JP2017115970A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device capable of easily performing an opening/closing operation of a valve.SOLUTION: A rod-shaped valve element 4 moving in a longitudinal direction while restricted in rotation, is brought into contact with or separated from a valve seat 3 formed in a flow channel 2 of a valve body 1, and a fitting sleeve 11 is fixed into an insertion hole 4a formed from a rear end portion of the valve element 4 to a front part. A valve rod 5 is inserted into the insertion hole 4a of the valve element 4, and a male screw portion for moving as a double-start thread of a left-hand screw formed on an outer peripheral portion of the valve rod 5, and a female screw portion 11b for moving as a double-start thread of a left-hand screw formed in the fitting sleeve 11 are screw-connected. A supporting sleeve 16 is rotatably supported by a supporting member 8 fixed to a rear end portion of a yoke 7. A female screw portion 16a for fastening as a single-start thread of a right-hand screw formed on the supporting sleeve 16 and a male screw portion 5c for fastening as a single-start thread of right-hand screw formed on a rear end portion of the valve rod 5 are screw-connected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve that moves a valve stem by rotating a handle or by a pneumatic or electric rotary drive, and moves a valve body connected to the valve stem in a direction to be attached to or detached from a valve seat of a valve body. Relates to the device.

  Conventionally, as a valve device provided in the middle of a fluid transfer pipe, a valve body having a flow path through which a fluid flows, a valve seat formed in the flow path, a valve body that contacts and separates from the valve seat, A valve body is connected to the front end and a rear end protrudes from the valve body, a handle fixed to the rear end of the valve body, a yoke fixed to the valve body, and a rear end of the yoke And a yoke bush that supports the valve stem has been proposed (see, for example, Patent Document 1).

  In the valve device described in Patent Document 1, by rotating the handle, the valve rod screwed to the yoke bush fixed to the yoke moves in the axial direction while rotating, so that the valve seat facing the flow path The valve body is contacted and separated.

  In addition, as a valve device, there is an air type or an electric type in which a valve rod screwed to a yoke bush fixed to a yoke is rotationally driven using an air motor or an electric motor, and a valve body is brought into contact with or separated from a valve seat. Are known.

JP 2001-349447 A

  The valve device described in Patent Document 1 and the above-described pneumatic and electric valve devices have a force in a direction away from the valve seat (valve opening direction) with respect to the valve body due to the pressure of the fluid in the flow path. May work. For this reason, normally, for the purpose of maintaining the valve closed state, the screw connection between the valve stem and the yoke bush is a single thread screw connection capable of securing a fastening force.

  Since the single thread screw has a lead equal to the pitch, the valve device described in Patent Document 1 has a large number of rotations of the handle and a fastening force (screw There is a problem that it takes time and effort to rotate the handle because it is necessary to rotate the handle against the frictional resistance at the part.

  Further, in the air type valve device, when the number of rotations of the valve rod increases, there is a problem that the air consumption amount of the air motor that rotationally drives the valve rod increases. In the electric valve device, it is necessary to rotate the valve stem within the rated time of the electric motor to move the valve body in the axial direction. When the number of rotations of the valve stem increases, an electric motor with a large output is selected. There was a problem that it was necessary.

  Accordingly, an object of the present invention is to provide a valve device that can easily perform opening and closing operations of the valve.

  In order to solve the above-described problems, the present invention provides a valve body having a flow path, a valve seat formed in the flow path, and moves in the front-rear direction in a state where rotation is restricted so as to contact the valve seat. A valve body to be separated; a valve stem coupled to the valve body; an operating member attached to the valve stem; a yoke fixed to the valve body; and a support sleeve for supporting the valve stem, A support member fixed to the yoke, and the valve body includes an insertion hole formed forward from a rear end portion, and a fitting sleeve fitted into the insertion hole, and the fitting sleeve Has an internal thread part for movement, the support sleeve has an internal thread part for fastening, the valve stem is formed on the outer periphery part, and the insertion hole of the valve body Formed in the inner peripheral portion, and a moving male screw portion that is screwed to the fitting sleeve in a state of being inserted into the fitting sleeve, A fastening male screw portion that is screw-coupled to the support sleeve, and is rotated by the operating member. The moving female screw portion and the moving male screw portion include the fastening female screw portion and the fastening female screw portion. It is possible to employ a configuration in which the number of threads is large with respect to the fastening male thread, and the thread is a multiple thread in the reverse thread direction.

  According to this configuration, the moving male screw portion of the valve stem and the moving female screw portion of the fitting sleeve are screw connections of multi-thread screws. For this reason, the fastening force is smaller than that of the screw connection by the single thread screw, and the movement distance (lead) in the front-rear direction per one rotation of the valve stem rotated by the operation member is larger than that of the single thread screw connection. Become.

  Further, in the valve closed state, a force in the direction away from the valve seat (the valve opening direction) may act on the valve body due to the pressure of the fluid in the flow path. At this time, since the valve stem is fastened to the support sleeve by screw connection as described above, the valve closed state can be maintained.

  Further, it is possible to adopt a configuration in which the support sleeve is rotatably supported with respect to the support member, and the operation member is attached to the valve rod via the support sleeve.

  According to this configuration, since the operation member is attached to the support sleeve, even if the valve rod is rotated by the operation member and moved in the front-rear direction, the position of the operation member does not move in the front-rear direction with respect to the support sleeve.

  In the above configuration, the valve stem has a stopper that protrudes radially outward between the moving male screw portion and the fastening male screw portion, and the stopper is in contact with the support member, It is possible to adopt a configuration in which the movement of the valve stem in the axially rearward direction is restricted.

  According to this configuration, when the valve stem is rotated in the valve opening direction by the operation member, the stopper of the valve stem is abutted against the support member, and the movement of the valve stem beyond the rear in the axial direction can be restricted. it can.

  In order to solve the above-described problems, the present invention provides a valve body having a flow path, a valve seat formed in the flow path, and moves in the front-rear direction in a state where rotation is restricted so as to contact the valve seat. A valve body to be separated, a valve stem connected to the valve body, an operation member attached to the valve stem, a yoke fixed to the valve body, and a support sleeve for supporting the valve stem, A support member fixed to the yoke, and the support sleeve has a fitting sleeve that fits into an inner periphery thereof, and the operation member is attached to the valve stem via the fitting sleeve. The valve stem has a moving male screw portion on the outer peripheral portion, the support sleeve has a fastening female screw portion on the inner peripheral portion, and the fitting sleeve has an inner peripheral portion. A moving internal thread portion that is screw-coupled to the moving external thread portion, and an outer peripheral portion. A fastening male screw portion that is screw-coupled to the fastening female screw portion, and is rotated by the operation member. The moving female screw portion and the moving male screw portion are The number of threads is large with respect to the female thread part and the fastening male thread part, and a configuration that is a multiple thread in the reverse thread direction can be employed.

  In this configuration, a multi-threaded screw connection is made between the moving male screw portion of the valve stem and the moving female screw portion of the fitting sleeve. For this reason, compared with the case of screw connection of a single thread screw, the fastening force is smaller than that of screw connection by a single thread screw, and the movement distance in the front-rear direction of the valve stem per rotation of the fitting sleeve rotated by the operating member ( Lead) increases.

  In this invention, since the male screw portion for moving the valve stem and the female screw portion for moving the fitting sleeve are multi-threaded screw couplings, the fastening force is smaller than that of the single-threaded screw coupling, and the operation member is used. Since the moving distance in the front-rear direction of the rotating valve rod or the valve rod per rotation of the fitting sleeve is increased, the opening / closing operation of the valve can be easily performed.

Sectional front view of the valve device of the first embodiment according to the present invention Sectional front view showing the main part in the valve open state Sectional front view showing the main part of the valve closed state Sectional front view which shows the principal part of the modification of the valve apparatus of 1st embodiment. Sectional front view which shows the principal part of the valve apparatus of 2nd embodiment which concerns on this invention Sectional front view of the main part showing the valve closed state Sectional front view of the valve device of the third embodiment according to the present invention Sectional front view of the main part showing the valve open state

Hereinafter, a valve device according to a first embodiment of the present invention will be described with reference to FIGS.
The valve device according to this embodiment is provided in the middle of a pipe for transferring a highly viscous fluid such as a resin polymer, a powder containing a lump, or a liquid fluid.

  As shown in FIGS. 1 and 2, the valve device includes a valve body 1 having a flow path 2 through which a fluid flows, a valve seat 3 formed in the flow path 2 of the valve body 1, and front and rear with respect to the valve seat 3. A valve body 4 that moves in the direction of contact and separates, a valve rod 5 that is connected to the valve body 4 and has a rear end protruding from the valve body 1, and a handle as an operation member attached to the rear end of the valve rod 5 6, a yoke 7 fixed to the rear end portion side of the valve body 1, and a support member 16 having a support sleeve 16 for supporting the valve stem 5 and fixed to the rear end portion of the yoke 7.

  Here, the front-rear direction (front-rear) means the front-rear direction (front-rear) when the direction in which the valve element 4 moves toward the valve seat 3 is the front and the direction in which the valve element 4 moves away from the valve seat 3 is the rear. To do.

  As shown in FIG. 1, the valve body 1 is formed in a cylindrical shape, and includes a seat cylinder 1 a that is coaxially connected to a front end portion thereof, and a branching portion 1 b that branches at a midway position in the length direction. The valve body 1 includes an inlet-side flow path 2a that reaches the branch portion 1b through the inside of the seat tube 1a, and an outlet-side flow path 2b that is communicated with the inlet-side flow path 2a and formed in the branch portion 1b. A flow path 2 is provided.

  Further, in the valve body 1, the center line of the inlet side flow path 2a and the central axis of the valve body 4 are in a straight line, and the central axis of the valve body 4 and the center line of the outlet side flow path 2b are acute angles. A radially outward flange 1c is formed on the outer peripheral portion of the rear end portion.

  The seat cylinder 1a has a cylindrical inner surface, and a valve seat 3 is formed inside the front end portion, and is connected to the front end portion of the valve body 1 via a gasket. The inner surface of the seat tube 1a and the inner surface of the front end portion of the valve body 1 form a continuous cylindrical surface having the same diameter. A cylindrical valve body 4 that is in contact with and away from the valve seat 3 is disposed inside the valve body 1 so as to be slidable in the front-rear direction.

  Further, the valve main body 1 has a large-diameter portion 1d formed on the rear side of the outlet-side flow path 2b. A guide tube 9 for guiding the valve body 4 is fitted in the large diameter portion 1d. The valve body 4 slides in the front-rear direction within the guide tube 9.

  Packing 9 a and 9 b are fitted on the inner peripheral portion and the outer peripheral portion of the guide tube 9, the inner peripheral portion side packing 9 a contacts the valve body 4, and the outer peripheral side packing 9 b is larger than the valve body 1. The liquid tightness is ensured by contacting the diameter portion 1d.

  The guide tube 9 is pressed forward by the presser wheel 10 through the annular body 9c at the rear end portion of the valve body 1. The retaining ring 10 is fixed to the flange 1c of the valve body 1 with an existing fastener.

  The valve body 4 has a rod shape and includes an insertion hole 4a formed forward in the center of the rear end surface and a seat 4b formed with a front end portion. The insertion hole 4a has an inner diameter through which the valve stem 5 can be inserted, and a fitting sleeve 11 is fixed to the inner peripheral portion of the rear end portion by screw connection.

  A lock ring 12 is fixed to the outer peripheral portion on the rear end side of the valve body 4 by a bolt 13. The bolt 13 is screwed in a radial direction at one place in the circumferential direction of the lock ring 12, and protrudes radially outward from a long hole 7 c formed in the yoke 7.

  The tip of the bolt 13 presses the outer peripheral portion of the valve body 4, thereby fixing the lock ring 12 to the valve body 4 so as not to rotate. When a rotational force is applied to the valve body 4, the bolt 13 is locked to the peripheral portion of the long hole 7 c of the yoke 7, and the valve body 4 is in a state in which the rotation is restricted.

  The fitting sleeve 11 has a cylindrical shape, has a radially outward flange 11a at the rear end, and is screwed into the insertion hole 4a so that the flange 11a contacts the rear end of the valve body 4. . Further, the fitting sleeve 11 is formed with a moving female screw portion 11b which is a double thread of a left-hand thread on the inner peripheral portion.

  The valve stem 5 is a shaft body having a circular cross section, and has a stopper 5a protruding radially outward toward the rear end portion in the length direction. The valve stem 5 is formed with a moving male screw portion 5b, which is a left-hand thread double thread, which is screw-coupled to the moving female screw portion 11b of the fitting sleeve 11, at the outer peripheral portion in front of the stopper 5a. Further, the valve stem 5 is formed with a fastening external thread portion 5c which is a single thread of a right-hand thread on the outer peripheral portion behind the stopper 5a.

  The yoke 7 has a cylindrical shape, a radially outward flange 7a formed at the front end portion thereof, cutout windows 7b and 7b formed at two locations in the circumferential direction of the front end edge, and one cutout window 7b. And a long hole 7c continuously extending rearward from the rear end edge.

  The yoke 7 is fixed to the rear end side with respect to the flange 1c of the valve body 1 by an existing fastener in a state where the flange 7a and the flange 1c of the valve body 1 are in contact with each other.

  The support member 8 is rotatably supported by a cylindrical base portion 14 fitted and fixed to the inner peripheral portion of the rear end portion of the yoke 7, a bearing 15 attached to the inner peripheral portion of the base portion 14, and the bearing 15. And a support sleeve 16.

  The base portion 14 has a cylindrical shape whose front end portion is closed and whose rear end portion is open, and a through hole 14a is formed at the center of the front end portion to be closed. The through hole 14 a has an inner diameter that is larger than the outer diameter of the valve stem 5 and smaller than the outer diameter of the stopper 5 a of the valve stem 5.

  The bearings 15 are arranged at two locations in the front-rear direction of the inner peripheral portion of the base portion 14. The support sleeve 16 is inserted into the base portion 14 and is rotatably supported by bearings 15 and 15 fitted on the outer peripheral portion.

  Further, the support sleeve 16 passes through an annular cover 17 that closes the rear end portion of the base portion 14 that is open, and the rear end portion projects from the base portion 14, and the handle 6 is connected to the projecting portion via the boss portion 18. Is fixed. The outer diameter of the support sleeve 16 is formed larger than the inner diameter of the through hole 14 a of the base portion 14.

  A fastening female thread portion 16 a that is a single thread of a right-hand thread that is screw-coupled to the fastening male thread portion 5 c of the valve stem 5 is formed on the inner peripheral portion of the support sleeve 16. 5c is in a state of being screw-coupled. The support sleeve 16 is positioned by a nut 19 fastened to the rear end portion of the valve stem 5.

  In addition, although the internal thread part 11b for the movement of the fitting sleeve 11 and the external thread part 5b for the movement of the valve stem 5 are left-handed double threads, they may be 3-threads or 4-threads. The point is that the number of threads is larger than that of the female thread portion 16a for fastening of the support sleeve 16 and the male thread portion for fastening of the valve stem 5, and a multi-thread screw in the reverse screw direction may be used.

  In this embodiment, the handle 6 is used as an operation member, and is a manual type in which the handle 6 is manually rotated. However, an air type or an electric type in which the handle is rotated by an air motor or an electric motor is adopted. can do.

  For example, in the case of an air type, as shown in FIG. 4, a gear 18a fixed to a boss portion 18 of a support sleeve 16 as an operation member, a pinion 18b meshing with the gear 18a, and an air motor 20 that rotates the pinion 18b are provided. .

  In the case of the air type, the handle 6 extends the support sleeve 16 rearward and is attached to the rear end portion thereof, so that the handle 6 can be rotated manually. Alternatively, only the operation member may be attached without attaching the handle 6 to the support sleeve 16, and the support sleeve 16 may be rotated by the air motor 20.

  In the case of this air type, the moving distance in the front-rear direction of the valve stem 5 per one rotation of the support sleeve 16 becomes larger than that of the above-described air type. That is, if the movement distance of the valve stem 5 is the same, the rotation speed of the support sleeve 16 is reduced, and the air consumption of the air motor that rotationally drives the support sleeve 16 can be suppressed.

  Moreover, it is good also as an electric type provided with the electric motor instead of the air motor 20 which comprises an operation member. In the case of this electric type, the moving distance in the front-rear direction of the valve stem 5 per one rotation of the support sleeve 16 is larger than that of the electric type described above. For this reason, since the moving speed of the valve body 4 is increased, the opening / closing time of the valve is shortened, and it is not necessary to select an electric motor having a large output.

  The valve device of this embodiment is configured as described above, and is a support sleeve that is rotatably supported by the bearing 15 when the handle 6 is rotated in the valve opening direction (counterclockwise) in a state of facing the handle 6. 16 rotates.

  The support sleeve 16 is fastened by screw connection between the fastening female screw portion and the fastening male screw portion 5 c of the valve stem 5. For this reason, the valve stem 5 integrally rotates counterclockwise with respect to the support sleeve 16.

  Here, the valve body 4 is in a state in which the bolt 13 is locked to the peripheral portion of the long hole 7 c of the yoke 7 and the rotation thereof is restricted. When the valve stem 5 rotates counterclockwise with respect to the valve body 4 in a state where the rotation is restricted, the left screw thread coupling between the moving male screw portion 5b and the moving female screw portion 11b of the fitting sleeve 11 is performed. As a result, the valve body 4 moves backward with respect to the valve stem 5.

  Subsequently, when the handle 6 is rotated counterclockwise and the valve stem 5 is rotated via the support sleeve 16, the valve body 4 moves rearward from the branch portion 1 b of the valve body 1, and the valve is opened. (See FIG. 2).

  In this valve open state, the stopper 5a of the valve stem 5 abuts the fitting sleeve 11 of the valve body 4, and the backward movement of the valve body 4 is restricted. Further, when the handle 6 is rotated counterclockwise, the valve stem 5 and the support sleeve 16 are joined by the right screw connection of the fastening male screw portion 5 c of the valve stem 5 and the fastening female screw portion 16 a of the support sleeve 16. Is concluded.

  When the handle 6 is rotated in the valve closing direction (clockwise) in the valve open state, the valve stem 5 screwed to the support sleeve 16 is integrally rotated clockwise as in the case of rotating counterclockwise. To do.

  When the valve stem 5 rotates clockwise with respect to the valve body 4 whose rotation is restricted, due to the left screw connection of the moving male screw portion 5b and the moving female screw portion 11b of the fitting sleeve 11, The valve body 4 moves forward with respect to the valve stem 5.

  Subsequently, when the handle 6 is rotated clockwise and the valve rod 5 is rotated via the support sleeve 16, the valve body 4 comes into contact with the valve seat 3 to be closed (see FIG. 1). When the handle 6 is further rotated clockwise in this valve closed state, the valve stem 5 moves rearward and the stopper 5a hits the front end surface of the support member 8 (see FIG. 3).

  When the handle 6 is rotated clockwise with the stopper 5a abutting, the valve stem is connected by screw coupling of the right-hand thread between the fastening male screw portion 5c of the valve stem 5 and the fastening female screw portion 16a of the support sleeve 16. 5 and the support sleeve 16 are fastened.

  In the valve device operated in this way, the moving male screw portion 5b of the valve stem 5 and the moving female screw portion 11b of the fitting sleeve 11 are two-threaded screw coupling. As a result, the fastening force becomes smaller and the lead becomes larger.

  For this reason, the handle 6 can be rotated with a light force, and the movement distance in the front-rear direction of the valve body 4 per one rotation of the handle 6 is increased, so that the valve can be easily opened and closed.

  Further, since the handle 6 is attached to the support sleeve 16, the position of the handle 6 does not move in the front-rear direction with respect to the support sleeve 16 even if the valve stem 5 moves in the front-rear direction due to the rotation of the handle 6.

  Next, a valve device according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, in the support member 8, the support sleeve 16 is non-rotatably attached to the base portion 14, the handle 6 as an operation member is attached to the rear end portion of the valve stem 5, and It differs from the structure of the first embodiment described above in that the valve stem 5 does not have the stopper 5a. The other structure is considered to be the same as that of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  In the valve device of this embodiment, the support sleeve 16 is fixed to the inner peripheral portion of the support member 8 on the rear end side of the base portion 14, and the rear end portion of the valve stem 5 passes through the through hole 14 a of the base portion 14. . The fastening male screw portion 5 c of the valve stem 5 is screwed to the fastening female screw portion 16 a of the support sleeve 16.

  When the handle 6 of this embodiment is rotated in the valve opening direction (counterclockwise), the valve stem 5 rotates integrally. As in the case of the first embodiment described above, when the valve stem 5 rotates counterclockwise with respect to the valve body 4 whose rotation is restricted, the valve body 4 moves rearward with respect to the valve stem 5.

  Subsequently, when the handle 6 is rotated counterclockwise and the valve stem 5 is rotated, the valve is opened, and the fitting sleeve 11 of the valve body 4 is attached to the support member 8 and the front end of the base 14 as shown in FIG. The rearward movement of the valve body 4 is restricted by hitting the surface.

  Further, when the handle 6 is rotated counterclockwise, the valve stem 5 and the support sleeve 16 are joined by the right screw connection of the fastening male screw portion 5 c of the valve stem 5 and the fastening female screw portion 16 a of the support sleeve 16. Is concluded.

  When the handle 6 is rotated in the valve closing direction (clockwise) in the valve open state, the valve stem 5 rotates integrally in the clockwise direction. When the valve stem 5 rotates in the same direction, the valve body 4 whose rotation is restricted moves forward with respect to the valve stem 5, and the valve body 4 comes into contact with the valve seat 3 to be in a closed state.

  When the handle 6 is further rotated clockwise in this valve closed state, the right screw thread coupling of the male screw portion 5c for fastening the valve stem 5 and the female screw portion 16a for fastening the support sleeve 16 is performed. The rod 5 and the support sleeve 16 are fastened.

  In this embodiment, the moving male screw portion 5b of the valve stem 5 and the moving female screw portion 11b of the fitting sleeve 11 are screw coupling of double threads. For this reason, as in the case of the first embodiment, the handle 6 can be rotated with a light force, and the moving distance in the front-rear direction of the valve body 4 per one rotation of the handle 6 increases. Operation can be performed easily.

  In this embodiment as well, the handle 6 is employed as the operation member. However, as in the case of the first embodiment described above, an air type in which the support sleeve 16 is rotated by an air motor or an electric motor constituting the operation member. An electric type can be adopted.

  A valve device according to a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the fitting sleeve 11 is screwed to the inner periphery of the support sleeve 16, the rear end of the valve body 4 is fixed to the front end of the valve stem 5, It differs from the structure of the second embodiment described above in that only the moving male screw portion 5b is formed on the outer peripheral portion and the handle 6 is attached to the fitting sleeve 11. The other structure is considered to be the same as that of the second embodiment, and the same reference numerals are given and description thereof is omitted.

  The valve body 4 of the valve device of this embodiment does not have the insertion hole 4a, and the valve rod 5 is coaxially fixed to the rear end portion thereof. The valve stem 5 has only a moving male screw portion 5b formed on the outer peripheral portion.

  The support sleeve 16 has a fastening female thread portion 16 a formed on the inner peripheral portion, and is fixed to the inner peripheral portion on the rear end side of the base portion 14 of the support member 8. The fitting sleeve 11 has a fastening male screw portion 11c that is a single thread of a right-hand thread on the outer peripheral portion, and a moving female screw portion 11b that is a double-threaded screw of a left-hand screw on the inner peripheral portion.

  The fitting sleeve 11 is screw-coupled to the fastening female screw portion 16 a of the support sleeve 16 and is screw-coupled to the moving male screw portion 5 b of the valve stem 5 that penetrates the through hole 14 a of the base portion 14. As for the fitting sleeve 11, the handle | steering-wheel 6 is being fixed via the boss | hub part 18 at the rear-end part.

  When the handle 6 of this embodiment is rotated in the valve opening direction (counterclockwise), the fitting sleeve 11 integrally rotates in the same direction. When the fitting sleeve 11 rotates, the valve stem 5 fixed to the valve body 4 whose rotation is restricted moves backward as in the case of the second embodiment described above.

  Subsequently, when the handle 6 is rotated counterclockwise and the fitting sleeve 11 is rotated, the valve is opened, and as shown in FIG. 8, the valve body 4 hits the support member 8 against the front end surface of the base 14, The rearward movement of the valve body 4 is restricted.

  Further, when the handle 6 is rotated counterclockwise, the fitting sleeve 11 is moved rearward by the right screw connection of the fastening male screw portion 11c of the fitting sleeve 11 and the fastening female screw portion 16a of the support sleeve 16. It moves and is fastened to the support sleeve 16.

  When the handle 6 is rotated in the valve closing direction (clockwise) in the valve open state, the fitting sleeve 11 is integrally rotated in the same direction, and the valve rod 5 fixed to the valve body 4 whose rotation is restricted is forward. Move to. When the valve stem 5 moves forward, the valve body 4 moves forward, comes into contact with the valve seat 3, and is in a closed state.

  In this closed state, when the handle 6 is further rotated clockwise, due to the right screw connection between the fastening female thread 16a of the support sleeve 16 and the fastening male thread 11c of the fitting sleeve 11, The valve stem 5 and the fitting sleeve 11 are fastened.

  In this embodiment, the moving male screw portion 5b of the valve stem 5 and the moving female screw portion 11b of the fitting sleeve 11 are screwed by a double thread. For this reason, as in the case of the second embodiment, the handle 6 can be rotated with a light force, and the moving distance in the front-rear direction of the valve body 4 per one rotation of the handle 6 increases. Operation can be performed easily.

  In this embodiment, the handle 6 is employed as the operation member. However, as the operation member, a gear fixed to the boss portion 18 of the fitting sleeve 11, a pinion that meshes with the gear, an air motor that rotates the pinion, and It is possible to adopt an air type or an electric type in which the fitting sleeve 11 is rotated by an air motor or an electric motor constituting the operation member.

DESCRIPTION OF SYMBOLS 1 Valve body 1a Seat cylinder 1b Branch part 1c Flange 1d Large diameter part 2 Flow path 2a Inlet side flow path 2b Outlet side flow path 3 Valve seat 4 Valve body 4a Insertion hole 4b Seat 5 Valve rod 5a Stopper 5b Moving male thread part 5c Fastening male thread part 6 Handle 7 Yoke 7a Flange 7b Notch window 7c Long hole 8 Support member 9 Guide tube 9a, 9b Packing 9c Annulus 10 Holding ring 11 Fitting sleeve 11a Flange 11b Moving female thread part 11c For fastening Male thread 12 Lock ring 13 Bolt 14 Base 14a Through hole 15 Bearing 16 Support sleeve 16a Fastening female thread 17 Cover 18 Boss 18a Gear 18b Pinion 19 Nut 20 Air motor

Claims (4)

A valve body having a flow path, a valve seat formed in the flow path, a valve body that moves in the front-rear direction in a state where rotation is restricted, and that contacts and separates from the valve seat, and is connected to the valve body A valve stem, an operation member attached to the valve stem, a yoke fixed to the valve body, a support sleeve that supports the valve stem, and a support member fixed to the yoke,
The valve body has an insertion hole formed from the rear end portion toward the front, and a fitting sleeve fitted into the insertion hole, and the fitting sleeve has a female thread portion for movement at an inner peripheral portion. The support sleeve has a fastening female thread portion on an inner peripheral portion, and the valve stem is formed on the outer peripheral portion, and is inserted into the insertion hole of the valve body in the fitting sleeve. A moving male screw portion that is screw-coupled, and a fastening male screw portion that is formed on an inner peripheral portion and is screw-coupled to the support sleeve, and is rotated by the operating member; The moving male screw portion has a larger number of threads than the fastening female screw portion and the fastening male screw portion, and is a multi-threaded screw in a reverse screw direction.   The valve device according to claim 1, wherein the support sleeve is rotatably supported with respect to the support member, and the operation member is attached to the valve stem via the support sleeve.   The valve stem has a stopper protruding radially outward between the moving male screw portion and the fastening male screw portion, and the stopper is in contact with the support member, and the shaft of the valve stem is The valve device according to claim 2, wherein movement backward in the direction is restricted. A valve body having a flow path, a valve seat formed in the flow path, a valve body that moves in the front-rear direction in a state where rotation is restricted, and that contacts and separates from the valve seat, and is connected to the valve body A valve stem, an operation member attached to the valve stem, a yoke fixed to the valve body, a support sleeve that supports the valve stem, and a support member fixed to the yoke,
The support sleeve has a fitting sleeve that fits on the inner periphery thereof, and the operation member is attached to the valve stem via the fitting sleeve, The outer peripheral portion has a moving male screw portion, the support sleeve has an inner peripheral portion having a fastening female screw portion, and the fitting sleeve is formed on the inner peripheral portion, and the moving male screw portion has A moving female screw portion that is screw-coupled; and a fastening male screw portion that is formed on the outer peripheral portion and is screw-coupled to the fastening female screw portion, and is rotated by the operation member; The valve device is a multi-threaded screw in a reverse screw direction, wherein the screw portion and the moving male screw portion have a larger number of threads than the female fastening screw portion and the male screw portion for fastening.

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