JP2652598B2 - valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve, and more particularly to a valve capable of performing opening / closing operation and maintenance / inspection of the valve in a short time.

[0002]

2. Description of the Related Art Conventionally, opening and closing operations of a valve are generally performed by a handle wheel attached to a valve stem. Further, the conventional valve has a large rotation resistance of the valve stem due to the characteristics of the sealing means, and there is no valve which opens and closes the valve using simple power means. By the way, the operating method using the above-mentioned steering wheel vehicle does not cause any particular problem in ordinary equipment using a small number of valves, but in particular, the scram function system of the control rod driving hydraulic unit in the reactor containment vessel in the BWR type nuclear power plant. Many valves, such as the HCU valve used in
In a plant or the like having a unit / plant, it takes a very long time to open and close it, and there is a problem in terms of work efficiency. In addition, in the case of the above-mentioned nuclear power plant, a long-time operation leads to an increase in an exposure dose, and there is a problem in the health of workers.

On the other hand, maintenance / inspection of valves is time-consuming even by itself. Particularly, the HCU valve of the above-mentioned nuclear power plant is arranged in several stages in parallel in a narrow place in a reactor containment vessel. Workability is poor,
It was difficult to disassemble and assemble the valve on site for inspection.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a valve which can easily open and close the valve and perform maintenance and inspection in a short time.

[0005]

According to the first aspect of the present invention, there is provided a valve stem having a valve body disposed at a lower end portion and a valve cover, which can be separated from a valve box in an integrated state. In this manner, a handlebar is provided in which a valve lid is fixed to a valve box with a valve lid fixing bolt, and a cutout is formed above a valve stem for directly operating the valve lid fixing bolt from above using a tool such as a box spanner. In addition, a gist is provided at the upper end of the valve stem for directly operating the valve stem with a hand-held power tool such as a torque control driver.
Further, the second invention provides an O-ring and a polytetrafluoroethylene V-shaped seal as a means for sealing the valve stem of the valve of the first invention.
The gist is that packing is used.

[0006]

The valve of the first invention can open and close the valve by rotating the valve stem by directly connecting a hand-held power tool such as a torque control driver to a joint provided at the upper end of the valve stem. At the same time, by operating the valve cover fixing bolt from above, the valve rod and the valve cover having the valve element disposed at the lower end can be separated from the valve box in an integrated state to perform maintenance and inspection of the valve. Further, the valve of the second invention is provided with the first valve.
O with low friction as sealing means for the valve stem of the valve of the invention
When using a ring and a V-pack made of polytetrafluoroethylene, a hand-held power tool such as a torque control driver is directly connected to the joint provided at the upper end of the valve stem, and the valve stem is rotated to open and close the valve. The rotation resistance of the valve stem can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. In the present embodiment, the present invention is applied to a gate valve. However, the present invention is not limited to this, and is applicable to valves of other uses and types such as a ball valve and an angle valve. The valve box 1 has a connection port for plant piping, etc. and wear resistance.
The valve case 1 has a valve seat 3 coated with a corrosion-resistant alloy metal.
2 having a valve stem 5 and the like via a gasket 9 at the top of the valve
Is fixed with four valve cover fixing bolts 17 to form a valve.

A through hole is formed in the valve cover 2 for inserting the valve rod 5 in the axial direction thereof. A peripheral groove is formed in the through hole, and an O-ring 10a and a A backup ring 10b made of fluoroethylene and a V-packing 11 made of polytetrafluoroethylene are provided. Further, the valve cover 2 is provided with four through holes 2a through which the valve cover fixing bolts 17 are inserted, and a ground flange 13 holding a ground 12 for pressing the V-packing 11 from above with a relatively low pressure. Two sets of through holes 2b through which the pins 15 of the hinge bolts 14 to be fixed are inserted are formed. In addition, 1
Reference numeral 6 denotes a hexagon nut screwed with the hinge bolt 14. Further, the valve cover 2 is configured so that the yoke sleeve 6 for raising and lowering the valve stem 5 by rotating the valve stem 5 on the upper part thereof is pressed and held by the yoke nut 8 via the washer 19. In the present embodiment, the O-ring 10a having small friction, the backup ring 10b made of polytetrafluoroethylene, and the V-packing 11 made of polytetrafluoroethylene are used in combination as the seal member, but the present invention is not limited to this. It is also possible to use the V packing 11 alone or to use a sealing material made of another material.

A valve stem 5 inserted in a through hole provided in the axial direction of the valve cover 2 has a valve body 4 having a wear-resistant and corrosion-resistant alloy embossed at its lower end, and a lower intermediate portion thereof. O-ring 1
A hard chrome-plated thick shaft portion that slides with a seal member made of Oa and V packing 11 has a male screw screwed into the yoke sleeve 6 in the middle upper portion, and a square hole is formed in the upper portion. The handle wheel 7 is attached with a handle nut 18. A bottomed hole is formed at the upper end of the valve stem 5, and a joint 20 for directly operating the valve stem 5 with a hand-held power tool such as a torque control driver is inserted into the bottomed hole and fixed with a spring pin 21. In addition, the shape of the joint 20 is not limited to the illustrated one, and can be changed according to a hand-held power tool such as a spline shape.

A notch 7a is formed in a part of the handle wheel 7 so that the valve cover fixing bolt 17 located below the handle wheel 7 can be directly operated from above through a tool such as a box spanner through the notch 7a. .

Hereinafter, a method of using the above-described valve will be described. When the valve is opened and closed, a hand-held power tool such as a torque control driver is directly connected to a joint 20 provided at the upper end of the valve stem 5 to rotate the valve stem. When a specific valve is operated independently, it can be performed by rotating a steering wheel 7 attached to a valve stem. When performing maintenance and inspection of the valve, the valve cover fixing bolt 17 located below the handle wheel 7 is directly operated from above through a notch 7a provided in the handle wheel 7 with a tool such as a box spanner from the valve box 1. By separating the valve lid 2 in a state where the valve stem 5 and the like are integrated, the separated valve lid 2 can be easily disassembled and inspected on the spot, and the assembled valve lid 2 can be easily assembled after the inspection. Can be mounted on the valve box 1.

[0012]

According to the valve of the first aspect of the present invention, a joint for directly operating the valve stem with a hand-held power tool such as a torque control driver is provided at the upper end of the valve stem to which the steering wheel is attached. The valve opening / closing operation in a plant having a large number of valves can be performed in a short time, and in particular, when applied to an HCU valve in a nuclear power plant, the exposure dose to workers can be kept low.
In addition, a notch is provided in the handle wheel of the valve for directly operating the valve cover fixing bolt located below the handle wheel from above with a tool such as a box spanner. The valve stem and valve cover with the valve element disposed in the part can be separated from the valve box in an integrated state, and maintenance and inspection of the valve can be performed easily and in a short time. When applied to the HCU valve of the plant, the exposure dose to the worker can be kept low. According to the valve of the second aspect of the present invention, since the O-ring with small friction and the V-packing made of polytetrafluoroethylene are used as the sealing means for the valve stem of the valve, the rotational resistance is small and the power control tool such as a torque control driver is used. Direct operation of the valve stem can be performed more smoothly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a valve of the present invention.

FIG. 2 is a view showing a valve lid of the valve.

FIG. 3 is a longitudinal sectional view showing a sealing means of a valve stem of a valve.

FIG. 4 is a view showing a steering wheel of a valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve lid 3 Valve seat 4 Valve body 5 Valve rod 7 Handle wheel 7a Notch 10a O-ring 11 V packing 17 Valve lid fixing bolt 20 Joint 21 Spring pin

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kiyohiro Otaniuchi 127-28, Ogata-cho, Okuma-machi, Futaba-gun, Fukushima Prefecture (72) Inventor: Hiroshi Nakamura 21-12 Heights, 21-12 Hiratsato-cho, Iwaki City, Fukushima Prefecture -182576 (JP, U) Japanese Utility Model Showa 57-117479 (JP, U) Japanese Utility Model Utility Model 53-38896 (JP, Y2)

Claims (2)

(57) [Claims] 1. A valve box (1) in which a valve stem (5) having a valve body (4) disposed at a lower end thereof and a valve cover (2) are integrated.
The valve cover (2) is fixed to the valve box (1) by a valve cover fixing bolt (17) so that the valve cover (2) can be separated from the valve stem (5). A handle wheel (7) having a notch (7a) for direct operation with a tool such as a tool is provided, and the valve stem (5) is attached to the upper end of the valve stem (5) by hand-held power such as a torque control driver. A valve provided with a joint (20) for direct operation by a tool. 2. The valve according to claim 1, wherein an O-ring (10a) and a V-packing (11) made of polytetrafluoroethylene are used as sealing means for the valve stem (5).