JPH02150583A - Opening display unit for gate valve - Google Patents

Abstract

PURPOSE:To make valve opening accurately checkable by transmitting the rotational output of an output gear attached simultaneous-rotatably to a cap, to an input shaft of a valve opening display counter, in a gate valve where the cap is crowned on a valve stem in a simultaneously rotatable manner. CONSTITUTION:A cap 3 is formed with a valve steam crowned boss part 3B at the lower part in making a flange part 3A of its coundary, and a square head 3C is formed on the upper part. A disk 4A formed with a square through hole 4a is tightly attached to the top central part of an output gear 4, fitting the square head 3C in this through hole 4a from the underside, and the output gear 4 is simultaneous-rotatably attached to the cap 3. When the cap 3 is rotated, a valve stem 2 is also rotated, and a valve body of a gate valve moves up and down, opening or closing a pipeline. On the other hand, the output gear 4 rotates simultaneously with rotation of the cap 3, and this rotation is transmitted to an input shaft 8B of a valve opening display counter 8 via a power transmission system 6 of an input spur gear 6A, bevel gears 6B, 6C, thereby rotating this input shaft, so that opening of the valve body is accurately displayed on a numerical display part 8A.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gate valve opening display device, which can be easily installed not only in newly manufactured gate valves but also in existing gate valves. This invention relates to an opening display device that can display the opening degree.

[Prior Art] It is known that conventional gate valves are provided with an opening display function at the time of manufacture, or have an opening display device attached to the reduction gear portion of the opening/closing drive mechanism.

[Problems to be Solved by the Invention] However, especially small-diameter gate valves are generally not equipped with an opening display device, and have the disadvantage that the opening degree of the valve cannot be accurately confirmed.

The present invention was made in view of these circumstances, and although it can be easily installed not only in newly manufactured gate valves but also in existing gate valves, and has an extremely simple structure, The object of the present invention is to provide a gate valve opening display device that can accurately display the valve opening.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an output gear that is rotatably attached to a cap that is rotatably mounted on a valve stem of a gate valve. The rotational output of the output gear is transmitted to the input shaft of the valve opening display counter via a power transmission system.

[Operation] According to the present invention, a manual rotary tool such as a box spanner is fitted onto the cap and rotated in forward and reverse directions to rotate the cap and valve stem to open the gate valve. In response to opening and closing, the output gear rotates in forward and reverse directions, and this rotational output is transmitted to the input shaft of the valve opening display counter via the power transmission system, operating the valve opening display counter to open the valve. Convert and display degrees as numerical values.

[Example〕 Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cross-sectional front view of the main part of the present invention. In the figure, a valve stem 2 protrudes rotatably and liquid-tightly from the upper end of the valve box IA of the gate valve 1. A cap 3 is fitted onto a head 2A having a rectangular (for example, quadrangular) cross section formed at the upper end so as to be rotatable at the same time.

The cap 3 has a flange portion 3A formed approximately in the center as a boundary, and a valve stem crowning boss portion 3B is formed in the lower part of the flange portion 3A. A cap head 3C is formed in a rectangular (for example, rectangular) shape and gradually tapers upward, and an output gear 4 is attached so as to be rotatable at the same time.

The output gear 4 is, for example, a ring gear (of course,
A disk 4A having a rectangular through hole 4a formed in the center is fixed to its two surfaces, and by fitting the rectangular cap head 3C of the cap 3 into the through hole 4a from below, , an output gear 4 is attached to the cap 3 so as to be rotatable at the same time.

The power transmission system 6 includes an input spur gear 6A that meshes with the output gear 4;
It is composed of a bevel gear 6B fixed to the lower part of the vertical shaft 7 to which the input spur gear 6A is fixed, and an output bevel gear 6C meshing orthogonally to the bevel gear 6B.
C is fixed to an input shaft 8B of a valve opening display counter 8 having a numerical display section 8A.

Output gear 4. Power transmission system 6 and valve opening display counter 8
is housed in a box 9 as shown in FIG. 2 so that the numerical display section 8A of the valve opening degree display counter 8 can be visually observed from the outside. It is attached to the valve box IA via 10.

In the above configuration, a manual rotary tool such as a box spanner is fitted onto the rectangular head 3C of the cap 3 and rotated in forward and reverse directions, and the valve stem 2 is rotated in the forward and reverse directions together with the cap 3. A valve body (not shown) of the gate valve l moves up and down to open and close the pipeline.

At the same time as the cap 3 rotates forward and backward, the output gear 4
rotates in forward and reverse directions, and this rotational output is transmitted to the input shaft 8B of the valve opening display counter 8 via the power transmission system 6.
Rotate B forward and backward. Therefore, since the amount corresponding to the opening degree of the valve body is converted into a numerical value and accurately displayed on the numerical display section 8A, the valve opening degree can be confirmed by looking at this numerical value.

The present invention has an extremely simple and compact structure consisting of an output gear 4 attached to a cap 3, a power transmission system 6, and a valve opening display counter 8, and is easily adapted to a newly manufactured gate valve l. Of course, it can be easily attached to an existing small-diameter gate valve that is not equipped with an opening degree display device to provide a valve opening degree display function.

In the above embodiment, a ring gear is used as the output gear 4, but as shown in FIG. 4, a spur gear may be used. In addition, as shown in FIG. 5, the power transmission system 6 is connected to input spur gears 6A, bevel gears 6B, 6C.
and a cable 6D, and the cable 6D is configured to be connected to the input shaft 8B of the valve opening display counter 8 so as to be rotatable at the same time, thereby displaying the valve opening numerically at a position remote from the gate valve 1. can be done.

[Effects of the Invention] As explained above, according to the present invention, the output gears are mounted so as to be rotatable at the same time on the cap that is rotatably crowned on the valve stem of the gate valve, and the rotation of the output gears is Since the output is configured to be transmitted to the input shaft of the valve opening display counter via the power transmission system, the valve opening of the gate valve can be accurately converted into a numerical value and displayed, and this can be confirmed visually. can be done. Moreover, since the structure is extremely simple and compact, it can be easily installed not only as an additional edition for newly manufactured gate valves, but also for existing small-diameter gate valves that are not equipped with an opening display device. (=
It has the advantage of being able to provide a valve opening display function.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a partial cross section of essential parts according to an embodiment of the present invention, FIG. 2 is a perspective view showing an example of a box, and FIG. 3 is a perspective view showing an example of a box.
4 is a sectional view showing another embodiment of the output gear, and FIG. 5 is a front view showing another embodiment of the power transmission system. ■...Gate valve 2...Valve stem 3...Cap 4...Output gear 6...Power transmission system 8...Valve opening display counter 8B...Input shaft Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] (1) In a gate valve in which a cap is rotatably mounted on the valve stem, an output gear is attached to the cap so as to be rotatable at the same time, and the rotational output of the output gear is transmitted to the valve opening through a power transmission system. What is claimed is: 1. A gate valve opening display device, characterized in that the signal is transmitted to an input shaft of a display counter.