JP2002005325A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve that can absorb an axial dimensional error made in piping work and is easily mountable on feed piping, without a pipe joint with a loose flange. SOLUTION: A flange 1A for connection at one axial end of a cylindrical valve casing 2 is provided separately from the cylindrical valve casing 2, and is fixed to one end of a socket 9 having a slightly larger outside diameter than the cylindrical valve casing 2 and axially movably fitting about the cylindrical valve casing 2. The socket 9 is mounted for axial to-and-fro movement on the cylindrical valve casing 2 via a face-to-face dimension adjusting means 10 for adjusting a face-to-face dimension L of the cylindrical valve casing 2, and is also pressed against a seal ring 11 to prevent a water leak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve, and more particularly, to a valve such as a gate valve or a flow control valve which is frequently used for controlling a flow rate of a water supply pipe for water supply, industrial water, agricultural water, or the like.

[0002]

2. Description of the Related Art For example, an orifice valve frequently used for controlling the flow rate of water supply pipes for water supply, industrial water, agricultural water, and the like, as shown in FIG. A cylindrical valve box 2 provided with a connection portion) 1A, 1B;
A movable orifice (valve element) 3 accommodated in the tubular valve box 2 so as to be movable forward and backward, and fixed to the tubular valve box 2 by moving the movable orifice 3 forward and backward attached to the movable orifice 3. A valve stem 5 is provided for opening and closing the tubular valve box 2 by controlling the cross-sectional area of the fluid passing through the fixed orifice 4.

[0003]

However, in the conventional orifice valve V of this type, the dimension L between the surfaces of the cylindrical valve box 2 is set invariably according to the standard.
At the time of piping work of A and 6B, a dimension L2 between the pipe end flange 8A of the water supply pipe 6A and the pipe end flange 8B of the water supply pipe 6B.
Causes an error, the orifice valve V cannot be mounted. For this reason, as shown in FIG.
A pipe joint 7 having a loose flange 7A capable of moving in the axial direction is interposed between the flange 8A at the end of the pipe A and the flange 1A for connecting the orifice valve V, and the flange 8B at the pipe end of the water supply pipe 6B and the orifice After connecting the connection flange 1B of the valve V, the loose flange 7A is moved in the axial direction to absorb the dimensional error in the axial direction.
The orifice valve V is mounted by connecting the fixed flange 7B of the pipe joint 7 to the connection flange 1A. Therefore, the pipe joint 7 having the loose flange 7A is separately required, and a complicated operation for attaching the pipe joint 7 to the pipe end side of the water supply pipe 6A is required.

On the other hand, even when the orifice valve V is installed, for example, in the middle of an existing water supply pipe 6C (part P) shown in FIG. 6, this P part is cut off and removed on site as shown in FIG. The flange 8A is attached to the cut end of the water supply pipe 6C1 by welding, and the flange 8B is attached to the other cut end by welding.
Pipe joint 7 having a loose flange 7A that can move in the axial direction between a flange 1A for connection of the orifice valve V
After connecting the flange 8B at the pipe end of the water supply pipe 6C2 and the flange 1B for connecting the orifice valve V, the loose flange 7A is moved in the axial direction to absorb the axial dimensional error, Thereafter, the orifice valve V is mounted by connecting the fixed flange 7B of the pipe joint 7 to the connecting flange 1A.

That is, in the conventional orifice valve V in which the inter-plane dimension L of the cylindrical valve box 2 is set invariably according to the standard, the loose flange 7A is provided to absorb an axial dimensional error generated at the time of piping work. Since the pipe joint 7 is separately required and a complicated operation for mounting the pipe joint 7 is required, it becomes difficult to mount the orifice valve V. This applies not only to the above-mentioned orifice valve but also to other valves such as a gate valve and a ball valve.

Accordingly, an object of the present invention is to provide a valve which can be easily attached to a water supply pipe by absorbing an axial dimensional error generated at the time of piping work without relying on a pipe joint having a loose flange. And

[0007]

In order to achieve the above-mentioned object, a valve according to the present invention comprises a tubular valve box provided with piping connections at both ends in the axial direction, and a reciprocating movement of the tubular valve box. Or a valve body rotatably housed, and a valve equipped with a valve stem attached to the valve body for moving forward and backward or rotating or rotating the valve body to open and close the cylindrical valve box. The pipe connection portion at at least one end in the axial direction of the valve box is separated from the cylindrical valve box, and the pipe connection portion at at least one end is capable of adjusting the inter-plane dimension of the cylindrical valve box. It is characterized in that it is attached to the tubular valve box via the inter-plane dimension adjusting means in such a manner that it can move forward and backward in the axial direction and is airtight. In addition, the "dimension between surfaces of the cylindrical valve box" is a dimension between pipe connection portions provided at both ends in the axial direction of the cylindrical valve box, that is, an outer dimension in the axial direction of the cylindrical valve box (total length). ).

According to the present invention, the inter-plane dimension of the cylindrical valve box can be adjusted by moving the pipe connection portion at least at one end in the axial direction of the cylindrical valve box by the inter-plane dimension adjusting means. Therefore, even if an axial dimensional error occurs during the plumbing of the water supply pipe, the dimensional error can be absorbed by adjusting the inter-plane dimension of the tubular valve box. And can be easily attached to the water supply pipe.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an orifice valve according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a state where an inter-plane dimension is adjusted. The same or corresponding parts as those of the conventional example described with reference to FIGS. 4 to 7 are denoted by the same reference numerals.

In FIGS. 1 and 2, the orifice valve V
Is a connection flange (piping connection) at the other end in the axial direction.
1B, a movable orifice (valve element) 3 housed in the tubular valve box 2 so as to be able to move forward and backward, and a movable orifice 3 attached to the movable orifice 3 to form a tubular orifice. A valve that opens and closes the tubular valve box 2 by controlling the fluid passage cross-sectional area with the fixed orifice 4 fixed to the tubular valve box 2 by moving the valve box 2 forward and backward in a direction perpendicular to the axis of the valve box 2. A bar 5 is provided.

A connection flange (piping connection portion) 1A at one axial end of the cylindrical valve box 2 is provided separately from the cylindrical valve box 2. That is, it is fixed to one end of the socket 9 which is slightly larger in diameter than the outer diameter of the cylindrical valve box 2 and is fitted to the cylindrical valve box 2 so as to be axially movable. And socket 9
The cylindrical valve box 2 is attached to the cylindrical valve box 2 via an inter-plane dimension adjusting means 10 capable of adjusting the inter-plane dimension L so as to be capable of moving in the axial direction.

The inter-plane dimension adjusting means 10 includes a first inter-plane dimension adjusting flange 10A fixed to the outer peripheral surface of the cylindrical valve box 2;
The second flange 1 for adjusting the distance between the surfaces fixed to the outer periphery of the socket 9 so as to face the first flange 10A for adjusting the distance between the surfaces.
0B and a plurality of bolts 10C penetrating the first and second flanges 10A and 10B with a circumferential interval.
, And nuts 10D, 10D, and lock nuts 10E, 10E, which are screwed to the bolts 10C, 10C, respectively. In addition, socket 9
The inner surface of the other end of the cylindrical valve is formed with a tapered surface 9A whose diameter gradually increases from one end to the other end, and the tapered surface 9A is adjacent to the other side of the first flange 10A for adjusting the inter-plane dimension. Water (fluid) leaks from between the cylindrical valve box 2 and the socket 9 by pressing against the tapered surface 11A of the seal ring 11 made of an elastic material such as rubber wound around the outer surface of the box 2. Is sealed.

With such a configuration, the socket 9 and the connection flange 1A at the position shown by the solid line in FIG.
Moves to the position shown by the two-dot chain line by loosening the lock nuts 10E, 10E... And then tightening the nuts 10D, 10D. The flange 1A is a lock nut 10
After loosening E, 10E ..., nuts 10D, 10D ...
Is loosened, it moves to the position shown by the solid line. Therefore, in these positions nut 1
By tightening OD, 10D, etc., the tapered surface 9A of the socket 9 is pressed against the tapered surface 11A of the seal ring 11 to maintain a sealed state in which fluid leaks, and the connection flange 1A is positioned. be able to.

That is, the position of the socket 9 and the connecting flange 1A is positioned at an arbitrary position within the range of the stroke S in FIG. And cylindrical valve box 2
The distance between the surfaces between the connection flanges 1A and 1B is L to L1.
Can be adjusted within the range. Therefore, even if an axial dimensional error occurs during the piping work of the water supply pipes 6A and 6B shown in FIG. 1, the dimensional error is adjusted by adjusting the inter-plane dimension of the cylindrical valve box 2 within the range of L to L1. Therefore, the orifice valve V can be connected to the water supply pipes 6A and 6A without relying on the pipe joint 7 having the loose flange 7A as in the conventional example.
B can be easily attached. For this reason, the pipe joint 7 having the loose flange 7A becomes unnecessary, and the complicated work of attaching the pipe joint 7 to the pipe end side of the water supply pipe 6A can be omitted. This can be said to be the case where the orifice valve V is installed in the middle of the existing water supply pipe 6C (at the point P) as shown in FIG.

In the above embodiment, the connecting flange 1A at one axial end of the cylindrical valve box 2 is separated from the cylindrical valve box 2 and fixed to one end of the socket 9. Is attached to the cylindrical valve box 2 via the inter-plane dimension adjusting means 10 so as to be able to advance and retreat in the axial direction, but is used to connect the other end of the cylindrical valve box 2 in the axial direction. Flange 1
B, or each of the connecting flanges 1A and 1B at both ends, like the connecting flange 1A at the one end,
It may be attached to the cylindrical valve box 2 via the inter-plane dimension adjusting means 10 so as to be able to move in the axial direction.

In the above embodiment, the description has been made with the orifice valve V. However, the present invention can be applied to a gate valve V1 as shown in FIG. 3, a ball valve (not shown), and other valves. In the gate valve V1 shown in FIG. 3, the same or corresponding parts as those of the orifice valve V of FIG.

[0017]

As described above, since the split type gate valve of the present invention is constituted, the following special effects can be obtained.

That is, even if a dimensional error in the axial direction occurs at the time of piping work of the water supply pipe, the dimensional error is adjusted by the inter-plane dimension adjusting operation of the inter-plane dimension adjusting means to adjust the inter-plane dimension of the cylindrical valve box. Because it can be absorbed by
It can be easily attached to a water supply pipe without relying on a pipe fitting having a loose flange. Therefore, the pipe joint is not required, and a complicated operation of attaching the pipe joint to the pipe end of the water supply pipe can be omitted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an orifice valve according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing an inter-plane dimension adjustment state.

FIG. 3 is a longitudinal sectional view of a gate valve according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional orifice valve.

FIG. 5 is a front view showing an example of an attached state of a conventional orifice valve.

FIG. 6 is a front view showing an example of an existing pipe.

FIG. 7 is a front view showing a state where a conventional orifice valve is attached to the existing pipe of FIG. 6;

[Explanation of symbols]

 Reference Signs List 1A Connection flange (Piping connection part) 1B Connection Flange (Piping connection part) 2 Cylindrical valve box 3 Movable orifice (Valve body) 5 Valve rod 10 Face-to-face dimension adjusting means L Between face of cylindrical valve box Size

Claims (1)

[Claims] 1. A cylindrical valve box provided with a pipe connection portion at both ends in an axial direction, a valve element housed in the cylindrical valve box so as to be movable forward and backward or rotatable, and mounted on the valve element. In a valve provided with a valve stem for moving the valve body forward or backward or rotating to open or close the cylindrical valve box, the pipe connection portion at at least one end in the axial direction of the cylindrical valve box is formed in a cylindrical shape. At least one end of the pipe connection portion is separated from the valve box, and the pipe connection portion at at least one end of the cylindrical valve box is moved in and out of the axial direction through the inter-plane dimension adjusting means capable of adjusting the inter-plane dimension of the cylindrical valve box. A valve which is movable and airtightly mounted.