WO2005036036A1 - 二方ボール弁 - Google Patents
二方ボール弁 Download PDFInfo
- Publication number
- WO2005036036A1 WO2005036036A1 PCT/JP2004/012541 JP2004012541W WO2005036036A1 WO 2005036036 A1 WO2005036036 A1 WO 2005036036A1 JP 2004012541 W JP2004012541 W JP 2004012541W WO 2005036036 A1 WO2005036036 A1 WO 2005036036A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- primary
- seat ring
- ball
- primary side
- groove
- Prior art date
Links
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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0673—Composite packings
- F16K5/0678—Composite packings in which only one of the components of the composite packing is contacting the plug
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/205—Sealing effected by the flowing medium
Definitions
- the present invention relates to a two-way ball valve provided with a spherical ball plug having a through flow path, and more particularly to a floating type two-way ball valve.
- a two-way ball valve As a valve used for controlling various fluids, for example, controlling a cooling / heating medium for air conditioning, a two-way ball valve is conventionally known.
- This type of two-way ball valve is roughly classified into two types: a floating type, which is rotatably supported by a pair of seat rings, and a trunnion type, which is rotatably supported by a valve shaft. is there.
- the floating type the ball plug is pressed against the secondary seat ring by the primary fluid pressure when fully closed, so sealing is mainly achieved by contact between the ball plug and the secondary seat ring.
- both ends of the valve shaft are rotatably supported by the valve shaft holes provided in the valve body to restrict the movement of the valve shaft. Can not be pressed strongly against the secondary seat ring. For this reason, sealing is usually achieved by contact between the ball plug and the primary seat ring.
- the present invention particularly relates to the former floating type two-way ball valve.
- the first factor is the variation in processing accuracy of parts such as valve bodies, ball plugs, and seat rings. In other words, if the degree of variation in machining accuracy is large, the frictional force between the parts will inevitably increase, and the operating torque of the valve will increase.
- the second factor is that when the valve is fully closed, the primary fluid pressure Is the pressure difference between the pressure in the ball cavity. In other words, when the valve is closed, the flow of fluid is interrupted, so that the primary fluid pressure becomes higher than the pressure in the ball cavity, and the pressure difference causes the ball plug to be pressed against the secondary seat ring. Become. Therefore, all valves must be When switching from the closed state to the open state, a larger operating force is required than when switching the valve from the fully open state to the fully closed state or the intermediate opening.
- the two-way ball valve disclosed in Japanese Patent Application Laid-Open No. 2003-113948 supports a ball valve element incorporated in a valve body rotatably by a pair of seat rings, and each seat ring and an inner wall of the valve body. Are sealed with a ring.
- the ball valve disclosed in Japanese Patent Application Laid-Open No. 11-218240 discloses a fluid introduction space that faces a primary flow path with a ball plug interposed therebetween and communicates with a secondary flow path. It was formed. Therefore, by guiding a part of the primary fluid into the fluid introduction space by the external introduction pipe, it is possible to balance the fluid pressure in the fluid introduction space with the primary fluid pressure. According to such a structure, even if the differential pressure between the primary fluid pressure and the secondary fluid pressure is large or the bore diameter is large, the tonolek required for operation does not increase, and the ball The plug can be operated reliably.
- the two-way ball valve described in Japanese Patent Application Laid-Open No. 2003-113948 is designed to secure a seal by absorbing variations in processing accuracy of component dimensions due to elastic deformation of the O-ring. For this reason, there is an advantage that the first factor (variation in the processing accuracy of the component dimensions) can be eliminated from the two factors that increase the operating torque of the valve without increasing the dimensional accuracy of the components.
- the second factor pressure difference
- the ball valve disclosed in Japanese Patent Application Laid-Open No. 11-218240 can eliminate the second factor because the occurrence of differential pressure is prevented. But for the first factor There was a problem that it could not be handled at all. In addition, since it is necessary to form an L-shaped valve hole in the ball plug, if it is installed in the middle of a straight pipe, the valve casing must be manufactured in a special shape, which increases the manufacturing cost. is there. Furthermore, since it is necessary to provide a fluid introduction space in the valve body, there is also a problem that the valve itself becomes large and heavy.
- the present invention has been made to solve the above-described conventional problems. Therefore, the primary flow path, the secondary flow path, and the space between these two flow paths are provided inside.
- switching of the ball valve to a fully closed state allows the ball valve in the primary side flow path to be closed.
- the pressure difference between the ball plug and the primary seat ring is caused by the differential pressure.
- a gap is formed between the inner circumference of the valve body and the primary seat ring, and the primary fluid is guided into the ball cavity through the gap.
- the fluid that has entered the ball cavity also flows into the ball plug through the primary and secondary openings of the ball plug, and makes the pressure in the ball plug equal to the pressure in the ball cavity. . For this reason, no differential pressure is generated between the primary fluid pressure in the primary flow path and the pressure in the ball cavity and the ball plug, and if no differential pressure is generated, the ball plug is set by the primary fluid pressure.
- FIG. 1 is a cross-sectional view of a two-way ball valve according to a first embodiment of the present invention when it is fully opened.
- FIG. 2 is an enlarged sectional view of a portion A in FIG. 1.
- FIG. 3 is an enlarged sectional view of a portion B in FIG. 1.
- FIG. 4 is a cross-sectional view of a main part showing a modification of the embodiment shown in FIG. 1.
- FIG. 5 is a sectional view of a main part showing a second embodiment of the present invention.
- FIG. 6 is a cross-sectional view of a main part showing a modification of the second embodiment.
- FIG. 7A to 7D are views showing modified examples of the primary side seat ring, respectively.
- 8A and 8B are a cross-sectional view of a seal portion and a diagram showing a communication passage according to a third embodiment of the present invention.
- FIGS. 9A and 9B are diagrams each showing a modification of the third embodiment of the present invention.
- 10A to 10D are views each showing a modified example of the seat ring.
- FIG. 11 is a sectional view of a main part showing a fourth embodiment of the present invention.
- FIG. 12 is a sectional view of a main part showing a fifth embodiment of the present invention.
- a two-way ball valve indicated by reference numeral 1 is a valve body 2 connected in the middle of a pipe 7 (7A, 7B), and is rotatably incorporated in the center of the valve body 2. And a valve shaft 4 as rotating means for rotating the ball plug 3 within an angle range of about 90 °.
- the valve body 2 is composed of two members, an upstream valve body 2A and a downstream valve body 2B, and is formed so as to be open at both ends and upward and have an overall T-shape. And The internal space of the upstream valve body 2A forms a primary (upstream) flow path 5A into which the fluid 40 flows, and a ball cavity 6 into which the ball plug 3 is incorporated. At the center of the upper side of the upstream valve body 2A, a cylindrical portion 14 constituting a mounting portion of the valve shaft 4 is integrally formed so as to protrude upward. The lower end of the cylindrical portion 14 communicates with the ball cavity 6.
- a tapered female screw 16 that is screwed to the tapered male screw of the upstream pipe 7A, and on the inner peripheral surface of the downstream opening 17, A female screw 11 to which the downstream valve body 2B described later is screwed is formed.
- the downstream valve body 2B is formed in a tubular body whose both ends are open, and the internal space forms a secondary (downstream) flow path 5B.
- a male screw 12 is formed on the outer peripheral surface of the upstream opening end 18 of the downstream valve body 2B, and a tapered female screw 20 screwed to the tapered male screw of the downstream pipe 7B is formed on the inner peripheral surface of the downstream opening 19. Is formed.
- the upstream valve body 2A and the downstream valve body 2B are integrally connected by a female screw 11 and a male screw 12 being screwed together, and the connection is sealed by a seal member 13.
- the ball plug 3 is formed in a substantially spherical shape, and has a flow path 23 penetrating in the left-right direction in the figure.
- the ball plug 3 is inserted into the ball cavity 6 of the valve body 2 through the primary and secondary seat rings 24 and 25 and the primary and secondary O-rings (seal members) 26 and 27. It is rotatably assembled.
- the flow path 23 of the ball plug 3 is a linear flow path having a circular cross section passing through the center of the ball plug 3, and the inflow side opening 23 a has a predetermined flow rate characteristic, for example, the cross section of the flow path 23. It is formed by a hole having a substantially triangular shape smaller than the shape.
- the outflow opening 23b of the flow path 23 is formed in a circular shape having the same size as the cross-sectional shape of the flow path 23.
- the portion of the outer peripheral surface of the ball plug 3 where the outflow-side opening 23b of the flow path 23 is open is formed as a flat surface, and the portions where the primary and secondary seat rings 24 and 25 come into contact are spherical surfaces. Form a seat-like seat.
- the primary seat ring 24 and the primary O-ring 26 are formed between the primary flow path 5 A and the ball cavity 6 on the inner peripheral surface of the upstream valve body 2 A.
- Seat ring groove 28 and primary side annular groove 30 respectively.
- the secondary side seat ring 25 and the secondary side ring 27 are opened on the upstream side of the downstream side valve body 2B.
- the seat ring groove 29 and the secondary side annular groove 31 formed on the inner peripheral surface of the mouth end are respectively fitted and inserted.
- the downstream valve body 2B is integrally connected to the upstream valve body 2A by screwing the female screw 11 and the male screw 12 so that the inner peripheral surface of the secondary seat ring 25 is attached to the outer peripheral surface of the ball plug 3.
- the ball plug 3 is pressed against the inner peripheral surface of the primary seat ring 24.
- the seat ring grooves 28 and 29 are formed on both sides of the ball cavity 6, respectively, and communicate with each other via the ball cavity 6. Between the outer peripheral surfaces of the primary and secondary seat rings 24 and 25 and the inner peripheral surface of the valve body 2, in other words, between the wall surfaces 28 a and 29 a of the primary and secondary seat ring grooves 28 and 29, Appropriate gaps G are respectively set.
- the wall surfaces 28a, 29a of the primary and secondary seat ring grooves 28, 29 are cylindrical surfaces around the axis of the valve body 2.
- the primary-side annular groove 30 is located upstream of the primary-side seat ring groove 28 and includes a space (gap G) formed between the primary-side seat ring 24 and the primary-side seat ring 24. ⁇ Ring 26 is stored.
- the inner peripheral wall 32 of the primary annular groove 30 is formed of an annular projection, and is separated from the outer peripheral surface of the ball plug 3.
- a slight gap G is set between the distal end surface of the inner peripheral wall 32 and the primary side surface of the primary seat ring 24, and this primary gap G allows the primary flow path 5A to communicate with the primary annular groove 30. Let me.
- the ball cavity 6 and the primary annular groove 30 communicate with each other via a small gap G formed between the wall surface 28a of the seat ring groove 28 and the outer peripheral surface of the primary seat ring 24.
- the bottom surface 30a of the primary annular groove 30 is a surface intersecting with the axis of the valve body 2, and as shown in FIG. 2, the groove depth gradually increases from the center of the valve body 2 outward in the radial direction. It is formed by an inclined surface as described above.
- the innermost depth of the primary annular groove 30 is set smaller than the wire diameter d of the primary O-ring 26, and the outermost depth is set larger than the wire diameter d of the primary O-ring 26. .
- the primary side O-ring 26 When the two-way ball valve 1 is assembled, the primary side O-ring 26 is located near the inner peripheral wall 32 as shown by a solid line in FIG. It is pressed against the bottom surface 30a. For this reason, the groove portion inside the primary annular ring 26 and the groove portion outside the primary annular ring 30 of the primary annular groove 30 are separated by the primary annular ring 26. Therefore, the primary side ring 26 has the primary fluid pressure P in the primary side flow path 5A and the ball cap. The pressure P in the cavity 6 is constantly applied through the gaps G, G.
- the secondary annular groove 31 is located downstream of the secondary seat ring groove 29 and includes a space (gap G) formed between the secondary annular groove 31 and the secondary seat ring 25. Groove, primary
- the inner peripheral wall 33 of the secondary annular groove 31 is formed of an annular projection and is separated from the outer peripheral surface of the ball plug 3. Further, a slight gap G is set between the distal end surface of the inner peripheral wall 33 and the secondary side surface of the secondary seat ring 25, and this gap G allows the secondary flow path 5B and the secondary side
- the annular groove 31 communicates. Further, the ball cavity 6 and the secondary side annular groove 31 are separated by a small gap G formed between the wall surface 29a of the secondary side seat ring groove 29 and the outer peripheral surface of the secondary side seat ring 25. Communicating with each other.
- the bottom surface 31a of the secondary annular groove 31 is a surface intersecting with the axis of the valve body 2, and as shown in FIG. 3, a force is applied radially outward from the center of the valve body 2 and the groove depth gradually decreases. It is formed by a slope inclined to become deep.
- the innermost depth of the secondary annular groove 31 is set smaller than the wire diameter d of the secondary O-ring 27, and the outermost depth is set larger than the wire diameter d of the secondary O-ring 27. Have been.
- the secondary side O-ring 27 When the two-way ball valve 1 is assembled, the secondary side O-ring 27 is located near the inner peripheral wall 33 as shown by a solid line in FIG. It is pressed against the next seat ring 25. For this reason, a groove portion inside the secondary side annular ring 27 and a groove portion outside the secondary side annular ring 27 of the secondary side annular groove 31 are separated by the secondary side annular ring 27. Accordingly, the secondary fluid pressure P in the secondary flow path 5B and the ball cavities are attached to the secondary O-ring 27.
- the pressure P in the tee 6 is constantly adjusted through the gaps G, G.
- valve shaft 4 is rotatably inserted into the cylindrical portion 14 of the upstream valve body 2 A via an O-ring 36.
- the upper end of the valve shaft 4 protrudes above the cylindrical portion 14, and is connected to a drive device (not shown) such as a drive motor or a pneumatic actuator, or a handle for manual operation is attached.
- a drive device such as a drive motor or a pneumatic actuator, or a handle for manual operation is attached.
- the lower end 4a of the valve shaft 4 is fitted in a square hole 35 formed in the center of the upper surface of the ball plug 3 in a state where rotation is restricted.
- the maximum rotation angle of the valve shaft 4 is approximately 90 °.
- FIG. 1 shows the two-way ball valve 1 in a fully opened state.
- the axis of the valve body 2 is The axis of the flow path 23 of the ball plug 3 is aligned, and the primary flow path 5A and the secondary flow path 5B communicate with each other via the flow path 23. Therefore, the fluid 40 supplied to the upstream pipe 7A flows to the downstream pipe 7B through the primary flow path 5A, the flow path 23, and the secondary flow path 5B of the two-way ball valve 1.
- the primary side O-ring 26 seals the primary side annular groove 30 by being held at the position shown by the solid line in FIG. Therefore, the fluid 40 in the primary flow path 5A flows through the gap G——the secondary annular groove 30—the gap G—the primary seat ring groove 28 and
- the ring 26 is elastically deformed in the radially expanding direction by its primary fluid pressure P, and is shown by the two-dot chain line in Fig. 2.
- the force required to operate the two-way ball valve 1 when opening the valve from the fully closed state where it cannot be pressed strongly can be reduced.
- the torque required for operation becomes smaller, the primary side
- the primary O-ring 26 is connected to the primary fluid pressure P and the ball cap.
- the secondary seat ring 25 and the inner peripheral wall 33 are compressed and deformed in the small diameter direction by P.
- the valve body 2 since the primary and secondary annular grooves 30, 31 are sealed by compression of the primary and secondary O-rings 26, 27, respectively, the valve body 2, the ball plug 3, the primary, High dimensional accuracy is not required for components such as the secondary side seat rings 24 and 25, making it easy to manufacture these components and preventing an increase in tonnolek required for operation due to variations in dimensional accuracy of the components. Therefore, the point force can smoothly and reliably operate the ball plug 3 with a small operation force.
- the secondary side seat ring 25 the secondary side ring 27 and the secondary side annular groove 31 are also connected to the primary side seat ring 24, the primary side ring 26 and the primary side ring 26.
- the secondary valve moves toward the outer periphery of the secondary annular groove 31, and is released from the state in which the downstream valve body 2B is pressed against the secondary seat ring 25.
- a gap G is created between the secondary O-ring 27 and the bottom surface 31a of the secondary annular groove 31.
- the primary seat ring is released by the secondary fluid pressure P.
- Fluid pressure P on the secondary side increases, or the flow direction of fluid 40 changes due to backflow.
- the ball plug 3 can be operated smoothly and reliably with a small operation force.
- the secondary side ring 27 is connected to the secondary side fluid pressure P and the fluid pressure P in the ball cavity 6.
- FIG. 4 is a cross-sectional view of a main part showing a modification of the embodiment shown in FIG.
- the bottom surface 30a of the primary annular groove 30 formed in the valve body 2 is formed on a surface perpendicular to the axis of the valve body 2, and the primary seat ring 24 faces the primary annular groove 30.
- 24a is formed as a tapered surface inclined from the inner periphery toward the outer periphery.
- FIG. 5 is a sectional view of a main part showing a second embodiment of the present invention.
- a communication path 42 for communicating the ball cavity 6 with the primary annular groove 30 is formed on the outer peripheral surface of the primary seat ring 24. You. When the valve is switched to the fully closed state, when the primary O-ring 26 is elastically deformed in the radially expanding direction by the primary fluid pressure P as shown in FIG. 5 and hits the outer peripheral surface of the primary annular groove 30.
- the gap G between the outer peripheral surface of the primary seat ring 24 and the wall surface 28a of the primary seat ring groove 28 is closed.
- the depth of the communication passage 42 is set so that the primary side ring 26 does not completely block the communication passage 42, the primary fluid in the primary side flow passage 5A is transferred to the primary side annular groove 30— Passageway 42—can be guided into ball cavity 6 and ball plug 3 through groove 28 for the next seat ring.
- the primary side annular groove 30 is not limited to the one in which the groove depth increases from the inner peripheral side toward the outer peripheral side as shown in FIG. 5, but the one having a uniform depth as shown in FIG. There may be.
- FIGS. 7A to 7D are views showing various forms of the communication path 42 provided in the primary seat ring 24.
- FIG. 7A and 7B show an example in which the required number of grooves formed on the outer periphery of the primary seat ring 24 are used as the communication passage 42.
- the shape of the groove is not limited to a rectangle and a semicircle, but can be various shapes.
- FIG. 7C shows an example in which a required number of through holes formed in the primary seat ring 24 and penetrating in the thickness direction are used as the communication paths 42.
- FIG. 7D shows an example in which a required number of notches formed on the outer periphery of the primary seat ring 24 are used as the communication passage 42.
- the fluid pressure P in the primary side and the fluid pressure P in the ball cavity 6 and the ball plug 3 can be rapidly increased by guiding the ball cavity 6 and the ball plug 3 through the communication passage 42.
- a communication passage 50 is formed on the valve body 2 side, and the communication passage 50 allows the ball cavity 6 and the seat ring groove 2 to be formed. 8 and the primary side annular groove 30 are communicated with each other.
- the communication passage 50 is formed in the inner peripheral surface of the valve body 2 at a portion corresponding to the primary side seat ring groove 28 and the primary side annular groove 30. It is composed of a groove with a circular cross section.
- FIG. 9A shows a passage forming member having a communication passage 52 for communicating the primary seating groove 28 and the primary annular groove 30 to a portion corresponding to the primary annular groove 30 on the inner peripheral surface of the valve body 2. 51 are arranged.
- FIG. 9B shows the primary seat ring groove 28 and the primary annular groove 30 communicating with the portion corresponding to the primary seat ring groove 28 and the primary annular groove 30 on the inner peripheral surface of the valve body 2.
- Communication passage 5
- FIGS. 10A and 10D are views showing various forms of the passage forming member 51 shown in FIGS. 9A and 9B. That is, FIG. 10A shows a ring shape in which the passage forming member 51 is partially cut open.
- FIG. 10B shows a structure in which the passage forming member 51 is formed in a cylindrical shape having no open portion, and a plurality of grooves (recesses) formed on the inner peripheral surface thereof are used as the communication passage 52. is there.
- FIG. 10C shows a case where the passage forming member 51 is formed in a cylindrical shape having no open portion, and the inner and outer peripheries thereof are formed.
- V-shaped irregularities are formed alternately and continuously, and the irregularities on the outer peripheral side are used as communication paths 52.
- a spirally wound wire is used as the passage forming member 51, and a gap between adjacent coils is used as the communication passage 52.
- FIG. 11 is a sectional view of a main part showing a fourth embodiment of the present invention.
- the inner peripheral surface of the valve body 2 includes a ring-shaped protrusion that restricts the movement of the primary seat ring 24 to the downstream side at the boundary between the ball cavity 6 and the seat ring groove 28.
- the restricting part 60 is integrally provided.
- the seat ring 24 is pressed to move to the downstream side. At this time, the primary seat ring 24 is pressed against the movement restricting portion 60. On the other hand, the ball plug 3 moves downstream. Away from the primary seat ring 24. Therefore, a gap G is formed between the outer peripheral surface of the ball plug 3 and the inner peripheral surface of the primary seat ring 24, and the gap G
- the body pressure P and the pressure P in the ball cavity 6 and ball plug 3 can be equalized.
- FIG. 12 is a sectional view of a main part showing a fifth embodiment of the present invention.
- a primary side seat ring 61 that is elastically deformable in the axial direction of the valve body 2 is mounted in a seat ring groove 28 formed on the inner peripheral surface of the valve body 2.
- the primary seat ring 61 is formed by butt-welding the inner peripheral edges of two frusto-conical rings 61a and 61b formed of a metal plate, facing each other. For this reason, the primary seat ring 61 has a V-shaped groove 62 on the outer periphery, and is formed so as to be elastically deformable in the axial direction of the valve body 2.
- the ring 6 la of the tring 61 is elastically deformed to the secondary side as shown by the two-dot chain line. For this reason, the outer peripheral edge of the ring 61a is separated from the side wall 28b of the primary seat ring groove 28, and the primary channel 5A and the ball cavity 6 are communicated through the primary seat ring groove 28. Therefore, part of the fluid in the primary flow path 5A flows into the ball cavities 6 and the ball plugs 3 through the primary seat ring grooves 28, and the pressure in the ball cavities 6 and the ball plugs 3 is reduced. Make P equal to the primary fluid pressure P. Therefore, even in such a structure, As in the first to fourth embodiments shown in FIGS. 1, 5, 8, and 11, the tonnolek required for the operation of switching the two-way ball valve from the fully closed state to the open state can be reduced.
- the primary seat ring groove 28 is sealed by the primary seat ring 61 which can be elastically deformed in the axial direction of the valve body 2, so that the radial direction shown in FIG. O-rings 26 and 27 that elastically deform are not required, and the number of parts can be reduced. Furthermore, if the O-rings 26 and 27 are not required, there is no need to form the primary and secondary annular grooves 30 and 31 in the valve body 2. However, there is an advantage that it can be manufactured easily and easily.
- the cross section of the primary seat ring 61 is not limited to the V-shape, but may be a U-shape.
- the second to fifth embodiments have been described with reference to FIGS. 4 to 12 as the primary side seal structure.
- the secondary side seal structure has the same structure as that of the primary side. It is desirable to keep it. In this case, even when the fluid pressure on the secondary side is higher than that on the primary side or when the flow direction of the fluid changes due to backflow, the force S required to open the valve can be reduced.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003351756A JP2005114116A (ja) | 2003-10-10 | 2003-10-10 | 二方ボール弁 |
JP2003-351756 | 2003-10-10 |
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WO2005036036A1 true WO2005036036A1 (ja) | 2005-04-21 |
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PCT/JP2004/012541 WO2005036036A1 (ja) | 2003-10-10 | 2004-08-31 | 二方ボール弁 |
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WO (1) | WO2005036036A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011174443A (ja) * | 2010-02-25 | 2011-09-08 | Zama Japan Co Ltd | 回転絞り弁式気化器における弁軸の防塵シール構造 |
EP2696121A1 (en) * | 2012-08-08 | 2014-02-12 | Genebre Group, S.L. | Shutoff valve with anti freeze system |
US20160319940A1 (en) * | 2014-10-28 | 2016-11-03 | Kitz Corporation | Trunnion-type ball valve |
US11162595B2 (en) | 2016-02-18 | 2021-11-02 | Gasket International S.R.L. | Sealing assembly for ball valves and ball valve comprising such a sealing assembly |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5455843B2 (ja) * | 2010-08-24 | 2014-03-26 | イーグル工業株式会社 | 三方弁 |
CN109084022B (zh) * | 2018-09-21 | 2021-03-23 | 上海沪东造船阀门有限公司 | 一种超低温球阀密封圈 |
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---|---|---|---|---|
JP2011174443A (ja) * | 2010-02-25 | 2011-09-08 | Zama Japan Co Ltd | 回転絞り弁式気化器における弁軸の防塵シール構造 |
EP2696121A1 (en) * | 2012-08-08 | 2014-02-12 | Genebre Group, S.L. | Shutoff valve with anti freeze system |
US20160319940A1 (en) * | 2014-10-28 | 2016-11-03 | Kitz Corporation | Trunnion-type ball valve |
US10018276B2 (en) * | 2014-10-28 | 2018-07-10 | Kitz Corporation | Trunnion-type ball valve |
US11162595B2 (en) | 2016-02-18 | 2021-11-02 | Gasket International S.R.L. | Sealing assembly for ball valves and ball valve comprising such a sealing assembly |
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JP2005114116A (ja) | 2005-04-28 |
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