JPH10196842A - Locking device for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the degree of fitting-in for one wedge body by pressing one wedge body by a lock bolt provided in its side for pressure-connecting first and second wedge bodies fitted between first and second engaging parts to each other. SOLUTION: A flange part 3 is provided to be fitted around a valve shaft 2, a locking part 5 having a recessed part 4 for placing the flange part 3 is disposed and the movement of the valve shaft 2 is suppressed. Wedge bodies 6 and 7 are fitted between the flange part 3 and the lower surface 5a of the locking part 5, and a wing bolt 11 for pressing the backside 7b of the wedge body 7 is provided by being supported on the bolt supporting part 12 of the flange part 3. A stopper 13 for receiving the wedge body 6 against the pressing force of the wing bolt 11 is provided in the flange part 3, the wedge body 7 is pressure-contacted with the wedge body 6 by the pressing force of the wing bolt 11 and the valve shaft 2 is held in a valve full closed position via the flange part 3. Thus, by causing the wing bolt 11 to exit and retreat, the degree of fitting-in for the wedge body 7 is easily changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve lock device in which a valve shaft extends and retracts inside and outside a valve box.

[0002]

2. Description of the Related Art In a valve such as a needle in which a valve stem extends and retracts inside and outside a valve box, as shown in FIG. 2, a flange portion 3 is provided on a valve shaft 2 located outside a valve box 1. When the valve is fully closed, a locking portion 5 having a concave portion 4 in which the flange portion 3 is fitted is arranged to suppress the movement of the valve shaft 2.

As shown in FIG. 3, a first wedge 6 is provided on the upper surface of the flange 3, and a second wedge 7 is provided between the first wedge 6 and the downward surface 5 a of the locking portion 5. And the second
A pin 8 penetrating the wedge body 7, the first wedge body 6, and the flange 3 is arranged, and the pin 8 is fixed with a lock 9, so that the valve is fully closed.

[0004]

However, in the above-mentioned conventional locking method, although the pin hole 10 is formed to be slightly larger than the diameter of the pin 8, it is determined by the degree of fitting of the second wedge body 7 and the degree thereof. The position of the valve shaft 2 is limited to a certain range depending on the diameter of the pin hole 10, and it is difficult to adjust the fully closed position of the valve.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a valve locking device capable of giving a certain degree of freedom to a fully closed position of a valve.

[0006]

In order to solve the above-mentioned problems, a valve locking device according to a first aspect of the present invention is a valve locking device in which a valve shaft extends and retracts inside and outside a valve box.
Provide an appropriate distance between the first locking portion provided on the valve shaft outside the valve box along the radial direction thereof and the side of the first locking portion which is opposite to the valve box when the valve is fully closed. First and second wedge bodies fitted between the first and second locking parts and abutting each other on the inclined surface;
A lock bolt that presses the one wedge and presses against the other wedge, and is provided at the first locking portion or the second locking portion, and receives the other wedge against the pressing force of the lock bolt. It is provided with a stopper.

According to a second aspect of the present invention, there is provided a valve locking device including a detachable cover arranged to cover a lock bolt, and a key for fixing the cover to the first locking portion. According to the above configuration, the degree of fitting of one wedge between the first locking portion and the second locking portion can be adjusted by retracting the lock bolt. The degree of freedom can be given to the restraining position and the fully closed position of the valve.

According to the second aspect of the present invention, the lock bolt is covered by the cover, and the cover is fixed to the first locking portion by the key. This does not cause a malfunction of the valve.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the valve lock device is configured substantially in the same manner as the conventional lock device described above with reference to FIGS. 2 and 3, and is externally fitted to a vertical valve shaft 2 located outside the valve box. The flange portion 3 is provided, and the locking portion 5 having the concave portion 4 into which the flange portion 3 is inserted is arranged to suppress the movement of the valve shaft 2.

A first abutment between the flange 3 and the downwardly facing surface 5a of the locking portion 5 at the inclined surfaces 6a, 7a.
The wedge body 6 and the second wedge body 7 are fitted. A wedge bolt 11 for pressing the back surface 7b of the second wedge body 7 is provided to be supported by the bolt support portion 12 of the flange portion 3, and a stopper 13 for receiving the first wedge body 6 against the pressing force of the wedge bolt 11. Is provided on the flange 3 and the butterfly bolt 11 is provided.
The second wedge body 7 is pressed against the first wedge body 6 by the pressing force, and the valve shaft 2 is held at the fully closed position of the valve via the flange 3.

A detachable cover 14 for covering the butterfly bolt 11 is disposed on the flange 3, and the protrusion 14 a formed on the cover 14 and the protrusion 3 a formed on the flange 3 are fastened by the lock 9. .

According to such a configuration, the butterfly bolt 1
Since the degree of fitting of the second wedge body 7 can be changed as appropriate by moving the 1 in and out, a certain degree of freedom can be given to the restraining position of the valve shaft 2, that is, the fully closed position of the valve.

Further, since the butterfly bolt 11 is covered with the cover 14 and the cover 14 is fixed to the flange 3 by the lock 9, the butterfly bolt 11 does not come and go due to carelessness or mischief. Malfunction can be prevented.

[0014]

As described above, according to the present invention, when the first and second wedge bodies fitted between the first locking portion and the second locking portion are pressed against each other, one of the wedges is pressed. Since the body is pressed by the lock bolt provided on the side thereof, the degree of fitting of one wedge body can be changed by adjusting the pressing force of the lock bolt, and the first locking portion is fixed. The restrained position of the valve shaft, that is, the fully closed position of the valve, can have a certain degree of freedom.

Further, since the cover arranged to cover the lock bolt is fixed to the first locking portion by a lock, erroneous operation of the valve due to carelessness or mischief can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing a valve locking device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an entire configuration of a conventional valve in which a valve shaft extends and retracts inside and outside a valve box.

FIG. 3 is a front view of an essential part for explaining a conventional valve lock device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve shaft 3 Flange part 5 Locking part 6 First wedge body 7 Second wedge body 6a, 7a Inclined surface 9 Key 11 Wing bolt 13 Stopper 14 Cover

Claims (2)

[Claims] 1. A valve locking device in which a valve shaft extends and retracts inside and outside a valve box, wherein a first locking portion is provided on a valve shaft outside the valve box so as to protrude in a radial direction thereof, and a valve. First when fully closed
A second locking portion provided at an appropriate distance between a side surface of the locking portion opposite to the valve box, and a second locking portion which is fitted between the first locking portion and the second locking portion, and which are mutually inclined on the inclined surface. First and second wedge bodies that come into contact with each other, a lock bolt that presses the one wedge body and presses against the other wedge body, and a lock bolt that is provided at the first or second locking portion. A lock device for a valve, comprising: a stopper for receiving the other wedge body against a pressing force. 2. The valve locking device according to claim 1, further comprising a detachable cover arranged to cover the lock bolt, and a key for fixing the cover to the first locking portion.