JPH0534391Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a jig for preventing erroneous operation of valves, particularly ball valves, installed in fluid transport lines in chemical factories and the like.

<Prior art> In chemical factories, etc., fluid is often supplied to equipment all the time, or only when it is particularly needed, and valves, especially ball valves, are used in piping.
Keep valves open or closed at all times. If you mistakenly operate a valve that is maintained in a steady state due to a misunderstanding, it may cause a serious disaster, and it is necessary to strictly prevent erroneous operation.As a way to do this, a display board prohibiting operation should be placed near the valve. Generally, a jig for attaching or locking the valve is tied to the valve with a rope, and a blind plate is also inserted into the valve end flange when the valve is kept closed at all times. However, display boards cannot completely prevent misunderstandings, and methods such as tying ropes or inserting blind boards may not be possible depending on the piping situation.
Even if it were possible, there is a problem in that it takes a lot of effort to install.

<Problem that the invention seeks to solve> The inventors discovered that even if they mistakenly attached a valve opening/closing lever to the rotating shaft of the valve and attempted to operate it,
We came up with the idea that the above-mentioned erroneous operation could be prevented if the opening/closing shaft of the valve could not be rotated, and after much study on the structure of the mounting jig, we completed the present invention.

<Means for Solving the Problems> Thus, according to the present invention, a substantially square shape with one corner projecting outward and an opening/closing shaft fitting hole 2 provided in the center.
It consists of a metal board 1 on which a flange retaining rod 3 is installed by perforating the projecting part, and a display board hanging down from the board. When fitted to the shaft 5 in position, the locking rod is provided so as to touch the side edge 7 of the shaft holding flange 6 facing the board protrusion at the intersection of perpendicular lines drawn from the center of the valve shaft. A valve opening/closing position fixture is provided.

An embodiment of the present invention is shown in FIG. 1, where A is a front view and B is a plan view. A stainless steel substrate 1 having a substantially rectangular shape with one corner projecting outward has a square cross section in the center. A square hole corresponding to the valve opening/closing shaft is drilled with its diagonal line parallel to the upper edge of the board to form the opening/closing shaft fitting hole 2, and a stainless steel rod is inserted into the bulged corner of the board. It is planted vertically to form a flange retaining rod 3, and its position is the same when the fitting hole 2 is fitted into the shaft 5 in the open or closed position of the valve shaft shown by the broken line. It is provided so as to be in contact with the side edge 7 of the shaft holding flange 6 facing the board protrusion shown by a broken line at the intersection of a perpendicular line drawn from the center of the valve shaft, and its length is such that it can be sufficiently hooked onto the holding flange 6. It is determined.

Further, a display plate mounting hole 4 is provided at the periphery of the substrate 1. In this embodiment, two display board mounting holes are provided on each of the upper and lower edges, and one is provided on the upper right edge, but the position and number of the display board mounting holes are not limited to these.

It is preferable that the board be painted, for example, yellow, so that it is conspicuous, and for the display board, for example, characters such as "Operating strictly prohibited" and "Opening/closing prohibited" should be clearly engraved on the plastic board, and a plastic band or the like should be attached to the mounting hole of the display board. It is better to install it.

FIG. 2 shows another embodiment, in which the opening/closing shaft fitting hole is made to correspond to a type of valve in which the head of the valve opening/closing shaft is rectangular and the long side coincides with the flow direction of the fluid.

<Function> In this invention, when the fitting hole of the board is inserted into the valve opening/closing shaft, the retaining rod of the board contacts the linear side edge of the shaft holding flange at the intersection of the perpendicular lines drawn from the center of the valve shaft. If the valve opening/closing lever is attached to the opening/closing shaft and the opening/closing shaft is attempted to rotate, it cannot be rotated, so the valve is held in the open or closed state to prevent erroneous operation.

The ball valve shaft retainer flange is flat 6
Since it has a rectangular shape and is formed symmetrically with respect to the valve shaft rotation axis, even if the board is rotated 180 degrees and fitted onto the shaft, rotation is also impossible.

Furthermore, by selecting an appropriate mounting method, the direction of the bulge provided with the latching rod from the valve opening/closing shaft can be adjusted as shown in Fig. 3A, B, C, D, and E.
For example, by deciding on the fluid outflow direction,
The location of the bulge can indicate whether the fluid is flowing in the valve up, down, left or right, and if the valve is installed horizontally or vertically, and the fluid is flowing from right to left or vice versa. Alternatively, the display board 8 can be hung and attached in any case where the flow flows from top to bottom or vice versa.

<Effect of the invention> According to the invention, even if the warning on the fixture display board is ignored, the fixture board is fitted and attached to the valve shaft, so the valve opening/closing lever can be correctly attached to the valve opening/closing shaft. It is difficult to install, and even if it can be installed, it cannot be opened or closed, and it has a so-called fool-proof structure with 3 stages.
It is possible to avoid opening and closing a valve in a steady state due to erroneous operation.

Furthermore, it has a simple structure and is easy to manufacture and install, making it extremely useful for chemical factories and the like that use many ball valves of the same type and size.

[Brief explanation of the drawing]

Figures 1A and B are a front view and a plan view of an embodiment of the present invention, Figures 2A and B are front views and a plan view of another embodiment, and Figures 3A, B, C, D, and E. FIG. 2 is an explanatory diagram showing the state of use of the present invention. 1... Board, 2... Fitting hole, 3... Latching rod, 4
...Display plate mounting hole, 5...Shaft, 6...Shaft presser flange, 7...Side edge, 8...Display plate.

Claims (1)

[Scope of utility model registration request] A metal substrate 1 having a substantially square shape with one corner projecting outward, an opening/closing shaft fitting hole 2 drilled in the center, and a flange retaining rod 3 planted perpendicularly to the projecting portion; and the board. When the board is fitted to the shaft 5 in the open or closed position of the opening/closing shaft, the latching rod is located on the side of the shaft holding flange 6 facing the board protrusion. A fixture for opening and closing the valve, characterized in that it is provided so as to touch the edge 7 at the intersection of perpendicular lines drawn from the center of the valve shaft.