WO2014080663A1 - 逆止弁 - Google Patents

逆止弁 Download PDF

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Publication number
WO2014080663A1
WO2014080663A1 PCT/JP2013/068607 JP2013068607W WO2014080663A1 WO 2014080663 A1 WO2014080663 A1 WO 2014080663A1 JP 2013068607 W JP2013068607 W JP 2013068607W WO 2014080663 A1 WO2014080663 A1 WO 2014080663A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication hole
valve body
valve
radial
check valve
Prior art date
Application number
PCT/JP2013/068607
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
悠 齊藤
Original Assignee
株式会社コガネイ
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 株式会社コガネイ filed Critical 株式会社コガネイ
Priority to KR1020157000346A priority Critical patent/KR101653932B1/ko
Priority to JP2014548474A priority patent/JP5981562B2/ja
Publication of WO2014080663A1 publication Critical patent/WO2014080663A1/ja

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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
    • 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
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F16K15/182—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism
    • F16K15/1826—Check valves which can be actuated by a pilot valve
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves

Definitions

  • the present invention relates to a check valve having a valve body that allows fluid flow in one direction and blocks flow in the reverse direction.
  • the check valve is also referred to as a check valve, and is used in a fluid pressure flow path for guiding fluid such as compressed air or liquid.
  • the check valve is used to allow the fluid to flow only in one direction and prevent the fluid from flowing in the reverse direction.
  • the check valve has a valve housing in which a first port to which a first pipe for guiding fluid is connected and a second port to which a second pipe is connected are formed.
  • the valve body mounted in the flow path between both ports moves freely in the axial direction, and is positioned at a position where it opens away from the valve seat and a position where it closes and closes the valve seat To do.
  • a check valve having a poppet-type valve body has a form in which a valve body that opens and closes a valve seat is attached to an outflow hole so as to be movable in an axial direction, as described in Patent Document 1.
  • an annular valve seat is provided at a boundary portion between an inflow hole of a valve housing and an outflow hole having an inner diameter larger than the inflow hole.
  • the valve body is provided with a conical head at one end, and the base on the other end is provided with a cylinder that slides on the inner surface of the outflow hole.
  • a communication hole for guiding the fluid flowing into the outflow hole to the outside is provided in the base.
  • a cylindrical base portion that slides on the inner surface of the small-diameter hole on the inflow side, and a head provided with an annular protrusion that opens and closes the valve seat are provided.
  • Some have a valve body with a portion.
  • a cross passage formed in the cylindrical base portion connects the small diameter hole on the inflow side and the large diameter hole on the outflow side.
  • a bottomed axial communication hole having a bottom surface on the head side of the valve body is formed inside the valve body. Further, a radial communication hole is formed in the valve body so that the axial communication hole communicates with the outflow hole when the valve body is separated from the valve seat.
  • the valve body To prevent fluid leakage from between the valve seat and the valve body when the valve body closes the valve seat, make sure that the head of the valve body is in close contact with the valve seat surface to improve the sealing performance of the valve seat. Need to increase. When the valve body is tilted and contacts the valve seat, the sealing performance of the valve seat is lowered and leakage from the valve seat occurs. In order to improve the sealing performance of the valve seat, the coaxiality between the central axis of the valve body and the central axis of the communication hole that accommodates the valve body is set so that the valve body does not tilt when the valve body moves in the axial direction. Need to increase. Increasing the axial length of the sliding portion of the valve body can increase the coaxiality, but the axial dimension of the valve body is increased and the check valve cannot be reduced in size.
  • An object of the present invention is to provide a check valve capable of ensuring a fluid flow rate when the valve seat is opened without increasing the axial length of the valve body.
  • An object of the present invention is to provide a check valve capable of enhancing the sealing performance when the valve seat is closed while ensuring the fluid flow rate when the valve seat is opened.
  • the check valve according to the present invention includes a first communication hole that opens to the first port and a second communication hole that opens to the second port, and the first and second communication holes
  • a spring member for biasing, and the valve body is provided on one end portion side of the valve body and opens and closes the valve seat, and is provided on the other end side with respect to the head portion.
  • the valve body is formed with an axial communication hole that opens in the other end surface of the valve body and extends in the axial direction toward one end portion of the valve body.
  • a radial communication hole that extends in the direction and communicates the axial communication hole and the guide channel is formed in the valve body by opening the sliding surface and the communication outer peripheral surface.
  • a radial communication hole is formed across the sliding surface that is in sliding contact with the inner peripheral surface of the second communication hole and the communication outer peripheral surface that forms the guide channel, and a part of the sliding surface is in radial communication.
  • a hole is formed. Therefore, the axial length of the sliding surface can be increased without increasing the axial length of the valve element. Thereby, it can prevent that a valve body inclines at the time of valve body movement, and can improve the sealing performance of the valve seat when a valve body obstruct
  • the radial communication hole is formed across the communication outer peripheral surface and the sliding surface. That is, the radial direction communication hole has an opening portion opened in the radial direction on the communication outer peripheral surface and an opening portion opened in the axial direction so as to face the guide flow channel, and communicates with the guide flow channel.
  • the communication opening degree between the guide channel and the radial communication hole can be increased. Therefore, the fluid flow rate when the valve seat is opened can be increased without increasing the axial length of the valve body.
  • FIG. 3 is an enlarged perspective view of the valve body shown in FIGS. 1 and 2.
  • (A) is a front view of FIG. 3
  • (B) is sectional drawing of FIG.
  • (A) is a front view which shows the modification of a valve body
  • (B) is a longitudinal cross-sectional view of (A).
  • FIG. is sectional drawing which shows the non-return valve as another comparative example.
  • the check valve 10 has a valve housing 12 in which a stepped through hole 11 is formed.
  • a first port 13 is formed at one end of the through hole.
  • a joint 14 is attached to the first port 13.
  • a second port 15 is formed at the other end of the through hole 11.
  • a joint 16 is attached to the second port 15.
  • pipes 17 and 18 made of hoses and pipes for guiding air are attached to the joints 14 and 16, respectively.
  • the through-hole 11 has a first communication hole 21 that opens to the first port 13 and a second communication hole 22 that opens to the second port 15.
  • the inner diameter of the second communication hole 22 is larger than the inner diameter of the first communication hole 21.
  • a valve seat 23 is provided at the boundary between the first communication hole 21 that is a small-diameter communication hole and the second communication hole 22 that is a large-diameter communication hole.
  • the valve seat 23 has a tapered surface having an inner diameter that increases from the first communication hole 21 toward the second communication hole 22. Instead of the tapered surface, the valve seat 23 may be a radial surface perpendicular to the axial direction of the communication holes 21 and 22.
  • a valve body 24 is mounted in the second communication hole 22 so as to be slidable in the axial direction.
  • An annular groove 27 in which a seal member 26 is mounted is formed in a head 25 provided at one end of the valve body 24.
  • the seal member 26 attached to the head portion 25 of the valve body 24 opens and closes the valve seat 23 by sliding the valve body 24 in the axial direction.
  • FIG. 1 when the seal member 26 of the valve body 24 is in close contact with the valve seat 23, the valve seat 23 is closed.
  • FIG. 2 when the seal member 26 of the head portion 25 of the valve body 24 is separated from the valve seat 23, the valve seat 23 is opened.
  • the other end side of the valve body 24 is a base portion 28 integrated with the head portion 25, and the base portion 28 is provided with a cylindrical sliding portion 31.
  • the outer diameter of the sliding portion 31 is larger than the outer diameter of the head 25.
  • the sliding portion 31 has a sliding surface 32 that comes into sliding contact with the inner peripheral surface of the second communication hole 22.
  • a spring mounting portion 33 having a smaller diameter than the sliding portion 31 and a small diameter sliding portion 34 having a smaller diameter than the spring mounting portion 33 are provided on the base portion 28.
  • an annular spring receiving member 35 is attached to the second communication hole 22.
  • a compression coil spring 36 is mounted between the spring receiving member 35 and the sliding portion 31.
  • the compression coil spring 36 biases the spring force in the direction toward the valve seat 23 against the valve body 24.
  • One end of the compression coil spring 36 is in contact with the end surface of the spring receiving member 35, and the other end of the compression coil spring 36 is in contact with the radial end surface 37 between the sliding portion 31 and the spring mounting portion 33.
  • the small-diameter sliding portion 34 has a small-diameter sliding surface 38 that is in sliding contact with the inner peripheral surface of the spring receiving member 35.
  • a flow path forming portion 41 having a smaller diameter than the sliding portion 31 is provided between the head 25 and the sliding portion 31.
  • a communication outer peripheral surface 43 is provided between the outer peripheral surface of the head 25 and the sliding surface 32.
  • the communication outer peripheral surface 43 forms a guide channel 42 between the communication outer peripheral surface 43 and the inner peripheral surface of the second communication hole 22.
  • an axial communication hole 44 extending in the axial direction is formed inside the valve body 24.
  • the axial communication hole 44 is open to the other end surface of the valve body 24, that is, the end surface of the base portion 28, and is a bottomed hole having a bottom surface on the head 25 side.
  • a radial communication hole 45 is formed in the valve body 24.
  • the radial direction communication hole 45 allows the portion on the bottom surface side of the axial direction communication hole 44 to communicate with the guide channel 42.
  • the bottom surface of the axial communication hole 44 has a portion that is continuous with the inner peripheral surface of the radial communication hole 45 without a step, and the bottom surface is in contact with the inner peripheral surface of the radial communication hole 45.
  • a total of four radial communication holes 45 are formed approximately every 90 degrees in the circumferential direction. As shown in FIG. 4B, when the diameter of the axial communication hole 44 is D and the diameter of each radial communication hole 45 is d, the diameter d is smaller than the diameter D.
  • the air supplied from the pipe 17 to the first communication hole 21 flows into the second communication hole 22 and passes through the radial communication hole 45 and the axial communication hole 44 formed in the valve body 24. It flows out from the pipe 18 to the outside.
  • the seal member 26 of the valve body 24 comes into close contact with the valve seat 23 and the valve seat 23 is closed. Accordingly, as shown in FIG. 1, the air guided by the pipe 17 and supplied to the first communication hole 21 does not flow into the second communication hole 22.
  • the check valve 10 allows the flow of fluid from the first communication hole 21 to the second communication hole 22 and prevents the flow from the second communication hole 22 to the first communication hole 21. .
  • the radial communication hole 45 is formed at a position across the sliding portion 31 and the flow path forming portion 41 in the axial direction.
  • the radially inner end of each radial communication hole 45 opens at the bottom of the axial communication hole 44.
  • the radially outer end of the radial communication hole 45 is open on both the sliding surface 32 of the sliding portion 31 and the communication outer peripheral surface 43 of the flow path forming portion 41 so as to straddle in the axial direction.
  • a semicircular portion of the cross section of the circular radial communication hole 45 is formed in the sliding portion 31, and the remaining semicircular portion is formed in the flow path forming portion 41.
  • An outer end portion of each radial communication hole 45 opens in a radial step surface 46 between the sliding portion 31 and the flow path forming portion 41.
  • the center of the radial communication hole 45 is located at substantially the same position as the axial position of the step surface 46. Therefore, a portion of the outer end that opens to the sliding surface 32 is substantially not opened because it is covered by the second communication hole 22 as shown in FIG. However, there is an edge 47 between the step surface 46 and the outer end portion of the radial communication hole 45, and the communication opening 48 between the edges 47 opens in the axial direction opposite to the guide channel 42. To do.
  • the outer end of the radial communication hole 45 has a portion that opens to the communication outer peripheral surface 43 in the direction along the guide flow path 42, and an opening to the step surface 46 that faces the guide flow path 42 in the axial direction. And a portion to be
  • the air supplied from the pipe 17 and flowing into the second communication hole 22 from the first communication hole 21 opens the radial communication hole 45 in the communication outer peripheral surface 43.
  • the gas flows into the radial communication hole 45 from both the part and the part opened to the step surface 46 forming the communication opening 48, and flows out from the pipe 18 through the axial communication hole 44.
  • the outer end of the radial communication hole 45 does not open entirely on the communication outer peripheral surface 43, but the radial communication hole 45 via the communication opening 48 that faces the guide channel 42 in the axial direction.
  • the guide flow path 42 communicate with each other, the flow cross-sectional area of the guide flow path 42 and the axial communication hole 44 can be increased without increasing the diameter of each radial communication hole 45.
  • the total cross-sectional area of the four radial communication holes 45 is set to an area that is equal to or larger than the cross-sectional area of the axial communication hole 44, and the flow resistance of the radial communication holes 45 is that of the axial communication hole 44. It is equal to or smaller than the distribution resistance.
  • the axial length of the valve body 24 When the axial length of the valve body 24 is increased, the axial length of the check valve 10 is increased, so that the check valve cannot be reduced in size.
  • the radial communication hole 45 is formed only in the flow path forming part 41 without straddling the sliding part 31 and the flow path forming part 41, the entire opening of the radial communication hole 45 is communicated with the outer peripheral surface. 43 will open. In that case, since the axial dimension of the flow path forming portion 41 must be increased so that the radial communication hole 45 does not interfere with the annular groove 27, the axial dimension of the valve body 24 becomes longer. In order to open the radial communication hole 45 in the communication outer peripheral surface 43 without increasing the axial dimension of the valve body 24, the axial dimension of the sliding portion 31 is shortened.
  • valve body 24 since the valve body 24 will fall easily with respect to an axial direction when the valve body 24 moves to an axial direction, the valve body 24 may incline and may contact the valve seat 23. FIG. When the valve body 24 is inclined and the valve seat 23 is closed, the seal member 26 comes into contact with the valve seat 23 and the sealing performance of the valve body 24 is deteriorated.
  • the radial communication hole 45 is formed so as to straddle the sliding portion 31 and the flow path forming portion 41, the axial length of the sliding portion 31 is increased. can do. As a result, the valve body 24 is unlikely to fall down in the axial direction, so that the seal member 26 can be prevented from coming into contact with the valve seat 23 when the valve seat 23 is closed. Thereby, the sealing performance of the valve body 24 could be enhanced without increasing the length of the valve body 24. In addition, the flow area or flow volume of the radial communication hole 45 can be sufficiently secured.
  • the center of the radial communication hole 45 is the position of the step surface 46, and the width dimension, that is, the circumferential dimension of the communication opening 48 is the same as the diameter d. ing.
  • the width dimension of the communication opening 48 becomes smaller than the dimension of the diameter d, and the communication outer peripheral surface 43 of the radial communication hole 45 becomes smaller.
  • the area of the opening is larger than the illustrated form.
  • the width dimension of the communication opening 48 is smaller than the dimension of the diameter d and the radial communication is performed.
  • the area of the opening of the communication outer peripheral surface 43 of the hole 45 is also reduced.
  • the center of the radial direction communication hole 45 when the center of the radial direction communication hole 45 is set to the position of the step surface 46, the width dimension of the communication opening 48 can be maximized, and the flow path area is secured and at the same time the valve body 24 An increase in the axial length can be suppressed.
  • the center of the radial direction communication hole 45 is brought closer to the head 25 side in FIG. 4A, the area of the opening of the communication outer peripheral surface 43 becomes larger and the flow path area can be secured. Since the axial length becomes long and the axial length of the valve body 24 becomes long, the valve body cannot be downsized.
  • the cross-sectional shape of the radial communication hole 45 is not limited to the circular shape described above, but may be an oval or elliptical shape, or may be a rectangular or polygonal shape.
  • the radial communication hole 45 is formed in the valve body 24 such that the major axis faces the radial direction of the valve body 24 and the minor axis faces the axial direction of the valve body 24. Formed.
  • the width dimension of the communication opening 48 can be increased, so that the flow area is increased.
  • the radial communication hole 45 is formed at a position straddling the sliding portion 31 and the flow path forming portion 41 in the axial direction, that is, at a position penetrating the step surface 46 in the axial direction.
  • FIG. 5 (A) is a front view showing a modification of the valve body
  • FIG. 5 (B) is a longitudinal sectional view of FIG. 5 (A).
  • the cross-sectional shape of the radial communication hole 45 of the valve body 24 is a quadrilateral, that is, a rectangle.
  • the rectangular radial communication hole 45 is formed at a position across the sliding portion 31 and the flow path forming portion 41 in the axial direction, as in the above-described embodiment.
  • the valve housing 12 is provided with a bypass portion 51, and a valve mounting hole 52 is formed in the bypass portion 51.
  • a flow path 53 a that connects the guide flow path 42 and the valve mounting hole 52, and a flow path 53 b that connects the flow path 53 a and the first communication hole 21 via the valve mounting hole 52 are formed in the valve housing 12.
  • a bypass flow path 53 that connects the guide flow path 42 and the first communication hole 21 is constituted by both the flow paths 53a and 53b.
  • An opening adjustment valve 54 is provided in the valve mounting hole 52 in order to adjust the opening of the bypass passage 53.
  • the opening adjustment valve 54 has a screw shaft 56 with a needle valve 55 provided at the tip, and a rotation operation portion 57 is provided at the base end of the screw shaft 56.
  • the needle valve 55 moves in the axial direction, and the opening degree of the bypass passage 53 is adjusted.
  • a lock nut 58 is screwed to the screw shaft 56.
  • the bypass flow path 53 can guide the air that has flowed into the pipe 17 attached to the first port 13.
  • FIG. 6 to FIG. 9 show check valves 10a and 10b different from the check valve 10 described above as comparative examples.
  • the same reference numerals are given to members having commonality with the members of the check valve 10 described above.
  • the valve body 24 of the check valve 10 a has an outer end of the radial communication hole 45 opened to the communication outer peripheral surface 43 of the flow path forming portion 41.
  • the guide channel 42 and the radial communication hole 45 are formed on the opening surface along the communication outer peripheral surface 43 while setting the axial length of the valve body 24 to be the same as that of the valve body 24 of the check valve 10 described above.
  • the axial length of the sliding portion 31 needs to be shortened and the width of the sliding portion 31 needs to be reduced. When this dimension is shortened, when the valve body 24 closes the valve seat 23, air leaks from the first communication hole 21 to the second communication hole 22 through the space between the valve seat 23 and the seal member 26.
  • the valve body 24 of the check valve 10b shown in FIGS. 8 and 9 is provided with sliding portions 31a and 31b on both sides in the axial direction of the radial communication hole 45.
  • the sliding portion 31a on the head side is formed with a notch (not shown) for allowing the first communication hole 21 and the radial communication hole 45 to communicate with each other.
  • the valve body 24 is compared with the check valve 10a shown in FIGS. It was possible to prevent the valve body 24 from being inclined during the opening / closing operation.
  • the radial communication hole 45 is formed across the communication outer peripheral surface 43 and the sliding surface 32. Accordingly, the radial communication hole 45 communicates with the guide flow path 42 by both an opening portion opened in the radial direction on the communication outer peripheral surface 43 and an opening portion opened in the axial direction opposite to the guide flow passage 42.
  • the valve body 24 is opened away from the valve seat 23
  • the communication opening degree between the guide channel 42 and the radial communication hole 45 can be increased, and the axial length of the valve body 24 is increased. Therefore, the fluid flow rate when the valve seat is opened can be increased.
  • the axial length of the sliding portion 31 can be increased without increasing the length of the valve body 24.
  • the degree of concentricity is ensured when the valve body 24 moves in the axial direction, and the occurrence of per contact of the valve body 24 with respect to the valve seat 23 is prevented. Thereby, the sealing property of the valve seat 23 when the valve seat 23 is obstruct
  • the valve body 24 is provided with a small-diameter sliding surface 38 away from the sliding surface 32 in the axial direction.
  • the sliding surface 32 slides on the inner surface of the second communication hole 22, and the small diameter sliding surface 38 slides on the inner peripheral surface of the spring receiving member 35. Since these two sliding portions are separated in the axial direction, the inclination of the valve body 24 is further suppressed, and the seal member 26 is further prevented from coming into contact with the valve seat 23 when the valve seat 23 is closed. .
  • a total of four radial communication holes 45 are formed at intervals of 90 degrees in the circumferential direction, but a total of two may be formed at intervals of 180 degrees.
  • the diameter of the axial communication hole 44 is D and the diameter of each radial communication hole 45 is d
  • the diameter d is not necessarily smaller than the diameter D
  • the diameter d is the same as the diameter D. It may be.
  • the check valve 10 is provided in a pneumatic circuit that guides compressed air, and is used to allow the compressed air to flow only in one direction of the flow path.
  • the check valve of the present invention can also be applied.
  • This check valve is applied to a pneumatic system for supplying compressed air from a pneumatic source to a pneumatic actuator.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)
PCT/JP2013/068607 2012-11-21 2013-07-08 逆止弁 WO2014080663A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020157000346A KR101653932B1 (ko) 2012-11-21 2013-07-08 체크 밸브
JP2014548474A JP5981562B2 (ja) 2012-11-21 2013-07-08 逆止弁

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-255380 2012-11-21
JP2012255380 2012-11-21

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WO2014080663A1 true WO2014080663A1 (ja) 2014-05-30

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JP (1) JP5981562B2 (ko)
KR (1) KR101653932B1 (ko)
WO (1) WO2014080663A1 (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9599238B2 (en) 2015-04-03 2017-03-21 Caterpillar Inc. Valve having improved spool geometry
CN109386631A (zh) * 2017-08-08 2019-02-26 株式会社万都 止回阀

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180006648A (ko) * 2016-07-11 2018-01-19 (주)한영 밸브홀더의 연통홀이 곡률진 포핏밸브
KR102381048B1 (ko) * 2021-12-16 2022-04-04 신한정밀 주식회사 역류방지밸브를 구비한 수도 미터기
CN117052331B (zh) * 2023-10-12 2024-01-05 牡丹江通用石油工具有限公司 一种钻具箭形泄压止回阀

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JPS488740Y1 (ko) * 1967-04-12 1973-03-07
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JPS5180724U (ko) * 1974-12-20 1976-06-26
JP2002122088A (ja) * 2000-10-16 2002-04-26 Toyota Industries Corp 真空ポンプにおける流路構造
JP2005351332A (ja) * 2004-06-09 2005-12-22 Nitta Moore Co 逆止弁
JP3136824U (ja) * 2007-08-06 2007-11-08 有限会社ワタリ・システムメカニック 逆止弁

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JPS4869135A (ko) 1971-12-21 1973-09-20
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JPS6348079U (ko) * 1986-09-12 1988-04-01
JPH03136824A (ja) * 1989-10-23 1991-06-11 Hitachi Shonan Denshi Co Ltd モールドねじ抜き金型
JP3136824B2 (ja) * 1993-03-17 2001-02-19 松下電器産業株式会社 Ｐｌｌ回路
JPH116574A (ja) 1997-06-16 1999-01-12 Mikuni Corp チェックバルブ
JP2002022042A (ja) * 2000-07-05 2002-01-23 Seiko Epson Corp 逆止弁及び逆止弁継ぎ手
JP7101066B2 (ja) * 2018-07-10 2022-07-14 日本ペイント・サーフケミカルズ株式会社 クロムフリー金属表面処理剤、金属表面処理方法、及び金属基材

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Publication number Priority date Publication date Assignee Title
JPS488740Y1 (ko) * 1967-04-12 1973-03-07
JPS4869135U (ko) * 1971-12-03 1973-09-01
JPS5180724U (ko) * 1974-12-20 1976-06-26
JP2002122088A (ja) * 2000-10-16 2002-04-26 Toyota Industries Corp 真空ポンプにおける流路構造
JP2005351332A (ja) * 2004-06-09 2005-12-22 Nitta Moore Co 逆止弁
JP3136824U (ja) * 2007-08-06 2007-11-08 有限会社ワタリ・システムメカニック 逆止弁

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9599238B2 (en) 2015-04-03 2017-03-21 Caterpillar Inc. Valve having improved spool geometry
CN109386631A (zh) * 2017-08-08 2019-02-26 株式会社万都 止回阀
CN109386631B (zh) * 2017-08-08 2022-04-01 株式会社万都 止回阀

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JP5981562B2 (ja) 2016-08-31
KR101653932B1 (ko) 2016-09-02
KR20150015043A (ko) 2015-02-09
JPWO2014080663A1 (ja) 2017-01-05

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