JP3308290B2 - Valve locking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for a valve, and more particularly to a lock mechanism for a valve which does not open and close during normal operation, such as a pressure equalizing valve for a manifold valve.

[0002]

2. Description of the Related Art FIG. 10 is a schematic front view showing an example of a conventional valve as a background of the present invention. This valve 1
The main body 2 is included. A passage 3 extending in the lateral direction and having two steps is formed in the main body 2. A valve seat 4 is formed at the center of the passage 3. Further, a stem 5 is provided on the main body 2 above the valve seat 4 so as to extend in a vertical direction. A ground nut 6 is screwed into the upper part of the main body 2. Then, the lower part of the stem 5 is screwed into the main body 2. Therefore, the stem 5 can be displaced up and down by rotating it. Also, at the lower end of the stem 5,
A valve 7 is formed. Further, a handle 8 is fixed to an upper end of the stem 5 with a nut 9.

[0003] In this valve 1, by rotating the handle 8, the valve 7 is displaced up and down together with the stem 5,
The passage 3 is opened and closed by opening and closing between the valve 7 and the valve seat 4.

[0004]

For example, a pressure equalizing valve of a manifold valve is normally closed except when operating a valve after piping. However, the above-described conventional valve has only a function of operating the valve to open or close and a function of sealing, but does not have a lock mechanism and cannot display the open or closed state of the valve. Was. for that reason,
Inexperienced people may accidentally open such a valve that should be normally closed. In such a case, instruments such as a differential pressure oscillator do not serve any purpose. Such an operation error can occur not only in a normally closed valve but also in a valve which should be normally opened or intermediately opened.

SUMMARY OF THE INVENTION It is, therefore, a primary object of the present invention to provide a valve locking mechanism that can lock a valve in an open or closed state and display the state.

[0006]

According to the present invention, there is provided a stem for opening and closing a valve, a gland nut attached to an intermediate portion of the stem for holding a gland packing, and a handle fixed to an end of the stem. A ring attached to the outer peripheral side of the gland nut, a screw hole penetrating from the outer peripheral side to the inner peripheral side of the ring, and one main surface of the ring to the other main side. Two holes penetrating toward the surface, a screw for fixing the ring to the outer peripheral side of the gland nut by screwing into a screw hole of the ring, and two holes of the ring so as to straddle the handle spoke of the handle. A locking mechanism for the valve, including a stopper passed through the valve.

[0007]

The handle is locked by passing the stopper through the two holes of the ring so as to straddle the handle spoke.

[0008]

According to the present invention, the valve can be locked in the open or closed state. Therefore, even a person who is inexperienced, for example, is unlikely to accidentally open a normally closed valve. Also, if the stoppers are color-coded to correspond to the open or closed state, it is possible to display in what state the valve is locked.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0010]

FIG. 1 is a schematic front view showing an embodiment of a valve as a background of the present invention. This valve 10 has a body 1
2 inclusive. In the main body 12, a passage 14 for passing a fluid such as water is formed. This passage 14 is provided in the main body 1
2, an inlet passage 16a extending from one side to the center, a central passage 16b communicating with the inlet passage 16a at the center of the main body 12, and extending vertically, and a main body 12 extending from the upper part of the central passage 16b.
And an outlet passage 16c extending to the other side. An opening 18 is formed above the central passage 16b. An internal thread is formed on the inner peripheral side surface of the opening 18. A valve seat 20 is formed above the central passage 16b so as to rise from the inner surface of the main body 12.

Further, a lid 22 is screwed into the opening 18 of the main body 12. A through hole 24 communicating with the central passage 16b is formed vertically in the lid 22. An internal thread 26 is formed on the inner peripheral surface below the through hole 24. A rod-shaped stem 28 is inserted into the through hole 24. An external thread 30 is formed at a lower portion of the stem 28, and the external thread 30 of the stem 28 is
Screwed. Therefore, by rotating the stem 28, the stem 28 moves up and down. Further, a valve 32 is formed at the lower end of the stem 28. The valve 32 is formed so as to be in close contact with the valve seat 20.

At the upper end of the stem 28, a handle 34 as shown in FIG. Therefore,
By rotating the handle 34, the stem 28 moves up and down, and the valve 32 can be brought into or out of contact with the valve seat 20. Then, the valve 32 is connected to the valve seat 20.
, The passage 14 is blocked and fluid is shut off, and the valve 3
2 can be moved away from the valve seat 20 to allow fluid to flow from the inlet passage 16a through the central passage 16b to the outlet passage 16c.

A gland packing 38 is provided at the center of the stem 28, and the space between the stem 28 and the lid 22 is sealed by the gland packing 38. Note that the gland packing 38 has a ferrule 4
0 is provided, and the upper part thereof is pressed by the packing presser 42. Further, the packing presser 42 is pressed and fixed by a ground nut 44 screwed onto the upper portion of the lid 22.

The handle 34 includes handle spokes 46. A U-shaped stopper 48 as shown in FIG. 3 is attached to the handle spoke 46 so as to straddle it. Further, an annular ring 50 is fixed to the outer peripheral surface of the ground nut 44 by a hexagon socket set screw 52.

FIG. 4 is a plan view showing the ring 50, FIG. 5 is a cross-sectional view taken along line VV of FIG. 4, and FIG.
7 is a cross-sectional view taken along line VI-VI, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. A circular screw hole 54 is formed in the ring 50 from the outer surface to the inner surface, and a hexagon socket set screw 52 is screwed into the screw hole 54. Two holes 56a and 56b are formed from one main surface of the ring 50 to the other main surface. This 2
The stopper 48 is passed through the two holes 56a and 56b.

FIG. 8 is a front view showing an example of a hexagon socket set screw 52, and FIG. 9 is a side view thereof. The hexagon socket set screw 52 has a substantially hexagonal column hole 58 and is formed in a columnar shape.

In this valve 10, after the valve 10 is fully closed, the position of the ring 50
The two holes 56a and 56b are aligned. Then, the ring 50 is fixed by screwing the hexagon socket set screw 52 into the screw hole 54 of the ring 50. Thereafter, the stopper 48 is passed through the two holes 56a and 56b of the ring 50 so as to straddle the handle spoke 46.

After the valve 10 is fully closed in this way, the handle 34 is locked by the stopper 48. Therefore, even a person who is inexperienced, for example, is unlikely to accidentally open a normally closed valve.

In this embodiment, a normally closed valve has been described. However, the present invention can be applied not only to a normally closed valve but also to a normally open or intermediate open valve. In this case, for example, by color-coding the stopper 48 to correspond to the open or closed state, it is possible to display in what state the valve is locked.

[Brief description of the drawings]

FIG. 1 is an illustrative front view showing one embodiment of a valve as a background of the present invention.

FIG. 2 is a plan view showing a handle.

FIG. 3 is a front view showing a stopper.

FIG. 4 is a plan view showing a ring.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 4;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 4;

FIG. 8 is a front view showing an example of a hexagon socket set screw.

FIG. 9 is a side view of FIG.

FIG. 10 is an illustrative front view showing an example of a conventional valve as a background of the present invention.

[Explanation of symbols]

 Reference Signs List 10 valve 28 stem 32 valve 34 handle 38 gland packing 44 gland nut 46 handle spoke 48 stopper 50 ring 52 hexagon socket set screw 54 screw hole 56a, 56b hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-258276 (JP, A) JP-A-59-15875 (JP, U) JP-A-51-135821 (JP, U) JP-A-56-158 30679 (JP, U) Fully open sho 55-150221 (JP, U) Fully open sho 59-123774 (JP, U) Fully open sho 59-123773 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F16K 35/00-35/16 F16K 31/44-31/60

Claims (1)

(57) [Claims] 1. A valve having a stem for opening and closing a valve, a gland nut attached to an intermediate portion of the stem for holding a gland packing, and a handle fixed to an end of the stem. A lock mechanism for a valve, a ring attached to an outer peripheral side of the gland nut, a screw hole penetrating from an outer peripheral side to an inner peripheral side of the ring, and penetrating from one main surface to the other main surface of the ring A screw for fixing the ring to the outer peripheral side of the ground nut by screwing into the screw hole of the ring; and the two holes of the ring so as to straddle a handle spoke of the handle. A locking mechanism for the valve, including a stopper passed through the hole.