JPH0338535Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a ball valve with a pipe-shaped valve box used in the chemical industry and general industrial machinery using corrosion-resistant fluids. This relates to the weak gland structure of a ball valve.

PRIOR TECHNOLOGY A pipe ball valve that uses a pipe cut to an appropriate length as a valve box is connected to the valve box by fitting a cylindrical gland part to one side of the valve box and welding the outer periphery of the fitting part. The ground part was connected and fixed.

Problems to be solved by the invention The connection between the valve body and the gland needs to have the strength to support the pressure of the fluid flowing inside the valve and the weight of the connected equipment. However, in the case of conventional ball valves that use cut pipes for the valve body, the desired strength can be obtained when using materials with high welding efficiency such as steel plates, but when using materials with poor welding efficiency, For example, if Monel material, titanium material, brass material, etc. are used, fluid leakage will occur due to the lack of strength. Also, in order to obtain the strength of the welded part, a large amount of welding is performed, which may be caused by the heat effect of welding. The cylindrical valve box had an elliptical shape, making it impossible to obtain the desired accuracy. As described above, the present invention provides a structure in which desired strength can be obtained even when using materials that are not suitable for welded structures.

Means for Solving the Problems The structure of the gland part of the ball valve according to the present invention is made by fitting and welding a pipe-shaped valve box and the gland part, and has a groove on the outer periphery of the gland part of the fitting part. A groove is provided on the inner wall of the fitting hole of the pipe-shaped valve box opposite to the groove, and the inner peripheral wall of the groove-formed part of the pipe-shaped valve box is circumscribed by the circumferential wall of the groove forming part of the gland part and in the ring-shaped grooves facing each other. A polygonal elastic ring that is approximately inscribed in the ring is fitted into the ring.

Function In this invention, the central part of each side of the polygonal elastic ring contacts the groove circumferential wall of the gland part, and each corner and the vicinity of the corner engages with the groove on the valve box side to prevent it from coming off. The strength of the connection between the welded portion and the welded portion can be increased, and the welding is sufficient to prevent fluid from flowing out, and it is no longer necessary to maintain the strength of the connection using the welded portion.

Embodiment 1 is a pipe-shaped valve box, 2 is a cylindrical gland part fitted to one side of the pipe-shaped valve box 1, 3 is a groove provided on the outer periphery of the fitting part of the gland part 2 with the valve box 1, 4 groove 3
a groove provided on the inner wall of the fitting portion of the valve box 1 facing the valve body 1;
are rectangular elastic rings, facing each other.
The grooves 3 and 4 are fitted into grooves 3 and 4 in which ring-shaped grooves are formed. The inner circumference of the elastic ring 5 is formed to circumscribe the circumferential wall of the groove forming part of the gland part 2, and the outer circumference of the elastic ring 5 is formed so as to substantially inscribe the inner circumferential wall of the groove forming part of the valve body 1. When attaching the elastic ring 5 to the gland part 2 and fitting the gland part 2 into the fitting hole 6 of the valve body 1, the vicinity of the corner of the elastic ring 5 protrudes from the groove 3, so move the corner A into the groove 3. When pushed in, the center part B of the elastic ring 5 is pushed outward, deforming as shown in Fig. 4, and being pushed into the groove 3, and the gland part 2 is inserted, so that the grooves 3 and 4 correspond to each other. When the position shown in FIG. 3 is reached, each corner part A is inserted and fitted into the groove 4 at a predetermined position shown in FIG. 3 due to elasticity. Reference numeral 7 denotes a chamfered portion provided at the periphery of the entrance portion of the fitting hole 6, which is formed to facilitate insertion of the gland portion. Reference numeral 8 denotes a welding portion connecting the ground portion 2 fitted into the fitting hole 6 and the chamfered portion 7 of the valve body 1.

The elastic ring 5 is deformed and pushed into the groove 3 of the gland part 2, the gland part 2 is fitted into the fitting hole 6 of the valve body 1, and the elastic ring 5 is inserted into the groove 4 facing the groove 3.
When each corner of the fitting hole is inserted elastically, it has a retaining action and the connection strength of the gland part can be maintained, and the welding between the fitting hole periphery and the gland part only needs to prevent outflow of fluid.

In the above embodiment, a rectangular elastic ring is used, but other polygonal shapes may be used. Further, as shown in FIG. 6, an O-ring for fluid closure may be provided on the outer periphery of the gland portion.

Effects of the invention Since the present invention has the above-described structure and function, it is possible to connect the gland part and the valve body using an elastic ring with sufficient strength to support fluid pressure and the weight of operating equipment, and welding is possible. The cylindrical valve body will not be deformed by welding heat, and even if materials with poor welding efficiency are used, it can be welded so that there is no fluid leakage. You can get a safe ball valve.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of the gland structure of the ball valve according to the present invention, Figure 3 is a cross-sectional view taken along line A-A in Figure 2, and Figures 4 and 5 are main parts of the gland when inserted. Cross-sectional view, FIG. 6 is a cross-sectional view of main parts showing another embodiment. 1...Valve box, 2...Gland part, 3...Groove, 4
... Groove, 5 ... Elastic ring, 6 ... Fitting hole, 8 ...
…welded part.

Claims (1)

[Claims for Utility Model Registration] (1) A pipe-shaped valve body and a gland part are fitted and welded, and the fitting part has a groove on the outer periphery of the gland part, and a pipe-shaped valve body is provided opposite to the groove. The valve box has a groove on the inner wall of the fitting hole, and the ring-shaped grooves facing each other have a polygonal elastic member circumscribing the circumferential wall of the groove forming part of the gland part and substantially inscribed in the inner circumferential wall of the groove forming part of the pipe-shaped valve box. A ball valve gland structure characterized by a fitted ring. (2) The gland part structure of a ball valve according to claim 1 of the utility model registration, in which an O-ring is provided on the outer periphery of the fitting part of the gland part provided with a groove.