JP2532216Y2 - Gate valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve used for water control, oil control and gas control.

[0002]

2. Description of the Related Art Conventionally, when water flowing in a conduit is temporarily or for a long time stopped, a ductile gate valve is installed in the middle of the conduit, and the valve body of the gate valve is lowered to stop water. I was

[0003]

However, in the above prior art, since the gate valve is a ductile, the gate valve is very heavy, and the complexity in transportation and installation thereof cannot be ignored. . Furthermore, due to the weight of the gate valve, a support base for supporting the weight of the gate valve is often required below the installation position of the gate valve. The present invention has been made in view of the above-mentioned problems, and by manufacturing a gate valve using a lightweight material having substantially the same thickness as a conduit, a gate valve that is easy to transport and install is provided. The purpose is to provide.

[0004]

The gate valve of the present invention forms an annular upright portion having an opening above the conduit, and the annular upright portion is substantially the same as the conduit so as to surround a part of the outer periphery thereof. A thick operating cylinder is fitted therein, and the upper end of the annular upright portion is used as a valve seat portion. Inside the operating cylinder, a gate portion capable of contacting the inner periphery of the conduit excluding an opening portion, and the valve seat portion A valve body comprising a disc part which can be brought into contact with the inner part is vertically movable, and at least one inner bar for guiding the movement of the gate part is welded in the conduit. I have.

[0005]

Since the valve casing of the gate valve is formed of the conduit itself and the operating cylinder having substantially the same thickness as the conduit, the gate valve becomes extremely lightweight and the fitting portion between the conduit and the operating cylinder is provided. The upper end of the annular upright portion can be used also as a valve seat. Further, since the inner bar for guiding the movement of the gate portion of the valve element is welded and installed in the conduit, the strength of the conduit, which is inferior in strength to that of ductile, can be compensated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an operation sectional view of the gate valve of the present invention. The right half of the gate valve shows an open state, and the left half shows a closed state. FIG. 2 is a partially cutaway perspective view of the gate valve.

The conduit (1) is a steel plate or a stainless steel pipe having substantially the same thickness as the pipe (2) connected by welding, flange connection, or the like, and has an annular upright having an opening (3) in the upper part. (4) is formed. As a means for forming the opening (3) and the annular upright (4), for example, a bulge-type working method is used to apply water pressure or the like from the inside of the pipe and inflate a part of the pipe upward as shown in FIG. The opening (3) and the annular upright portion (4) are formed by cutting a part of the bulging portion.

In this bulge-type machining, the conduit (1) is previously molded before applying water pressure, and the conduit (1) is appropriately changed into an optimal shape. Since the portion (4) is formed, the diameter R of the circular opening (3) and the diameter R of the conduit (1) are formed to be substantially the same.

An operation tube (5) such as a steel plate or a stainless steel tube having substantially the same thickness as the conduit (1) is fitted into the annular upright portion (4) so as to surround a part of the outer periphery thereof. Standing part
The upper end of (4) and the inner periphery of the operation cylinder (5) are welded to join them together. Solvents used for this welding include
Stainless steel solvent is preferred.
By gradually reducing the thickness from the upper end of (4) to the upper part of the operation cylinder (5), a gently tapered valve seat (6)
Is formed.

[0010] A conduit (1) is provided with an annular upright portion (4).
The inner bar (7) penetrates perpendicularly to the axis of (1), and the conduit
It is connected by welding (8) at the penetration part of (1).

A flange (9) is fixed to the upper end of the operating cylinder (5) by welding, and a lid (10) for sealing the operating cylinder (5) is fixed to the upper part of the flange (9) by bolts (11). ing. Further, at the center of the lid (10), the stem operating section (12) and the large diameter section (1
3) and an operating stem (1) consisting of a screw rod (14)
5) is penetrated, and the operation stem (15) is pivotally connected to the lid (10) at the large diameter portion (13). The large-diameter portion (13) is pressed up and down via a bearing plate (16), and is pressed from above by a pressing plate (18) fixed with bolts (17).

A valve element (19) is provided inside the operation cylinder (5) so as to be movable up and down. As shown in FIG. 2, a tongue-shaped gate (20) and a disk-shaped disk are particularly provided. Department (21). A vertical hole (22) is formed in the center of the valve element (19), and a key groove (23) is formed at an appropriate position in the vertical hole (22).

The keyway (23) of the vertical hole has an internal thread (2
4), a driven cylinder (26) having a key (25) on the outer periphery is fitted, fixed so that it cannot rotate with respect to the valve body (19), and fixed with a screw (27) from above. It is held by the holding plate (28).

A U-shaped groove (29) is formed in the gate portion (20) of the valve element (19) so as to surround the shape, and an annular groove (30) is formed in the disk portion (21) around the U-shaped groove (29). And in those grooves
The U-shaped seal (31) and the annular seal (32) are integrally embedded in (29) and (30).

Screw rod (14) of operating stem (15)
Is screwed into the driven cylinder (26) of the valve element (19), and the valve element (19)
And the operating stem (15). Follower cylinder (2
6) is keyed, and the inner bar (7) is used for the valve body (19).
Because the rotation of the stem is restricted, the stem operation part (12)
When the valve is rotated, the valve element (19) moves in the operation cylinder (5) and the conduit (1).
Will move up and down.

In the open state, as shown in the right half of FIG. 1, the valve element (19) is housed in the operation cylinder (5). In the valve closed state, as shown in the left half of FIG. 1, the U-shaped seal (31) of the gate (20) comes into contact with the inner surface of the conduit (1) having a U-shaped cross section, and at the same time, the disk (21) is closed. The annular seal (32) abuts against the valve seat (6) and complete water shutoff is achieved.

As described above, since the valve casing of the gate valve is formed by the conduit (1) itself and the operating cylinder (5) having substantially the same thickness as the conduit (1), the gate valve is extremely lightweight. Become a conduit
Since the upper end of the annular upright portion (4), which is the fitting portion between the (1) and the operation cylinder (5), is used as the valve seat (6), the manufacture of the valve housing is extremely simplified.

If the valve element (19) and the holding plate (28) are made of synthetic resin or the like, the gate valve can be further reduced in weight.

Further, since the inner bar (7) for guiding the movement of the gate portion (20) of the valve element (19) is welded in the conduit (1), the strength of the conduit is inferior to that of ductile. Can be supplemented. In this embodiment, two inner bars (7) are provided. However, even if one inner bar (7) is provided, the number thereof may be further increased in order to further increase the strength.

[0020]

[Effects of the Invention] As described above, the present invention has the following effects. (a) Since the valve casing of the gate valve is formed by the conduit itself and the operating cylinder having substantially the same thickness as the conduit, the gate valve becomes extremely lightweight. (b) Since the upper end of the annular upright portion, which is the fitting portion between the conduit and the operation cylinder, is used as a valve seat, the manufacture of the valve housing is greatly simplified. (c) Since the inner bar for guiding the movement of the gate portion of the valve body is welded in the conduit, the strength of the conduit, which is inferior to ductile in strength, can be compensated.

[Brief description of the drawings]

FIG. 1 is an operation sectional view of a gate valve according to an embodiment.

FIG. 2 is a partially broken perspective view of the same.

FIG. 3 is a central cross-sectional view of only the conduit part according to the first embodiment.

[Explanation of symbols]

(1) Conduit (2) Piping (3) Opening (4) Annular upright (5) Operating cylinder (6) Valve seat (7) Inner bar (8) Welding (9) Flange (10) Lid (11) Bolt (12) Stem operating part (13) Large diameter part (14) Screw rod (15) Operating stem (16) Bearing plate (17) Bolt (18) Holding plate (19) Valve (20) Gate (21) Disk (22) Vertical hole (23) Keyway (24) Female thread (25) Key (26) Follower cylinder (27) Screw (28) Holding plate (29) U-shaped groove (30) Annular groove (31) U-shaped Seal (32) Annular seal

Claims (3)

(57) [Scope of request for utility model registration] 1. An annular upright portion having an opening above a conduit is formed, and an operating cylinder having substantially the same thickness as the conduit is fitted to the annular upright portion so as to surround a part of the outer periphery thereof. The upper end of the upright portion is used as a valve seat portion, and the operation tube includes a gate portion that can contact the inner periphery of the conduit excluding the opening portion, and a disk portion that can contact the valve seat portion. A gate valve in which a valve body is vertically movably mounted, and at least one inner bar for guiding movement of a gate portion is welded in the conduit. 2. The gate valve according to claim 1, wherein the connection between the annular upright portion of the conduit and the operating cylinder is welding, and the solvent portion is used as a valve seat. 3. The gate valve of the gate valve is provided with a U-shaped seal at an edge portion thereof, and an annular seal is provided at a peripheral edge portion of the disk portion, and both seals are integrated at intersections. The gate valve according to claim 1, wherein