JPH0328209Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a device for connecting and fixing a valve body and a valve stem in a valve, particularly for fixing a valve body and a valve stem in a large-diameter valve. Regarding the fixation device that is most suitable for

(Prior Art) Conventionally, a valve, such as a butterfly valve or a globe valve, has a rotatable valve body disposed within the main body, and a valve stem that rotates the valve body extends outside the main body. In this case, from a structural and manufacturing standpoint, the valve body and valve stem are constructed separately from each other, and by connecting them, external driving force is transmitted to the valve body via the valve stem. There is.

Conventionally, the following two methods have been generally used to connect and fix the valve body and valve stem. The first means is to form a valve stem insertion hole 2 in the valve body 1 as shown in FIG.
A second method is to form a taper hole 4 integrally with the valve body 1 and insert and fix a taper bolt 5 or taper pin therein. The rod insertion hole 2 is formed as a square hole with a square cross section, and the tip of the valve rod 3 is formed as a prismatic portion 6 with a cross section corresponding to the square hole.
This is a method of inserting and connecting the valve stem 3 and the valve stem 3 in a state where they are prevented from rotating.

(Problem to be solved by the invention) In the case of the first means, since the head or nut of the taper bolt or taper pin protrudes from the surface of the valve body, it becomes a flow resistance to the fluid used and the fluid is In the case of chiller or powder, there was a risk of fluid buildup and wear of the protruding parts, leading to breakage. Furthermore, since it is necessary to insert taper bolts, taper pins, etc. after inserting the valve stem into the valve body, the surface of the valve body must be coated with corrosion-resistant coating or lining with tetrafluoroethylene resin, etc. The drawback was that it could not be applied.

According to the second method, the drawbacks seen in the first method can be overcome, but it is difficult to machine a square hole with a square cross section to be formed in the valve body, especially for large diameter valves. However, the square hole had to be machined by electrical discharge machining, slotter machining, etc., which inevitably increased the machining cost.

(Means for solving the problem) This invention was made to solve the above problem, and the sleeve 14 has a cylindrical outer circumferential surface and a rectangular hole 15 with a square cross section inside. The sleeve 14 is formed separately from the valve body 11.
Valve body 1 is inserted into the bearing part of valve body 1 with taper pin 17.
1, and engage the square column part 16 at the tip of the valve stem 12 into the square hole 15 of the sleeve 14, and then connect the valve body 11 and the valve stem 1.
2 are connected in a non-rotating state.

(Operation) A cylindrical sleeve with a square hole with a square cross section is formed separately, the sleeve is inserted into the valve body, and the valve body and the sleeve are fixed with a taper pin. A valve stem whose tip end is shaped like a prismatic column with a square cross section corresponding to the square hole of the sleeve is inserted into the sleeve, and the valve stem and the valve body are connected and fixed. Do not let both ends of the taper pin protrude from the outer surface of the valve body, but fill the holes with welding or the like so that they are flush with each other.

(Effect of the invention) According to this invention, there is no need to form a square hole with a square cross section in the valve body itself, and it is sufficient to simply machine a round hole, so even a large diameter valve body can be processed by electric discharge processing. There is no need for expensive machining such as slotting or slotter machining, making it possible to significantly reduce machining costs, and since the sleeve with a square hole can be fixed to the valve body with a taper pin in advance, the valve Unlike when the rod and the valve body are connected with a taper pin etc. after assembly, it is no longer necessary to make the head or nut of the taper pin or taper bolt protrude outside the valve body. It is possible to finish the surface without any surface. As a result, it becomes easy to coat the outer surface of the valve body with tetrafluoroethylene resin or the like in order to improve its resistance to corrosion.

(Embodiment) A preferred embodiment of this invention will be described below with reference to FIGS. 1 to 3. Although the illustrated embodiment relates to a butterfly valve, those skilled in the art will easily understand from the following description that it can be similarly applied to other valves that require connection between a valve body and a valve stem. Probably.

In the figure, 10 is a main body of a butterfly valve formed in a substantially cylindrical shape, 11 is a disc-shaped valve body rotatably supported within the main body 10, and 12 is a valve body with one end attached to the valve body 10.
1, the other end of which passes through the main body 10 and extends to the outside; 13 consists of an elastic rubber or the like, usually called a seat ring, inserted between the main body 10 and the valve body 11; It is an elastic sealant.

In this invention, a sleeve 14 having a square hole 15 with a square cross section and a cylindrical exterior is inserted into the bearing part of the valve body 11 and fixed with a taper pin 17, and a valve stem 12 is inserted into the square hole 15 of the sleeve 14. Square column part 1 with a square cross section
By inserting the valve body 11 and the valve stem 12
and are integrated in the direction of rotation.

The sleeve 14 has a cylindrical outer circumferential surface and has a hole 18 opening toward one end inside.
A rectangular hole 15 having a rectangular cross section, and a square in the illustrated embodiment, is formed at the innermost part of the hole. This sleeve 14 is inserted into a round hole 19 formed in the bearing portion of the valve body 11. The round hole 19 has approximately the same axial length as the sleeve 14, and the inserted sleeve 14 fits within the round hole 19 and does not protrude outward. After inserting the sleeve 14, the tapered hole 20 is integrally formed in the valve body 11 and the sleeve 14.
and insert a taper pin 17 into the taper hole 20.
to secure the sleeve 14 to the valve body 11.

The taper pin 17 is formed to be slightly shorter than the taper hole 20, and the driven taper pin 17 ends slightly inward from the outer surface of the valve body 11. The resulting recesses at both ends of the tapered hole 20 are filled by welding or the like to make them flush with the outer surface of the valve body 11. Thereafter, the outer surface of the valve body 11 is coated or lined with tetrafluoroethylene resin or the like, if necessary.

After fixing the sleeve 14 and applying corrosion-resistant coding etc. as necessary, the valve body 11 is attached to the main body 10.
By inserting the valve stem 12 from outside the main body 10 and connecting the square hole 15 and the square column part 16, the valve body 1
1 and a valve stem 12 are connected and fixed in a state where they are prevented from rotating.

In this way, it is sufficient to form only the round hole 19 in the bearing portion of the valve body 11, so that electric discharge machining and slotter machining, which require a large processing cost as in the case of forming a square hole, are not required. Also, the taper pin is
Since it is driven in before the valve body and valve stem are connected, there is no risk of any damage to the corrosion-resistant coding or lining on the outer surface of the valve body.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a part of a butterfly valve to which this invention is applied, Fig. 2 is a perspective view of the sleeve and taper pin, Fig. 3 is a perspective view of the center longitudinal section of the sleeve,
4 and 5 are partial sectional views showing conventional fixing means. 10...Main body, 11...Valve body, 12...Valve stem,
13...Elastic sealing material, 14...Sleeve, 15...
...square hole, 16 ... square column, 17 ... taper pin, 18 ... hole, 19 ... round hole, 20 ... taper hole.

Claims (1)

[Scope of utility model registration request] The outer circumferential surface is cylindrical and the inside has a square hole 15 with a square cross section.
A sleeve 14 is formed separately from the valve body 11, and the sleeve 14 is inserted into the bearing part of the valve body 11 and fixed to the valve body 11 with a taper pin 17. 16 into the square hole 15 of the sleeve 14
A fixing device for a valve body and a valve stem in a valve, characterized in that the valve body 11 and the valve stem 12 are connected to each other in a state where they are prevented from rotating.