JP2002188752A - Valve operation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve operation machine capable of preventing an internal pressure from being generated in the operation machine even when a gland of a valve body is in a failed condition. SOLUTION: The operation machine 21 is attached to a valve rod 38 projected from a boss part 37 of the valve body. A casing 22 of the operation machine 21 is attached to a flange 40 of a boss part 30 through a basket 42 and a through hole 45 penetrating over the inside from the outside is provided on the casing 22. A pressure relief valve 46 is attached to the through hole 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve operating device, and more particularly to a technique for opening and closing a valve body of a butterfly valve or the like buried underground.

[0002]

2. Description of the Related Art Conventionally, when a butterfly valve or the like is buried in the soil, it is necessary to pay attention to the possibility that external sewage infiltrates the operating device. Although unification can be considered, there is a problem that the cost increases.

For this reason, as shown in FIGS. 4 and 5, the operating device 1 is provided with a butterfly for the purpose of preventing corrosion of an exposed portion of a valve stem, preventing invasion of external waste water due to poor sealing of a gland portion, and reducing the height of burying. The valve 2 is mounted on the flange 4 of the boss 3 via a thin dedicated spacer 5. Alternatively, as shown in FIG. 6, the dedicated spacer 5 is removed, and the operating device 1 is directly mounted on the flange 4 of the boss 3 of the butterfly valve 2.

The operating device 1 has an output shaft carrier 8 connected to a valve rod 7 inside a casing 6, and a sleeve 11 with a cover 10 attached and fixed to the upper part of the casing 6 with bolts 9.
, The input shaft 12 is rotatably held, and a gear train having a predetermined reduction ratio is arranged between the input shaft 12 and the output shaft carrier 8.

[0005] An O-ring case 13 is provided at the upper end of the flange 4.
And the O-ring 14 arranged in the O-ring case 13
Seals between the internal region of the boss 3 and the internal region of the casing 6 of the operating device 1. Further, a gland (not shown) arranged inside the butterfly valve 2 seals the space between the inside of the valve box and the inside of the boss 3.

[0006]

However, the defect of the O-ring 14 arranged in the O-ring case 13 and the butterfly valve 2
When the internal pressure of the valve box acts on the inside of the casing 6 of the operating device 1 due to the failure of the gland, a differential pressure from the outside air is generated near the output shaft carrier 8 as shown by arrows in FIGS. This causes a malfunction of the machine 1. Also,
In the worst case, the operating device 1 may be damaged by the pressure.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a valve operating device that can prevent internal pressure from being generated in the operating device even when a gland of a valve body is defective.

[0008]

According to a first aspect of the present invention, there is provided a valve operating device mounted on a valve stem protruding from a boss of a valve body. The casing of the operating device is mounted on a flange of a boss portion via a gasket, a through-hole penetrating the inside and outside of the casing is provided, and a pressure relief valve is mounted in the through-hole.

With the above construction, the valve stem protruding from the boss portion is covered with the casing of the operating device, and the gasket is interposed between the casing of the operating device and the flange of the boss portion. The ground inside is not exposed to the outside, external sewage does not enter the equipment, and the stand is not used, so that the buried height is low.

When the internal pressure of the valve box acts on the inside of the casing of the operating device due to the failure of the gland in the valve body and the pressure reaches a predetermined pressure, the pressure relief valve operates to release the internal pressure and release the pressure. As a result, the operation device can be prevented from being broken or malfunctioning.

A valve operating device according to a second aspect of the present invention is an operating device mounted on a valve stem protruding from a boss portion of a valve body, wherein a casing of the operating device is mounted on a flange of the boss portion via a spacer. A gasket is interposed between the casing and the spacer, and between the spacer and the flange of the boss portion, a through hole is provided in the spacer to penetrate the inside and outside, and a pressure relief valve is mounted in the through hole.

With the above structure, by interposing the spacer on which the pressure relief valve is mounted, it is possible to use the existing operating device and to operate the operating device or to damage the operating device due to the failure of the gland in the valve body. Can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The present invention can be applied to an operating device having any of a planetary gear mechanism and a hypocycloid mechanism. In this embodiment, an operating device having a planetary gear mechanism will be described.

1 and 2, the operating device 21 has a cover 23 fixedly mounted on the upper end of a casing 22 with bolts 24. The cover 23 is connected to the input shaft 2 via a sleeve 25.
6 is rotatably held. The casing 22 has an internal gear 27 formed on an upper inner surface thereof. A small-diameter portion 29 on a lower end side of an output shaft carrier 28 disposed in a lower portion is rotatably held by a bottom boss portion 30. The diameter portion 31 is rotatably held by a seat portion 32 formed at the upper end of the boss portion 30.

The output shaft carrier 28 holds a gear shaft 34 of a planetary gear 33 mounted thereon, and the planetary gear 33 meshes with both a sun gear 35 and an internal gear 27 provided on the input shaft 26. A cap 36 is attached to the upper end of the input shaft 26.

The operating device 21 has a valve stem 38 projecting from a boss 37 of a valve body (not shown) fixed to a key on the output shaft carrier 28 by a key, and a flange 39 of the casing 22 is bolted to a flange 40 of the boss 37. 41, and a gasket 42 is interposed between the flanges 39 and 40.

An O-ring case 43 is disposed at the upper end of the flange 40 of the boss 37, and a plurality of O-rings 44 disposed on the O-ring case 43 define an inner region of the boss 37 and an inner region of the casing 22 of the operating device 21. The seal is between. In addition, a gland (not shown) disposed inside the valve body (not shown) seals the space between the inside of the valve box and the inside of the boss 37.

The flange 39 of the casing 22 is provided with a through hole 45 penetrating inside and outside.
Is equipped with a pressure relief valve 46. As shown in FIG. 2, the pressure relief valve 46 is connected to the connection port 4 connected to the through hole 45.
7 and a radiation port 48, and a communication path between the connection port 47 and the radiation port 48 is opened and closed by a valve element 49 disposed inside. On the back side of the valve element 49, a spring 50 for maintaining the valve element 49 in a closed state at a predetermined pressure is disposed.

The operation of the above configuration will be described below. The driving force applied via the cap 36 rotates the input shaft 26, and the rotation of the input shaft 26 causes the sun gear 35 to rotate.
The planetary gear 33 meshes with the internal gear 27 and revolves around the axis of the input shaft 26 while rotating around the axis of the gear shaft 34.
By the revolution of 3, the output shaft carrier 28 rotates.

The valve stem 38 projecting from the boss 37 is covered with the casing 22 of the operating device 21, and a gasket 42 is interposed between the flange 39 of the casing 22 of the operating device 21 and the flange 40 of the boss 37. Therefore, the valve stem 38 and the gland in the valve main body are not exposed to the outside, external sewage does not enter the apparatus, and the burying height is reduced because the stand is not used.

When the internal pressure of the valve box acts on the inside of the casing 22 of the operating device 21 due to the failure of the gland in the valve body and the pressure reaches a predetermined pressure, the pressure relief valve 46 operates to release the internal pressure. Therefore, the operation device 21 can be prevented from being broken or malfunctioning.

FIG. 3 shows another embodiment of the present invention. In FIG. 3, the flange 3 of the casing 22 of the operating device 21 is shown.
A spacer 51 is interposed between the casing 9 and the flange 40 of the boss 37, and a gasket 42 is interposed between the casing 22 and the spacer 51 and between the spacer 51 and the flange 40 of the boss 37, respectively. I have. The spacer 51 is provided with a through hole 52 penetrating inside and outside, and the through hole 5 is formed.
2 is equipped with a pressure relief valve 46.

[0023]

As described above, according to the present invention, when the internal pressure of the valve box acts on the inside of the casing of the operating device due to the failure of the gland in the valve body and the pressure reaches a predetermined pressure, the pressure is released. Since the valve is operated to release the internal pressure and reduce the pressure, it is possible to prevent the operation device from being broken or malfunctioning. Further, by interposing the spacer equipped with the pressure relief valve, it is possible to prevent malfunction of the operating device and damage to the operating device due to a defective gland in the valve body while using the existing operating device. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing an operating device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a pressure relief valve of the operating device.

FIG. 3 is a cross-sectional view of an operating device according to another embodiment of the present invention.

FIG. 4 is a side view showing a conventional operating device.

FIG. 5 is a sectional view of the operating device.

FIG. 6 is a cross-sectional view of another conventional operating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Operating device 22 Casing 23 Cover 24 Bolt 25 Sleeve part 26 Input shaft 27 Internal gear 28 Output shaft carrier 29 Small diameter part 30 Boss part 31 Medium diameter part 32 Seating part 33 Planetary gear 34 Gear shaft 35 Sun gear 36 Cap 37 Boss part 38 Valve Rod 39 Flange 40 Flange 41 Bolt 42 Gasket 43 O-ring case 44 O-ring 45 Through hole 46 Pressure relief valve 47 Connection port 48 Dissipation port 49 Valve body 50 Spring spring 51 Spacer 52 Through hole

Claims (2)

[Claims] An operating device mounted on a valve stem protruding from a boss portion of a valve body, wherein a casing of the operating device is mounted on a flange of the boss portion via a gasket, and a through hole penetrating the casing from inside to outside. An operating device for a valve, wherein a pressure relief valve is mounted in the through hole. 2. An operating device mounted on a valve stem protruding from a boss portion of a valve body, wherein a casing of the operating device is mounted on a flange of the boss portion via a spacer, and between the casing and the spacer and between the spacer and the boss. A valve operating device, comprising a gasket interposed between flanges of a portion, a through hole penetrating the spacer inside and outside, and a pressure relief valve mounted in the through hole.