JPS6144058Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stopper device for opening and closing positioning of ball valves, butterfly valves, etc. used to open and close the flow of fluids such as water and oil.

[Conventional technology]

In general, the opening/closing positioning of ball valves, etc., whose stems are rotated approximately 90 degrees using an operating device such as a lever handle, is done because the stopper device is made up of a combination of several parts. As a result, the positional accuracy becomes uncertain, and with the addition of abrasion of the abutting portion, it tends to become unstable, which often causes problems and causes various problems as described below.

As shown in FIGS. 1 and 2, the structure of a conventional stopper part is such that a hexagon socket head bolt 1 is inserted through a gland flange 2 and screwed into a body 3, and a stopper 4 is attached to the outer periphery of the head of the bolt 1. A protrusion 7 is formed on the gland flange 6 into which the gland packing 5 is pushed, as shown in FIGS. 3 and 4.
A stopper 8 is brought into contact with the protrusion 7 for positioning.

However, in the former case, the bolt 1 is only screwed into the body 3, and the body 3 and the bolt 1 are not fixed. Therefore, due to vibrations such as opening/closing operations of the handle, the bolt 1 may be damaged as shown in Fig. 5 (a). In a state of
As shown in FIG.
From the normal state shown in Figure A, the contact surface of the stopper 4 wears out as shown in Figure 6B, leading to excessive opening as described above, which eventually leads to fluid leakage. Was.

On the other hand, the latter has the same drawbacks as the former, in that the bolt 10 is tilted by the gap between the fitting screw of the bolt 10 and the body 11, and the opening degree fluctuates. As shown in FIG. 2, since there is a gap 12 between the bolt 10 and the gland flange 6, the gland flange 6 is displaced, and the position of the stopper 8 is accordingly changed. Since there are variations in accuracy at the contact points of the stopper in No. 7, this gap and variation accumulates, making the stopper positioning uncertain.
It also had drawbacks such as being in an extremely unstable state.

In order to eliminate these drawbacks, it is necessary to fix the bolt or pin with which the stopper comes into contact with the body, and to bring the stopper and the bolt or pin into contact over as wide a surface as possible to reduce wear. The ball valve stopper device shown in Japanese Patent Publication No. 38-2183 satisfies this condition. That is, the limit stop pins 82, 8
4 is fixed to the body (housing) 12, and the locking curved surface of the stopper (throwing plate) 80 that comes into contact with the limit stop pins 82, 84 is fixed to the limit stop pins 82, 84.
It is shaped so that it makes surface contact with 84.

Therefore, the opening/closing positioning of the valve is reliable and stable even during long-term use.

However, the structure illustrated in Japanese Patent Publication No. 38-2183 has an internal packing 94 and an external packing 98.
Because of the structure in which the bolts are tightened simultaneously by a single nut 90, there is
Since there are no obstructions such as glands or bolts around the limit stop pins 82 and 84 are fixed to the body (housing), and the stopper (throwing plate) 80 is fixed to the body (housing).
It is possible to bring them into contact.

However, in the structure shown in FIGS. 1 and 3, in which the gland packing 5 is tightened by the gland flange 2 or 6 via the gland, the gland flange 2 or 6 and the bolt 1 or 10 get in the way, and the pin It is difficult to provide the stopper 4, and the stopper 4 must be in contact with the separately provided pin.
Or, it is not possible to provide 8. For this purpose, as mentioned above, conventionally the stopper 4 or 8 is attached to the bolt 1.
Alternatively, the structure is such that it is brought into contact with the protrusion 7 of the ground flange 6.

[Problem that the invention attempts to solve]

The present invention differs from the structure shown in Japanese Patent Publication No. 38-2183, in that it is an opening/closing positioning stopper device in which a stopper is attached to a valve whose shaft is sealed by tightening the seal with a gland, and the positioning of the stopper is uncertain. This is an extremely simple structure that attempts to solve the problem of unstable conditions due to wear, etc., by screwing a special nut onto the stud bolt to provide a stopper function for opening/closing positioning and a ground. It is designed to effectively perform the tightening function of the packing.

[Means for solving problems]

The present invention was developed to achieve the above-mentioned purpose, and specifically, a gland packing is installed coaxially with the stem rotatably inserted into the valve body, and the gland is tightened with the gland. In a stopper device for a valve in which the shaft is sealed and a stopper having a locking curved surface is fixed to the stem, a stud bolt is inserted into an insertion hole drilled in the flange of the gland, and the lower end of the stud bolt is screwed into the body. At the same time, a nut consisting of a prismatic part for tightening the packing and a cylindrical part integrally provided at the lower part of the prismatic part is screwed from the upper end of the stud bolt, and the above-mentioned stopper is attached to the outer peripheral surface of the cylindrical part. A structure is adopted in which the locking curved surface is allowed to freely come into contact with each other in a state of surface contact, and the lower surface of the cylindrical portion is brought into contact with the upper surface of the flange of the gland.

[Effect]

The present invention consists of a stud bolt inserted through the flange of the gland as described above, screwed into the body and fixed, and a cylindrical part integrally provided at the lower part of the square column part for tightening the packing from the upper end of the bolt. The nut is screwed together, the outer peripheral surface of the cylindrical portion is brought into contact with the locking curved surface formed on the stopper, and the lower surface of the cylindrical portion is brought into contact with the upper surface of the flange of the gland. There is no need to specifically provide a limit stop pin for the cylindrical member.If the stopper fixed to the stem is brought into contact with the outer circumferential surface of the cylindrical part of the nut screwed into the stud bolt inserted through the flange of the gland, the valve can be opened and closed. Can be positioned. The stud bolt is firmly fixed to the body, and there is no risk of the stud bolt tilting even if an opening/closing operation force is applied. Moreover, since the flange of the gland is not directly related to the stopper mechanism, the accuracy of the gland is not affected. Furthermore, since the outer peripheral surface of the cylindrical part of the nut is in surface contact with the locking curved surface of the stopper, there is extremely little wear on both, and when opening and closing the valve, the positioning of the valve body such as the ball is more reliable and stable. , which is significantly improved compared to the conventional method. Furthermore, when retightening using the prismatic part of the nut, the bottom surface of the cylindrical part of the nut presses against the top surface of the gland flange.
It is possible to perform retightening work easily, and its practical value as a multi-functional valve stopper device is extremely great.

〔Example〕

8 to 10 show an example of the present invention, and 20 is a ball valve body, and a stem 22 is provided on this body 20 via a thrust washer 21 so as to be able to slide and rotate. There is. Furthermore, a ball (valve body) 23 is provided at the lower end of the stem 22, and a gland packing 2 is provided coaxially with this stem 22.
4 is inserted, a gland 25 is inserted from the upper part of this packing 24, and the gland packing 24 is tightened through this gland 25 to form a shaft sealing portion.

26 is a stud bolt, and this stud bolt 26 is inserted into the insertion hole 28 of the gland flange 27.
It is inserted into the body 20 and fixed by screwing into the body 20.

Reference numeral 29 denotes a nut screwed into the upper end of the stud bolt 26 described above, and this nut 29 is integrally formed with a prismatic portion 30 at the upper part and a cylindrical portion 31 at the lower part. It serves the function of tightening the gland packing 24 and tightens the cylindrical part 3.
Reference numeral 1 has an engaging portion for positioning a stopper 32, which will be described later, and a function of pressing the upper surface of the gland flange 27 to tighten it further.

The stopper 32 is fixedly fitted onto the prism portion of the stem 22 so as to be positioned above the gland 25, and a retaining ring 33 fixed to the stem 22 is provided on the upper part of the stopper 32. The handle 34 is connected to the ball 23 to open and close the ball 23.

The stopper 32 also has locking curved surfaces 32a and 32b, locking curved surfaces 32a and 32c, or locking curved surfaces 32a and 32c, or as shown in FIG. Curved locking surfaces 32a, 32b, 32c, and 32d are formed on the nut 29, and any one of the curved locking surfaces 32a to 32d is provided so as to abut and lock the outer peripheral surface of the cylindrical portion 31 of the nut 29 in a state of surface contact. It is being

Next, the operation of the above embodiment will be explained.

In FIGS. 8 and 9, the ball 23 is in an open state, and the locking curved surface 32a and the locking curved surface 32d of the stopper 32 are in surface contact with both cylindrical portions 31, respectively. There is.

Next, when closing the flow path of the ball 23, when the handle 34 is rotated 90 degrees clockwise in FIG. Stopping surface 32
The stopper 3 is securely closed at the position where the locking curved surface 32c and the locking curved surface 32c are in surface contact with the outer peripheral surfaces of both cylindrical portions 31.
2 stops the rotation of the stem 22.

Furthermore, when retightening the gland packing 24, tighten the prismatic portion 30 of the nut 29 with a tool such as a spanner or monkey key, and the lower surface of the cylindrical portion 31 of the nut 29 presses the gland 25 through the gland flange 27. The packing 24 can be further tightened.

In this way, the stud bolt 26 is attached to the body 20.
It is screwed into and fixed to ensure that it is integrated.
The outer peripheral surface of the cylindrical portion 31 of the nut 29 is
2, and the packing 24 can be retightened at the lower surfaces of the prismatic portion 30 and the cylindrical portion 31 of the nut 29.

In addition, FIG. 11 shows another implementation state,
This bolt 36 is a headed bolt with a prismatic portion 37 formed on the outer periphery of the head, and a cylindrical portion 38 is formed in a step shape at the bottom of the prismatic portion 37.
4, the cylindrical portion 38 is tightened to the stopper 32.
The locking curved surfaces 32a to 32d are provided so as to be in surface contact with the locking curved surfaces 32a to 32d.

35 is a lock nut provided at the mounting position of the bolt 36 and the body 20;
5 prevents the bolt 36 from tilting and maintains the bolt 36 securely fixed to the body 20.

Furthermore, although the present invention can be effectively applied to the stopper of a ball valve as described above, the present invention can also be appropriately applied to a stopper mechanism such as a butterfly valve.

[Effect of idea]

The effects of the present invention are as follows.

(1) Even if a dedicated limit stop pin is not provided, the opening/closing positioning method satisfies the following (2) to (6) by screwing a nut consisting of a square column part and a cylindrical part to a stud bolt. A stopper device is obtained.

(2) It is possible to provide a stopper device that organically combines the stopper function for opening/closing positioning and the tightening function.

(3) Valve opening/closing positioning is accurate.

(4) Stable opening/closing positioning even after long-term use.

(5) No functionality is lost by implementing the invention.

(6) The cost required to implement the present invention is extremely low, making it extremely economical.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway vertical sectional view showing a conventional example, Fig. 2 is a plan view of the same as above, Fig. 3 is a partially cutaway longitudinal sectional view showing another conventional example, and Fig. 4 is a partially cutaway longitudinal sectional view showing a conventional example. 5A and 5B are cross-sectional views showing the state in which the bolt is inclined; FIGS. 6A and 6B are plan views showing the state in which the stopper is worn; and FIG. ，
B is an explanatory plan view showing a state in which the ground flange rotates, and FIGS. 8 to 10 show embodiments of the present invention, and FIG. 8 shows a stopper device in the present invention. Partially cutaway vertical sectional view, No. 9
The figure is a partially cutaway plan view of Fig. 8, and Fig. 10 is a partially cutaway plan view of Fig. 8.
Half-cut sectional view showing the nut in FIG. 8, No. 11
The figure is a sectional view showing another example. 20...Body, 22...Stem, 23...Valve body, 24...Gland packing, 25...Gland, 26...Stud bolt, 27...Gland flange, 28...Insertion hole, 29...Nut, 3
0...Prismatic portion, 31... Cylindrical portion, 32... Stopper, 32a to 32d... Locking curved surface.

Claims (1)

[Scope of utility model registration request] In a stopper device for a valve, a gland packing is installed coaxially with a stem rotatably inserted into a valve body, the gland is tightened to seal the shaft, and a stopper having a locking curved surface is fixed to the stem. A stud bolt is inserted into the insertion hole drilled in the flange of the stud bolt, and the lower end of the stud bolt is screwed into the body to fix it, and a prismatic part for tightening the packing and a cylindrical cylinder integrally provided at the bottom of the prismatic part. A nut consisting of a part is screwed from the upper end of the stud bolt so that the locking curved surface of the stopper described above can freely come into contact with the outer circumferential surface of the cylindrical part, and the lower surface of the cylindrical part is connected to the ground of the aforementioned gland. A stopper device for positioning the opening and closing of a valve, characterized in that it is brought into contact with the upper surface of the flange.