JPH05618Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an anticorrosion coating for a valve in a buried pipe, and particularly to an anticorrosion coating for a valve with a two-part valve body or a flange connection type.

[Prior Art] FIG. 2 shows a conventional ball valve coated with anti-corrosion coating. The valve body 1 of this ball valve is of a two-part type and consists of a valve body 1A and a valve body 1B, which are integrally connected by a flange type bolt 2 and an internal thread formed on the valve body 1A. There is. The valve box 1 has an inlet and an inlet on both sides thereof, a housing portion for a ball 3 serving as a valve body in the center, and a through hole through which a valve rod 5 passes through the center. A ball 3 having a through hole 31 in the center is stored in the ball storage portion of the valve box 1, and an annular seat ring 4 made of an elastic material is brought into contact with the outer peripheral surface of both left and right ends of the ball 3. The ball 3 is supported by the valve body 1 via the seat ring 4.

A groove is formed on the upper outer circumferential surface of the ball 3, and a valve stem 5 extending above the ball and protruding from the through hole of the valve body 1 is fitted into this groove.

A valve box cover 6 is placed on the upper surface of the valve case 1 and fixed, but at this time the valve stem 5 also penetrates through the valve case cover 6 and protrudes.

A handle cap 7 that fits on the outer peripheral surface of the side surface of the valve box lid 6 is installed, and the handle cap 7 is attached to the valve stem 5.
Rotatably connected with the upper end of.

By rotating the handle cap 7 by 90 degrees,
Ball 3 rotates 90 degrees to open and close the ball valve.
This ball valve has flange portions at both ends of the valve box 1, and the flange portions of the valve box 1 and a flange 21 fixedly attached to a pipe 20 are connected and fixed by bolts 22 and nuts 23.
The ball valve to which this pipe 20 is attached is
When connecting a tube with an anti-corrosion coating on the end and outer surface of the pipe, the connection can be made by welding or the like, and an anti-corrosion tape or the like can be wrapped around the welded joint to easily apply the anti-corrosion coating to the joint.

Generally, a flange or internal thread is formed on the side end surface of a ball valve for connection to a pipe.
Therefore, when a general ball valve and a pipe coated with an anti-corrosion coating are connected by a flange or a screw, it is troublesome to apply the anti-corrosion coating to this joint. Therefore, a need has arisen for a ball valve with a tube in which the tube 20 is previously attached and connected to a general ball valve.

The above-described ball valve with a tube is provided with an anticorrosion coating, that is, the entire outer surface is painted.
This coating is quick-drying, quick-curing, has a large film thickness, and is a two-component hot airless spray coating using a solvent-free two-component paint based on polyurethane and tar.

[Problems to be solved by the invention] Since the above-described anti-corrosion coated ball valve is spray-painted when applying the anti-corrosion coating, it is difficult to make the thick film of the anti-corrosion coating a constant thickness. Especially the flange 21 and the valve body 1
The corner of the head of the bolt for connecting the valve body 1, the corner of the nut as well, and the corner of the head of the bolt 2 for connecting the valve body 1 as a whole because the valve body 1 is a two-part type are sharp, so the film thickness is small. It tends to become thinner, and in extreme cases, the film thickness may be zero even after anti-corrosion coating, that is, there is no anti-corrosion coating.

[Means for solving the problem] In order to solve the problem that the corner of the bolt head or the corner of the nut of the valve having the flange connection part described above is not coated with anti-corrosion coating, the present invention has been proposed. This is an anti-corrosion coated valve in which a resin cap with rounded corners is placed over the bolt head or nut and a thick spray coating is applied to the cap.

This anti-corrosion coated valve is made by covering the ball head or nut of the flange connection with a resin cap with rounded corners, so that the corners are not sharp, so even if a thick spray coating is applied. There are no areas without anti-corrosion coating. Even if there is a part of the resin cap that is not coated with anti-corrosion coating, the heads of the bolts and nuts are covered with resin and have an anti-corrosion effect equal to or better than anti-corrosion coating.

[Example] FIG. 1 shows the main parts of a ball valve coated with anti-corrosion coating, which is an example of the present invention. This anti-corrosion coating valve has the same ball valve body as the conventional ball valve body except for the anti-corrosion coating portion, and is as follows.

The valve body 1 of the ball valve is of a two-part type and consists of a valve body 1A and a valve body 1B.
They are integrally connected by an internal thread.
The integrally connected valve box 1 has an inlet and an inlet on both sides.
Between these inlets, that is, in the center thereof, is a ball storage part for storing the ball 3, which is a valve body, and above this ball storage part, in other words, above the center part, there is a through hole through which the valve rod 5 protrudes. have.

A ball 3 is stored in a ball storage part of a valve box 1 via a seat ring 4. This ball 3 has a through hole 31 opened in the horizontal direction in the center, and a groove into which the lower end of the valve stem 5 fits is formed at the upper end of the outer peripheral surface.
An annular seat ring 4 made of an elastic material is brought into contact with the outer peripheral surface of both left and right ends of the ball 3.

Here, the outer peripheral surface and side surface of each seat ring 4 are in contact with the inner surface of the ball storage part of the valve box 1, and the ball 3
is supported by the valve body 1 via the seat ring 4.

The lower end of the valve stem 5 is fitted into a groove formed on the outer peripheral surface of the upper end of the ball 3, and the valve stem 5 extends upward and projects through the through hole of the valve box 1. A valve box lid 6 is placed on the top surface of the valve box 1 and fixed. This valve box lid 6 is made up of a disk part and a cylindrical part, and has a through hole in the center through which the valve stem 5 penetrates and projects. A handle cap 7 is further placed over the valve box lid 6, and a portion of the handle cap 7 is fitted to the outer circumferential surface of the cylindrical portion of the valve box lid 6 for sealing. The lower central surface of the handle cap 7 is rotatably connected to the upper end of the valve stem 5.

Flange parts are formed at both ends of the ball valve described above, that is, at the end of the valve box 1A and the end of the valve box 1B, and on these flange parts, a pipe 20A, a flange 21A fixed thereto, and a pipe 20B are formed.
A flange 21B fixed thereto is connected and fixed by bolts 22 and nuts 23 via a gasket 24.

A ball valve to which this pipe 20 and a flange 21 fixed thereto are connected and fixed is covered with a thin cap 8 made of resin and having rounded corners on the head of the bolt 2, the head of the bolt 22, and the nut 23. This is followed by spray painting as in the prior art.

The anti-corrosion coated ball valve according to the above-described embodiments has the effect that there are no areas where the anti-corrosion coating is not applied or where the thickness of the anti-corrosion coating is extremely thin because the corners of the bolt or nut portion are not sharp.

In addition, the valve box of the ball valve in this example was a split type, but even if the valve box is not a split type and is an integrated type, the present invention can be applied as long as the ball valve has a pipe and a flange fixed to it. It has the same effect as the example.

[Effects of the Invention] As explained above, the anti-corrosion coated valve with a large thickness according to the present invention has the advantage that there are no areas where there is no anti-corrosion coating or where the thickness of the anti-corrosion coating is extremely thin.

Furthermore, since the cap is made of resin, the cap itself has an anti-corrosion effect, further increasing its anti-corrosion effect.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the main parts of a corrosion-resistant coating valve showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a conventional corrosion-resistant coating valve. 1...Valve box, 2...Bolt, 20...Pipe, 21
... flange, 3 ... ball, 4 ... seat ring, 5 ... valve stem, 6 ... main body lid, 7 ... handle cap, 8 ... cap.

Claims (1)

[Claims for Utility Model Registration] (1) A resin cap with a smooth external shape is attached to the heads of the bolts and nuts of a valve body made of ferrous metal having a bolt-nut fastening part on the outside surface, An anti-corrosion coated valve, characterized in that an anti-corrosion coating is applied to the outer surface of the valve body through the cap. (2) Utility Model Registration The anti-corrosion coating valve according to claim 1, wherein the valve body is a ball valve. (3) Utility Model Registration The anticorrosion coated valve according to claims 1 and 2, wherein the valve body has a flange with a pipe attached to an end thereof by bolts and nuts.