JP2000018402A - Valve with contactless valve seat holder ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of valve components and provide a structure that is not necessarily mounted (connected) to a valve casing on a valve element but just installed in a space between a valve seat and the valve element by using a valve seat holder ring, and to provide a valve with the contactless valve holder ring, which is capable of preventing springing out or deforming of the valve seat by just incorporating the valve seat holder ring after the valve seat and the valve casing are incorporated. SOLUTION: A valve with a contactless valve seat holder ring is comprised of annular valve seat holder ring 6 and an annular or partly annular elastic body 7. The annular valve seat holder ring 6 is made of metal or high rigid plastic. This ring 6 is brought into contact at its one surface with one or both sides of a valve seat 4 that seals a valve seat casing 5 incorporating the valve seat 4 within a valve casing 3 while it is fittedly mounted so that it may be in contact at its another surface with the valve element 2. The elastic body 7 is made of resin or rubber and attached to the other side of the ring 6 contacting with the valve element 2 by a coating, pressing-in, or bonding process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve having a non-joining type valve seat retaining ring which is not joined to a valve seat box or the like, which prevents the valve seat of a ball valve from popping out or deforming to improve the sealing performance.

[0002]

2. Description of the Related Art In a general structure of a conventional high-pressure ball valve, when a valve element is in a position other than a fully closed or fully opened position (a half open position), fluid may enter a back surface of a valve seat and the valve seat may fly out. In this case, when the valve body is further rotated, the opening of the valve body draws out the valve seat, and the valve seat may be deformed or damaged.

In order to solve these problems, a valve seat fixing device has been conventionally provided as shown in FIG. The back side of the valve seat 4 is housed in a valve seat box 5, and the valve body 2 side is prevented by a valve seat holding plate 10 from jumping out of the valve seat 4. That is, the valve seat holding plate 10 is tightened (joined) to the valve seat box 5 from the valve body 2 side by the bolt 11, and the valve seat 4 is loaded in the interior portion of the valve seat box 5, so that no fluid enters. It has become.

[0004]

However, in the above conventional example, in order to prevent the valve seat from popping out,
Since the valve seat holding plate is fastened and fixed to the valve seat box with bolts, the structure of the valve is complicated, the number of parts is large, and the mounting of the valve seat holding plate is troublesome. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to depart from the technical idea of joining a valve seat holding plate to a valve seat box using bolts or the like as in the conventional case, and to provide a valve seat holding ring. Uses a small number of parts and attaches (joins) to a valve box or valve body
It is possible to realize a structure that only requires loading between the valve seat and the valve body without having to install the valve seat and the valve seat box. It is intended to provide a valve having a non-joining type valve seat retaining ring which can prevent the occurrence of the pressure. Furthermore, it is an object of the present invention to provide a valve which can be converted to a high pressure even if the valve is initially used for a low pressure.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, one surface comes into contact with one or both of a valve seat box in which a valve seat is provided and a valve seat for sealing a valve body. ,
An annular metal or high-rigidity plastic valve seat retainer ring fitted and mounted so that the other surface is in contact with the valve body, and this valve seat retainer ring is coated, press-fitted, bonded, or the like to the other surface that contacts the valve body. A valve having a non-joint type valve seat retaining ring composed of an attached resin, rubber or other annular or partial elastic body.

In the second invention, the cross section of the valve seat holding ring is substantially a right triangle, and one surface sandwiching the right angle is in contact with one or both of the valve seat box or the valve seat in which the valve seat is provided, and the other surface is connected to the valve box. A valve having a non-joint type valve seat retaining ring in which the other surface (inclined surface) is brought into contact with the valve body via an elastic body so as to come into contact therewith. (Function) In the first invention, the valve seat holding ring has high rigidity and one surface is in contact with one or both of the valve seat and the valve seat box, and the other surface is in contact with the valve body via the elastic body. Thus, the deformation or movement of the valve seat or the valve seat box does not occur. Therefore, when the valve body is rotated to a position other than the fully closed or fully opened position, even if a force is generated such that fluid enters the back of the valve seat and the valve seat jumps out to the valve body side, the valve seat is reliably prevented from jumping out. be able to.

[0007] The valve seat retaining ring has only one surface in contact with the valve seat and the other surface in contact with the valve body via an elastic body. is there. The elastic body is made of resin, rubber, or the like, and can be easily attached to the other surface of the valve seat retaining ring by coating, press fitting, bonding, or the like.

When a valve for low pressure is manufactured initially and used for high pressure applications, it is easy to additionally incorporate a valve seat retaining ring. Can be remodeled. In the second invention, the valve seat holding ring has a substantially equilateral triangle, and one surface sandwiching the right angle is in contact with one or both of the valve seat and the valve seat box, and the other surface is designed to be in contact with the valve box. In case, there is stability when wearing,
Installation became easier.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has an annular valve seat holding ring which is in contact with one or both of a valve seat box or a valve seat in which a valve seat is provided, and which is in contact with a valve body via an elastic body. In addition, by reducing the gap between the valve seat and the valve body, deformation and breakage of the valve seat were prevented, and a valve having excellent sealing properties was provided.
The valve seat retaining ring is precisely fixed only by fitting between the valve seat and the valve seat box, and does not need to be joined.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 and 2, reference numeral 1 denotes a valve, which uses a ball valve. The invention can be applied not only to a ball valve but also to a cock. Reference numeral 2 denotes a valve body, 3 denotes a valve box, 4 denotes a valve seat, and 5 denotes a valve seat box in which the valve seat is provided. Reference numeral 6 denotes a valve seat retaining ring, which is made of an annular metal or high-rigidity plastic (for example, Duracon or engineering plastic). One surface a contacts one or both of the valve seat 4 and the valve seat box 5, and the other surface b Valve 2
It is fitted so as to come into contact with. Reference numeral 7 denotes an elastic body, which is made of resin, rubber, or the like attached to the other surface b (inclined surface) of the valve seat holding ring 6 by coating, press fitting, bonding, or the like. Can be reduced. When this elastic body 7 is provided on the entire ring,
Alternatively, it may be provided in a strip shape on the annular surface.

The valve seat 4 resiliently contacts the valve body 2 with a spring 8 to seal. Reference numeral 9 denotes an O-ring. FIG.
Then, the cross section of the valve seat holding ring 6 is a substantially right triangle, and one surface a sandwiching the right angle is in contact with one or both of the valve seat 4 or the valve seat box 5 having the valve seat therein, and the other surface c is connected to the valve box 3. The other surface b (inclined surface) comes into contact with the valve body via the elastic body 7. However, the one surface c does not necessarily need to contact the valve box 3 and may not be in contact therewith. The valve seat retaining ring 6 is fitted and inserted between the valve seat or the valve seat box and the valve body, and is not joined to the valve seat box 5 by bolting as in the conventional example.

[0012]

According to the present invention, the valve seat retaining ring is provided to reduce the gap between the valve seat and the valve body, thereby preventing deformation and breakage of the valve seat and preventing high pressure from entering the back side of the valve seat. In addition, it was possible to provide a valve having a non-joining type valve seat holding ring having excellent sealing properties. In addition, since it is a non-joined type, the valve seat holding ring only needs to be inserted between the valve seat and the valve seat box, and the manufacture and assembly of the valve with a simple structure are extremely easy.

Further, if a low-pressure ball valve is initially manufactured and the valve is used for a high-pressure application, it can be easily converted to a high-pressure ball valve at a piping work site by additionally incorporating a valve seat retaining ring. . The valve seat holding ring is a substantially equilateral triangle, and one side sandwiching the right angle is in contact with one or both of the valve seat and valve seat box, and the other side is designed to be in contact with the valve box. There is an effect that attachment becomes easier.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ball valve embodying the present invention.

FIG. 2 is a sectional view of the main part.

FIG. 3 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 valve 2 valve body 3 valve box 4 valve seat 5 valve seat box 6 valve seat holding ring 7 elastic body a one side b other side

Claims (2)

[Claims] An annular metal fitted and fitted so that one surface or the other is in contact with one or both of a valve seat box in which a valve seat is provided and a valve seat that seals a valve body in a valve box. Or high-rigidity plastic valve seat retainer ring, and this valve seat retainer ring is attached to the other surface in contact with the valve body by coating, press-fitting, bonding, or the like, and is annular or partly elastic body made of resin, rubber or the like. And a non-joined valve seat holding ring. 2. A cross section of the valve seat retaining ring is a substantially right triangle,
One surface sandwiching the right angle contacts one or both of the valve seat box or the valve seat with the valve seat inside, the other surface contacts the valve box, and the other surface (inclined surface) contacts the valve body via the elastic body. A valve having a non-joint type valve seat retaining ring according to claim 1.