JPS606717Y2 - Valve structure for pipe installation - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a gate valve provided to open and close a midway portion of a conduit, and more specifically, the present invention relates to the structure of a gate valve provided to open and close a midway portion of a conduit. related to valve structure.

This type of valve structure for pipe installation includes, for example,
-20474 publication and the magazine WATERWORKS ENGINEERING (WATERWORKS ENGINEERING)
G) The one shown in VOL115 No. 9 is conventionally known.

In this conventionally known structure, an inner valve box is provided within an outer valve box that surrounds a cut part of a pipe, a gate valve body is held in the inner valve box so as to be openable and closable, and this inner valve box is fitted into the cut part of a pipe. The goal was to maintain the same position.

In other words, the gate valve body forms a pair with the inner valve body, and this pair of valve body and valve body is held between opposite ends of the pipe created by cutting. This was no different from the conventional valve structure (for example, Japanese Utility Model Publication No. 38-28767).

In such a conventional structure, the conduit is completely separated at the place where the inner valve box is inserted, and therefore, in order to integrate the two conduit parts created by this separation, it is necessary to use a separate outer valve box. For this purpose, the outer valve body and the conduit must be joined with a strong force that can withstand the relative eccentric movement of both conduits and the mutual separation force in the direction of the pipe center line due to the pipe internal pressure. In addition, there was a drawback that it required time and effort to join the outer valve box and the conduit.

Furthermore, the outer valve box must have durability equal to or greater than that of the conduit, and in this respect also has the disadvantage of poor productivity.

The present invention aims to eliminate such drawbacks.

In order to achieve this object, the pipe-mounted valve structure of the present invention has a circular hole having approximately the same diameter as the inner diameter of the circular pipe, with the hole center line perpendicular to the pipe center line of the circular pipe. A valve box bored in one side of the pipe and surrounding the circular hole is fixed to the outer periphery of the circular pipe, and a gate valve body is attached to the valve box concentrically with the circular hole and movable in the direction of its center line. The outer periphery of the gate valve body is formed of an elastic seal that comes into elastic contact with the inner wall surface of the pipe, and the body of the gate valve body is approximately cylindrical, and the distal end surface is approximately spherical. It is something.

As is clear from the above structure, the present invention differs from the conventionally known technology in which the gate valve body and the valve box holding the valve body are combined into one set, and this set is attached to the pipe. This device breaks away from common technical knowledge and is characterized by the fact that the circular tube itself can be used as a conventional inner valve box, and in particular, the following effects can be obtained.

■ By forming the body of the valve body into a nearly cylindrical shape and the tip end into a nearly spherical shape, a three-dimensional valve structure that enhances the reinforcement structure can be produced easily and lightweight, reducing manufacturing costs. .

@ When the valve body formed on the spherical tip comes into pressure contact with the inner surface of the cylinder, there is a line contact along the direction perpendicular to the tube axis, so the pressing force tends to concentrate on the contact line, and the contact surface is less However, it is easy to increase the surface pressure and the valve body has excellent pressure contact with the pipe.

0 The elastic seal formed on the outer circumference of the valve body is caused by the seal itself along the spherical surface when the valve body presses against the circular pipe and deforms elastically along the spherical surface of the tip of the valve body around the contact area. The tensioning effect from the dimensional direction works evenly, and escape due to deformation of the elastic body in the direction of the tube axis is suppressed, effectively maintaining good sealing performance due to strong surface pressure■
Even if fluid pressure in the direction of the tube axis acts on the valve body when the valve is closed, and a twisting effect acts on the tip of the valve body in the direction of the tube axis,
Since the distal end surface of the valve body is formed into a substantially spherical surface, simply moving the contact portion along the spherical surface causes no problem in press contact with the inner surface of the pipe, and a good sealing effect can be maintained.

Next, an embodiment of the present invention will be described along with a procedure for attaching it to an existing fluid transport pipe 1 such as a water pipe.

FIG. 1 shows the state before forming the circular hole 7', in which the main body 2 of a T-tubular outer valve box is externally fitted and fixed in a watertight and airtight manner, and the upper end of the valve chamber 8 of this main body 2 is shown. A lower surface of a valve box 4' of a slide type water control valve 4 is removably fixed to the outer surface of the flange 3.

FIG. 2 shows the state in which the circular hole 7' is being drilled, and the main shaft of the rotation of the drilling device 5, whose lower end is removably fixed to the upper surface of the valve box 4' of the water control valve, is shown in FIG. 6 protrudes downward, and a drilling cutting edge 7 of the circular hole 7' is fixed to the lower end of the main shaft 6.

Then, the main shaft 6 moves in its axial direction under the action of the drilling device 5, thereby causing the cutting blade 7 to pass through the water control valve 4 in the open position and reach the upper surface of the pipe 1. ,
A circular hole 7' is bored in the upper surface of the tube 1, as shown in FIGS. 3 and 7, and has a hole center line that is approximately the same diameter as the inner diameter of the tube 1 and perpendicular to the center line of the tube. It is.

After this drilling, the main shaft 6 is housed in the drilling device 5, the water control valve 4 is closed, and as shown in FIG.
This drilling device 5 is removed from the anti-icing valve.

4 and 5 show the procedure for attaching the gate valve body 9 to the outer valve box 2. As shown in FIG.

As shown in FIG. 4, the lower end of a bell-shaped valve installation case 11 with an open bottom is removably fixed to the upper surface of the valve box 4' of the water control valve.

An operating rod 12 is held through the center of the top surface of the outer casing 11 so as to be relatively slidable, and the upper end of a valve rod 13 is fitted and connected to the lower end 12' of this operating rod 12. 13 is held through the valve cover 10 so that it can only rotate freely.

A threaded portion is formed in the lower part of the valve stem 13 and is threaded into the center of the top surface of the gate valve body 9.

In this way, the valve stem 13, valve cover 10,
The gate valve body 9 is stored in an assembled state.

The state shown in FIG. 4 is the state in which the water control valve 4 is opened after the outer casing 11 is fixed to the valve box 4' of the water control valve 4.

Next, by pushing the operating rod 12 downward, the valve cover 10 and the gate valve body 9 assembled to the valve stem 13 are brought into the valve chamber 8 through the water control valve 4, and the valve A state in which the lid 10 is brought into contact with the upper surface 3' of the flange 3 is shown in FIG.

After fixing the valve lid 10 to this flange 3,
A state in which the water control valve 4 and the outer case 11 are removed from the outer valve box 2 is shown in FIGS. 6 and 7.

The main parts of the embodiment of the present invention are shown in Figs. 6 and 7 below.
This will be explained with reference to the figures.

A rubber lining 15 is applied to the entire outer circumference of the gate valve body 9 except for the top portion 9'.

The body portion 9a has a substantially cylindrical outer diameter having the same diameter as the circular hole 7'.

The distal end surface portion 9b of the body portion 9a is formed into a hemispherical convex curved surface having the same diameter as the inner diameter of the tube 1.

A rib 16 is formed around the entire circumference of the top surface portion 9', and this rib 16 is shaped to be pressed against the outer peripheral edge of the circular hole 7' when the gate valve body 9 is in the closed position. be.

Further, the lower part of the valve stem 13 is inserted into the hollow interior of the gate valve body 9, and by its rotation, the valve stem 13 aligns the gate valve body 9 with the hole center line of the circular hole 7'. It opens and closes by moving up and down along the line.

The valve cover 10 has an inverted bowl shape and has the function of enlarging the valve chamber 3 to a size that allows the gate valve body 9 to be accommodated therein.

Figure 8 shows a typical water pipe and is marked with an X in the figure.

This shows that the valve is attached to the intermediate portion of the pipe indicated by X as described above.

[Brief explanation of the drawing]

Figures 1, 2, 3, 4, 5, and 6 are longitudinal cross-sectional views for explaining the operating sequence of this invented device, and Figure 7 is a cross-sectional view taken along line 1-I in Figure 6. Show the diagram. Moreover, FIG. 8 shows an explanatory diagram of the piping state of a general water pipe. 1...Pipe, 7'...Circular hole, 2...
... Valve box, 10 ... Valve lid, 13 ... Valve stem, 9 ... Gate valve body, 9a ... Body,
9b...Tip surface part.

Claims (1)

[Scope of utility model registration request] A circular hole 7' having approximately the same diameter as the inner diameter of the circular tube 1 is bored in one side of the circular tube 1 with a hole center line perpendicular to the tube center line of the circular tube 1. A surrounding valve box 2 is fixed to the outer periphery of the circular pipe 1, and a gate valve body 9 is held in the valve body 2 so as to be concentric with the circular hole 7' and movable in the direction of its center line. The outer periphery of the valve body 9 is formed of an elastic seal 15 that comes into elastic contact with the inner wall surface of the pipe 1, and the body part 9a of the gate valve body 9 is formed in a substantially cylindrical shape, and the tip surface part 9b is formed in a substantially spherical shape. structure.