JPH0443666Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a valve, such as a ball valve, which is used to open and close the flow of liquids such as water, oil, and gas, and whose valve body is rotated approximately 90 degrees. can be,
In particular, it concerns the valve shaft and its surrounding structure, and aims to provide many functions with a compact structure.

(Prior Art) Conventionally, in valves used for this type of application, such as ball valves, a tightening device for the shaft sealing packing and a stopper device for limiting the rotation range of the valve shaft are provided outside the upper cover. There is. Therefore, it is unsuitable for use in underground piping or in environments where dust and raw materials are scattered and deposited outside, as these will have a negative impact on the functions of the retightening device and stopper device mentioned above. . For this reason, it is necessary to incorporate a shaft sealing packing, a packing tightening device, and a stopper device inside the upper cover, and several ball valves with such a structure are also provided.

However, in these systems, the packing tightening device is simply a spring device, and the shaft sealing packing and bearing are incomplete. A valve with this structure has not yet been provided.

(Problems to be Solved by the Invention) The present invention has been devised in view of the above-mentioned circumstances, and is intended to solve all of the following conventional problems.

(1) The bearing is defective, causing the valve stem to be biased and the shaft sealing gasket to be damaged.

(2) The packing retightening device is simply a spring device and cannot adequately follow the wear and tear of the packing.

(3) The shaft sealing gasket is incomplete and the fluid inside the valve tends to leak.

(4) Internal parts corrode due to failure to prevent fluid from entering from the outside.

(5) The structure is complex and therefore expensive.

(Means for Solving the Problems) The present invention attempts to solve the above-mentioned conventional problems by the following means.

In other words, it is a valve that is opened and closed by rotating the valve stem approximately 90 degrees, and the valve stem is sequentially fitted with a shaft-sealing gasket and retightening of the gasket from the inside of the valve to the outside of the valve. A stopper device for limiting the rotation range of the valve stem was provided in the upper cover, and an operating connection was formed at the outer tip of the valve stem outside the upper cover. Further, as an embodiment of the present invention, the shaft sealing packing is composed of a self-sealing packing that performs a sealing action by the pressure of the fluid in the valve, and a tightening packing that performs a sealing action by tightening. Further, the self-sealing packing was provided on the inner side and the outer side of the valve from the bearing part of the valve shaft, and the tightening type packing was provided on the outer side of these.

Further, a grease injection device for injecting grease into the bearing portion was provided, and the self-sealing packing was an O-ring.

The retightening device consists of a nut screwed onto a male thread formed on the valve shaft and having a locking device, and a cylindrical gland installed between the nut and the tightening packing. A disc spring was installed between the ground and the ground.

Further, the locking device of the nut is provided with an arcuate cut groove approximately at the center in the thickness direction of the nut, and the nut is divided into two parts by the cut groove.
The two parts can be pushed apart or tightened using a screw device.

In addition, the stopper device allows a pin attached to the valve shaft to pass through the valve shaft at right angles to the axial direction to contact with a locking portion formed inside the upper cover of the valve, so that the valve shaft is approximately stopped. The valve can be opened and closed by rotating it 90 degrees. Furthermore, the pin was a cylindrical spring pin with a cutting groove provided in the axial direction of the pin.

Furthermore, the operating connection portion was formed into a prismatic shape with a substantially square cross section or a cylindrical shape with two parallel planes facing each other on the outer surface.

Further, a cylindrical bearing member was attached to the bearing portion of the valve shaft.

(Function) Since the valve of the present invention is constructed as described above,
It works as follows.

A retightening device tightens the tightening type packing to perform a sealing action, and a self-sealing packing such as an O-ring also performs a sealing action, so fluid in the body will not leak from between the valve stem and the body. This is completely prevented.

In addition, in the retightening device, a nut screwed onto a male thread formed on the valve stem tightens the tightening type packing via the gland, and the nut is equipped with a locking device. , the nut will not loosen and the fluid inside the body will not leak.

Furthermore, by installing a disc spring between the nut and the gland, it is possible to follow the wear and tear of the tightening type packing and prevent leakage.

Further, in the valve of the present invention, even if there is pressurized fluid in the body, the upper cover can be removed, so the tightening type packing can be retightened by removing the upper cover. If necessary, the tightening type gasket can be replaced.

In addition, the bearing part is completely prevented from entering foreign matter by the shaft sealing gaskets provided on both sides of the bearing part.
Furthermore, a grease injection device and a bearing member are installed on the bearing to prevent wear and tear on the bearing, so the valve stem will not become unbalanced due to wear and tear on the bearing.
Therefore, the shaft sealing gasket will not be damaged.

Further, since a stopper device is provided which limits the rotation range of the valve shaft by bringing a pin passed through the valve shaft into contact with a locking portion provided on the upper cover, the valve can be opened and closed accurately.

In addition, the valve of the present invention has many functions as described above by sequentially providing the shaft sealing packing, tightening device, and stopper device in the upper cover from the inside of the valve to the outside. We were able to create a compact structure that satisfied our needs.

Moreover, for this reason, it can be used in underground pipes or in environments where dust and raw materials are scattered and deposited outside.

(Example) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial vertical sectional view showing an embodiment of the valve of the present invention.

In the figure, 1 is the body of the ball valve, 2
3 is a ball, and 3 is a valve stem.The valve stem 3 is rotated approximately 90 degrees to open or close the ball 2 to the closed position. 4 is the shaft sealing packing, 5 is the shaft sealing packing 4
6 is a stopper device that limits the rotation range of the valve stem 3; 7 is an upper cover; 8 is an operating connection part which is attached to the valve stem 3 from the inside of the valve to the outside; That is, a shaft sealing gasket 4, a retightening device 5, and a stopper device 6 are provided in the upper cover 7 in order from the bottom to the top in the figure, and furthermore, the valve stem 3 is provided at the outer tip outside the upper cover 7. An operating connection 8 is formed.

Reference numerals 4a and 4b are self-sealing gaskets that perform a sealing action based on the pressure of the fluid inside the valve, and in the embodiment shown in FIG. 1, O-rings are used. Reference numeral 4c is a tightening type packing that performs a sealing action by tightening, and the shaft sealing packing 4 is composed of self-sealing packings 4a and 4b and a tightening packing 4c.

Reference numeral 3a denotes a bearing portion of the valve shaft 3, and a self-sealing packing 4a is provided on the inner side of the valve from the bearing portion 3a, and a tightening type packing 4c is provided on the outer side of the valve from the bearing portion 3a. The self-sealing packing 4b is attached to the bearing part 3.
As shown in the figure, it may be further provided on the outer side of a and the inner side of the tightening type gasket 4c.

Reference numeral 9 denotes a threaded portion for grease injection into which a grease injection device (not shown) is attached, and the grease injection device is screwed into the threaded portion 9 for grease injection, and grease is injected into the bearing portion as necessary.

3b is a male thread formed on the valve stem 3, 10 is a nut, 11 is a cylindrical gland, and 12 is a disc spring. It's getting old. Further, a disc spring 12 is installed between the nut 10 and the gland 11 as required.

13 is a locking device, 13a is a cut groove, 13b is a screw device, and the locking device 1
3 is a screw device 1 that connects two parts 10a and 10b of the nut 10 divided by an arcuate slit 13a provided approximately at the center in the thickness direction of the nut 10.
3b, as shown in the figure, or tightened and compressed by other types of screw devices.

14 is a pin attached to the valve shaft 3 by penetrating the valve shaft 3 at right angles to the axial direction, and 15 is a pin attached to the upper cover 7.
This is a locking portion formed inside the locking portion 15, and the valve shaft 3 is rotated approximately 90 degrees by bringing the pin 14 into contact with the locking portion 15 to open and close the valve.

The pin 14 is a cylindrical spirit pin provided with a cutting groove 14a in the axial direction.

An operating connection part 8 formed at the outer tip of the valve stem 3
As shown in the figure, is a prismatic shape with a substantially square cross section, or a cylindrical shape with two parallel planes facing each other on the outer surface.

Further, 16 is a bearing member attached to the bearing portion 3a of the valve shaft 3.

Note that FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and shows a structure in which the pin 14 is brought into contact with the locking portion 15 to rotate the valve shaft 13 approximately 90 degrees.

3a and 3b are partial vertical sectional views showing an embodiment of the locking device 13 for the nut 10, and a
In this case, a machine screw is used for the screw device 13b, and the cut groove 13a is
two parts 10 of nut 10 divided by
This is to prevent the nut 10 from loosening by pushing apart a and 10b, and b uses a head bolt in the screw device 13b to tighten the two parts 10a and 10b of the nut 10 divided by the cut groove 13a. This is to prevent the nut 10 from loosening.

In FIG. 1, 17 is an operating handle, 18 is a bolt for tightening the upper cover 7 to the body 1, 19 is a gasket installed between the upper cover 7 and the body 1, and 20 is a valve shaft 3 and a bolt. This is a thrust bearing provided between the bodies 1.

Next, the operation of the embodiment shown in FIGS. 1 to 3 will be explained.

The retightening device 5 tightens the tightening type gasket 4c to perform a sealing action, and the self-sealing gaskets 4a and 4b such as O-rings also perform a sealing effect, so that the fluid in the body 1 is 3 and body 1 is completely prevented from leaking.

Further, in the retightening device 5, the nut 10 screwed onto the male threaded portion 3b formed on the valve shaft 3 is connected to the gland 11.
The tightening type gasket 4c is tightened through the nut 10, and the nut 10 is provided with a locking device 1.
3, the nut 10 will not loosen and the fluid in the body 1 will not leak.

Furthermore, by installing a disc spring 12 between the nut 10 and the gland 11, it is possible to follow the wear and tear of the tightening type packing 4c and prevent leakage.

Further, in the valve of the present invention, even if there is pressurized fluid in the body 1, the upper cover 7 can be removed, so the tightening type packing 4c can be retightened by removing the upper cover 7. . If necessary, the tightening type gasket 4c can be replaced.

Further, the bearing part 3a is completely prevented from entering foreign matter by the shaft sealing gaskets 4 provided on both sides of the bearing part 3a, and the bearing part 3a is screwed into the grease injection thread part 9 to connect the grease injection device. Since the bearing part 3a is prevented from being worn out by providing the bearing member 16 or attaching the bearing member 16, the valve shaft 3 will not be biased due to the bearing part 3a being worn out, and therefore the shaft sealing packing 4 will not be damaged. Nor.

Furthermore, a stopper device 6 is provided that limits the rotation range of the valve shaft 3 by bringing a pin 14 that passes through the valve shaft 3 into contact with a locking portion 15 provided on the upper cover 7, so that the valve can be opened and closed accurately. can do.

The valve of the present invention also includes a shaft sealing packing 4,
By sequentially providing the retightening device 5 and the stopper device 6 in the upper cover 7 from the inside of the valve toward the outside, a compact structure that satisfies many functions as described above can be achieved. It can be used in underground pipes and in environments where dust and raw materials are scattered and deposited outside.

Although the valves in the embodiments described above are ball valves, the present invention can also be applied to other valves, such as butterfly valves and plug valves, which are opened and closed by rotating the valve shaft approximately 90 degrees. .

(Effects of the Invention) The valve of the present invention, configured as described above, can obtain the above-mentioned effects, and the following excellent effects can be obtained.

(1) There is no wear and tear on the bearing, the valve shaft is not biased, and the shaft sealing gasket is not damaged.

(2) Since it has a complete retightening device, it is possible to keep up with the wear and tear of the gasket, and even when the fluid is under pressure, the gasket can be retightened and replaced.

(3) The shaft sealing gasket has an overlapping structure, which allows for perfect shaft sealing.

(4) Can be used in underground pipes or in environments where dust and raw materials are scattered and deposited outside.

(5) Prevents fluid from entering the interior from the outside and protects internal parts from corrosion.

(6) Compact and low cost.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional view showing an embodiment of the valve of the present invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 a and b are diagrams showing a nut in the valve of the present invention. FIG. 3...Valve stem, 3a...Bearing part, 3b...Male thread part, 4...Shaft sealing packing, 4a and 4b...Self-sealing packing (O-ring), 4c...Tightening packing, 5... Retightening device, 6... stopper device,
7...Top cover, 8...Operation connection, 10a
and 10b...two parts of the nut, 11...ground, 12...disc spring, 13...loosening device, 13a...cut groove, 13b...screw device, 14...pin, 14a...cutting groove , 15...
Locking portion, 16... Bearing member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A valve that is opened and closed by rotating the valve shaft approximately 90 degrees, and the valve shaft of the valve is provided with a shaft that is sequentially opened and closed from the inside of the valve to the outside of the valve. A sealing gasket, a tightening device for the gasket, and a stopper device for limiting the rotation range of the valve shaft are provided in the upper cover, and an operating connection portion is further provided at the outer tip of the valve shaft outside the upper cover. A valve characterized by forming. (2) The shaft sealing packing consists of a self-sealing packing that performs a sealing action by the pressure of the fluid inside the valve, and a tightening packing that performs a sealing action by tightening. Valves listed. (3) Registration of a utility model in which the self-sealing type packing is provided on the inner side of the valve from the bearing part of the valve stem, and the tightening type packing is provided on the outer side of the valve from the bearing part of the valve stem. The valve according to claim 2. (4) A request for registration of a utility model in which the self-sealing packing is provided on the inner and outer sides of the valve from the bearing part of the valve stem, and the tightening packing is provided on the outer side of the valve. 2. The valve according to item 2. (5) The valve according to claims 3 and 4 of the utility model registration claim, which is provided with a grease injection device for injecting grease into the bearing portion. (6) The valve according to claims 2 to 5, wherein the self-sealing packing is an O-ring. (7) The retightening device is a utility model consisting of a nut that is screwed onto a male thread formed on the valve shaft and has a locking device, and a cylindrical gland installed between the nut and the tightening type packing. A valve according to claim 1. (8) The valve according to claim 7, wherein a disc spring is installed between the nut and the gland. (9) The locking device of the nut is provided with an arcuate groove in the approximate center of the nut, and the two parts of the nut divided by the groove are separated by a screw device. The valve according to claims 7 and 8 of the utility model registration, which is configured to be expanded or compressed. (10) The stopper device stops the valve shaft by bringing a pin, which is attached to the valve shaft by penetrating the valve shaft at right angles to the axial direction, into contact with a locking part formed inside the upper cover of the valve. The valve according to claim 1, which is a utility model and is rotated approximately 90 degrees to open and close the valve. (11) The valve according to claim 10, wherein the pin is a cylindrical split pin with a cutting groove provided in the axial direction of the pin. (12) The valve according to claim 1, wherein the operating connection portion has a prismatic shape with a substantially square cross section. (13) The valve according to claim 1, wherein the operating connection portion has a cylindrical shape with two parallel planes facing each other on the outer surface. (14) The valve according to claims 3 to 6, wherein a cylindrical bearing member is attached to the bearing portion of the valve shaft.