ou
unités de soupape, la première unité (I) constituée par un bloc intégral en métal
dans lequel sont formés ou montés ladite triple-valve (4), un raccord de tuyauterie
(3) pour le branchement audit échangeur de chaleur principal (2), un raccord de tuyauterie
(5) pour le branchement audit au moins un radiateur (R), un raccord de tuyauterie
(9) pour la sortie d'eau chaude à usage domestique, deux raccords de tuyauterie (22,
23) pour le branchement avec ledit échangeur de chaleur eau/eau (17), ledit bloc intégral
en métal servant en outre de logement à un pressostat (15) et à une soupape de dérivation
(16) avec un raccord de sortie qui lui est associée (10); cette dite seconde unité
(II) comprenant un bloc intégral en métal dans lequel sont formés ou monté un dispositif
à pression différentielle (14), un raccord de tuyauterie (6) pour le branchement audit
au moins un radiateur (R), un raccord de tuyauterie (8) pour l'arrivée d'eau à usage
domestique, un raccord de tuyauterie de sortie (7) de branchement à ladite pompe (P),
deux raccords de tuyauterie (32, 33) pour le branchement audit échangeur de chaleur
eau/eau (17).
2. Ensemble de soupape selon la revendication 1,
caractérisé par le fait que sur ladite première unité (I) est monté un clapet à
diaphragme (12) équipé d'une tige (123) pour actionner ladite triple-valve (4), la
chambre (120) de ladite valve étant divisée par ledit diaphragme (121) en deux portions
qui sont alimentées par l'intermédiaire de deux raccords de tuyauterie (124, 115)
prévus pour être branché en des points de ladite seconde unité (II) entre lesquels
une différence de pression existe, ledit clapet à diaphragme (12) comprenant en outre
un ressort de rappel (126) plus raide que le ressort (44) placé dans ladite triple-valve
(4) et une autre tige (127) pour actionner un micro-interrupteur (128) qui permet
le démarrage de ladite pompe (P).
3. Ensemble de soupape selon la revendication 1 ou la revendication 2,
caractérisé par le fait que ledit pressostat (15) comprend une chambre (150) formée
prés du raccord de tuyauterie (160) logeant la soupape de dérivation (16), que cette
dite chambre est divisée en deux portions par un diaphragme (151), une desdites portions
étant branchée au travers d'un premier passage (165) à ladite triple-valve (4), et
l'autre portion étant branchée au travers d'un second passage (164) à un point situé
avant ladite pompe (P), ledit pressostat (15) comprenant en outre une cuvette (152)
sollicitée poussée par un ressort (154) et équipée d'une queue (153) actionnant un
second micro-interrupteur (155) qui contrôle l'allumage du brûleur à gaz.
4. Ensemble de soupapes selon la revendication 3,
caractérisé par le fait que la soupape de dérivation (16) comprend un conduit métallique
fileté (166) qui s'engage sur le filetage (161) dudit conduit (160) et qui contient
un clapet (162) ayant des trous de passage longitudinaux et qui est sollicité par
un ressort de rappel (163).
5. Ensemble de soupape selon la revendication 4,
caractérisé par le fait qu'il comporte en outre une section de tuyauterie de connexion
(10A) entre ladite soupape de dérivation (16) dans la première unité (I) et le raccord
de tuyauterie de sortie (7) vers la pompe (P) dans la seconde unité (II).
6. Ensemble de soupape selon l'une quelconque des revendications qui précédent,
caractérisé par le fait que ledit dispositif à pression différentielle (14) comprend
un bague de serrage filetée (140) qui s'ajuste sur le conduit (60), un clapet (141)
ayant un orifice de passage (145) et placé à une extrémité d'un ressort hélicoïdal
(146) et qui se déplace axialement à l'intérieur dudit conduit (60), une entretoise
(147) et un bouchon (61) pour obturer l'extrémité dudit conduit (60).
7. Ensemble de soupape selon la revendication 6,
caractérisé par le fait que ledit dispositif à pression différentielle (14) sert
de logement à un régulateur de débit (80) de type dit à soupape Mannesmann, qui maintient
le débit constant lorsque la pression varie, à une bague métallique (81) pour fixer
le régulateur (80) et un filtre cylindrique en toile métallique (82).
8. Ensemble de soupape selon la revendication 1,
caractérisé par le fait que ladite seconde unité (II) comporte un robinet (21)
pour l'appoint en eau du circuit de chauffage.
9. Ensemble de soupape selon la revendication 8,
caractérisé par le fait qu'il comprend un conduit (65) qui est divisé longitudinalement
et loge à une extrémité un clapet de sûreté (13) comprenant un bouchon fileté (67)
et un ressort hélicoïdal (68) axialement logé sur ce bouchon, ledit ressort (68) ayant
à son autre extrémité un clapet (69) équipé d'un joint torique (70),
et par le fait que ledit bouchon (67) est alésé axialement et communique avec l'intérieur
dudit conduit (65) par l'intermédiaire d'un orifice de passage (83), et contient un
plongeur de fermeture actionné par un bouton extérieur (80) pour vidanger le circuit
de chauffage
10. Ensemble de soupape selon n'importe laquelle revendication précédente,
caractérisé par le fait que ladite seconde unité (II) comprend un raccord de tuyauterie
(51) pour un manomètre, un raccord de tuyauterie (11) pour un ballon d'expansion,
et un raccord de tuyauterie (18) pour un clapet de sûreté dans la tuyauterie de retour
(6) pour l'eau de chauffage.