US3258203A - Hot-water heating system - Google Patents

Hot-water heating system Download PDF

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Publication number
US3258203A
US3258203A US386625A US38662564A US3258203A US 3258203 A US3258203 A US 3258203A US 386625 A US386625 A US 386625A US 38662564 A US38662564 A US 38662564A US 3258203 A US3258203 A US 3258203A
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United States
Prior art keywords
water
coil
hot
valve
heat exchanger
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Expired - Lifetime
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US386625A
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English (en)
Inventor
Kurz Adolf
Heinz Van Lier
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Junkers and Co GmbH
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Junkers and Co GmbH
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste
    • G05D23/023—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste the sensing element being placed outside a regulating fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/087—Regulating fuel supply conjointly with another medium, e.g. boiler water using mechanical means
    • 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
    • F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
    • 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
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste
    • G05D23/022—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste the sensing element being placed within a regulating fluid flow

Definitions

  • the heat exchanger In many presently known hot-water heating systems wherein the source of hea-t comprises a gasJheated heat exchanger, the heat exchanger normally comprises one or more packages of laminations or fins which surround a length of the water containing coil and are heated by flames or gaseous products of combusti-on produced by a gas burner.
  • a serious drawback of such hot-Water heating systems is that the spaces between the ns of the heat exchanger :become clogged after short periods of use to thereby reduce the efficiency of the heat exchanger.
  • hot-water heating systems normally comprise a motordriven circulating pump ywhich operates intermittently in response to impulses received from a room thermostat or from another starting device to cause circulation of water through the coil.
  • the pump When the pump is started, it begins to circulate a stream of cold water, or comparatively cold water, which ows through the heat exchanger. Since the rate at which the water is circulated in response to operation of the pump is determined in advance, the quantity of water flowing through the heat exchanger is constant and the latter transmits to such water ⁇ a certain quantity of heat energy. Consequently, the heating effect is low when the circulating pump is started, which means that the exposed surfaces of the fins are coated with a layer of condensate which is drawn from the surrounding -air and promotes the clogging of spaces between the adjoining fins.
  • the hot-water heating system must comprise two heaters, two burners and a correspondingly Patented June 28, 1966 ICB kincreased number of valves, piping, control elements and other accessories which Vadd to the bulk, cost and complicatedness of the assembly.
  • Another object of the invention is to provide a hotwater heating system whose operation is automatic and wherein a small number of comparatively simple auxiliaries suliices to prevent clogging of spaces between the fins of the heat exchanger.
  • a further object of the invention is to provide ⁇ a hotwater heating system wherein the heating of the heat exchanger produces little noise and wherein the admission of -fuel to the burner or burners may take place in a fully automatic way and at low water pressure.
  • the burner heats the tins of a heat exchanger which is provided along la length of the coil, and the throttling action of the 4thermostat valve is suchthat the spaces between the tins cannot accumulate condensate 4from surrounding air because the flow of water is throttled Suthciently to insure rap-id heating of water in the heat eX- changer to a temperature which is so high that the exchange of heat between the ns and water'does not result in cooling of fins to a temperature at which the deposition of condensate can take place.
  • FIG. 1 is a somewhat schematic view of a forcedc1rculation hot-water heating system which is constructed in accordance with a first embodiment of the present invention, certain portions of the heating system being shown in section;
  • FIG. 2 is -a central vertical sec-tion through la throttling device which is utilized in the heating system of FIG. ⁇ 1;
  • FIG. 3 i-s a horizontal section as seen in the direction of arrows from the line IV-lV of FIG. 2;
  • FIG. 4 is a Vertical section through the thermostat valve of the throttling device a-s seen in the direction of arrows from line 1V-IV of FIG. 2;
  • FIG. 5 is a schematic view of a modified hot-waterheating system
  • 1and FIG. 6 is a similar schematic view of a third hot-water heating system.
  • a hot-Water heating system including a coil 11, 12 which defines a closed path fora supply of water, a circulating pump 14, a heat exchanger 15 having -fins 15a surrounding a length of the coil, a gas burner 16 which is located beneath and heats the fins 15a, ⁇ and heat dissipating elements in the form of radiators 10,v only one such radiator being actually shown in the drawing.
  • the radiator 10 is installed downstream of the heat exchanger but upstream of the pump 14.
  • the flow of fuel to the burner 16 is controlled by a safety device 19 which is responsive to a pressure differential between the interior of the clod-water (return) section 12 and the hot-water section 11 of the coil.
  • the return section 12 communicates with an expansion line 13 leading to an expansion tank 13a.
  • the flow of fuel to the burner 16 is controlled by a normally closed regulating valve 17 which is mounted in a supply conduit 18.
  • This regulating valve 17 is a gas valve of known design and is operated by the safety device 19 which comprises a casing accommodating an actuating element here shown as a deformable diaphragm 20 so as to divide its interior into ⁇ chambers 21, 22.
  • the diaphragm 20 is connected with and serves as a means for moving the valve member 17a of the valve 17 away from its seat 17b.
  • the valve member 17a is biased by a spring 17C.
  • the chamber 21 is connected with the return section 12 by a high-pressure pipe 23 which communicates with the section 12 at the downstream side of the pump 14, and the chamber 22 is connected with a low-pressure pipe 24 leading to the hot-water section 11.
  • the chamber 21 is the high-pressure chamber and the chamber 22 is the low-pressure chamber.
  • the heat exchanger 15 offers a certain resistance to the flow of water through the coil so that pressure prevailing in the chamber 21 exceeds th-e pressure in the chamber 22.
  • the pressure differential causes the diaphragm 20 to move ⁇ the valve member 17a away from the seat 17b and to admit gaseous fuel from the supply conduit 18 into the burner 16.
  • Such fuel is ignited by an automatic igniter device -of any known design, not shown in the drawings.
  • the rate at which Water may circulate through the coil is controlled by a throttling device 25 which is installed in the hotwater section close to and upstream of the point where this section communicates with the low-pressure pipe 24.
  • the throttling device 25 is operative when the valve 17 admits fuel to the burner 16 and when the water temperature in the coil is below a predetermined value.
  • the device 25 lthen insures that the flow of water through the hot-water section 11 is throttled whereby the burner 16 heats a small quantity of water per unit of time.
  • the throttling action of the device 25 is proportional to the temperature of water and decreases in response to rising water temperature.
  • the throttling device 25 When the entire supply of water in the coil 11, 12 is heated to a predetermined temperature, the throttling device 25 is fully opened and allows for maximum (normal) circulation of water.
  • the throttling device 25 comprises a thermostat valve which regulates the cross-sectional area of the passage in the hot-Water section 11. ⁇ -It will be noted that Ithe device 25 is installed upstream of the point Where the chamber 22 communicates with the section 11 of the coil and upstream of the point where the chamber 22 communicates with the pipe 24.
  • FIGS. 2 to 4 illustrate the construction of throttling device 25.
  • This device comprises a housing 30 including two open-ended tubular portions 31, 32.
  • the open lower end of the upper portion 31 is connected to the open upper end of the lower portion 32 by a joint 33 which is llocated in a horizontal plane and supports a thermostat valve 34.
  • the valve 34 comprises an annular valve member 36 which is biased by a resilient element here shown as a helical spring 35.
  • the periphery of the valve member 36 is adjacent to an annular valve seat 38 having an annular flange 37 which is clamped between the tubular portions 31, 32.
  • valve member 36 and the seat 38 define between themselves an annular gap 39 which allows a minimum quantity of water to flow from the heat exchanger 15 to the radiator 10.
  • the fiange 37 is conneet-ed with a lower carrier or yoke 40 and with an upper carrier or yoke 41.
  • These yokes partially enclose the valve member 36 and the yoke 40 carries an upwardly extending projection or pin 42 secured thereto by a nut 42a.
  • the pin 42 is slidable in an aperture provided in the bottom wall of a jacket here shown as a cylinder 43, and this cylinder is formed with a circumferential shoulder 44 ⁇ for Ithe valve member 36.
  • the upper end portion of the cylinder 43 extends through 4and beyond an aperture provided in the median portion of the yoke 41, and the internal space of the cylinder accommodates an annular sealing member 45 which is adjacent to the apertured bottom wall and forms a fluid-tight seal around the pin 42.
  • the upper por-tion of the internal space in the cylinder 43 is filled with a material 46 which expands in response to a rise in temperature Iof the cylinder such as is brought about by changes in the temperature of water which flows in the hot-water section 11.
  • the upper leg 11a of this hot-water section is connected to the cylindrical wall of the upper tubular portion 31 and the lower leg of the section 11 comprises a nipple 11b which i-s secured to the bottom wall ⁇ of the lower tubular portion 32 so that water flowing through and beyond the heat exchanger 15 may enter the upper portion 31 to flow around the cylinder 43, through the gap 39, through the lower portion 32 and into the nipple 11b.
  • the material 46 has a predetermined coefficient of expansion and allows the valve member 36 to remain in the lower end position of FIG. 4 when the Water tempera-ture in the section 11 reaches or descends below a predetermined minimum value.
  • the valve member,36 is then held in such lower end position by the spring 35 which forces the pin 42 to penetrate into the material 46 by operating between the upper yoke 41 and the valve member, i.e., between the yoke 41 and the shoulder 44 of the cylinder 43.
  • the latter is slidable in the centrally located aperture of the yoke 41.
  • the material 46 expands gradually and expels a portion of the pin 42 from the internal space Iof the cylinder 43 whereby the cylinder begins to move upwardly, as viewed in FIG. 4, and the cross-sectional area of the gap 39 between the valve member 36 and valve seat 38 increases proportionally so that the water may circulate at a higher rate.
  • the expansion coefficient of the material 46 is such that Ithe bias of the spring 35 is overcome only at the time the temperature of water flowing in the section 11 rises above a predetermined minimum value. Also, in the initial stage of expansion of the material 46, the cross-sectional area of the gap 39 preferably remains unchanged or increases very little (see FIG.
  • the 4throttling device 25 allows for circulation of a smaller quantity of water when the water temperature is below a preselected value whereby the water filling that length of the coil which is surrounded by the Iins a of the heat exchanger 15 remains in longerlasting heat-exchanging contact with the tins 15a and is rapidly heated to a temperature at which the device responds to allow for increased circulation of water through the coil.
  • the thermostat valve 34 causes the throttling device 25 to open fully at the time the water temperature reaches or rises above a predetermined maximum value.
  • valve member 36 will be biased to the position of FIG. 6 whenever they flow of gaseous fuel to the burner 16 is shut off and whenever the water temperature drops below a predetermined minimum value so that the abovedescribed operation begins as soon ⁇ as -the valve 17 admit-s fuel t-o the burner 16 4and the latter begins to heat the ns 15a.
  • FIG. 5 illustrates a somewhat modified ⁇ hot-water heating system wherein the high-pressure chamber 21 of the control device 19 is connected to a high-pressure pipe 223 leading to the hot-water section 11 at a point upstream of the throttling device 25.
  • the low-pressure pipe 24 communicates with the throat portion of ⁇ a Venturi 26 which is provided in the sec-tion 11 downstream of the throttling device 25, i.e., the inlet of the Venturi receives water which has passed through the gap 39 of the thermos-tat valve 34 in the housing 30 of the device 25.
  • the Venturi 26 produces the pressure differential which is necessary to keep the gas valve 17 in open position.
  • the throttling device is again located upstream of the point where the chamber 22 communicates with -the pipe 24.
  • FIG. 6 illustrates a third hot-water heating system which differentiates from the systems of FIGS. 4 and 5 in that the lhigh-pressure pipe 323 connects the chamber 21 with the section 11 at a point downstream of the point where the pipe 24 communicates with this section 11.
  • the pres-l sure differential necessary to operate the control device 19 is produced mainly by a Venturi 326 which is provided in the section 11 and whose throat portion communicates with the intake end of the pipe 24.
  • a modified throttling device 27 is located upstream of the Venturi 326 and cooperates therewith to regulate'the flow of water through the section 11.
  • This throttlingdevice 27 comprises a thermostat which controls the axial position of a needle-shaped valve member 27a extending into and eyond the inlet of the Venturi 326. Changes in axial position of the valve member 27a will bring about changes in the cross-sectional area of the annular orifice in the Venturi 326 so that the rate of water How may be regulated in .a manner analog-ous to that described in connection with FIGS. l to 4.
  • the thermostat which regulates the axial position of the valve member 27a comprises Va sensing element 27b which is in contact with water owing toward the Venturi 326.
  • FIGS. 5 and 6 corresponds exactly to that of the system shown in FIG. 1.
  • FIGS. l, 5 and 6 show that, when the hot-water heating system comprises a safety device 19, the throttling device 25 or 27 is preferably positioned in that section of the coil in which the pressure differential exists, i.e., in the hot-water section 11, whereby the throttling device may be installed upstream of the low-pressure pipe 24 but downstream of the high-pressure pipe 23 or 223 (FIGS. l and 5) or upstream of the pipes 24, 323 (FIG. 6).
  • the pressure differential is produced solely by the Vresistance to water flow which is offered by the heat exchanger 15.
  • FIG. 5 such pressure differential is produced mainly by the Venturi 26, and in FIG.
  • the throttling device 25 or 27 insures that the resistance to ow is rather high when the water temperature is low whereby the gas valve 17 may open in response to low water pressure and remains open when the resistance which the throttling device olfers to ow of water decreases at elevated temperatures.
  • the throttling device is reliable in operation and requires little attention. Also, by effecting certain minor adjustments ad system utilizing our improved throttling device may be used with advantage in heating systems which operate with boiling water.
  • the material 46r used in the cylinder 43 of the throttling device 25 may be a wax like product.
  • a coil defining an endless path for a supply of water; pump means for circulating the water in said coil; .a burner arranged to heat the water in said coil; a conduit for suppling fuel to said burner; a normally closed regulating valve provided in said conduit; means for producing a pressu-re differential in two spaced portions of said coil when the water is circulated by said pum-p means; a safety device comprising a pair of water-filled chambers each communicating with one of said spaced portions of the coil so that the water pressure in one of said chambers exceeds the water pressure in the other chamber, and actuating means operatively connected with and arranged to open said regulating valve in response to such pressure differential in said chambers; and a throttling device comprising a thermostat Valve mounted in said coil upstream ofthe point where said other chamber communicates with the corresponding portion of said coil and arranged to throttle the ow of water at least when the water temperature in said coil is below a predetermined value.
  • a coil defining an endless path for a supply of water; pump means for circulating the water in said coil; a burner arranged to heat the water -in said coil; a conduit for supplying fuel to said burner; a normally closed regulating valve provided in said conduit; means for producing a pressure ⁇ differential in two spaced portions of said coil when the water is circulated by said pump means; a safety de-vice comprising a pair of water-filled chambers eac-h communicating with one of said spaced portions of the coil so that the water pressure in one of said chambers exceeds the water pressure in the other chamber, and actuating means operatively connected with and arranged to open said regulating valve in response to such pressure differential in said chambers; and a throttling device comprising a thermostat valve mounted in said coil between said spaced portions thereof and arranged to throttle the ow of water at least lwhen the für temperature in said coil is below a predetermined va ue.
  • a coil defining an endless path for a supply of water; pump means for circulating the water in said coil; a burner arranged to heat the water in said coil; a conduit for supp-lying fuel to said burner; a normally closed regulating valve provided in said conduit; means including a Venturi for producing a pressure differential in two spaced portions of said coil when the water is circulated by said pump means whereby .the portion containing water whose pressure is higher is located upstream of said Venturi; a safety device comprising a pair of water-filled chambers each communicating with one of said spaced portions of the coil so that the water pressure in that one of said chambers which is connected with the portion located upstream of said Venturi exceeds the water pressure in the other chamber, and actuating means operatively connected with and arranged to open said regulating valve in response to such pressure differential in said chambers; and a throttling device comprising a thermostat valve mounted in .said coil upstream of said Venturi and downstream
  • Venturi comprises a throat portion and wherein said other chamber communicates with said throat portion.
  • a coil defining an endless path for a supply of water; pump means for circulating the water in said coil; a burner arranged to heat the water .in said coil; a conduit for supplying fuel to said burner; a normally closed regulating valve provided in said conduit; means including a Venturi for producing la pressure differential in two spaced portions of said coil when the water is circulated by said pump means whereby the portion lcontaining water whose pressure is higher is located downstream of the other portion and downstream of said Venturi; a safety device comprising a pair of water-filled chambers each communicating with one of said spaced portionsof'the coil whereby the water pressure in that one of said chambers which is connected with the portion containing water whose pressure is higher exceeds the Water pressure in the other chamber, and actuating means operatively connected with and arranged to open said regul-ating valve in response to such pressure differential in said chambers; and a throttling device comprising a thermostat valve mounted in said coil upstream of said Venturi, said
  • valve member is a needle which extends through the inlet of said Venturi.
  • Venturi comprises a .throat portion and the ⁇ other chamber communicates with said throat portion.
  • a coil defining an endless path yfor a supply of water; pump means yfor circulating the water in said coil; a burner arranged to heat the water in said coil; a conduit for supplying fuel to said burner; a normally closed regulating valve provided in said conduit; means for producing a pressure differential in two spaced portions of said coil when the water is circulated by said pump means; a safety device comprising a pair of water-filled chambers each communicating with one of said spaced portions of the coil so that the water pressure in one of said chambers exceeds the water pressure in the other chamber, and actuating means operatively connected with and lar-ranged to open said regulating valve in response to such pressure differential in said chambers; and a throttling device comprising a housing having two tubular housing portions connected in said coil upstream of the point where said other chamber communicates with the corresponding portion of said coil so that the circulating water flows through said housing portions, said housing portions having open ends adjacent to each other, a joint sealing
  • thermostat valve yfu-rther comprises resilient mean-s for biasing said valve member to a position in which the cross-sectional area of said gap is reduced -to a minimum when the water temperature drops to said predetermined value.
  • a coil defining an endless path for a supply of water; pump means for circulating the water in said coil; a heat exchanger having fins exposed to a humidity containing atmosphere, said tins surrounding a length of the coil downstream of .said pump means; a burner arranged to heat said ns whereby the heat exchanger 'heats the water in said coil Iand said iins exhibit a tendency to collect conde-nsate from the surrounding -humidity containing atmosphere -when the water temperature in said length of coil is below a predetermined value; heat-dissipating means provided in said coil downstream of said heat exchanger but upstream of said pump means; a throttling v-alve for regulating the rate of water flow through said coil, said throttling valve provided in said coil adjacent to and downstream of said heat exchanger but upstream of said heat dissipating means; and thermostatic actuating means dependent upon the water temperature in the region of said
  • a coil dening an endless path ⁇ for a supply of water; pump means for circulating the water in said coil; a heat exchanger having ns surrounding a length of the coil downstream of said pump means; a burner arranged to heat said tins whereby the heat exchanger heats the water in said coil and said Ifins exhibit a tendency to collect condensate from the surrounding air [when the water temperature in said coil is below a predetermined value; heat-dissipating means provided in said coil downstream of said heat exchanger Ibut upstream ot said pump means; and a throttling device yfor regulating the lrate of water flow through said coil, said throttling device comprising a thermostat valve provided in said coil downstream of said heat exchanger but upstream of said heat-dissipating means and arranged to reduce the rate of uid flow, at least when the water temperature is below said predetermined value, so that the water temperature in said length of coil rapidly rises above said
  • a coil dening an endless path for a supply of fluid, a heat exchanger and at least one heat dissipating element provided in said coil; burner means arranged to heat said heat exchanger whereby the latter heats the fluid; means for circulating the uid in said coil; conduit means connected with Iand arranged to supply fuel to said burner means; a normally closed regulating valve provided in said conduit means; a safety device for opening said regulating valve in response to a pressure differential in two spaced portions of said coil; :and an adjustable throttling device Afor regulating the rate at which the fluid may circulate in said coil, said throttling device comprising a thermostat valve mounted in said coil and arranged to throttle the flow of duid at least when the huid temperature in said coil remains below a predetermined value.
  • a struct-ure as set forth in claim ⁇ 16 wherein said heat exchanger comprises at least one package of flins dening between themselves spaces which collect condensate from the surrounding air when the temperature of ⁇ fluid in said coil drops to said predetermined value, said throttling device being arranged to prevent such accumulations of condensate in said spaces by throttling the ow of huid sutiiciently to insure tha-t huid contained in said heat exchanger is rapidly heated to above said predetermined temperature.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Thermal Sciences (AREA)
  • Cookers (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
US386625A 1963-08-01 1964-07-31 Hot-water heating system Expired - Lifetime US3258203A (en)

Applications Claiming Priority (1)

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DEJ0024173 1963-08-01

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US3258203A true US3258203A (en) 1966-06-28

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US (1) US3258203A (de)
BE (1) BE651305A (de)
CH (1) CH425139A (de)
GB (1) GB1080553A (de)
NL (1) NL6408794A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334812A (en) * 1965-12-30 1967-08-08 Gen Motors Corp Quick response thermostatic valve
US4346835A (en) * 1981-04-08 1982-08-31 Albin Trotter Instantaneous water heater gas control valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2281257B1 (es) * 2005-08-26 2008-08-16 Guard Sound Industry Co., Ltd. Dispositivo y metodo para mantener la temperatura constante en un calentador de agua.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1061635A (en) * 1912-04-17 1913-05-13 Oscar A Ross Heating system.
US2194805A (en) * 1939-05-15 1940-03-26 Robert E Moore Heating system
US2340844A (en) * 1943-03-27 1944-02-01 Detroit Lubricator Co Heating apparatus
FR1201596A (fr) * 1958-07-03 1960-01-04 Chaffoteaux Et Maury Perfectionnements apportés aux installations de chauffage central
US2981477A (en) * 1958-10-06 1961-04-25 Flexonics Corp Thermostat valve
US3201045A (en) * 1962-03-19 1965-08-17 C D Patents Ltd Combined space heating and domestic hot water heating system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1061635A (en) * 1912-04-17 1913-05-13 Oscar A Ross Heating system.
US2194805A (en) * 1939-05-15 1940-03-26 Robert E Moore Heating system
US2340844A (en) * 1943-03-27 1944-02-01 Detroit Lubricator Co Heating apparatus
FR1201596A (fr) * 1958-07-03 1960-01-04 Chaffoteaux Et Maury Perfectionnements apportés aux installations de chauffage central
US2981477A (en) * 1958-10-06 1961-04-25 Flexonics Corp Thermostat valve
US3201045A (en) * 1962-03-19 1965-08-17 C D Patents Ltd Combined space heating and domestic hot water heating system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334812A (en) * 1965-12-30 1967-08-08 Gen Motors Corp Quick response thermostatic valve
US4346835A (en) * 1981-04-08 1982-08-31 Albin Trotter Instantaneous water heater gas control valve

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NL6408794A (de) 1965-02-02
GB1080553A (en) 1967-08-23
BE651305A (de) 1964-11-16
CH425139A (de) 1966-11-30

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