US3917162A - Diaphragm valve for controlling supply of gas to water heater - Google Patents

Diaphragm valve for controlling supply of gas to water heater Download PDF

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Publication number
US3917162A
US3917162A US52621174A US3917162A US 3917162 A US3917162 A US 3917162A US 52621174 A US52621174 A US 52621174A US 3917162 A US3917162 A US 3917162A
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United States
Prior art keywords
valve
gas
chamber
flow
water
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Expired - Lifetime
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English (en)
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Albin Trotter
Ursus Trotter
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Individual
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Individual
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Filing date
Publication date
Priority to US52621174 priority Critical patent/US3917162A/en
Application filed by Individual filed Critical Individual
Priority to AR25754375A priority patent/AR204264A1/es
Priority to GB4780375A priority patent/GB1477110A/en
Publication of US3917162A publication Critical patent/US3917162A/en
Application granted granted Critical
Priority to CH1448075A priority patent/CH590434A5/xx
Priority to ES442705A priority patent/ES442705A1/es
Priority to BR7507618A priority patent/BR7507618A/pt
Priority to DE19752552226 priority patent/DE2552226A1/de
Priority to DE19757536999U priority patent/DE7536999U/de
Priority to FR7535839A priority patent/FR2292170A1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F23N1/085—Regulating fuel supply conjointly with another medium, e.g. boiler water using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters
    • F23Q9/08—Pilot flame igniters with interlock with main fuel supply
    • F23Q9/12—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame
    • F23Q9/14—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame using electric means, e.g. by light-sensitive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2703—Flow rate responsive

Definitions

  • ABSTRACT PP 526,211 Valve for controlling flow of gas to water heater comprises two chambers separated by a diaphragm.
  • a first chamber has a gas inlet and a gas outlet leading to the 81. 23622192,B1;Z8M7) burner of the heater.
  • the outlet is controlled y the [58] Field sE E 137/87 diaphragm position which is in turn dependent on the ii relative pressure in the chambers.
  • a by-pass connects the two chambers, and the diaphragm position is [56] References Cited therefore dependent on the exhaust from the second UNITED STATES PATENTS chamber, which is controlled in response to the flow 1,878,270 9/1932 Eberspacher 236/25 of wat r to the heater and the temperature of the wa- 2,009,193 7/1935 Hegwein et al.... 236/25 ten 2,848,167 8/1958 Matthews 236/23 X 3,118,600 l/1964 Miller 236/23 8 Claims, 1 Drawing Figure US. Patent Nov. 4, 1975 3,917,162
  • the object ofthe present invention is to improve the magnetic-mechanical valves or devices employed for the control of the gas flow in instantaneous water heaters, as disclosed in US. Pat. No. 3,806,026, dated Apr. 23, 1974.
  • the devices disclosed in said patent represented a substantial 'improvementand novelty in the field of the gas flow control devices for water heaters because by the use of a novel magnetic device comprising a hollow magnetic piston and a set of permanent magnets mounted on the arms of a tilting lever, the invention provided for both the progressive lighting of the water heater burner and the instantaneous cut-off of said burner in the event no water is flowing.
  • a novel thermostatic device provided a constant modulationof the burner flame, at the users option, as a function of the water flow, preventing the over-heating of the heat-exchanger coil, and eliminating all the problems usually encountered in conventional water heaters.
  • the improved valve according to the invention is provided with a failsafe system, using a thermocouple (which is not in itself the object of this invention) which in turn controls a magnetic coil that prevents the lighting of the main burner in the event the pilot-flame"is not lighted.
  • a hollow metal body 1 connected at its two ends to the inlet and outlet ducts 2 and 3 through which the water to be heated in the heat-exchanger coil 4 of the instantaneous water heater circulates.
  • stop rings 5 and 6 limiting the axial movemen t' of the hollow piston 7, which is formed by a permanent magnet.
  • the magnetic hollow piston 7 moves upwardly or downwardly inside the body 1 in dependence on the flow of water through the ducts 2 and 3.
  • the magnetic piston 7 will move upwardly until it abuts against the stop ring 6, and, conversely, the piston 7 will move downwardly when the flow decreases until it is seated on the bottom ring 5 when the flow stops.
  • the broken lines show the piston 7 at its bottom position when there is no flow in duct 2, and the solid lines show said piston in its upper position when the water is flowing.
  • a second, short, hollow metal body 8 projects from the center part of the hollow metal body 1, at a right angle relative to the geometrical axis of the body 1.
  • the body 8 has inlet and outlet nozzles 9 and 10 respectively for discharging the gas flow from the diaphragm valve.
  • a solid magnetic piston 11 Inside the hollow body 8 is a solid magnetic piston 11 having its North pole facing the North pole of the magnetic piston 7, across the wall of the body 1 when the piston 7 is at its bottom position.
  • the other end of the piston 11 (i.e., its South pole) is provided with an elastic disc 12 made of rubber, neoprene or the like, the position of which permits or prevents the flow of the gas through the nozzles 9 and 10.
  • the nozzle 10 projects into the body 8 forming a seat 13 for the resilient disc 12 and providing a gas-tight seal when the magnetic piston 11 is remote from the magnetic hollow piston 7 due to the magnetic repulsion produced when the North poles of both magnets 7 and 11 are facing each other.
  • This assembly which is controlled by the fluctuations in the stream of water flowing through the instantaneous water heater, which fluctuations are produced by the user or being caused by variations in flow in the water mains, controls a diaphragm type gas valve 14, which in turn controls the gas feed to the burner 15.
  • the diaphragm valve 14 comprises an upper chamber 16 and a lower chamber 17, separated by a diaphragm 18 made of a resilient material, said diaphragm having in its center a closure disc 19 made of metallic or resilient material.
  • the gas inlet 20 opens into the upper chamber 16 which has in one wall the seat 21 for the closure disc 19 of the diaphragm 18.
  • a closure valve 22 biased closed by a spring but held open by a solenoid 23 activated by a thermoelectric device 24 responsive to the pilot flame 25 when that flame is lit.
  • the upper part of the valve body 14 is located the conical gas valve 26 defining a duct or orifice 27 leading to the pilot flame 25.
  • the stem and body of the conical valve 26 are axially perforated to accommodate a pin 28 ending in a knob 29.
  • the pin 28 is biassed by the helical spring 30 away from the closure valve 22 which, when seated on seat 22a, interrupts the gas flow.
  • To initially permit the flow of gas to the pilot 25 it is necessary to press the knob 29 inward, and this can be done only when the conical valve 26 is closed, because of the half 29a of said knob which must be introduced in a corresponding slot in the knob 29b of the conical valve 26.
  • a novel ignition retarding valve comprising a box 31 having orifices 32 in its upper part. Inside the box 31 is a small disc 33, made of metal or other material, having at least one small orifice 34 therein.
  • the lower chamber 17 and the upper chamber 16 of the diaphragm valve are connected by a duct 35 connected to a duct 36 which in turn connects the ignition retarding valve 31 with the perforated pin 37 of the temperature regulator 38 located in the lower part of the valve 14.
  • the temperature regulator 38a comprises a threaded portion 39 adapted to be rotated by the knob 38 to permit the forward or backward movement of the perforated pin 37 relative to the conical end 40 of the thermostat 41 which is connected to the capillary tube 42 connected to a bulb 43 suitably immersed in the heatexchanger coil 4 of the instantaneous water heater in order to sense the water temperature.
  • the duct 36 in the lower body 17 of the diaphragm valve leads to a duct 44 which receives a regulating screw 45 to regulate the minimum flame.
  • the duct 44 is connected to the outlet nozzle 46 which is also connected to the chamber 47 containing the conical end 40 of the thermostat and the end of the perforated body 37 of the temperature regulator.
  • the outlet nozzle 46 is connected to the nozzle 9 of the hollow body 8 through a duct 48 having a small diameter, and the outlet nozzle 10 of the body 8 is connected to the conical valve 26 through a tube 49 likewise having a small diameter.
  • control valve assembly in operation, operates as follows:
  • valve 22 When the valve 22 is opened, by depressing the knob 29 to ignite the pilot, the combustible gas enters the diaphragm valve 14 through the gas inlet 20, thus filling the upper chamber 16, and flows through the duct 35 to duct 36 and thence through the ignition retarding valve 31 to fill the lower chamber 17.
  • the hollow magnetic piston 7 moves from its bottom position 5 to its upper position 6, and the South pole of the magnetic piston 7 faces the North pole of the magnet 11 located in the hollow metal body 8, thus producing a magnetic attraction and withdraws the closure disc 12 (attached to the South pole of said magnet 11) from its seat 13 permitting communication between the gas nozzles 9 and and permitting the exhaust of the gas accumulated in the lower chamber17 of the diaphragm valve 14, which gas flows through the ducts 48 and 49 to the main heater of the burner 15, if and when the conical valve 26 is in its open position.
  • the movement of the magnetic piston 11, in dependence on the water flow variations controls the passage of the gas between the nozzles 9 and 10 thus controlling the passage of gas to the burner 15, because when the flow of gas from the lower chamber through the duct 48 is interrupted, the gas pressure will be equalized inside both chambers 16 and 17, forcing the rapid movement of the diaphragm to close the inlet 21 and interrupting the gas flow to the burner 15.
  • the sensor bulb 43 senses the water temperature in a suitable part of the coil 4 and the consequent increase or decrease in the volume of the liquid or gaseous medium inside the bulb 43 and capillary tube 42 controls the movement of the conical end 40 of the thermostatic bellows 41, which is attached to the bottom part of the diaphragm valve.
  • This conical end 40 movesforward or backward relative to the perforated pin 37 that forms part of the temperature setting knob 38, which is suitably graduated for the convenience of the user.
  • the water temperature reduction is sensed by the bulb 43 and the respective reaction of the thermostatic means is to retract the conical end 40 removing said end from the perforated pin 37, allowing a larger flow of gas through the chamber 47 and reducing the .pressure in the bottom chamber 17, thus allowing the opening of the diaphragm, due to pressure in the upper chamber 16, and increasing the gas flow to the burner 15, which in turn causes the water temperature to increase until the high water temperature causes the restriction of the gas flow to the chamber 47 and the reduction of the gas flow to the burner 15.
  • the volume of this small gas flow (which produces a A minimum flame) can be easily regulated by adjusting the setting of the minimum flame screw 45 to decrease or increase the flow of the gas drainage from the upper to the bottom chamber of the diaphragm valve.
  • the improved control device disclosed in this description does not require mechanical linkages to interconnect the component parts of the device, thus eliminating the usual problems encountered in conventional control systems, such as stuck pins, bent levers, rusted pins or levers, damaged seals producing water and/or gas leaks, and so on; because there is no physical connection or communication between the gas and water circuit portions.
  • a diaphragm valve for controlling the flow of gas to a water heater'including a burner and equipped with a magnetic member responsive to variations in the flow of water to said heater, said valve comprising first and second chambers separated by a diaphragm, said first chamber being provided with a gas inlet and an outlet leading to said burner, and said diaphragm being movable between a first position closing said outlet and a second position in which said outlet is left open in dependence on the relative pressure in said chambers, the improvement which comprises duct means connecting said first and second chambers, and providing an exhaust for said second chamber,
  • magnetically actuated valve means responsive to the position of said magnetic member and positioned to control the exhaust of gas from said second chamber through said duct means
  • manually adjustable heat responsive valve means responsive to the temperature in said heater for additionally controlling the exhaust of gas from said second chamber through said duct means.
  • said magnetically actuated valve comprises a magnetic piston movable inside a hollow body and actuated by the variations in the magnetic field between one end of said magnetic piston and the magnetic member responsive to the variations in the water flow, said piston being provided with a resilient disc attached to the end thereof remote from said one end and positioned to cooperate with a seat in said duct means to control the exhaust of gas from said second chamber.
  • valve as claimed in claim 2 in which the resilient disc attached to said magnetic piston controls; a connection between the second chamber of the diaphragm valve and a gas inlet to said burner, said connection being magnetically controlled in response to variations in the flow of water entering the water heater independently of variations in the temperature of the outlet water.
  • said heat responsive valve means comprises a perforated pin in said duct means having in one end a gas outlet facing the conical end of a bellows responsive to the temperature of the water heated by said heater.
  • a valve as claimed in claim 1 which comprises an ignition retarding valve including a disc having at least one small orifice therein alignedwith a larger orifice in said duct means, said disc being enclosed in a housing having at least one orifice leading to said second chamber, said disc being positioned to be lifted by gas flowing into said second chamber to permit rapid charging thereof, but depressed to partially obstruct said larger orifice when gas is being exhausted from said second chamber.
  • a valve as claimed in claim 1 comprising electromagnetic closure means connected to cut off the flow of gas to said burner whenever a pilot light is unlit, and an activator pin capable of opening said closure means only when a main valve controlling gas flow to said burner is in its closed position.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Fluid-Driven Valves (AREA)
US52621174 1974-11-22 1974-11-22 Diaphragm valve for controlling supply of gas to water heater Expired - Lifetime US3917162A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US52621174 US3917162A (en) 1974-11-22 1974-11-22 Diaphragm valve for controlling supply of gas to water heater
AR25754375A AR204264A1 (es) 1974-11-22 1975-01-01 Dispositivo mecanico magnetico para controlar el fluio de un gas en respuesta a variaciones en el flujo de un liquido
GB4780375A GB1477110A (en) 1974-11-22 1975-10-20 Control systems for liquid heaters
CH1448075A CH590434A5 (fr) 1974-11-22 1975-11-10
ES442705A ES442705A1 (es) 1974-11-22 1975-11-17 Valvula mejorada para el control del flujo de gas en un ca- lentador instantaneo de agua.
BR7507618A BR7507618A (pt) 1974-11-22 1975-11-17 Aperfeicoamento em valvula de diafragma para controlar fluxo de gas a aquecedor de agua
DE19752552226 DE2552226A1 (de) 1974-11-22 1975-11-21 Steuer- und regeleinrichtung fuer den betrieb gasbeheizter warmwasser- durchlauferhitzer
DE19757536999U DE7536999U (de) 1974-11-22 1975-11-21 Steuer- und regeleinrichtung fuer den betrieb gasbeheizter warmwasser- durchlauferhitzer
FR7535839A FR2292170A1 (fr) 1974-11-22 1975-11-24 Distributeur a diaphragme destine a commander l'alimentation en gaz d'un chauffe-eau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52621174 US3917162A (en) 1974-11-22 1974-11-22 Diaphragm valve for controlling supply of gas to water heater

Publications (1)

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US3917162A true US3917162A (en) 1975-11-04

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US52621174 Expired - Lifetime US3917162A (en) 1974-11-22 1974-11-22 Diaphragm valve for controlling supply of gas to water heater

Country Status (8)

Country Link
US (1) US3917162A (fr)
AR (1) AR204264A1 (fr)
BR (1) BR7507618A (fr)
CH (1) CH590434A5 (fr)
DE (2) DE2552226A1 (fr)
ES (1) ES442705A1 (fr)
FR (1) FR2292170A1 (fr)
GB (1) GB1477110A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184457A (en) * 1978-03-27 1980-01-22 Albin Trotter Water flow responsive control for a liquid heater
US4431019A (en) * 1981-06-25 1984-02-14 Baxter Travenol Laboratories, Inc. Fluid flow control device
US4746436A (en) * 1981-06-25 1988-05-24 Baxter Travenol Laboratories, Inc. Membrane plasmapheresis apparatus and process which utilize a flexible wall to variably restrict the flow of plasma filtrate and thereby stabilize transmembrane pressure
US5322216A (en) * 1992-07-17 1994-06-21 Leslie M. Sandler System and method for controlling outlet water temperature of an instantaneous water heater
US7377495B1 (en) * 2004-03-03 2008-05-27 Thompson Design Innovation, L.L.C. Temperature sensitive pressure regulator for carbonated beverage systems
US20120060951A1 (en) * 2010-09-07 2012-03-15 Wolter Gerry C Gas modulation and temperature control valve
US20160018826A1 (en) * 2014-07-18 2016-01-21 Instrument Solutions Inc. System, method, and apparatus for regulating the flow of gas
CN111578274A (zh) * 2020-05-18 2020-08-25 珠海格力电器股份有限公司 燃烧器、燃烧器装置及热水器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708445C3 (de) * 1977-02-26 1979-11-29 Honeywell B.V., Amsterdam Gasbefeuerter Warmwasserbereiter
JPS57501688A (fr) * 1980-03-26 1982-09-16
GB2130693A (en) * 1982-09-18 1984-06-06 Plas Tec Products Limited Water heater
FR2565675B1 (fr) * 1984-06-07 1988-09-09 Vaillant Sarl Dispositif de commande et de reglage pour un chauffe-eau a gaz.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878270A (en) * 1930-07-22 1932-09-20 Eberspacher Otto Automatic control valve
US2009193A (en) * 1932-08-01 1935-07-23 Junkers & Co Gas switch
US2848167A (en) * 1953-03-26 1958-08-19 Baso Inc Condition responsive control apparatus
US3118600A (en) * 1961-08-28 1964-01-21 Avy L Miller Continuous flow fluid heater control
US3426971A (en) * 1965-11-22 1969-02-11 Vaillant Joh Kg Arrangement in a hot-water circulation heating with domestic water heater

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1523792A (fr) * 1967-05-22 1968-05-03 Radiation Ltd Perfectionnements aux soupapes régulatrices de débit d'un ou plusieurs fluides

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878270A (en) * 1930-07-22 1932-09-20 Eberspacher Otto Automatic control valve
US2009193A (en) * 1932-08-01 1935-07-23 Junkers & Co Gas switch
US2848167A (en) * 1953-03-26 1958-08-19 Baso Inc Condition responsive control apparatus
US3118600A (en) * 1961-08-28 1964-01-21 Avy L Miller Continuous flow fluid heater control
US3426971A (en) * 1965-11-22 1969-02-11 Vaillant Joh Kg Arrangement in a hot-water circulation heating with domestic water heater

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184457A (en) * 1978-03-27 1980-01-22 Albin Trotter Water flow responsive control for a liquid heater
US4431019A (en) * 1981-06-25 1984-02-14 Baxter Travenol Laboratories, Inc. Fluid flow control device
US4746436A (en) * 1981-06-25 1988-05-24 Baxter Travenol Laboratories, Inc. Membrane plasmapheresis apparatus and process which utilize a flexible wall to variably restrict the flow of plasma filtrate and thereby stabilize transmembrane pressure
US5322216A (en) * 1992-07-17 1994-06-21 Leslie M. Sandler System and method for controlling outlet water temperature of an instantaneous water heater
US7377495B1 (en) * 2004-03-03 2008-05-27 Thompson Design Innovation, L.L.C. Temperature sensitive pressure regulator for carbonated beverage systems
US9010368B2 (en) * 2010-09-07 2015-04-21 Precision Temp, Inc. Gas modulation and temperature control valve
US20120060951A1 (en) * 2010-09-07 2012-03-15 Wolter Gerry C Gas modulation and temperature control valve
US20160018826A1 (en) * 2014-07-18 2016-01-21 Instrument Solutions Inc. System, method, and apparatus for regulating the flow of gas
US9714740B2 (en) * 2014-07-18 2017-07-25 Instrument Solutions Inc. System, method, and apparatus for regulating the flow of gas
US20170284604A1 (en) * 2014-07-18 2017-10-05 Instrument Solutions Inc. System, method, and apparatus for regulating the flow of gas
US10508774B2 (en) * 2014-07-18 2019-12-17 Dean Leonidas Koulogianes System, method, and apparatus for regulating the flow of gas
US11204135B2 (en) 2014-07-18 2021-12-21 Devtech Sales, Inc. System, method, and apparatus for regulating the flow of gas
CN111578274A (zh) * 2020-05-18 2020-08-25 珠海格力电器股份有限公司 燃烧器、燃烧器装置及热水器

Also Published As

Publication number Publication date
ES442705A1 (es) 1977-08-01
BR7507618A (pt) 1976-08-10
FR2292170B1 (fr) 1979-04-06
GB1477110A (en) 1977-06-22
FR2292170A1 (fr) 1976-06-18
DE7536999U (de) 1978-12-14
DE2552226A1 (de) 1976-07-22
CH590434A5 (fr) 1977-08-15
AR204264A1 (es) 1975-12-10

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