JP2012002355A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve configured to secure high sealing property and operability in opening/closing a valve element, having excellent economic efficiency while improving the durability with a simple structure, and minimizing loss during inflow/outflow of a fluid.SOLUTION: In the rotary valve, a valve element housing section 13 having an inner circumferential hemispherical surface 12 and a cylindrical opening portion 14 opened from the housing section 13 are formed within a body 2 having at least two outflow and inflow ports 10, 11, and a valve element 3 is installed in the housing section 13 through the opening portion 14. A circular outer peripheral portion 21 to be provided in the upper section of the valve element 3 is provided rotatably inside the cylindrical opening portion 14 through a seal material 22. The cylindrical opening portion 14 is covered with a lid member 4. The valve element 3 includes a through opening 24 communicating with the outflow and inflow ports 10, 11, and an installation groove 25 formed in a direction crossing the through opening 24 so as to face the outflow and inflow openings 10, 11. A seal member 5 is attached to the installation groove 25 to close the outflow and inflow ports 10, 11.

Description

  The present invention relates to a rotary valve that reduces operating torque during valve body operation while ensuring sealing performance when a flow path is opened and closed, and particularly relates to a rotary valve suitable for manual operation.

  Conventionally, ball valves, globe valves, butterfly valves, gate valves, and the like are generally used as valves for opening and closing channels. Among these, the ball valve has a structure with no obstacles to the flow when fully opened because the flow path is formed by a circular through hole provided in the valve body, compared to the globe valve and the butterfly valve Since the pressure loss is small and the stroke of the stem is not required unlike a gate valve, it is possible to make it compact. In addition, there is a cock used for opening and closing the flow path. This cock is generally housed in a metal body in which a convex conical metal valve body is processed into a concave conical shape, and the valve body is rotated. Since the fluid is sealed by the metal sealing part that opposes by movement, it is necessary to improve the processing accuracy of the sealing surface such as taper processing, lapping between the valve body and body, and processing such as grease application. There is.

  As described above, since the ball valve has many advantages over other types of valves and cocks, it is often used as a flow path opening / closing valve. Usually, a ball valve includes a spherical valve body and a ring-shaped seat member, and the seat member is mounted on the primary and secondary sides of the valve body flow path so as to be orthogonal to the flow path. Both sides of the sheet member are sandwiched so that they cannot rotate in the mounting direction. The ball valve is operated to open and close so that the flow path and the spherical surface provided in the valve body are alternately opposed to the seat member by rotating the stem connected to the valve body 90 degrees with the handle. When the member is compressed by the pressing force of the valve body, the sealing performance is secured by the surface pressure.

On the other hand, Patent Document 1 is a ball valve including a case having a hemispherical hollow space, a plug, and a seal member. The plug is integrally formed by a hemispherical valve body and a valve shaft, and the hollow / hemispheric space of the case is formed. It can be rotated around the valve shaft. A concave portion is formed in the hemispherical valve body of the plug, and a seal member is fitted into the concave portion.
The ball valve of Patent Document 2 includes a valve box, a hemispherical valve body integrated with a stem, and a seal member that seals the sliding surface of the valve body so as to tightly cover the valve body. A seal member is attached to the valve member, and a valve body is attached to the seal member. This ball valve has a structure in which the entire outer periphery of the valve body is sealed by a seal member.

  Further, the above-described ball valve is classified into a floating type and a trunnion type. Patent Documents 1 and 2 described above are floating type ball valves, and this ball valve has a structure in which a valve body is supported by a seal member and pressed against a secondary side seat member by a differential pressure when fully closed. It has become. On the other hand, a trunnion type ball valve has a structure in which a ball valve body is supported by a stem and a trunnion (lower stem).

JP-A-9-79391 German Utility Model Registration No. 9408156

However, in order to ensure operability and sealing performance in the ball valve, first, it is necessary to assemble so that the contact pressure between the secondary side seat member and the valve body is equal. It is necessary to process and assemble a sealing surface such as a seal side surface of a member, a spherical surface of a valve body, and a mounting portion on a body side on which these are mounted with high accuracy. In this case, in the ball valve, since the contact area between the seat member and the valve body changes during the rotation of the valve body, the operation torque is likely to be uneven, and it is difficult to ensure stable operability. There is a need.
Further, after installation, the seat member is always attached with a strong pressure facing the primary and secondary sides, and thus is easily worn. In particular, in the floating ball valve, the valve body is on one side (secondary) due to fluid pressure. The secondary side) is a structure that intensively press-seals the sheet member, so that the increased wear increases the uneven wear of the sheet member, resulting in poor durability of the sheet member and requiring replacement. There are also poor economics. On the other hand, the trunnion type ball valve has a structure that prevents the movement of the valve body by the lower stem and reduces the wear of the seat member. However, the complicated internal structure has led to an increase in cost. In addition, these ball valves have a problem that the number of parts increases, the processing accuracy must be improved, and the number of assembly steps increases.

  When fluid flows, when these ball valves are slightly opened, fluid resistance increases on the inflow / outflow side, and cavitation tends to occur. At this time, after the fluid passes through the minute opening of the primary side valve body and the seat member, the fluid passes through the large volume body cavity and the communication hole of the valve body, and the secondary side valve body and the seat member Therefore, the orifice portion is formed in two stages and the energy loss increases. Furthermore, at the time of half-opening, since the cavity volume is large, the loss coefficient when the fluid flows increases, and the flow resistance also increases. When fully opened, the temperature rise of the sealing fluid staying in the large volume cavity causes an abnormal pressure increase, and there is a problem that the sheet member is damaged or deformed to cause leakage or malfunction.

In the ball valve of Patent Document 1, since the hemispherical valve body is attached so as to be fitted in the hemispherical hollow hemispherical space, the pressure contact force of the seal member becomes strong like the above-described ball valve, and the seal member The durability was as bad as the ball valve.
Since the ball valve of the literature 2 is structured to seal the entire outer periphery of the valve body with a large seal member installed in the cavity of the valve box, the entire seal member is replaced when the seal member is worn. The need to do so has deteriorated the economy.

  The present invention has been developed in order to solve the above-mentioned problems, and the object of the present invention is a rotary valve that ensures high sealing performance and operability when opening and closing the valve body, and has a simple structure. An object of the present invention is to provide a rotary valve that is excellent in economy while improving durability, and that minimizes a loss at the inflow and outflow of fluid.

  In order to achieve the above object, the invention according to claim 1 includes a body having at least two outflow inlets, and a valve body housing portion having an inner peripheral hemispherical surface and a cylindrical opening portion opened from the valve body housing portion. The valve body is inserted into the valve body storage portion from the cylindrical opening, the circular outer periphery provided above the valve body is rotatably provided in the cylindrical opening via a sealing material, and the cylindrical opening is provided. The valve is covered with a lid member, and the valve body is formed with a through-hole communicating with the outflow inlet and a mounting groove facing the outflow inlet in a direction intersecting the through-opening, and the outflow inlet is closed in the mounting groove. This is a rotary valve equipped with a sealing member.

  The invention according to claim 2 is the rotary valve in which the outer peripheral surface of the valve body is a hemispherical portion, and the circular outer peripheral portion is integrally formed on the upper portion of the hemispherical portion.

  In the invention according to claim 3, the lid member is screwed into the cylindrical opening, and the male threaded portion of the cylindrical portion provided on the lid member is formed on the inner circumferential surface of the circular outer peripheral portion of the valve body. Screwed together to provide a gap between the valve body storage part and the valve body, and the rotary operation part is provided so that the valve body can be moved up and down through the O-ring and can be freely rotated. Is a rotary valve hermetically sealed.

  In the invention according to claim 4, the lid member is screwed into the cylindrical opening and provided in the cylindrical hole through which the rotation operation portion of the lid member passes, so that the screw portion has a circular outer peripheral portion of the rotation operation portion of the valve body. The formed male screw part is screwed together to provide a gap between the valve element storage part and the valve element, and the valve element can be moved up and down via the O-ring at the rotation operation part, and can be rotated and closed. It is a rotary valve that sometimes seals the inlet and outlet with a sealing member.

  According to the fifth aspect of the present invention, the valve body storage portion stores the hemispherical valve body, and the circular outer peripheral portion is rotatably provided in the cylindrical opening via the O-ring, and the lid member is screwed. In this rotary valve, the sealing member of the valve body is tightened.

  The invention according to claim 6 is the rotary valve in which the mounting groove is a circular concave groove, and a disc-like elastic seal member is mounted on the circular concave groove.

  The invention according to claim 7 is the rotary valve in which the annular convex portion is provided on one of the opposing surfaces of the circular concave groove or the opposing surface of the seal member mounted in the circular concave groove.

  According to an eighth aspect of the present invention, a metal sheet unit capable of hermetically sealing the outflow inlet is fixed to the mounting groove, and the metal sheet unit is a metal sheet that is a seal member to which a guide member is attached via a disc spring and the metal. A holder that is mounted in the mounting groove while holding the sheet, and the spherical contact between the two spheres mounted between the holder and the guide member causes the metal sheet to be centered on the holder and the holder center. The rotary valve is provided so as to be rotatable and tiltable.

  According to the ninth aspect of the present invention, a handle provided in the rotation operation portion is formed by forming notch locking portions on the circular outer peripheral portion at approximately 90 ° intervals, and locking the ball plunger screwed from the side of the body into the notch locking portion. Is a rotary valve that can be rotated about every 90 °.

  In the invention according to claim 10, when the rotary valve is used for a multi-way valve such as a saddle type three-way valve, a horizontal three-way valve or a horizontal four-way valve, the flow path of the multi-way valve inlet / outlet with at least one seal member attached to the valve body itself. Is a rotary valve provided so as to be appropriately switchable.

According to the first aspect of the present invention, the pressure loss is smaller than that of a globe valve, a butterfly valve, etc., and a compact design can be achieved without requiring a stem stroke unlike a gate valve. As described above, the operability and the sealing performance can be ensured without processing the sealing surfaces such as the valve body and the sealing member with high accuracy. By suppressing wear of the sealing member, durability can be improved and high sealing performance can be maintained. In addition, since it has a simple structure and a small number of parts, it is excellent in economic efficiency, and maintenance such as assembly and replacement of seal members is easy.
When flowing the fluid, the energy loss at the minute opening can be minimized while suppressing the cavitation at the minute opening, and the flow coefficient can be reduced by reducing the loss coefficient at the inlet / outlet at the full opening. Furthermore, since the abnormal pressure increase value can be kept low due to the small cavitation volume, the occurrence of leakage and malfunction can be avoided. In this way, the function as a valve can be enhanced by minimizing the loss at the time of fluid inflow / outflow, and it becomes possible to flow the fluid with a smooth operation compared to the ball valve. From these facts, it is possible to provide a rotary valve that incorporates advantages such as a ball valve and a cock while eliminating the disadvantages of the ball valve.

  According to the second aspect of the present invention, the top entry type that allows the valve body to be mounted on the body from the upper side reduces the number of parts, while reducing the size and weight with a simple structure, and sealing from above the body. Assembly is also facilitated by inserting a valve body equipped with a member. In addition, by inserting a valve body having a circular outer peripheral part at the top of the hemispherical part, it is possible to improve the mounting accuracy of the through hole / seal member and the outflow inlet without requiring high dimensional accuracy. External leakage can be suppressed by the one-piece body. There is no need to incorporate a seat member from the piping connection port, and the valve body can be easily replaced without removing the valve body from the piping.

  According to the third or fourth aspect of the invention, when the valve body is rotated via the rotation operation section, the valve body storage section is rotated while the valve body is rotated by screwing between the male screw section and the female thread section. The inside of the hemispherical portion can be moved up and down. In this case, when the rotation operation unit is rotated in the valve closing direction, the sealing member is crimped by rotating the valve body in the valve closing direction while the valve body is lowered to improve the sealing performance, and the rotation operation unit is set in the valve open state. When it is rotated, the pressure of the seal member is weakened by rotating in the valve opening direction while the valve body is raised, so that wear of the seal member can be suppressed. With this structure, it is possible to easily finely adjust the seal surface pressure by the seal member from the outside through the lid member at the pitch of the external thread portion and the internal thread portion. In addition, the durability of the seal member can be increased and the durability can be improved, and the operability can be improved by reducing the operating torque by suppressing the sliding resistance during the operation. In addition, since the thrust force received by the valve body during operation due to the pressure bonding of the seal member and the thrust force due to the fluid pressure are converted to the rotational force of the valve body by screws, the operation torque can be further reduced.

  According to the fifth aspect of the present invention, when the sealing member is worn due to repeated rotation of the valve body, the sealing performance can be recovered by tightening the sealing member by screwing the lid member. For this reason, it is also possible to use the same seal member for a long time while not replacing the seal member. At the time of assembly, the sealing performance and operating torque during valve body opening / closing operation can be adjusted by rotating the lid member to increase or decrease the pressure-bonding force of the sealing member. The seal member can be installed in an optimal state.

  According to the invention of claim 6, the sealing member can be easily removed from the valve body and replaced, and when the valve is closed, this disk-like elastic sealing member can block the flow path of the outflow inlet and exhibit high sealing performance. . In addition, since the seal member can be formed to the minimum size, the material used for the seal member can be reduced.

  According to the seventh aspect of the invention, the pressure contact force between the opposing surfaces of the circular concave groove and the seal member is increased, so that the pressure contact prevents the fluid from entering the back side of the seal member and the sneak in, and the seal member is caused by the fluid pressure. It can be prevented from being deformed, protruding or damaged. By increasing the pressure contact force between the circular concave groove and the seal member, the sealing surface pressure of the seal portion is increased, and the sealing performance can be further improved by uniformly applying the seal surface pressure to the seal member. This annular convex portion can be appropriately provided on either the valve body or the seal member as necessary.

  According to the eighth aspect of the invention, the valve body can be rotated while the metal sheet follows the rotation and vertical movement of the valve body, and the centering operation is performed when contacting the concave spherical surface of the valve body storage portion in the body. By ensuring the contact of the sealing surface, the deviation between the sealing surface of the metal sheet and the outflow inlet due to the rotation of the valve body is absorbed, and the fluid is reliably ensured by a uniform sealing state that prevents these local contacts. Can be sealed.

  According to the ninth aspect of the present invention, when the handle is operated, the ball plunger is locked to the notch locking portion so that the handle can be rotated at an angle of about 90 °, and the valve can be operated easily and accurately until the valve is opened or closed. it can. Since a click feeling is obtained when the plunger is locked to the notch locking portion, the rotation state of the valve body can be easily confirmed. For this reason, it is possible to prevent wear of the seal member due to excessive rotation of the valve body and maintain excellent operability and sealability over a long period of time. Furthermore, by changing the angle of the interval between the notch locking portions, the valve body can be easily rotated to a predetermined angle without changing the shape of the entire body or the valve body.

  According to the tenth aspect of the present invention, a plurality of flow paths can be closed with a single seal member, and the flow path of the multi-way valve inlet / outlet can be appropriately switched. A multi-way valve such as a valve, a horizontal three-way valve or a horizontal four-way valve can be configured. Since only one seat member is required, the assemblability is excellent, and the seat member can be easily replaced without removing the entire valve from the piping.

It is sectional drawing which showed 1st Embodiment of the rotary valve in this invention. (A) is AA sectional drawing of FIG. (B) is the schematic diagram which showed the relationship between the support stem in FIG. 1, and a stopper. It is sectional drawing which showed the valve open state of the rotary valve of FIG. (A) is BB sectional drawing of FIG. (B) is the schematic diagram which showed the relationship between the support stem in FIG. 3, and a stopper. (A) is principal part sectional drawing which showed the other mounting state of the sealing member. (B) is a longitudinal cross-sectional view of a sealing member. (C) is the longitudinal cross-sectional view which showed the sealing member of the other example. It is sectional drawing which showed 2nd Embodiment of the rotary valve in this invention. It is sectional drawing which showed the valve open state of the rotary valve of FIG. It is sectional drawing which showed 3rd Embodiment of the rotary valve in this invention. It is sectional drawing which showed 4th Embodiment of the rotary valve in this invention. It is the longitudinal cross-sectional view which showed the metal seal unit. It is sectional drawing which showed 5th Embodiment of the rotary valve in this invention. It is the schematic sectional drawing which showed the other example of the multi-way valve. It is sectional drawing which showed 6th Embodiment of the rotary valve in this invention.

Hereinafter, embodiments of a rotary valve in the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of a rotary valve according to the present invention.
A rotary valve main body (hereinafter referred to as a valve main body) 1 of the present invention includes a body 2, a valve body 3, a lid member 4, a seal member 5, and a rotation operation unit 6.

  As shown in FIGS. 1 and 3, the body 2 of the valve body 1 is formed in a one-piece structure and has at least two outflow inlets including an outflow port 10 and an inflow port 11. Are formed with a valve body storage portion 13 having an inner circumferential hemispherical surface 12 and a cylindrical opening portion 14 opened more than the valve body storage portion 13. The inner peripheral hemispherical surface 12 is provided in a substantially hemispherical concave shape by a substantially hemispherical spot facing. Further, an insertion hole 15 is formed at the bottom of the valve body storage portion 13, and a female screw 16 is formed at the inner peripheral surface of the cylindrical opening 14. The outflow inlets 10 and 11 are formed so as to communicate with the valve body storage portion 13, and a screwing portion 17 that is a female screw is formed on the inner peripheral side of the outflow inlets 10 and 11, and the screwing portion 17 is not illustrated. The pipe can be connected. A pin-shaped stopper 18 is fitted and fixed in the insertion hole 15, and the rotation of the valve body 3 can be restricted by this stopper 18.

  The valve body 3 has a semispherical portion 20 formed in a substantially hemispherical shape in part, and has a substantially cylindrical circular outer peripheral portion 21 above the hemispherical portion 20. In the present embodiment, the outer peripheral surface of the valve body 3 is a hemispherical portion 20, and a circular outer peripheral portion 21 is formed on the hemispherical portion 20. The circular outer peripheral portion 21 is mounted to face the body cylindrical portion 14 a formed inside the cylindrical opening 14 of the body 2. When an excessive fluid pressure is applied to the valve body 3, the circular outer peripheral portion 21 comes into contact with the body cylindrical portion 14a, and the movement of the valve body 3 is restricted. A sealing material 22 made of an O-ring is mounted on the outer peripheral side of the circular outer peripheral portion 21, and a female screw portion 23 is formed on the inner peripheral surface of the circular outer peripheral portion 21. On the outer peripheral surface of the hemispherical portion 20, a through-hole 24 that communicates with the outlet 10 and the inlet 11 and a mounting groove 25 that faces the outlet in the direction intersecting with the through-hole 24 are formed. An elastic seal member 5 capable of closing the outflow inlets 10 and 11 is detachably mounted in the mounting groove 25. In the present embodiment, the mounting groove 25 is a circular groove, and the seal member 5 is formed in a disk shape that can be fitted into the circular groove 25.

  Furthermore, a concave fitting groove 27 having two parallel surfaces is formed on the upper surface side of the valve body 3, and the rotation operation portion 6 can be attached to the fitting groove 27. On the other hand, a support stem 28 that can be inserted into the insertion hole 15 is formed integrally with the lower portion of the valve body 3. The support stem 28 is formed with a notch surface 29 substantially parallel to the rotation axis P of the valve body 3. The support stem 28 is a component that is arranged as necessary, such as a valve body rotation restriction described later.

  The valve body 3 has a shape that can be inserted into the inner peripheral hemispherical surface 12, and corresponds to the hemispherical portion 20 if the through hole and the seal member can be mounted corresponding to the outflow inlets 10 and 11. The portion may have a shape other than the hemispherical portion. When the hemispherical portion 20 is formed in a part of the valve body 3 as in the present embodiment, the hemispherical portion 20 is guided by the inner peripheral hemispherical surface 12 in the body 2. The backlash of 3 is reduced and the rotation is smooth.

  The seal member 5 attached to the valve body 3 is formed of, for example, a polymer material such as PTFE (polytetrafluoroethylene). The seal member 5 is integrated with the valve body 3 when the valve body 3 is rotated. The outlet 10 and the inlet 11 can be sealed by rotating around the rotation axis P. On the other hand, when they are displaced from the outlet 10 and the inlet 11, they are opened.

  The inclination angle α of the seal member 5 is preferably set to 25 to 35 °, more preferably 30 °. If the inclination angle α is too small, the seal member 5 becomes close to an upright state, and a sufficient height of the circular outer peripheral portion 21 cannot be secured. To eliminate this, the height of the valve body 3 must be increased. Don't be. On the other hand, if the inclination angle α is increased too much, the seal member 5 becomes almost horizontal, and a large outer shape must be secured to seal the outflow inlets 10 and 11, and the valve body to which the seal member 5 is attached is also provided. A big thing is needed.

  The lid member 4 is formed in a bush shape, and has an annular attachment portion 30 and a cylindrical portion 31 having a diameter smaller than that of the attachment portion 30. A male screw 32 that can be screwed to the female screw 16 of the cylindrical opening 14 is formed on the outer peripheral side of the mounting portion 30, while a male screw portion 33 that can be screwed to the female screw portion 23 is formed on the outer peripheral side of the cylindrical portion 31. Is provided. A through hole 34 is formed in the center of the lid member 4, and the rotation operation unit 6 can be attached to the valve body 3 through the through hole 34.

  The rotation operation part 6 has a stem part 35 and a handle 36 for manual operation. A parallel two-face part 37 that can be fitted in the fitting groove 27 of the valve body 3 is formed at the lower end part of the stem part 35. Yes. By attaching the rotation operation unit 6 to the valve body 3, it is possible to perform fluid control by opening and closing the valve body 3 via the handle 36.

The case where the valve body 1 is assembled by the above-described parts will be described. In this embodiment, the case where the valve body 3 is assembled in the fully opened state with respect to the outflow inlets 10 and 11 of the body 2 will be described. However, the valve body 3 is assembled in the fully closed state with respect to the outflow inlets 10 and 11. You may do it.
First, the sealing member 22 and the sealing member 5 are mounted on the valve body 3, and the valve body 3 is fully opened with respect to the outflow inlets 10 and 11 of the body 2 in the valve body housing portion 13 of the inner circumferential hemispherical surface 12. The support stem 28 is inserted into the insertion hole 15. At this time, the seal member 5 and the body 2 are in a contact state where no pressing force is applied. Next, the male thread 16 of the lid member 4 is screwed onto the male thread 16 of the cylindrical opening 14 while the valve body 3 is kept fully open, and the male thread 33 of the lid member 4 is threaded to the female thread of the valve body. The cylindrical opening 14 is covered with the lid member 4 while being screwed to the portion 33. In this case, the valve body 3 can be mounted while being pressed against the body 2 by the lid member 4, the circular outer peripheral portion 21 is mounted in the cylindrical opening 14 via the sealing material 22, and the valve body is rotated by the rotation operation unit 6. 3 is rotatably provided.

  After the valve body 3 is mounted, a gap G is provided between the valve body storage portion 13 and the valve body 3 of the hemispherical portion 20, and the valve body 3 is moved up and down via the O-ring 22 by the rotation operation portion 6. The valve body 3 can be provided so as to be movable and rotatable. When the valve body 3 is closed, the outflow inlets 10 and 11 are hermetically sealed by the seal member 5 attached to the valve body 3.

As shown in FIGS. 1 and 3, the gap G includes a gap G ₁ and a gap G _{2. The} gap G ₁ lowers the position of the valve body 3 relative to the body 2 when the valve body 1 is fully closed. A gap is provided to press the seal member 5 against the opening portions (body valve seats) of the outflow inlets 10 and 11. This gap G ₁ is formed between the valve body accommodating portion 13 and the hemispherical portion 20, the case of a 90 ° opening and closing valves, to ensure a more 1/4 pitch of the thread used for the vertical movement of the valve body 3 . In the present embodiment, spaces K ₁ and K ₂ are provided between the valve body 3 and the lid member 4 as a precondition for forming the gap G ₁ .

The gap G ₂ is, during assembly of the valve body 1, by lowering the position of the valve body 3 with respect to body 2, it has a gap for pressing the seal member 5 in the opening portion of the inlet and outlet opening 10, 11. The gap G ₂ is formed between the valve housing 13 and the semi-spherical portion 20, it is set to larger than the wear allowance of the seal member 5. In the present embodiment, when the support stem 28 is used, a space K ₃ that is approximately the same as the gap G ₂ is provided between the bottom surface of the support stem 28 and the top surface of the insertion hole portion 15.

  The support stem 28 at the bottom of the valve body 3 is inserted into the insertion hole 15, and as shown in FIGS. 2 (b) and 4 (b), a notch surface formed in the support stem 28 when the valve body 3 is rotated. Since the stoppers 18 are respectively engaged with the handle 29, the handle 36 provided in the rotation operation unit 6 can be rotated by about 90 °.

  When the handle 36 of the rotation operation unit 6 is attached to the valve body 3 and the handle 36 is rotated in the valve closing direction from the valve open state shown in FIGS. 3, 4 (a) and 4 (b), the male thread portion 33. The female screw portion 23 serves as a feed mechanism, and the valve body 3 moves downward with respect to the lid member 4 while rotating with respect to the valve body housing portion 13, so that the seal member 5 comes into pressure contact with the inner circumferential hemispherical surface 12. At this time, since the gap G is provided between the inner circumferential hemispherical surface 12 and the valve body 3 of the hemispherical portion 20, the valve body 3 rotates without sliding relative to the valve body housing portion 13. . When the valve body 3 is rotated by ¼ rotation, that is, 90 °, the sealing member 5 seals and seals the outflow inlets 10 and 11, thereby closing the valves shown in FIGS. 1, 2 (a), and 2 (b). The closed state is established and this fluid closed state is maintained. At this time, the valve body 3 moves with respect to the lid member 4 by a 1/4 pitch of the external thread portion 33 and the internal thread portion 23, and the seal member 5 moves to the outflow inlets 10 and 11 by this feed amount. It is press-contacted to the opening part.

  When the handle 36 is rotated in the opening direction from the valve closed state shown in FIGS. 1, 2 (a), and 2 (b), the male thread portion 33 and the female thread portion 23 serve as a feed mechanism, and the valve body 3. As the valve rotates, it moves upward with respect to the lid member 4 and the pressure contact force of the seal member 5 to the valve body storage portion 13 is reduced, and the valve is opened. In this case, when the valve body 3 is rotated by ¼, as shown in FIGS. 3, 4 (a), and 4 (b), the outflow ports 10 and 11 face the through-hole 24 of the valve body 3. It communicates in a fully open state, and this communication state is maintained.

When the sealing member 5 is worn with the use of the valve body 1 and it becomes difficult to maintain the sealing performance when the valve is closed, the sealing performance by the sealing member 5 can be recovered. In this case, with the valve body 3 fully opened, the male screw 32 and the female screw 16 are rotated in a loosening direction to separate the lid member 4 from the body 2 together with the valve body 3, and then the separated lid member 4 is separated. And the valve body 3 are separated by loosening the screwing of the external thread portion 33 and the internal thread portion 23. Subsequently, the separated valve body 3 may be inserted into the valve body housing portion 13, and the lid member 4 may be incorporated into the valve body 3 in the same manner as the assembly procedure described above so as to integrate them. By this re-assembly, the position of the valve body 3 with respect to the body 2 is lowered by the amount of wear of the seal member 5, and the seal member 5 is pressed against the opening portions of the outflow inlets 10 and 11. Thus, when the sealing performance by the seal member 5 is deteriorated, the gap G ₂ is provided in advance, and the seal member 5 is tightened using the gap G ₂ to restore the sealing performance. The sealing performance can be recovered by using the same seal member 5 until the amount of pressure contact of the seal member 5 becomes almost zero. Furthermore, when it is difficult to recover the sealing performance due to the recovery of the sealing performance, it may be replaced with a new sealing member 5.

  In the present embodiment, a screwed portion (referred to as an upper screwed portion for convenience) between the female screw 16 of the body 2 and the male screw 32 of the lid member 4, and the screw portion 33 of the lid member 4 and the valve body 3. The screwed portions (referred to as lower screwed portions for the sake of convenience) formed by the female screw portion 23 are all right-handed and set at the same pitch. Since the upper threaded portion is provided with a larger diameter than the lower threaded portion, the rotational moment becomes larger. As a result, the lid member 4 does not loosen when the valve body 3 is opened and closed. Further, the upper threaded portion may be left-handed according to the purpose, or the thread pitch of either the upper threaded portion or the lower threaded portion may be set to be larger than the other side.

  As described above, the valve body 1 in the above-described embodiment of the present invention has a valve body having the hemispherical portion 20 from the cylindrical opening 14 in the valve body housing portion 13 having the inner peripheral hemispheric surface 12 formed in the body 2. 3, and the circular outer peripheral portion 21 above the hemispherical portion 20 of the valve body 3 is attached to the cylindrical opening portion 14 via the sealing material 22, and the lid member 4 is attached from above to cover the cylindrical opening portion 14. Since the valve has a top entry type structure, the position of the valve body 3 with respect to the body 2 can be adjusted by the lid member 4, and a predetermined error of the valve body storage portion 13 can be absorbed while absorbing dimensional errors of the body 2 and the valve body 3. The valve body 3 can be easily mounted at the position.

  Here, in a general ball valve, a seal member is disposed on the outflow inlet side, a ball valve body is disposed at a position where a contact surface pressure necessary for sealing is applied to the seal member, and the ball valve body is rotated. It is structured to close the fluid by moving. In such a ball valve, the ball member and the seal member are arranged in the fluid flow direction by arranging the seal member in a state in which the diameter of the seal member is larger on the outer peripheral side than the outflow port in order to reliably close each outflow port. It is necessary to make it interfere.

  Furthermore, a sealing member and a fixing member for fixing the sealing member are required to close two or more outflow inlets. For this reason, as the number of outflow inlets increases, the overall complexity and size of the valve increases, and the weight increases. In addition, high dimensional accuracy of each component is required.

  Since the ball valve body and the seal member are disposed at the positions where they interfere with each other as described above, the structure inside the valve is complicated in order to prevent deformation and breakage of the seal member due to the ball valve body. For example, in a floating valve having a one-piece structure, an insert that is separate from the body is provided, and the insert is screwed from a pipe connection portion of the body so that the seal member and the ball valve body are tightened along the flow path direction. Become. In the 2- to 4-piece floating valve, a cap is provided separately from the body, and the cap is screwed from the upper side of the body to tighten the seal member and the sphere along the flow path direction. The trunnion valve has a structure in which each sealing member is tightened so as to come into contact with the sphere along the flow path direction from the pipe connection portion of the body.

In these cases, the number of assembly man-hours increases due to an increase in the number of outflow inlets, and when replacing seal members or consumable parts due to wear or wear, etc., remove the entire valve from the pipe, disassemble the valve, and replace parts. It also takes time and effort.
When the seal member is mounted, the initial sealing performance and sliding performance with the sphere are greatly affected by the fixing position between the sphere and the seal member. Therefore, the body is used to position the seal member at a predetermined position. On the other hand, high machining accuracy is required.

  Compared to the general ball valve as described above, the rotary valve of the above embodiment of the present invention is provided with the seal member 5 on the valve body 3 side. The valve can be closed with one seal member 5 without the need for a seal member. For this reason, it can be simplified and reduced in size and weight while reducing the number of parts, and the body 2, the hemispherical portion 20 of the valve body 3, and the seal member 5 do not require high processing accuracy. If the processing accuracy of the inner peripheral hemispherical surface 12 of the valve body storage part 13, specifically, the opening part (the valve seat surface of the body) of the outflow inlets 10 and 11 is ensured, the valve body 3 is inserted into the body 2. In this state, the lid member 4 can be incorporated into a predetermined state while ensuring sealing performance only by covering the lid member 4, and stable operability and sealing performance can be ensured.

  When the valve body is assembled, the valve body 3 on which the seal member 5 is mounted in advance can be inserted from the cylindrical opening 14 of the body 2, so that the body 2 can be provided in a one-piece structure to prevent external leakage. This eliminates the need to incorporate seal members, inserts, caps, etc. into the body from the outside, so there is no need to remove the entire seal member 5 or consumable parts from the piping when replacing the consumable parts or consumable parts. The man-hours are kept to a minimum.

  The lid member 4 is screwed into the cylindrical opening 14, and the male threaded portion 33 of the lid member 4 is threadedly engaged with the female threaded portion 23 of the valve body 3. A gap G is provided between the valve body 3 and the valve body 3 when the valve body 3 is rotated by the rotation operation portion 6 so that the valve body 3 is rotated without sliding by the male screw portion 33 and the female screw portion 23. Since the pressure is applied to the member 5 only when it is closed, the wear of the seal member 5 can be minimized without using a lubricant such as grease, and the deformation of the seal member 5 due to the fluid pressure can be reduced. The movement is also prevented, and the high sealing performance and durability of the sealing member 5 can be maintained. Thus, since the wear of the seal member 5 can be suppressed, the economy is excellent. Further, when the seal member 5 is worn, the sealing performance can be recovered by using the same seal member 5 as described above, so that it is not necessary to frequently replace the seal member 5 to reduce the cost. it can.

It is difficult to apply a pressure deviating from the fluid pressure to the seal member 5 and the pressure on the seal member 5 is kept almost constant at all times, so that the deformation of the seal member 5 can be prevented and durability can be improved. As described above, the sealing member 5 is tightened only at the time of sealing, and the force F (referred to as fluid pressing force for convenience) F that presses the valve body 3 by the fluid flows by the inclined sealing member 5. It is divided into a pressing force f _{1 in the} direction of the road and a pressing force f _{2 in the} direction perpendicular to the flow path. Accordingly, the force f ₁ that presses the valve body in the flow path direction is smaller than the fluid pressing force F, and the valve body 3 is less likely to come into contact with the body 2, so that the operating torque of the valve body 3 can be reduced. Further, in addition to the pressing force f _{2 in the} direction orthogonal to the flow path being smaller than the fluid pressing force F, the valve body 3 resists the pressing force f ₂ by utilizing screwing with the lid member 4. Therefore, the operating torque of the valve body 3 can be reduced. At this time, the operation torque is also reduced by the valve body 3 being restricted from moving in the flow path direction by the lid member 4 and being less likely to contact the body 2. As a result, the operating torque becomes substantially constant, and the occurrence of torque unevenness is suppressed. In the case of a high-pressure fluid, the valve body 3 may be restricted from moving in the flow path direction by supporting the support stem 28 with the insertion hole 15.

Further, the gap (cavity volume) G between the valve body 3 and the valve body storage portion 13 can be reduced to the minimum dimension based on the above-mentioned gaps G ₁ and G _2, and when the fluid flows from the inlet 11 to the outlet. Since the orifice part up to 10 has a substantially one-stage configuration, the fluid resistance on the inflow / outflow side is increased and the occurrence of cavitation is prevented as in the case of a cock or a ball valve of a general structure, and energy is prevented. The flow rate can be controlled while suppressing loss. Moreover, since the cavity volume is small, the abnormal pressure increase value is kept low and the pressure resistance is also increased. Further, since the valve body 3 is supported by the support stem 28, the position of the valve body 3 with respect to the rotation axis P is secured, and the valve body 3 can be prevented from moving to the secondary side due to fluid or thrust force. For this reason, the seal member 5 on one side (secondary side) is not rapidly consumed. Furthermore, since the seal member 5 has a disk shape, only the contact portion with the body 2 at the time of closing serves as a fluid contact surface portion, thereby preventing back leakage.

  FIG. 5A shows another mounting state of the seal member. In the same figure, the annular convex part 80 is provided in the opposing surface 25a with the sealing member 5 of the circular groove 25 of the valve body 3. As shown in FIG. When the seal member 5 of FIG. 5B is mounted in the circular groove 25, the annular protrusion 80 bites into the seal member 5, and the seal member 5 is pressed to face the opposing surface 25a of the circular groove 25, the seal member 5. The pressure contact force between the opposing surfaces 5b increases. Therefore, the so-called back leakage, in which the fluid flows to the back side of the seal member 5, is prevented, and the deformation or protrusion of the seal member 5 is prevented and the breakage is prevented. In addition, by improving the pressure contact force between the opposing surfaces 25 a and 5 b, the sealing surface pressure is increased at the sealing seal portion 81, which is a sealing portion of the sealing member 5, and the sealing surface 2 a of the body 2, and this sealing surface pressure is applied to the sealing member 5. By adding uniformly, the sealing performance is further improved.

  In this case, the seal member 5 has a short cylindrical shape, and is mounted so as to protrude outward (to the body 2 side) from the circular concave groove 25 of the valve body 3. Therefore, when the valve body 3 is attached to the body 2, the outer edge surface of the protruding portion of the seal member 5 and a part of the cylindrical side surface are brought into pressure contact with the inner peripheral hemispherical surface 12 of the body 2 to seal the fluid. Thus, since the seal member 5 has a short cylindrical shape, when the seal member 5 passes through the fluid passage hole 87 opened to the inside of the weekly inner hemispherical surface 12 during the opening and closing operation of the valve body 3, the surface of the seal member 5 is A gap δ is formed between the flat surface portion and the passage hole surface portion. This prevents the seal member 5 from protruding into the fluid passage hole 87 when the seal member 5 is tightened, and the seal member 5 does not get caught in the fluid passage hole 87 during the opening / closing operation of the valve body. The valve element can be operated with a smooth and light operating force, and the seal member 5 can be prevented from being damaged.

On the other hand, in the ball valve of Patent Document 1, since the valve body and the seal member are fitted and mounted in a state where the surface of the seal member coincides with the inner peripheral hemisphere of the body, the sealing force of the seal member is reduced. It is determined by the sealing force by the spring elastic restoring force, the sealing force by the spring pushing force on the back surface of the sealing member, or the sealing force by the elastic force of the O-ring. For this reason, even if additional tightening is to be performed, there is no function of adjusting the position of the sheet member, resulting in poor durability.
Further, since the surface shape of the seal member matches the spherical shape of the body and the valve body, the spherical portion of the seal member and the hemispherical portion of the inner periphery of the body are in total contact. Thereby, there also exists a fault that the operating torque of a valve body raises and operating force becomes heavy.
When the valve is closed, the stress is free in the fluid passage hole portion of the body due to the compressive force applied to the seal member, and the seal member protrudes inside the fluid passage hole portion due to the restoring force of the seal member. There is a possibility that the body cannot be manipulated or that the seal member may be damaged leading to fluid leakage.

FIG. 5C shows another example of the seal member. In this seal member 85, an annular convex portion 86 is formed on the surface 85 a facing the circular concave groove 25. When the seal member 85 is mounted in the circular groove 25, the annular convex portion 86 is pressed to increase the pressure contact force between the facing surface 25a of the circular groove 25 and the facing surface 85a of the seal member 85, and the above-described seal The same function as when the member 5 is mounted is exhibited.
As described above, an annular convex portion may be provided on any one of the circular concave grooves or the opposing surfaces of the seal member mounted in the circular concave grooves.

6 and 7 show a second embodiment of the rotary valve according to the present invention. In the following embodiments, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.
In the valve body 40 in this embodiment, a lid member 43 having a male screw 41 and a protruding pressing portion 42 is formed, and the male screw 41 of the lid member 43 is screwed to the female screw 16 of the body 2. Is.
Then, the valve body 3 of the hemispherical portion 20 is stored in the valve body storage portion 13, and the circular outer peripheral portion 21 is rotatably provided in the cylindrical opening portion 14 via the O-ring 22, and the lid member 43 is screwed. Thus, the sealing member 5 of the valve body 3 is retightened.

  When the seal member 5 is worn, it can be easily tightened by rotating the lid member 43 in the screwing direction, and the replacement frequency of the seal member 5 can be reduced. In the valve main body 40 in this embodiment, since the screw portion is not provided between the lid member 43 and the valve body 3, the structure can be simplified and the economy is excellent.

  FIG. 8 shows a third embodiment of the rotary valve according to the present invention. In the valve main body 50, a spring member 51 such as a disc spring is provided between the back surface 5a of the seal member 5 and the circular groove 25. The spring member 51 is used to increase the pressure by the seal member 5.

In the valve body 50, the lid member 52 is formed in a shape that can cover the cylindrical opening 14 of the body 2, and the lid member 52 has a protruding pressing portion 53 that can be press-fitted into the cylindrical opening 14. Is formed.
When the lid member 52 is covered with the body 2 in a state where the valve body 3 is inserted into the valve body housing portion 13, the pressing portion 53 is press-fitted into the cylindrical opening 14 and the lid member 52 is fixed to the body 2. The valve body 3 is pressed in the direction of the valve body storage portion 13 by the pressing portion 53 and mounted at a predetermined position, and the pressure by the seal member 5 can be ensured to be constant. Thus, when the mounting position of the valve body 3 with respect to the body 2 is determined when the lid member 52 is covered, the pressure by the seal member 5 can be adjusted by mounting the spring member 51 described above. Although not shown, the valve body can be mounted using a retaining ring instead of the lid member. In this case, a mounting groove in which a retaining ring can be mounted is formed on the inner peripheral surface of the cylindrical opening to accommodate the valve body. The valve body can be held in a rotatable state by mounting a retaining ring in the mounting groove after mounting the valve body on the part.

  In FIG. 9, 4th Embodiment of the rotary valve in this invention is shown. In the valve main body 90 of this embodiment, a cylindrical hole portion 94 is provided in a portion of the lid member 91 where the rotation operation portion 93 of the valve body 92 passes, and a female screw portion 95 is provided in the cylindrical hole portion 94. . On the other hand, the rotary operation portion 93 of the valve body 92 is provided with a circular outer peripheral portion 96, and a male screw portion 97 that can be screwed into the female screw portion 95 is formed on the circular outer peripheral portion 96.

  When the valve body 90 is assembled, the lid member 91 is screwed into the cylindrical opening 14 of the body 2 via the male screw 32 and the female screw 16. A male threaded portion 97 of the valve body 92 is screwed into the female threaded portion 95 of the lid member 91, and the valve body 92 is inserted into the valve body housing portion 13. At this time, a gap G ′ is provided between the valve body storage portion 13 and the valve body 92 of the inner circumferential hemispherical surface 12, and the valve body 92 can be moved up and down via the O-ring 22 by the rotation operation portion 93. Further, it is provided so as to be rotatable, and the outflow inlets 10 and 11 are hermetically sealed by the seal member 100 when closed.

  In the valve body 90, a metal sheet unit is fixed to a mounting groove 101 formed in the valve body 92 as the seal member 100. As shown in FIG. 10, the metal sheet unit 100 includes a metal sheet 102, a holder 103, a guide member 104, a sphere 105, a disc spring 106, and a split ring 107.

  The metal sheet 102 has a hermetic seal portion 108 for sealing, and an annular protrusion 109 is formed at a back side position facing the hermetic seal portion 108. An accommodating portion 110 is formed inside the annular protrusion 109, and a concave groove 111 is formed on the outer peripheral side. Although not shown in the drawing, the surface of the seal portion of the metal sheet 102 is subjected to surface hardening treatment by gas nitriding, so that biting and galling by the metal sheet 102 is prevented. The hermetic seal portion 108 is desirably formed with a radius of curvature smaller than the radius of curvature of the seat surface 112 that is a concave spherical surface of the contacted surfaces of the outflow inlets 10 and 11.

  The holder 103 is provided to mount a spherical body 105 made of, for example, a steel ball, a guide member 104, and a disc spring 106 between the holder 103 and the metal sheet 102, and a notch 113 is formed on a part of the outer periphery to form a circular one. The part is formed in a chipped shape. On the metal sheet 102 side of the holder 103, an annular mounting portion 114 for mounting the metal sheet 102, a mounting groove 115 for mounting the split ring 107 on the inner periphery of the annular mounting portion 114, and a sphere 105 at the central portion. A storage hole 116 for storage is formed. On the other hand, a press-fitting portion 117 is formed projectingly on the mounting side to the valve body 92.

  The guide member 104 is provided in a disc shape, a disc-shaped protrusion 118 capable of contacting the bottom 110a of the housing portion 110 on the metal sheet housing portion 110 side, and a storage hole for storing the sphere 105 on the holder 103 side. 119 is provided. Tapered surfaces 120 and 121 are provided on the bottom surface sides of the storage hole 119 and the storage hole 116 of the holder, respectively, and the back of the spherical body 105 stored by the tapered surfaces 120 and 121 is prevented. Two disc springs 106 are provided between the metal sheet 102 and the guide member 104.

In FIG. 10, when the metal sheet unit 100 is assembled, the guide member 104 is accommodated in the metal sheet accommodating portion 110 via the disc spring 106, and the spherical protrusion 105 of the metal sheet 102 is accommodated while the spherical body 105 is accommodated in each of the storage holes 116 and 119. The portion 109 is inserted inside the annular mounting portion 114 of the holder 103. Subsequently, the metal sheet 102 is integrated with the holder 103 by attaching the split ring 107 from the notch 113 between the concave groove 111 and the attachment groove 115. By attaching the split ring 107, the metal sheet 102 is prevented from coming off from the holder 103.
The metal sheet unit 100 is attached to the valve body 92 by press-fitting and fixing the press-fitting portion 117 into a circular groove 126 provided at the center position of the mounting groove 125 of the valve body 92, and the metal sheet unit 100 is mounted while being held by the holder 103. Mounted in the groove 125.

  The valve body 90 causes the metal sheet 102, the guide member 104, and the disc spring 106 to be brought into contact with the holder 103 by spherical point contact between the two spheres 105 and 105 attached to the holder 103 and the guide member 104 of the metal sheet unit 100. The holder 103 is pivotable and tiltable about the axis Q of the holder 103. Therefore, it is possible to seal the fluid by sealing the outflow inlets 10 and 11 while aligning the metal sheet 102 with the sheet surface 112. In the case of the sealing structure by the metal sheet unit 100, the metal sheet 102 is prevented from being crushed by the high rigidity, and is reliably sealed because the gap between the metal sheet 102 and the sheet surface 112 is closed by the above-described alignment operation. Fluid leakage is prevented.

  When the valve body 92 is in a free state (open state) other than the closed state and the sheet surface 112 and the metal sheet 102 are not in contact, the disc spring 106 is not compressed and the two disc springs 106 are not compressed. , 106 moves the metal sheet 102 in a direction protruding from the holder 103. At this time, since the guide member 104 is pressed against the sphere 105 in the axial center Q direction, a gap is generated between the guide member 104 and the holder 103 so that the guide member 104 moves in the axial center Q direction. Is prevented.

When the valve body 92 is rotated and reaches the moment when the metal sheet 102 comes into contact with the sheet surface 112, the metal sheet 102 can rotate with respect to the holder 103, so that a rotational moment is generated in the metal sheet 102.
In the fully closed state of the outflow inlets 10 and 11, the metal sheet 102 is in contact with the sheet surface 112, so that the two disc springs 106 and 106 are compressed and the metal sheet 102 resists this compression force. Then, it moves to the holder 103 side. In this case, as described above, the metal sheet 102 is aligned with the sheet surface 112 and comes into contact with the sheet surface 112, and the tip surface side of the protrusion 118 of the guide member 104 is in close contact with the bottom 110 a of the metal sheet storage unit 110. When the compression force of the disc spring 106 is applied, the surface pressure of the metal sheet 102 increases. In addition, since the metal sheet 102 is rotated by the rotational moment as described above, the uneven load on the metal sheet 102 is prevented and the occurrence of wear is made uniform. For this reason, even when a fluid such as a high-temperature fluid or a powdered fluid is allowed to flow, the wear of the metal sheet 102 can be minimized and high sealing performance can be maintained.

  The metal sheet unit 100 is a rotary valve having a structure in which sliding resistance is suppressed, that is, a rotary valve having a structure in which a clearance is provided between an inner peripheral hemispherical surface and a valve body, and an outflow inlet is hermetically sealed when the valve body is closed. It is suitable for. In this case, it is possible to improve the sealing performance while keeping the sliding resistance of the valve body low. On the other hand, the metal sheet unit 100 is a rotary valve having a structure capable of further tightening, that is, a clearance is provided between the valve body housing portion and the valve body, and the valve body is lowered to retighten the seal member of the valve body. You may apply to the rotary valve of a structure. In this case, when the sealing performance of the metal sheet 102 is weakened, the sealing performance can be restored by retightening. In any case, two or more sets of metal units can be attached to the valve body.

  In FIG. 11, 5th Embodiment of the rotary valve in this invention is shown. The valve body 60 in this embodiment includes a substantially hemispherical valve body 62 having a substantially L-shaped through-hole 61 and one seal member 5 provided in a direction substantially orthogonal to the through-hole 61, and an entrance / exit A saddle type three-way having two outflow inlets 63, 63 perpendicular to the axis of the valve body, and a bowl-shaped body 64 having one outflow inlet 63 parallel to the axis of the shaft. It is a valve. In this rotary valve, the valve body 62 is rotated to switch the three-way outflow inlets 63. A stem portion 65 and a handle portion 66 are integrally formed on the valve body 62 of the valve main body 60, thereby reducing the number of parts.

  In FIG. 12, the schematic sectional drawing of the other example of a multi-way valve is shown. As shown in FIG. 12B, the valve body 130 in this example has a substantially hemispherical shape having a T-shaped through-hole 131 and one seal member 5 provided in a direction substantially orthogonal to the through-hole 131. This is a horizontal three-way valve having a valve body 132 and a body 136 having three outlet / inlet ports 133, 134, 135 which are outlet / inlet passages provided in a direction perpendicular to the axis R of the valve body 132. In this rotary valve, the valve body 132 is rotated, and the flow path can be switched by the three-way outflow ports 133, 134, and 135.

  As described above, the rotary valve of the present invention is particularly suitable for the rotary valve having the above-described structure that can be tightened. In addition, the rotary valve may be a multi-way valve having another structure such as a vertical three-way valve, a horizontal three-way valve, or a horizontal four-way valve. In this case, when a rotary valve is used for these multi-way valves, the flow path at the inlet / outlet of the multi-way valve can be appropriately switched by at least one seal member 5 attached to the valve body itself. Performance can be recovered.

  Furthermore, as shown in FIG. 12 (a), the circular outer peripheral portion 137 of the valve body 132 in the valve main body 130 is formed with notch locking portions 138 at substantially 90 ° intervals. On the other hand, a female screw 139 is formed at one position at a height corresponding to the notch locking portion 138 of the body 136, and the male screw 141 of the ball plunger 140 is screwed into the female screw 139 from the side surface of the body 136. The ball plunger 140 has a ball body 142 and a coil spring 143 mounted therein, and is mounted while adjusting the position of the ball body 142 from the outside so as to protrude to the inner peripheral side of the body 136. After the ball plunger is mounted, the ball body 142 can be locked to the notch locking portion 138 every 90 ° by the elastic force of the coil spring 143. As a result, the handle 146 provided on the rotation operation portion 145 of the valve body 132 can be rotated approximately every 90 °. That is, when the ball body 142 is locked to the notch locking portion 138, an appropriate click feeling can be obtained, so that the valve element 132 can be rotated to a predetermined state easily and accurately.

When the ball plunger 141 is provided, it is particularly suitable for a rotary valve having a structure that can be tightened, and even after tightening, the same rotation of the valve body as before tightening is possible. On the other hand, a ball plunger can be provided on a rotary valve having a structure in which the sliding resistance of the valve body is suppressed, similar to the rotary valve having a structure sealed by the metal sheet unit 100 described above. Sliding resistance can be suppressed by reducing the force.
Furthermore, in this example, the ball plunger 141 is used as a stopper to the notch locking portion, but a plunger or the like having another structure may be used as the stopper.

  FIG. 13 shows a sixth embodiment of the rotary valve according to the present invention. In the valve main body 70 according to this embodiment, a notched surface portion 73 having a meat-like shape is provided on a valve body 72 that is not hemispherical. Also in this case, the same sealing performance and operability as those of the rotary valve can be exhibited. When the cut-out surface portion 73 is provided, the material used for the valve body 72 can be reduced to reduce the cost.

  In the above-described embodiment, the top entry type rotary valve has been described. However, a bottom entry type ball valve can be provided similarly, and the present invention is limited to the description of the above embodiment. For example, a shape other than a complete hemispherical surface may be used, for example, a part of the inner peripheral hemispherical surface of the body or a hemispherical portion of the valve body may be provided with a flat surface. Various modifications can be made without departing from the spirit of the invention described in the scope.

DESCRIPTION OF SYMBOLS 1 Valve body 2 Body 3 Valve body 4 Lid member 5 Seal member 5b Opposite surface 6 Rotation operation part 10 Outlet 11 Inlet 12 Inner circumference hemisphere 13 Valve body accommodating part 14 Cylindrical opening part 20 Semispherical part (insertion part) )
21 circular outer periphery 22 O-ring (seal material)
23 Female thread 24 Through hole 25 Circular groove (mounting groove)
25a Opposing surface 31 Tube portion 33 Male thread portion 80 Annular convex portion 81 Seal seal portion 100 Metal sheet unit 101 Mounting groove 102 Metal sheet 103 Holder 104 Guide member 105 Spherical body 106 Disc spring 138 Notch portion 140 Ball plunger (stopper)
146 Handle G Gap Q Center axis

Claims (10)

  A body having at least two outflow inlets is formed with a valve body housing portion having an inner hemispherical surface and a cylindrical opening opened from the valve body housing portion, and the valve body is inserted into the valve body housing portion from the cylindrical opening. A circular outer peripheral portion provided above the valve body is rotatably provided in the cylindrical opening through a sealing material, the cylindrical opening is covered with a lid member, and the valve The body is formed with a through-hole communicating with the outflow inlet and a mounting groove facing the outflow inlet in a direction intersecting with the through-hole, and a sealing member for closing the outflow inlet is installed in the mounting groove. A rotary valve characterized by that.   The rotary valve according to claim 1, wherein an outer peripheral surface of the valve body is a hemispherical portion, and the circular outer peripheral portion is integrally formed on an upper portion of the hemispherical portion.   The lid member is screwed into the cylindrical opening, and the male threaded portion of the cylindrical portion provided on the lid member is formed on the inner peripheral surface of the circular outer peripheral portion of the valve body, and is screwed into the threaded portion. A clearance is provided between the body storage portion and the valve body, and the valve body is provided so as to be movable up and down via an O-ring at the rotation operation portion, and can be freely rotated. The rotary valve according to claim 1 or 2, which is hermetically sealed.   The screw member is formed on the circular outer peripheral portion of the rotation operation portion of the valve body in the screw portion for screwing the lid member into the cylindrical opening and providing in the cylindrical hole portion through which the rotation operation portion of the lid member passes. Are screwed together to provide a gap between the valve body storage portion and the valve body, and the valve body can be moved up and down via an O-ring by the rotation operation portion and can be freely rotated. The rotary valve according to claim 1 or 2, wherein the outflow inlet is hermetically sealed with the seal member.   The valve body housing portion accommodates a hemispherical valve body, and the circular outer peripheral portion is rotatably provided in the cylindrical opening via an O-ring. The rotary valve according to claim 1 or 2, wherein the sealing member is tightened.   The rotary valve according to any one of claims 1 to 5, wherein the mounting groove is a circular concave groove, and a disc-like elastic seal member is mounted in the circular concave groove.   The rotary valve according to claim 6, wherein an annular convex portion is provided on one of the opposing surfaces of the circular concave groove or the opposing surface of the seal member mounted in the circular concave groove.   A metal sheet unit capable of hermetically sealing the outflow inlet is fixed to the mounting groove, and the metal sheet unit holds the metal sheet as a seal member to which a guide member is attached via a disc spring and the metal sheet. A holder mounted in the mounting groove, and the metal sheet is rotated with respect to the holder around the axis of the holder by spherical point contact of two spheres mounted between the holder and the guide member. The rotary valve according to any one of claims 3 to 7, wherein the rotary valve is provided so as to be movable and tiltable.   Notch locking portions are formed in the circular outer peripheral portion at intervals of approximately 90 °, and a handle provided on the rotary operation portion is locked at approximately 90 ° intervals by locking a ball plunger screwed from the side of the body into the notch locking portion. The rotary valve according to any one of claims 1 to 8, wherein the rotary valve can be rotated.   When the rotary valve according to any one of claims 1 to 9 is used for a multi-way valve such as a vertical three-way valve, a horizontal three-way valve, or a horizontal four-way valve, the flow of the multi-way valve inlet / outlet is made by at least one seal member attached to the valve body itself. A rotary valve characterized in that a path can be appropriately switched.

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