JPH10169796A - Partition valve with fixed opening holding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide proper flow management by constraining a valve rod not to be rotatable when a valve is held at a preset position and positively holding the valve at a preset position even when the valve is oscillated with extrinsic factors including the pulsation of fluid and the vibration of a piping system. SOLUTION: In the condition that a valve is held at a full-opened position, at a fully-closed position or at an intermediate opening, an engagement clutch 13 formed by engaging a pair of teeth 6B with ring gear teeth 11A is turned on by energizing a spring 12. A valve rod 2 is constrained not to be rotatable, an opening/closing operation handle is fitted to the sectionally polygonal head 11B of a movable cap 11 and the movable cap 11 is moved down against the energization of the spring 12 to turn the engagement clutch 13 off for opening/ closing the valve elevated by the positive and reverse rotation of the operation handle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve provided with a constant opening maintaining mechanism.

[0002]

2. Description of the Related Art A gate valve is, as shown in FIGS.
A valve provided with a valve box 1, a valve stem 2, and a valve body 3, the valve body 3 having an axis C 2 intersecting with the axis C 1 of the valve box 1 and being detachably fixed to a valve body mounting inlet 1 A of the valve box 1. The box cap 4 is suspended freely around the axis. The valve body 3 moves up and down (moves forward and backward) in the valve box 1 in accordance with the forward and reverse rotation of the valve stem 2 so that the valve is opened or closed. Specifically, a flange 2 formed near the upper end of the valve stem 2
The lower surface of A is rotatably supported by a thrust bearing member 5 disposed on the peripheral upper surface of the upper end opening 4A of the valve box cap 4, and the shaft portion 2B above the flange portion 2A is attached to and detached from the upper side of the valve box cap 4. The packing box 6 is rotatably sealed in the packing box 6 by a bearing bush 7 and seal rings 8 and 8 made of an elastic material. Is formed with a head 2C having a polygonal cross section. On the other hand, a lead screw (trapezoidal male screw) 2D is formed below the flange 2A over the lower end, and a female screw piece 9 screwed to the lead screw 2D is incorporated in the upper end of the valve body 3. Accordingly, the box spanner formed at the lower end of the opening / closing operation handle (not shown) is fitted to the head 2C having a polygonal cross section or the cap 14 fixed to the head 2C having a polygonal cross section. By rotating the operation handle in the forward and reverse directions,
The valve body 3 moves up and down along the guide member 10 and is held in a fully open state in FIG. 3, a fully closed state in FIG. 4, or an intermediate opening (not shown).

However, in the conventional gate valve described above, even if the valve body 3 is held at a predetermined position such as a fully opened / closed state or an intermediate opening degree, the valve body 3 is caused by external factors such as fluid pulsation and vibration of a piping system. Swings, this swing is transmitted to the valve rod 2 to rotate it, and there is a risk that the holding position of the valve body 3 may fluctuate, which has a drawback that proper flow rate management is hindered.

[0004]

That is, in the conventional gate valve, even if the valve body is held at a predetermined position, if the valve body swings due to an external factor such as fluid pulsation or vibration of a piping system, the swing of the valve body is increased. The movement is transmitted to the valve rod to rotate the valve body, and there is a possibility that the holding position of the valve body may fluctuate, which has a drawback that proper flow rate management is hindered. In view of the above, according to the present invention, when the valve body is held at a predetermined position, the valve rod is restrained so as not to rotate, and even if the valve body oscillates due to external factors such as fluid pulsation and piping system vibration. Even so, it is an object of the present invention to provide a gate valve that can hold a valve body at a predetermined position and perform appropriate flow rate management.

[0005]

In order to achieve the above object, the present invention provides a valve in which a valve stem having an axis crossing an axis of a valve box is detachably fixed to a valve body inlet of the valve box. A valve cap is provided which is freely hung around a shaft in a box cap, and which is opened and closed by moving forward and backward in the valve box with forward and reverse rotation of the valve stem. In a gate valve that projects outward through a packing box detachably attached to the outside of the box cap, a movable cap is connected to the head so as to be able to simultaneously rotate and move in and out in the inward and outward directions,
A spring for biasing the movable cap to the outside is provided, and an outward annular concave and convex surface formed on an outer peripheral portion of the movable cap, and the valve box, the valve box cap, and the packing box. An engaging clutch is constituted by an inwardly protruding and recessed portion formed at an end portion of the arm extending to a position facing the outwardly protruding annular concavo-convex surface. The portions are meshed with each other by the bias of the spring, and the mesh is released by the inward movement of the movable cap against the bias of the spring.

According to the present invention, when the valve body is held at a predetermined position such as full open / full close or intermediate opening, the annular uneven surface of the meshing clutch and the uneven portion are meshed with each other by the bias of the spring. Therefore, the valve stem is restrained from rotating.
In addition, the operation handle for opening and closing is fitted to the movable cap,
By moving the movable cap inward against the bias of the spring, the engagement between the annular uneven surface of the meshing clutch and the uneven portion is released, and in this state, the operating handle for opening and closing is rotated in the forward and reverse directions. Thereby, the valve element can be moved forward and backward.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention. The structure of the valve box, the structure of the valve body, and the connection structure between the valve rod and the valve body are shown in FIGS.
Therefore, the illustration is omitted, and the same or corresponding parts as in the conventional example are denoted by the same reference numerals and described. 1, a lower surface of a flange portion 2A formed near an upper end portion of a valve stem 2 is rotatably supported by a thrust bearing member 5 disposed on a peripheral upper surface of an upper end opening 4A of a valve box cap 4, and the flange portion 2A is provided. The upper shaft portion 2B penetrates a packing box 6 detachably attached to the upper side of the valve box cap 4 and protrudes outward. In the packing box 6, a bearing bush 7 and a seal ring 8 made of an elastic material are used. 8, a head 2C having a polygonal cross section is formed above the shaft portion 2B.

On the other hand, a movable cap 11 is externally fitted on the upper side of the head 2C so as to be able to rotate simultaneously and move in and out in the inward and outward directions, and the movable cap 11 is placed on the upper side in a space between the movable cap 11 and the head 2C. A biasing spring 12 is provided. The outer periphery of the movable cap 11 is formed in a circular ring shape, and an upward ring gear-shaped tooth portion 11A is formed on the upper surface of the ring portion to make the upper surface of the ring portion uneven.

On the other hand, a pair of arms 6A, 6A is provided from the packing box 6 to a position facing the upwardly facing ring gear-shaped tooth portion 11A.
A is extended, and a plurality of downwardly-facing teeth 6B are formed at each of the distal ends of the arms 6A, 6A.
The tips of A and 6A are concave and convex portions facing downward, and a pair of a plurality of teeth 6B and a ring gear-shaped tooth 11A constitute a meshing clutch 13. This mesh clutch 13
Is a pair of a plurality of tooth portions 6B
And the ring gear-shaped teeth 11A are engaged with each other, so that the clutch is turned on.
By moving 1 downward, the meshing is released and the state becomes OFF.

In the above configuration, the valve body 3 is held at the fully open position as shown in FIG. 3, the valve body 3 is held at the fully closed position as shown in FIG. When the valve body 3 is held at the opening degree, as shown in FIG.
The pair of teeth 6B and the ring gear-shaped teeth 11A mesh with each other to restrain the valve stem 2 from rotating. Therefore, even if the valve body 3 oscillates due to external factors such as fluid pulsation or vibration of the piping system, the valve body 3 can be reliably held at a predetermined position and proper flow rate management can be performed. Also,
As shown in FIG. 2, an operation handle 15 for opening and closing is fitted to the polygonal cross-section head 11 </ b> B of the movable cap 11, and the movable cap 11 is moved downward against the bias of the spring 12. A pair of teeth 6 of the dog clutch 13
B is disengaged from the ring gear-shaped teeth 11A, and in this state, by rotating the opening / closing operation handle 15 in the forward and reverse directions, the valve body 3 can be moved up and down (moving forward and backward) to open and close.

In the above embodiment, an upward ring gear-shaped tooth portion 11A formed on the outer peripheral portion of the movable cap 11;
The meshing clutch 13 is engaged with a plurality of downward teeth 6B formed at the distal ends of a pair of arms 6A, 6A extending from the packing box 6 to a position facing the upward ring gear teeth 11A. Although a pair of arms 6A, 6A extend from the valve box 1 to a position facing the upward ring gear-shaped teeth 11A, a plurality of downward teeth 6B are provided at each of the distal ends of these arms 6A, 6A. And the meshing clutch 13 may be constituted by the plurality of teeth 6B and the upward ring gear-shaped teeth 11A formed on the outer periphery of the movable cap 11. Further, a pair of arms 6A, 6A extend from the valve case cap 4 to a position facing the upward ring gear teeth 11A, and a plurality of downward teeth 6B are formed at each of the distal ends of these arms 6A, 6A. The plurality of teeth 6B and the upward ring gear-shaped teeth 11A formed on the outer periphery of the movable cap 11 engage the clutch 1
3 may be configured. Further, the arm 6A is not limited to the pair described in the above embodiment,
There may be more than one. However, three or more arms 6A
If the arm 6 is provided, these arms 6
A must be detachably fixed to the packing box 6, the valve box 1, or the valve box cap 4.

[0012]

As described above, according to the present invention, the valve body is held at the fully open position, the valve body is held at the fully closed position, or the valve body is held at an intermediate opening degree. In this state, the uneven portion of the meshing clutch and the annular uneven surface can be engaged with each other by the bias of the spring to restrain the valve stem from rotating, so that even if external factors such as fluid pulsation or vibration of the piping system occur, Even if the valve element oscillates, the valve element can be reliably held at a predetermined position and proper flow rate management can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an ON state of a dog clutch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the dog clutch according to an embodiment of the present invention in an OFF state.

FIG. 3 is a half sectional vertical front view showing a conventional valve open state.

FIG. 4 is a half sectional vertical side view showing a conventional valve closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 1A Valve body mounting inlet 2 Valve stem 2A Valve stem head 3 Valve body 4 Valve box cap 6 Packing box 6A Arm 6B Plural tooth parts (irregular parts) 11 Movable cap 11A Ring-shaped tooth part (annular irregular surface) 12) Spring 13 Mesh clutch C1 Valve box axis C2 Valve stem axis

Claims (1)

[Claims] A valve stem having an axis intersecting with the axis of a valve box is hung freely around a shaft by a valve box cap detachably fixed to a valve body inlet of the valve box. A valve body that moves forward and backward in the valve box with forward and reverse rotation of the rod to open and close, and a head of the valve rod penetrates a packing box detachably attached to the outside of the valve box cap. A movable cap is connected to the head so as to be able to rotate simultaneously and move in and out in an outward direction,
A spring for biasing the movable cap to the outside is provided, and an outward annular concave and convex surface formed on an outer peripheral portion of the movable cap, and the valve box, the valve box cap, and the packing box. An engaging clutch is constituted by an inwardly protruding and recessed portion formed at an end portion of the arm extending to a position facing the outwardly protruding annular concavo-convex surface. Wherein the portions are meshed with each other by the bias of the spring, and the mesh is released by the inward movement of the movable cap against the bias of the spring. Gate valve with holding mechanism.