EP0466010B1 - A valve assembly for heating plants - Google Patents

A valve assembly for heating plants Download PDF

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Publication number
EP0466010B1
EP0466010B1 EP91111001A EP91111001A EP0466010B1 EP 0466010 B1 EP0466010 B1 EP 0466010B1 EP 91111001 A EP91111001 A EP 91111001A EP 91111001 A EP91111001 A EP 91111001A EP 0466010 B1 EP0466010 B1 EP 0466010B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve assembly
pan
stem
plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91111001A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0466010A1 (en
Inventor
Giuseppe Fugazza
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Individual
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Individual
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Publication date
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Classifications

    • 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
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water

Definitions

  • the present invention concerns a valve assembly of the type comprising a three-way valve with an associated flexible diaphragm control valve, particularly for heating plants that generate also sanitary or domestic hot water.
  • the hot water for heating purposes obtained from a gas-fired boiler or of other kind, is also used for heating (through a water-water heat exchanger) the domestic hot water that is drawn from taps, showers, washing machines and the like.
  • the heating water circuit is separated from the domestic supply water circuit and in order to divert the heating hot water to the heat exchanger when this is required, a three-way valve is used which in turn is controlled or operated by another valve alreadt present in the domestic water supply plant.
  • Such control valve generates a command for the three-way valve and in case for the boiler, when the domestic hot water starts to be drawn.
  • the three-way valve is of the mechanically actuated type, the two valves can be mechanically arranged together to form a single valve assembly or unit.
  • valve assemblies of this type in which the control valve uses the Venturi effect to actuate or drive a rod or a piston opening or closing the three-way valve, but such devices have large load losses in the domestic water supply plant.
  • valve assemblies or double valves using a flexible diaphragm valve for operating the three-way valve, that nevertheless have some shortcomings. Namely in these devices the command rod or stem is quite long and this makes the centering difficult with a resulting difficult and irregular working of the valve assembly. Moreover the flexible diaphragm is rigidly connected to a steel pan and also accomplishes a bypass function together with a disk having thin slots that are easily subjected to be clogged. This valve assembly moreover provides for complicated seal systems to ensure that the heating water circuit and the domestic supply water circuit are kept rigorously separated.
  • the present invention aims to provide a valve assembly of the above mentioned kind that overcomes the above mentioned shortcomings and limitations of the prior art.
  • valve assembly comprising a three-way valve and an associated control valve of mechanical type that are fitted on top of each other, characterized in that such control valve comprises: a discoid-shaped body provided with an inlet duct and an outlet duct; a pan and a flexible diaphragm having a central opening, both located within control valve and axially urged upward by a first helical spring; an axially movable central stop member carrying a first stem projecting upward from said valve body to actuate the overlying three-way valve; the lower portion of said pan carrying a laterally opened central projection that houses a plunger member having an axial hole and a second helical spring urging said plunger member to obstruct said pan opening, said central projection further having a second stem protruding downward from the valve body for actuating additional electric devices.
  • the valve arrangement according to the invention comprises two portions that are mechanically coupled together, but hydraulically separated, that is an upper three-way valve 1 in which heating hot water flows, and a lower control valve 2 of the diaphragm type in which the domestic water flows.
  • the two valves are arranged on top of each other thanks to a collar 50 provided with a flared portion 51 radially projecting from the valve 2 and housed within a lower cylindrical end 54 of the valve 1 having one or more holes 52 for receiving conical fastening screws 53.
  • the actuating mechanical connection is realized by means of a stem or rod 29 projecting from the lower valve 2 and vertically movable, that interacts with a command stem 18 projecting downward from the upper valve 1, as will be explained with more details later on.
  • Sealing rings 55 and 56 ensure the separation and the seal between the two valves.
  • the upper three-way valve comprises two inlet and outlet ducts 11 and 12 respectively, for the heating water circulating through the heating plant, and a third duct 13 along which the hot water from duct 11 can be directed, the duct being connected to a heat exchanger (not shown) in which the heating water can transfer heat to the domestic water before this latter is delivered.
  • a command member is slidably fitted which comprises two stems 14 and 18 with a plunger 15 and 16 carried at each end, respectively, such plungers being provided with guide and reinforcing axially extending members, e.g. located at 120°, and designated with 45 and 48, respectively.
  • the two stems 14 and 18 are axially aligned so that an axial force applied to one of them is axially transmitted to the other.
  • the plungers 15, 16 are of plastic material, integer with the members 45, 48, and each of them is equipped with a peripheral groove for housing a rubber sealing ring (O ring), designated by 61 and 62, respectively.
  • Te lower command stem 18 is actuated by the underlying diaphragm valve 2 by means of a command stem 29 as will be explained with more details later on, whereas a helical spring 19 housed in a spring retainer within the duct 12 urges downwardly the plunger 15.
  • the lower valve 2 comprises a discoid-shaped body or casing made up by two portions 20A and 20B, respectively, provided with an inlet duct 21 and an outlet 22 duct both connected to the domestic water circuit.
  • a flexible diaphragm 24 of plastic or elastomeric material.
  • Such flexible diaphragm has a circular shape, with a central hole, and is clamped along its peripheral edge between the edges of the valve portions 20A and 20B.
  • the inner space of the valve 2 is thus divided into two chambers by the diaphragm 24, namely an upper chamber 2A and a lower chamber 2B.
  • a pan 26 with a central opening is secured to the flexible diaphragm 24 on the side facing the lower chamber 2B.
  • a brass bush 63 is fitted to the pan opening 37 and provided with an outer groove 64 in the upper portion housing the inner lip of the flexible diaphragm 24.
  • the pan 25 has a lower central projection 30 laterally opened or formed with axially extending studs, e.g. by four of such studs located at 90°.
  • the pan and the central projection 30 are formed as a single moulded piece of plastic material. From the bottom of the seat 30 a central rod 26 projects for actuating a switch 66 (shown with phantom lines) e.g. for starting the boiler.
  • the lower surface of the pan 25 is biased by a helical spring 23 having the lower end housed in a spring retainer 28 formed at the bottom of the body portion 2B.
  • the force of the spring 23 is properly selected so that in the rest conditions the spring urges upward the pan 25 and the overlying diaphragm 24 until they abut a central stop member 31 provided with openings 32 for the water passage.
  • the upper portion of the central stop member 31 carries the actuating stem 29 projecting from the collar 50 and capable to act on the stem 18 of the three-way valve.
  • a plunger member 33 urged by an additional helical spring 35 against the opening 37 of the pan.
  • This additional spring 35 has a smaller size and strength than those of the spring 23.
  • the plunger carries a peripheral seal ring 36 and upper guide means 38, and is further equipped with an axial passage hole 34 communicating the chamber 2A with the chamber 2B, and therefore the duct 21 with the duct 22, even when the opening 37 is ostructed by the plunger 33 (position illustrated in the Figures).
  • This hole 34 is calibrated in accordance with the requested flow rate by suitably selecting its diameter.
  • the plunger 33 is formed as a moulded plastic component integral with the guide means 38.
  • valve assembly The working of the valve assembly according to the invention is as follows.
  • the domestic hot water passes through the lower valve 2 through the axial hole 34 and comes out from the outlet duct 22.
  • a depression or pressure difference is created between the chamber 2B and the chamber 2A, and a force is applied to the flexible diaphragm 24 that overcomes the force of the spring 23.
  • the spring 19 is no longer opposed and let the two plungers 15, 16 descend so as to divert the hot water from the duct 11 to the duct 13 (the one of the heat exchanger), at the same time closing the passage toward the duct 12 (the one of the heating plant).
  • microswitch 66 can start, for example, a gas-fired boiler or by other means enable the boiler working in case thi is requested to meet the demand of domestic hot water (through temperature sensors of the heating water).
  • the plunger member 33 opens against the force of the spring 35 when the pressure increases and beside working as a flow limiter (by changing the hole size) it also accomplishes the bypass function of the control valve.
  • the assembly according to the invention which employs two guided short command stems does not have centering problems and the actuation results in being quite smooth. Moreover, when using an assemply according to the invention, it is possible to repair a malfunction affecting the domestic water supply without the need of emptying the heating plant and viceversa.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Details Of Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Temperature-Responsive Valves (AREA)
EP91111001A 1990-07-09 1991-07-03 A valve assembly for heating plants Expired - Lifetime EP0466010B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2088590 1990-07-09
IT02088590A IT1244296B (it) 1990-07-09 1990-07-09 Complesso valvolare per impianti di riscaldamento

Publications (2)

Publication Number Publication Date
EP0466010A1 EP0466010A1 (en) 1992-01-15
EP0466010B1 true EP0466010B1 (en) 1994-02-23

Family

ID=11173553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111001A Expired - Lifetime EP0466010B1 (en) 1990-07-09 1991-07-03 A valve assembly for heating plants

Country Status (3)

Country Link
EP (1) EP0466010B1 (it)
ES (1) ES2049506T3 (it)
IT (1) IT1244296B (it)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1254266B (it) * 1992-03-12 1995-09-14 Gruppo idraulico perfezionato per impianti misti di riscaldamento e acqua sanitaria
DE4427846C2 (de) * 1994-08-05 1997-07-31 Danfoss As Regeleinrichtung für die Temperatur des aus einer Wasserleitung entnommenen Wassers
DE19540816A1 (de) * 1995-11-02 1997-05-07 Bosch Gmbh Robert Umsteuerventil sowie Heizgerät mit einem Umsteuerventil
IT1299650B1 (it) * 1998-03-24 2000-03-24 Michele Rossignoli Valvola deviatrice idropressostatica a commutazione comandata trasversalmente
FR2813950B1 (fr) * 2000-09-14 2002-11-15 Chaffoteaux Et Maury Vanne distributrice hydraulique pour systeme de production d'eau chaude de chauffage et d'eau chaude sanitaire
DE10254239A1 (de) * 2002-11-20 2004-06-03 Honeywell Ag Ventilbaugruppe
DE102006004179B4 (de) * 2006-01-27 2007-10-18 Danfoss A/S Ventilanordnung zum Anschließen eines Wärmetauschers einer Warmwasserentnahmevorrichtung an ein Fernwärmenetz
DE102006004183B4 (de) * 2006-01-27 2007-10-11 Danfoss A/S Ventilanordnung zum Anschließen eines Wärmetauschers einer Warmwasserentnahmevorrichtung an ein Fernwärmenetz
DE102010050953A1 (de) * 2010-11-10 2012-05-10 Oventrop Gmbh & Co. Kg Strömungsmengenregler
DK177911B1 (en) * 2013-03-05 2014-12-15 Danfoss As Heat exchanger valve arrangement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2210261A5 (it) * 1972-12-12 1974-07-05 Peugeot & Renault
DE2553250C3 (de) * 1975-11-27 1981-10-29 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Membranbetätigtes 5/2-Mehrwegeventil
FR2525725A1 (fr) * 1982-04-23 1983-10-28 Sdecc Perfectionnement aux vannes a trois voies

Also Published As

Publication number Publication date
IT9020885A1 (it) 1992-01-09
IT1244296B (it) 1994-07-08
EP0466010A1 (en) 1992-01-15
ES2049506T3 (es) 1994-04-16
IT9020885A0 (it) 1990-07-09

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