WO2018015866A1 - Ensemble clapet anti-retour - Google Patents

Ensemble clapet anti-retour Download PDF

Info

Publication number
WO2018015866A1
WO2018015866A1 PCT/IB2017/054301 IB2017054301W WO2018015866A1 WO 2018015866 A1 WO2018015866 A1 WO 2018015866A1 IB 2017054301 W IB2017054301 W IB 2017054301W WO 2018015866 A1 WO2018015866 A1 WO 2018015866A1
Authority
WO
WIPO (PCT)
Prior art keywords
check valve
valve
valve body
fluid conduit
valve plate
Prior art date
Application number
PCT/IB2017/054301
Other languages
English (en)
Inventor
Erwin Louis Annie CLAES
Original Assignee
Atlas Copco Airpower, Naamloze Vennootschap
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
Priority claimed from BE2016/5708A external-priority patent/BE1024421B1/nl
Application filed by Atlas Copco Airpower, Naamloze Vennootschap filed Critical Atlas Copco Airpower, Naamloze Vennootschap
Priority to AU2017300993A priority Critical patent/AU2017300993B2/en
Priority to CN201780044542.0A priority patent/CN109790837A/zh
Priority to EP17749541.3A priority patent/EP3488109B1/fr
Priority to US16/313,987 priority patent/US11293558B2/en
Priority to ES17749541T priority patent/ES2917702T3/es
Priority to PL17749541T priority patent/PL3488109T3/pl
Priority to BR112019001064-5A priority patent/BR112019001064A2/pt
Publication of WO2018015866A1 publication Critical patent/WO2018015866A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1037—Flap valves
    • F04B53/104—Flap valves the closure member being a rigid element oscillating around a fixed point
    • 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
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member

Definitions

  • This invention relates to a check valve assembly configured to be mounted at the interface between a compressor unit or a vacuum pump and an external network, for preventing a fluid flow in the upstream direction
  • the check valve assembly comprising: a valve body adapted to receive a valve plate, said valve plate being adapted to pivot between a first open position in which fluid can flow through said check valve and a second closed position in which fluid cannot flow through said check valve; said valve body being adapted to be connected to a discharge port of a compressor unit or to the intake port of a vacuum pump through a first fluid conduit; a second fluid conduit attachable to the valve body, said second fluid conduit being adapted to be connected to an external network; a shaft and at least one bearing for connecting the valve plate to the valve body.
  • the turning plate is mounted to the housing through a rotary shaft, a lever and a rotary hydraulic damper.
  • a further object of the present invention is to provide a valve with a long life span, having a simple design with a simple and fast assembly, and at the same time having low maintenance and manufacturing costs.
  • Yet another object of the present invention is to provide a valve that would eliminate the risk of experiencing unwanted displacements during functioning.
  • the present invention solves at least one of the above and/or other problems by providing a check valve assembly configured to be mounted at the interface between a compressor unit or a vacuum pump and an external network, for preventing a fluid flow in the upstream direction, the check valve assembly comprising:
  • valve body adapted to receive a valve plate, said valve plate being adapted to pivot between a first open position in which fluid can flow through said check valve and a second closed position in which fluid cannot flow through said check valve;
  • said valve body being adapted to be connected to a discharge port of a compressor unit or to the intake port of a vacuum pump through a first fluid conduit;
  • valve plate comprises an elongated area having a hollow tube through which the shaft is inserted for rotatably mounting said valve plate in the valve body and, in that, said at least one bearing is positioned on said shaft and within said hollow tube.
  • valve plate comprises an elongated area having a hollow tube through which the shaft is inserted, a much better and robust support for the shaft is provided. Because the assembly comprises at least one bearing mounted within said hollow tube, the robustness is even more increased and, consequently, the risks of experiencing breakages at the level of the connection between the valve plate and the valve body are significantly reduced, if not even eliminated.
  • valve plate and the valve body can be made from casted components and the valve assembly according to the present invention uses only a very limited number of components and has a simple layout.
  • the valve plate reacts very fast to sudden changes in pressure at the level of the external network and pivots into a second closed position, avoiding a back rotation type of movement for the element of the compressor unit or of the vacuum pump .
  • check valve in case the check valve is mounted in a compressor unit, said check valve avoids that compressed air flows from the external network back into the compressor unit, preventing damages to the compressor element .
  • check valve if such a check valve is mounted in a vacuum pump, said check valve avoids that air from the vacuum pump flows into the external network, preventing damages to the vacuum pump element.
  • the compressor unit should be understood as the complete compressor installation, including the compressor element, all the typical connection pipes and valves, the compressor unit housing and possibly the motor driving the compressor element .
  • the vacuum pump should be understood as the complete vacuum pump installation, including the vacuum element, all the typical connection pipes and valves, the vacuum pump housing and possibly the motor driving the vacuum pump element.
  • the compressor element should be understood as compressor element casing in which the compression process takes place by means of a rotor or through a reciprocating movement.
  • the vacuum element should be understood as the vacuum element casing in which the vacuum process takes place by means of a rotor or through a reciprocating movement .
  • a more complex compressor installation can be created in order to meet the demand at the external network. Accordingly, a number of compressor units can be mounted in parallel and provide compressed air to the external network, such compressor units having the same pressure and flow characteristics, or having different pressure and flow characteristics.
  • a check valve according to the present invention is mounted on the discharge port of each compressor unit.
  • a typical situation can be the one in which the pressure measured within the second fluid conduit can reach higher values than the one measured within the first fluid conduit because of, for example, a compressor unit of a higher pressure and flow characteristic would function in parallel with a compressor unit having a lower pressure and flow characteristic, or because one compressor unit would function and another one would be in stand-by.
  • a check valve according to the present invention would not be used within such a system, compressed air would be allowed to flow from the external network into the compressor unit having a lower pressure value within the first fluid conduit, reaching a dangerous situation which can damage the compressor element and other components part of the compressor unit, such as different valves or connect ions .
  • the motor driving the compressor element or the vacuum element needs less power to start said compressor unit or vacuum pump. Accordingly, the check valve of the present invention is in a second closed position before the compressor unit or vacuum pump is started .
  • the pressure measured within the first fluid conduit is approximately equal to the pressure measured at the inlet of the compressor unit or vacuum pump, allowing the motor to generate less power for starting said compressor unit or vacuum pump. At the same time, a much higher efficiency is achieved, prolonging the lifetime of the motor, and allowing a user of such compressor unit or vacuum pump to reduce energy costs as well as maintenance costs .
  • the pressure measured within the first fluid conduit would have the same value as the pressure value measured within the external network, which can be much higher than the pressure value measured at the inlet of the compressor unit or vacuum pump. Consequently, the motor driving the compressor element or vacuum pump would need to generate more power during the starting sequence.
  • a blow-off valve can further be mounted within the first fluid conduit, between the compressor unit and the check valve. Said blow-off valve allowing the fluid present within the compressor unit to be vented to the atmosphere once the compressor unit is brought in an unloaded state or is switched off. Because in such a situation, the check valve will be brought into a second closed position, compressed air from the external network is not allowed to reach said blow-off valve and be vented to the atmosphere, maintaining a very high efficiency of the compressor unit at all times.
  • the present invention is further directed to the use of a check valve according to the present invention in controlling the flow of fluid at the discharge of a compressor unit or at the intake port of a vacuum pump.
  • figure 1 schematically represents a compressed air system according to an embodiment of the present invention
  • figure 2 schematically represents a top view of a check valve assembly according to one embodiment of the present invention
  • figure 3 schematically represents a valve plate according to an embodiment of the present invention
  • figure 4 schematically represents a slightly rotated 3D back view of a check valve assembly according to an embodiment of the present invention
  • figure 5 schematically represents a cross-section through the body of the valve according to line I-I in figure 2
  • figure 6 schematically represents a cross-section of a check valve assembly mounted within a fluid conduit according to an embodiment of the present invention
  • figure 7 schematically illustrates a cross-section through the body of the valve and the valve plate according to line II-II in figure 2
  • figure 8 schematically represents a cross-section through the elongated area of the valve plate and through the valve
  • Figure 1 illustrates a compressed air system whereby a compressor unit 1 provides compressed air to an external network 2.
  • the flow of fluid at a discharge port 3 of the compressor unit 1 is controlled by means of check valve as sembly 4.
  • figure 11 illustrates a vacuum pump system whereby a vacuum pump 100 provides vacuum to an external network 2.
  • the flow of fluid at the intake port 300 of the vacuum pump 100 is controlled by means of check valve as sembly 4.
  • the check valve assembly 4 comprises a valve body 5 receiving a valve plate 6, as illustrated at least in figure 2.
  • valve plate 6 is being adapted to pivot between a first open position in which fluid can flow through said check valve 4 and a second closed position in which fluid cannot flow through said check valve 4, as illustrated in figure 6 and figure 12.
  • valve body 5 is preferably mounted to a discharge port 3 of said compressor unit 1 through a first fluid conduit 7.
  • a second fluid conduit 8 is attachable to the valve body 5, on the opposite side from the first fluid conduit 7, said second fluid conduit 8 creating a space in which the valve plate 6 pivots freely between the first open position and the second closed position.
  • Said second fluid conduit 8 being adapted to be connected to an external network 2.
  • the valve body 5 is preferably mounted to an intake port 300 of said vacuum pump 100 through a first fluid conduit 7, as illustrated in figure 11, said first fluid conduit 7 creating a space in which the valve plate 6 pivots freely between the first open position and the second closed position, as can be seen in figure 12.
  • a second fluid conduit 8 is attachable to the valve body, on the opposite side from the first fluid conduit 7, said second fluid conduit 8 being adapted to be connected to an external network 2.
  • the check valve assembly 4 preferably further comprises a shaft 9 and at least one bearing 10 for connecting the valve plate to the valve body 5.
  • the valve plate 6 comprises an elongated area 11 having a hollow tube through which the shaft 9 is inserted for rotatably mounting said valve plate 6 in the valve body 5. Because the shaft 9 is completely inserted through said hollow tube, said shaft 9 is being reinforced on the entire length of the tube, and no week structural points are created.
  • the at least one bearing 10 is positioned on said shaft 9 and within said hollow tube.
  • check valve assembly 4 is mounted between the first fluid conduit 7 and the second fluid conduit 8, a structural limitation is automatically created by such flow conduits, 7 and 8, and the valve cannot come loose during the functioning period.
  • valve body 5 and the valve plate 6 can be manufactured from casted metal, no structural week point is encountered throughout their surface.
  • the valve plate 6 is illustrated as being relatively circular, while excluding the elongated area 11, in the context of the present invention it should be understood that such a plate can be made of any shape, such as for example and not limiting to: oval, square, rectangular, rhomboid, or any other desired shape, depending on the application such check valve assembly 4 is designed for.
  • valve body 5 should not be limited to a circular layout, and it should be understood that any shape can be used, without departing from the scope of the invention, such as for example and not limiting to: oval, square, rectangular, or any other desired shape.
  • the check valve 4 comprises two bearings 10 mounted within the hollow tube, spaced apart from one another, said at least two bearings 10 being preferably mounted on said shaft 9, and within the hollow tube.
  • Such a layout ensures an even more robust structure.
  • standard components can be used.
  • spaced apart from one another should be understood as at a distance greater than zero from one another.
  • said two bearings 10 are mounted at the extremities of the hollow tube.
  • valve body 5 comprises a recess 12 for receiving the elongated area 11 therein, as illustrated at least in figure 2, and figure 5.
  • the at least two bearings 10 are mounted in direct contact with said valve body 5, creating therefore a very strong structural connect ion .
  • the shaft 9 is preferably inserted into the elongated area and the at least two bearings 10 are being received thereon .
  • the shaft 9 extends within the valve body 5 over a minimum distance, at both its ends, as illustrated in figure 8.
  • the check valve assembly 4 further comprises a locking pin 13 mounted through the valve body 5, for securing the shaft into said valve body 5. It goes without saying that, as long as the locking pin 13 is in place and the check valve assembly 4 is functioning in nominal parameters, the shaft 9 cannot be un-mounted.
  • Said locking pin 13 can be any type of blocking mechanism such as for example and not limiting to: a screw, a bolt, a glue or a seal inserted in a cavity, or the like, said cavity being relatively perpendicular on the shaft 9, or under an angle with respect to the shaft 9.
  • valve body 5 preferably comprises an orifice 14 through a lateral wall, though which the shaft 9 is slid into its final position.
  • a sealing plug 15 is attached onto the orifice 14.
  • Another sealing plug 15 is preferably mounted onto the orifice receiving the locking pin 13.
  • the valve plate 6 is adapted to be mounted eccentrically in the valve body 5.
  • eccentrically should be understood as follows: the central point of the valve plate 6, preferably determined by virtually excluding the elongated area 11, case in which the contour valve plate 6 defines a circle, said central point is positioned in a different location than the central point of the valve body 5.
  • eccentrically should be understood as: the valve plate 6 is not received centrally within the valve body 5.
  • tests have shown that, because the valve plate 6 and the valve body 5 are located eccentrically, the check valve 4 according to the present invention can open further than standard valves. This translates into a very small pressure drop between the pressure measured within the first fluid conduit 7 and the pressure measured within the second fluid conduit 8.
  • the valve body 5 further comprises a seat 16 for receiving said valve plate 6, said seat 16 having a lower part, Hi, in the vicinity where said elongated area 11 is mounted, and a higher part, H2 , on the opposite side from where said elongated area 11 is mounted, as illustrated in figure 6.
  • said seat 16 is a continuous structure along the surface of the valve body 5, receiving the valve plate 6 on its entire circumference.
  • said valve plate 6 can comprise a thicker structure on its exterior circumference where said valve plate 6 enters in contact with the seat 16, said structure being in the shape of a flange or a rim.
  • valve plate 6 is adapted to be received on said seat 16 under an angle a with respect to a horizontal plane AA' , said angle a being created due to the difference between the higher part H2, and the lower part HI .
  • the angle a has been determined by drawing a vertical line AA' , from the lowest point of the seat 16, corresponding to the corner of the recess 12, and intersecting that line with a line AA' ' drawn as a continuation of the edge 17 of the valve plate 6, said edge 17 being brought in direct contact with the seat 16 when the valve plate 6 is in a second closed position .
  • flange F determines a plane FF that is relatively vertical during a normal operation of the check valve 4, and edge 17 determines a plane HH
  • the angle a is defined as the angle between the plane FF and HH, at the intersection of these two planes, as shown in figure 6.
  • said angle a can be between more than 0° and 20°, more preferably between 5° and 10°, even more preferably, said angle a is selected to be of approximately 5°.
  • valve plate 6 is adapted to be mounted eccentrically with respect to the valve body 5 and at the same time, the valve seat 16 creates the angle a of approximately 5°, as defined above.
  • the opening angle of the valve plate 6 with respect to the horizontal line AA' is of approximately 58°. Consequently, a very low pressure drop over the check valve 4 is maintained, while at the same time said check valve 4 is robust and reliable.
  • valve body 5 further comprises a channel on its exterior surface (not shown) for locking said valve body 5 within the first fluid conduit 7.
  • the check valve assembly can comprise a magnet 18, mounted on the seat 16 or within a recess created in the seat 16, such that the valve plate 6 comes in direct contact with said magnet 18 when the check valve 4 is in the second closed position, as illustrated in figure 10.
  • the magnet 18 is preferably connected through an electrical connection 19 to an electrical circuit 20.
  • the magnet 18 is charged by the electronic circuit 20 by allowing an electrical current to flow through said electrical connection 19, such that the check valve 4 is maintained in a second closed position.
  • the electrical circuit 20 stops the electrical current through said electrical connection 19, such that the magnet 18 becomes de-energized and the check valve 4 can pivot into a first open position when the pressure within the first fluid conduit 7 is higher than the pressure within the second fluid conduit 8 in case of a compressor unit 1, or when the pressure within said first fluid conduit 7 is lower than the pressure within the second fluid conduit 8 in the case of a vacuum pump 100.
  • the functioning principle is very simple and as follows.
  • valve plate 6 When the system is started, the valve plate 6 is in a second closed position.
  • valve plate 6 pivots between a second closed position and a first open position until the two pressures measured within said first and second fluid conduits 7 and 8 are relatively equal.
  • valve plate 6 pivots between a second closed position and a first open position until the two pressures measured within said first and second fluid conduits 7 and 8 are relatively equal .
  • valve plate 6 can change its opening angle continuously, according to the double arrow shown in figure 6 or figure 12, depending on the pressure difference between the pressure measured within the first fluid conduit 7 and the pressure measured within the second fluid conduit 8, and therefore is not limited to only two positions: the first open position and the second closed position, any intermediary opening angle is possible.
  • valve plate 6 pivots from a first open position to a second closed position .
  • the valve plate 6 pivots from a first open position to a second closed position . Consequently, the check valve assembly 4 according to the present invention acts as a non-return valve.
  • a dryer (not shown) can be mounted downstream from the compressor unit 1 within the layout of figure 1, between the check valve assembly 4 and the inlet 3 of the compressor unit 1.
  • check valve assembly 4 in such a case, preferably remains the same as for a check valve assembly 4 mounted within a compressor unit 1 and described within the present paper.
  • the present invention is by no means limited to the embodiments described as an example and shown in the drawings, but such a check valve assembly 4 can be realized in all kinds of variants, without departing from the scope of the invention.

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

Abstract

La présente invention concerne un ensemble clapet anti-retour destiné à un compresseur (1) ou à une pompe (100) à vide et comportant : - un corps (5) de clapet prévu pour recevoir une plaque (6) de clapet, ladite plaque (6) de clapet pivotant entre une première position ouverte et une deuxième position fermée; - ledit corps (5) de clapet étant relié à un orifice (3) de refoulement d'un unité (1) de compresseur ou à l'orifice (300) d'admission d'une pompe (100) à vide; - un deuxième conduit (8) à fluide pouvant être fixé au corps (5) de clapet, ledit deuxième conduit (8) à fluide étant relié à un réseau externe (2); - un arbre (9) et au moins un palier (10) servant à relier la plaque (6) de clapet au corps (5) de clapet; caractérisé en ce que la plaque (6) de clapet comporte une zone allongée (11) dotée d'un tube creux à travers lequel l'arbre (9) est inséré pour monter de façon pivotante ladite plaque (6) de clapet dans le corps (5) de clapet, et en ce que ledit ou lesdits paliers (10) sont positionnés sur ledit arbre (9) et à l'intérieur dudit tube creux.
PCT/IB2017/054301 2016-07-20 2017-07-17 Ensemble clapet anti-retour WO2018015866A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU2017300993A AU2017300993B2 (en) 2016-07-20 2017-07-17 Check valve assembly
CN201780044542.0A CN109790837A (zh) 2016-07-20 2017-07-17 止回阀组件
EP17749541.3A EP3488109B1 (fr) 2016-07-20 2017-07-17 Ensemble clapet anti-retour
US16/313,987 US11293558B2 (en) 2016-07-20 2017-07-17 Check valve assembly
ES17749541T ES2917702T3 (es) 2016-07-20 2017-07-17 Ensamblado de la válvula de retención
PL17749541T PL3488109T3 (pl) 2016-07-20 2017-07-17 Zespół zaworu zwrotnego
BR112019001064-5A BR112019001064A2 (pt) 2016-07-20 2017-07-17 montagem de válvula de retenção

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201662364352P 2016-07-20 2016-07-20
US62/364,352 2016-07-20
BE2016/5708A BE1024421B1 (nl) 2016-07-20 2016-09-21 Terugslagklepassemblage
BE2016/5708 2016-09-21

Publications (1)

Publication Number Publication Date
WO2018015866A1 true WO2018015866A1 (fr) 2018-01-25

Family

ID=60993260

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/054301 WO2018015866A1 (fr) 2016-07-20 2017-07-17 Ensemble clapet anti-retour

Country Status (1)

Country Link
WO (1) WO2018015866A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB175787A (en) * 1920-12-01 1922-03-01 Eugene Henri Degory Improvements in carburettors for internal combustion engines
EP0233445A1 (fr) * 1985-11-20 1987-08-26 Hoerbiger Ventilwerke Aktiengesellschaft Clapet de retenue
DE3829856A1 (de) * 1988-09-02 1990-03-08 Preussag Ag Bauwesen Rueckschlagklappe
RU2177574C2 (ru) 2000-01-06 2001-12-27 Новиков Михаил Иванович Обратный клапан
RU2187030C2 (ru) 2000-07-17 2002-08-10 ОАО "Калужский турбинный завод" Клапан обратный поворотный
CN2842015Y (zh) * 2005-11-24 2006-11-29 复盛股份有限公司 螺旋式冷媒压缩机用止回阀
WO2011047437A1 (fr) * 2009-10-23 2011-04-28 Lyn Kirk Ensemble clapet de non-retour à volet pivotant, généralement destiné à être inséré dans des siphons de sol
CN104564689A (zh) * 2014-11-04 2015-04-29 苏州艾柏特精密机械有限公司 一种外配重式进气阀

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB175787A (en) * 1920-12-01 1922-03-01 Eugene Henri Degory Improvements in carburettors for internal combustion engines
EP0233445A1 (fr) * 1985-11-20 1987-08-26 Hoerbiger Ventilwerke Aktiengesellschaft Clapet de retenue
DE3829856A1 (de) * 1988-09-02 1990-03-08 Preussag Ag Bauwesen Rueckschlagklappe
RU2177574C2 (ru) 2000-01-06 2001-12-27 Новиков Михаил Иванович Обратный клапан
RU2187030C2 (ru) 2000-07-17 2002-08-10 ОАО "Калужский турбинный завод" Клапан обратный поворотный
CN2842015Y (zh) * 2005-11-24 2006-11-29 复盛股份有限公司 螺旋式冷媒压缩机用止回阀
WO2011047437A1 (fr) * 2009-10-23 2011-04-28 Lyn Kirk Ensemble clapet de non-retour à volet pivotant, généralement destiné à être inséré dans des siphons de sol
CN104564689A (zh) * 2014-11-04 2015-04-29 苏州艾柏特精密机械有限公司 一种外配重式进气阀

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