WO2008015304A2 - Retention valve - Google Patents

Retention valve Download PDF

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Publication number
WO2008015304A2
WO2008015304A2 PCT/ES2007/000439 ES2007000439W WO2008015304A2 WO 2008015304 A2 WO2008015304 A2 WO 2008015304A2 ES 2007000439 W ES2007000439 W ES 2007000439W WO 2008015304 A2 WO2008015304 A2 WO 2008015304A2
Authority
WO
WIPO (PCT)
Prior art keywords
mouth
bushing
obturator
towards
valve
Prior art date
Application number
PCT/ES2007/000439
Other languages
Spanish (es)
French (fr)
Other versions
WO2008015304A3 (en
Inventor
Lluis Monterde Fabregat
Original Assignee
Genebre, S.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Genebre, S.A. filed Critical Genebre, S.A.
Publication of WO2008015304A2 publication Critical patent/WO2008015304A2/en
Publication of WO2008015304A3 publication Critical patent/WO2008015304A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring

Definitions

  • the present invention relates, as indicated in its statement, to a check valve.
  • This valve is of the type that comprises a tubular body in whose interior an obturator elastically requested to its closing position is mounted axially movable and which, when installed in the corresponding fluid conduit, retains it until a certain pressure in which it opens and Let him go through it.
  • the shutter subsequently presents, as the second mentioned background, a single axis that is also passing through a single tubular guide bushing that is removably coupled, through radial arms, in the mouth of the tubular body through which the fluid flows, but presenting this bushing, towards the mouth of said body through which the fluid enters, a prolongation thereof, which not only compensates for the suppression of the other axis but, when starting now the indicated arms of the intermediate zone of the bushing / extension assembly, ensures the stability of said assembly and, consequently, the perfect guidance of the shutter, delimiting also the extension of the bushing the path of said shutter towards its opening position.
  • valve and guide free valve are in the fluid inlet, the intake surface of the fluid increases and, therefore, if you want to maintain the same fluid flow as in the valves with two axes and two guides,
  • the size of the valve can be reduced, thereby reducing its cost.
  • the internal barrel-like geometry of the interior of the tubular body and the discoidal configuration, with a central protrusion on its front face, of the obturator increase the fluid-dynamic capacity of the valve, allowing greater fluidity to the passage of the fluid, and decreasing the turbulence that may appear inside.
  • the arms of the tubular bush are coupled to the mouth where the fluid exits through a ring to whose inner surface said arms are joined by the opposite end to which they are attached to the indicated bushing, and whose outer surface is threaded for threaded coupling in the indicated mouth, also threaded, of the tubular body, thus facilitating the assembly and disassembly of the bushing / arms / ring assembly in case of possible repair and / or replacement of any valve element.
  • This assembly and disassembly of the bushing / arms / ring assembly allows, in turn, to regulate the opening pressure of the valve, adapting it to the needs of the user, being able to loosen such a thread, and up to two at most in case if necessary, to obtain a reduction in opening pressure of approximately 20% for each thread loosened.
  • the shutter shaft can have at least one longitudinal recess in its cylindrical surface, which will facilitate the evacuation of impurities from the fluid passing through the valve and that can accumulate between said shaft and the tubular bushing through which it runs, blocking said axis and compromising the functionality of the valve.
  • Figure 1 shows an exploded perspective view of the valve in question
  • Figures 2 and 3 illustrate the same in partial raised sections, and in closed and open arrangement respectively
  • Figures 4 and 5 are planar sections of the shaft of the shutter as it passes through the tubular sleeve and with different recesses in its cylindrical surface.
  • DESCRIPTION OF AN EXAMPLE OF EMBODIMENT According to the drawings, the illustrated check valve consists of a tubular body (1) that can be (as illustrated) of a single piece to prevent external leakage but which can also be of two pieces coupled to each other to manufacture large valves, since the wingspan of the same hinders their machining if they are single-piece.
  • the tubular body (1) has a front inlet (2) of fluid inlet and a rear outlet (3) of the same, both internally threaded and a ring (4) externally threaded to whose inner surface is attached a tubular bushing (6) through radial arms (5) that start from the front part of said bushing diverging inclined backwards until joining the ring (4).
  • a shaft (7) runs along the inside of the tubular bushing (6) which, at the front end, forms a discoidal head that constitutes the valve plug (8), acting against it a spring (9) which, strung on the shaft (7) and with the front end inserted in a lower annular groove (8 ') of said shutter, rests, by the rear end, on the start of the arms (5), the rear end part of said spring remaining.
  • a spring (9) which, strung on the shaft (7) and with the front end inserted in a lower annular groove (8 ') of said shutter, rests, by the rear end, on the start of the arms (5), the rear end part of said spring remaining.
  • the extension (6 ') ensures the perfect guidance of the shaft (7) and, consequently, of the plug (8), which has on its front free face a peripheral and flat annular joint (10) which, joined by vulcanizing to a peripheral annular recess (8 ") of said shutter to prevent its detachment and / or the appearance of foreign particles (usually grit) between said gasket and recess (8"), contact a circular seat (11) formed in the mouth (2) of the body (1) by closing it tightly.
  • the obturator (8) also has, in its free face, a central frustoconical protuberance that deflects towards the sides the fluid that collides with it, favoring its circulation, and the axis (7) can have one or more recesses longitudinally (7 ' ) that will configure different sections of it (such as the approximately square with rounded corners of Figure 4, or the circular cut by two parallel planes of Figure 5) and determine spaces (13) between the axis (7) and the bushing ( 6) by those who will evacuate impurities from the fluid that could block the movement of said axis.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)

Abstract

This valve is of the type that comprises a tubular body (1), inside which an obturator (8) stressed elastically towards its closure position can be displaced axially. Said obturator has a rear pin (7) whereby it is guided via a tubular bush (6) slipped over said pin and coupled removably, via radial arms (5), in the mouth (3) of the body (1) via which the fluid exits. The bush (6) has, towards the mouth (2) of the body (1) via which the fluid enters, an extension (6') that ensures perfect guiding of the obturator (8) in addition to delimiting the travel thereof towards its open position, and the arms (5) are joined, via the end opposite that which joins to the bush (6), to a ring (4) that is threaded on the outside for coupling into the mouth (3), the pin (7) of the obturator (8) having, for its part, at least one longitudinal recess (7') in its cylindrical surface for evacuation of impurities from the valve.

Description

DESCRIPCIÓN DESCRIPTION
Válvula de retención.Retention valve.
OBJETO DE LA INVENCIÓNOBJECT OF THE INVENTION
La presente invención se refiere, tal como indica su enunciado, a una válvula de retención.The present invention relates, as indicated in its statement, to a check valve.
CAMPO DE LA INVENCIÓNFIELD OF THE INVENTION
Esta válvula es del tipo que comprende un cuerpo tubular en cuyo interior está montado axialmente desplazable un obturador solicitado elásticamente a su posición de cierre y que, al instalarse en la correspondiente conducción de fluido, retiene a éste hasta una determinada presión en que se abre y lo deja pasar por ella.This valve is of the type that comprises a tubular body in whose interior an obturator elastically requested to its closing position is mounted axially movable and which, when installed in the corresponding fluid conduit, retains it until a certain pressure in which it opens and Let him go through it.
ANTECEDENTES DE LA INVENCIÓNBACKGROUND OF THE INVENTION
Ya son conocidas diversos modelos de válvulas de retención del indicado tipo, presentando unas, en las dos caras opuestas del obturador, sendos ejes mediante los cuales dicho obturador es guiado por correspondientes guías previstas en las dos bocas del cuerpo de la válvula, y presentando otras un solo eje en una de las caras del obturador con el que éste es guiado por una sola guía prevista en la boca del cuerpo de la válvula por donde sale el fluido.Various models of check valves of the type indicated are already known, presenting two, on the two opposite faces of the plug, two axes by which said plug is guided by corresponding guides provided in the two mouths of the valve body, and presenting others a single axis on one of the faces of the shutter with which it is guided by a single guide provided in the mouth of the valve body through which the fluid flows.
En las primeras se producen normalmente turbulencias y ruidos provocados por el impacto del fluido en la superficie de la guía ubicada en la boca del cuerpo tubular por la que entra el fluido y, en las segundas, aunque prescinden del eje y de la consiguiente guía del mismo correspondientes a dicha boca eliminándose con ello los citados ruidos y turbulencias, el guiado del indicado obturador con un solo eje y una única guía resulta deficiente. SUMARIO DE LA INVENCIÓNIn the former, turbulence and noise are normally caused by the impact of the fluid on the surface of the guide located at the mouth of the tubular body through which the fluid enters and, in the latter, although they dispense with the shaft and the consequent guide of the same corresponding to said mouth eliminating with it the mentioned noises and turbulence, the guidance of the indicated shutter with a single axis and a single guide is poor. SUMMARY OF THE INVENTION
Estos inconvenientes o problemas, y otros que puedan derivarse de ellos, quedan solventados con la válvula de retención objeto de la presente invención, en la que el obturador presenta posteriormente, como los segundos antecedentes citados, un único eje que es pasante, asimismo, por un único casquillo tubular de guía que está acoplado amoviblemente, a través de unos brazos radiales, en la boca del cuerpo tubular por la que sale el fluido, pero presentando este casquillo, hacia la boca de dicho cuerpo por la que entra el fluido, una prolongación del mismo que, no solo compensa la supresión del otro eje sino que, al arrancar ahora los indicados brazos de la zona intermedia del conjunto casquillo/prolongación, se asegura la estabilidad de dicho conjunto y, consiguientemente, el perfecto guiado del obturador, delimitando asimismo la prolongación del casquillo el recorrido de dicho obturador hacia su posición de apertura. Al estar la válvula libre de guía y de eje en la boca de entrada del fluido, la superficie de admisión del mismo aumenta y, por tanto, si se quiere mantener el mismo paso de fluido que en las válvulas con dos ejes y dos guías, puede disminuirse la envergadura de la válvula, reduciendo de esta manera el coste de la misma. La geometría interna a modo de barril del interior del cuerpo tubular y la configuración discoidal, con una protuberancia central en su cara delantera, del obturador aumentan la capacidad fluido-dinámica de la válvula, permitiendo una mayor fluidez al paso del fluido, y disminuyendo las turbulencias que puedan aparecer en su interior. Ventajosamente, los brazos del casquillo tubular, preferentemente inclinados para favorecer también el paso del fluido, se acoplan a la boca por donde sale el fluido a través de un anillo a cuya superficie interior están unidos dichos brazos por el extremo opuesto al que están unidos al indicado casquillo, y cuya superficie exterior está roscada para su acoplamiento a rosca en la indicada boca, asimismo roscada, del cuerpo tubular, facilitándose así el montaje y desmontaje del conjunto casquillo/brazos/anillo en caso de una posible reparación y/o sustitución de algún elemento de la válvula.These inconveniences or problems, and others that may arise from them, are solved with the check valve object of the present invention, in which the shutter subsequently presents, as the second mentioned background, a single axis that is also passing through a single tubular guide bushing that is removably coupled, through radial arms, in the mouth of the tubular body through which the fluid flows, but presenting this bushing, towards the mouth of said body through which the fluid enters, a prolongation thereof, which not only compensates for the suppression of the other axis but, when starting now the indicated arms of the intermediate zone of the bushing / extension assembly, ensures the stability of said assembly and, consequently, the perfect guidance of the shutter, delimiting also the extension of the bushing the path of said shutter towards its opening position. As the valve and guide free valve are in the fluid inlet, the intake surface of the fluid increases and, therefore, if you want to maintain the same fluid flow as in the valves with two axes and two guides, The size of the valve can be reduced, thereby reducing its cost. The internal barrel-like geometry of the interior of the tubular body and the discoidal configuration, with a central protrusion on its front face, of the obturator increase the fluid-dynamic capacity of the valve, allowing greater fluidity to the passage of the fluid, and decreasing the turbulence that may appear inside. Advantageously, the arms of the tubular bush, preferably inclined to also favor the passage of the fluid, are coupled to the mouth where the fluid exits through a ring to whose inner surface said arms are joined by the opposite end to which they are attached to the indicated bushing, and whose outer surface is threaded for threaded coupling in the indicated mouth, also threaded, of the tubular body, thus facilitating the assembly and disassembly of the bushing / arms / ring assembly in case of possible repair and / or replacement of any valve element.
Este montaje y desmontaje del conjunto casquillo/brazos/anillo permite, a su vez, regular la presión de apertura de la válvula adecuándola a las necesidades del usuario, pudiéndose aflojar dicho conjunto un hilo de rosca, y hasta dos como máximo en caso de que fuera necesario, para obtener una reducción en la presión de apertura de aproximadamente un 20% para cada hilo de rosca aflojado.This assembly and disassembly of the bushing / arms / ring assembly allows, in turn, to regulate the opening pressure of the valve, adapting it to the needs of the user, being able to loosen such a thread, and up to two at most in case if necessary, to obtain a reduction in opening pressure of approximately 20% for each thread loosened.
Por su parte, el eje del obturador puede presentar al menos un rebajo longitudinal en su superficie cilindrica, lo que facilitará la evacuación de impurezas del fluido pasante por la válvula y que pueden acumularse entre el citado eje y el casquillo tubular por el que discurre, bloqueando dicho eje y comprometiendo la funcionalidad de la válvula.On the other hand, the shutter shaft can have at least one longitudinal recess in its cylindrical surface, which will facilitate the evacuation of impurities from the fluid passing through the valve and that can accumulate between said shaft and the tubular bushing through which it runs, blocking said axis and compromising the functionality of the valve.
Estas y otras características se desprenderán mejor de la descripción detallada que sigue, la cual, para facilitar su comprensión, se acompaña de una lámina de dibujos en la que se ha representado un caso práctico de realización que se cita solamente a título de ejemplo no limitativo del alcance de la presente invención.These and other characteristics will be better derived from the detailed description that follows, which, for ease of understanding, is accompanied by a sheet of drawings in which a practical case of embodiment has been represented that is cited only by way of non-limiting example of the scope of the present invention.
DESCRIPCIÓN DE LOS DIBUJOSDESCRIPTION OF THE DRAWINGS
En los dibujos:In the drawings:
La figura 1 muestra una vista en perspectiva explotada de la válvula en cuestión, Las figuras 2 y 3 ilustran la misma en sendas secciones parciales alzadas, y en disposición cerrada y abierta respectivamente, y las figuras 4 y 5 son sendas secciones en planta del eje del obturador a su paso por el casquillo tubular y con distintos rebajos en su superficie cilindrica. DESCRIPCIÓN DE UN EJEMPLO DE REALIZACIÓN De acuerdo con los dibujos, la válvula de retención ilustrada consta de un cuerpo tubular (1) que puede ser (como se ha ilustrado) de una sola monopieza para evitar fugas externas pero que también puede ser de dos piezas acopladas entre sí para fabricar válvulas de gran tamaño, ya que la envergadura de las mismas dificulta su mecanizado si son de una sola monopieza.Figure 1 shows an exploded perspective view of the valve in question, Figures 2 and 3 illustrate the same in partial raised sections, and in closed and open arrangement respectively, and Figures 4 and 5 are planar sections of the shaft of the shutter as it passes through the tubular sleeve and with different recesses in its cylindrical surface. DESCRIPTION OF AN EXAMPLE OF EMBODIMENT According to the drawings, the illustrated check valve consists of a tubular body (1) that can be (as illustrated) of a single piece to prevent external leakage but which can also be of two pieces coupled to each other to manufacture large valves, since the wingspan of the same hinders their machining if they are single-piece.
El cuerpo tubular (1) presenta una boca delantera (2) de entrada del fluido y otra posterior (3) de salida del mismo, ambas interiormente roscadas y estando acoplada en la segunda un anillo (4) exteriormente roscado a cuya superficie interior está unido un casquillo tubular (6) a través de unos brazos radiales (5) que arrancan de la parte delantera de dicho casquillo divergiendo inclinadamente hacia atrás hasta unirse al anillo (4).The tubular body (1) has a front inlet (2) of fluid inlet and a rear outlet (3) of the same, both internally threaded and a ring (4) externally threaded to whose inner surface is attached a tubular bushing (6) through radial arms (5) that start from the front part of said bushing diverging inclined backwards until joining the ring (4).
Por el interior del casquillo tubular (6) discurre guiado un eje (7) que, por el extremo delantero conforma una cabeza discoidal que constituye el obturador (8) de la válvula, actuando contra el mismo un muelle (9) que, ensartado sobre el eje (7) y con el extremo delantero introducido en una ranura anular inferior (8') de dicho obturador, se apoya, por el extremo posterior, sobre el arranque de los brazos (5), quedando la parte extrema posterior de dicho muelle alrededor de una prolongación (6') que el casquillo (6) presenta, impidiendo dicha prolongación y la indicada ranura (8') que el muelle (9) contacte con el eje (7) y pueda dificultar y/o impedir el desplazamiento del mismo.A shaft (7) runs along the inside of the tubular bushing (6) which, at the front end, forms a discoidal head that constitutes the valve plug (8), acting against it a spring (9) which, strung on the shaft (7) and with the front end inserted in a lower annular groove (8 ') of said shutter, rests, by the rear end, on the start of the arms (5), the rear end part of said spring remaining. around an extension (6 ') that the bushing (6) presents, preventing said extension and the indicated groove (8') that the spring (9) contacts the shaft (7) and can hinder and / or prevent the movement of the same.
Asimismo, la prolongación (6') asegura el perfecto guiado del eje (7) y, consiguientemente, del obturador (8), el cual presenta en su cara libre delantera una junta anular periférica y plana (10) que, unida por vulcanizado a un rebajo anular periférico (8") de dicho obturador para evitar su desprendimiento y/o la aparición de partículas extrañas (normalmente arenilla) entre dicha junta y el rebajo (8"), contacta con un asiento circular (11) formado en la boca (2) del cuerpo (1) efectuando el cierre estanco de la misma. El obturador (8) presenta también, en su cara libre, una protuberancia central troncocónica que desvía hacia los lados el fluido que choca contra ella favoreciendo la circulación del mismo, y el eje (7) puede presentar longitudinalmente uno o más rebajos (7') que configurarán distintas secciones del mismo (como la aproximadamente cuadrada con esquinas redondeadas de la figura 4, o la circular cortada por dos planos paralelos de la figura 5) y determinarán unos espacios (13) entre el eje (7) y el casquillo (6) por los que evacuarán las impurezas del fluido que podrían bloquear el desplazamiento de dicho eje. Likewise, the extension (6 ') ensures the perfect guidance of the shaft (7) and, consequently, of the plug (8), which has on its front free face a peripheral and flat annular joint (10) which, joined by vulcanizing to a peripheral annular recess (8 ") of said shutter to prevent its detachment and / or the appearance of foreign particles (usually grit) between said gasket and recess (8"), contact a circular seat (11) formed in the mouth (2) of the body (1) by closing it tightly. The obturator (8) also has, in its free face, a central frustoconical protuberance that deflects towards the sides the fluid that collides with it, favoring its circulation, and the axis (7) can have one or more recesses longitudinally (7 ' ) that will configure different sections of it (such as the approximately square with rounded corners of Figure 4, or the circular cut by two parallel planes of Figure 5) and determine spaces (13) between the axis (7) and the bushing ( 6) by those who will evacuate impurities from the fluid that could block the movement of said axis.

Claims

REIVINDICACIONES
L- Válvula de retención, que comprende un cuerpo tubular (1) en cuyo interior es desplazable axialmente un obturador (8) solicitado elásticamente hacia su posición de cierre y que presenta un eje posterior (7) mediante el cual es guiado por un casquillo tubular (6) ensartado sobre dicho eje y acoplado amoviblemente, a través de unos brazos radiales (5), en la boca (3) del cuerpoL- Check valve, which comprises a tubular body (1) inside which an obturator (8) is elastically axially movable towards its closed position and which has a rear axle (7) by which it is guided by a tubular bushing. (6) skewered on said shaft and removably coupled, through radial arms (5), in the mouth (3) of the body
(1) por la que sale el fluido, caracterizada porque el casquillo tubular (6) presenta, hacia la boca (2) del cuerpo (1) por la que entra el fluido, una prolongación (6') de dicho casquillo que asegura el perfecto guiado del eje (7) y, con él, del obturador (8), y delimita además el recorrido de dicho obturador hacia su posición de apertura.(1) through which the fluid flows, characterized in that the tubular bushing (6) has, towards the mouth (2) of the body (1) through which the fluid enters, an extension (6 ') of said bushing that ensures the perfect guidance of the shaft (7) and, with it, of the shutter (8), and also delimits the path of said shutter towards its opening position.
2.- Válvula de retención, según la reivindicación 1, caracterizada porque los brazos (5) del casquilio (6) se acoplan a la boca (3) del cuerpo (1) a través de un anillo (4) a cuya superficie interior están unidos dichos brazos por el extremo opuesto al que están unidos al indicado casquillo, estando exteriormente roscado el anillo (4) para su acoplamiento a rosca en la indicada boca (3) asimismo roscada.2. Check valve according to claim 1, characterized in that the arms (5) of the bush (6) are coupled to the mouth (3) of the body (1) through a ring (4) whose inner surface are said arms joined by the opposite end to which they are attached to the indicated bushing, the ring (4) being threaded externally for threaded engagement in the said mouth (3) also threaded.
3.- Válvula de retención, según la reivindicación I5 caracterizada porque el eje (7) del elemento obturador (8) presenta al menos un rebajo longitudinal (7') en su superficie cilindrica. 3. Valve according to claim I 5 wherein the shaft (7) of the sealing element (8) has at least one longitudinal recess (7 ') in its cylindrical surface.
PCT/ES2007/000439 2006-08-01 2007-07-18 Retention valve WO2008015304A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP200602077 2006-08-01
ES200602077A ES2291125B1 (en) 2006-08-01 2006-08-01 RETENTION VALVE.

Publications (2)

Publication Number Publication Date
WO2008015304A2 true WO2008015304A2 (en) 2008-02-07
WO2008015304A3 WO2008015304A3 (en) 2010-11-25

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Application Number Title Priority Date Filing Date
PCT/ES2007/000439 WO2008015304A2 (en) 2006-08-01 2007-07-18 Retention valve

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ES (1) ES2291125B1 (en)
WO (1) WO2008015304A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800006131A1 (en) * 2018-06-08 2019-12-08 NON-RETURN VALVE

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1086549A (en) * 1912-09-20 1914-02-10 Richard R Miller Valve.
US2594641A (en) * 1946-08-29 1952-04-29 Henry Valve Company Inc Check valve
US3605802A (en) * 1968-11-02 1971-09-20 Itt Check valve
DE6610152U (en) * 1966-04-27 1973-04-19 Wildfang Dieter Kg CHECK VALVE
FR2285560A1 (en) * 1974-09-21 1976-04-16 Braukmann Armaturen Spring-loaded check valve with conical closure member - having shaft with radially extending disc on free shaft end
US4862913A (en) * 1987-07-09 1989-09-05 Dieter Wildfang Kg Check valve
DE10125276A1 (en) * 2001-05-23 2002-12-19 Steck Ulrike Non-return valve has bush in casing, in which valve stem is mounted, which has longitudinal grooves, so that there are linear contact surfaces between bush and valve stem
EP1411284A1 (en) * 2002-10-15 2004-04-21 Genebre, S.A. A check valve
EP1574767A1 (en) * 2004-03-11 2005-09-14 Genebre, S.A. A check valve
EP1580467A1 (en) * 2004-03-23 2005-09-28 Genebre, S.A. Ball valve with built-in check valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57154565A (en) * 1981-03-17 1982-09-24 Yutaka Yamada Lift type check valve

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1086549A (en) * 1912-09-20 1914-02-10 Richard R Miller Valve.
US2594641A (en) * 1946-08-29 1952-04-29 Henry Valve Company Inc Check valve
DE6610152U (en) * 1966-04-27 1973-04-19 Wildfang Dieter Kg CHECK VALVE
US3605802A (en) * 1968-11-02 1971-09-20 Itt Check valve
FR2285560A1 (en) * 1974-09-21 1976-04-16 Braukmann Armaturen Spring-loaded check valve with conical closure member - having shaft with radially extending disc on free shaft end
US4862913A (en) * 1987-07-09 1989-09-05 Dieter Wildfang Kg Check valve
DE10125276A1 (en) * 2001-05-23 2002-12-19 Steck Ulrike Non-return valve has bush in casing, in which valve stem is mounted, which has longitudinal grooves, so that there are linear contact surfaces between bush and valve stem
EP1411284A1 (en) * 2002-10-15 2004-04-21 Genebre, S.A. A check valve
EP1574767A1 (en) * 2004-03-11 2005-09-14 Genebre, S.A. A check valve
EP1580467A1 (en) * 2004-03-23 2005-09-28 Genebre, S.A. Ball valve with built-in check valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800006131A1 (en) * 2018-06-08 2019-12-08 NON-RETURN VALVE
WO2019234658A1 (en) * 2018-06-08 2019-12-12 Valvosanitaria Bugatti S.P.A. Check valve

Also Published As

Publication number Publication date
WO2008015304A3 (en) 2010-11-25
ES2291125B1 (en) 2009-01-16
ES2291125A1 (en) 2008-02-16

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