JPH11325268A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve capable of easily fixing a valve box seat. SOLUTION: An annular valve box seat 22 is arranged at the opening peripheral edge of a communication port in a valve box 1 and a repair valve event 21 is provided to be rotatable around the axial center of a valve rod 13. For the repair valve element 21, a plug body 23 pressed against the valve box seat 22 to close the communication port 4 and an annular body 24 having an opening 24a for opening the communication port 4 and pressed against the valve box seat 22 are provided. The plug body 23 and the annular body 24 are integrally formed and their outside faces pressed against the valve box seat 22 are formed in a spherical shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve provided in a water pipe.

[0002]

2. Description of the Related Art Conventionally, there is an air valve provided at a rising portion of a water pipe which is provided with a water tap such as a fire hydrant. In case of emergency, water in the pipeline is taken out by a water tap.

As this type of air valve, there is one as shown in FIGS. 5 to 6, the air valve is
A fire hydrant 3 provided with a ball valve body 2 is provided in communication with a side portion of the valve box 1. The valve box 1 has a communication port 4 formed at a lower portion thereof for communicating with a pipe (not shown) for water supply and sewerage, and a large air hole 5 formed at an upper portion thereof for communicating with the atmosphere.

A repair valve 6 for opening and closing the communication port 4 and a guide cylinder 7 are arranged inside the valve box 1.
A floating valve body 8 that opens and closes the large air hole 5 and a float valve body 10 that opens and closes a small air hole 9 formed at the center of the floating valve body 8 are arranged inside the inside of the inside thereof so as to be movable up and down. A cover 11 that covers the large air hole 5 is provided on the upper part of the valve box 1, and a protective cap 12 is put on a hose connection port of the fire hydrant 3.

The repair valve element 6 is disposed in a gap formed between the valve box 1 and the guide cylinder 7, and is mounted on a spherical plug 6 a for opening and closing the communication port 4 and a valve rod 13. And a supporting portion 6b. A valve box sheet 14 is provided on the periphery of the opening of the communication port 4 of the valve box 1 when the valve box 1 is fully closed and pressed against the plug body 6a. The valve stem 13 is connected to the operating device 15 at one end, and a cap 16 is provided on the input shaft of the operating device 15. A stopper pin 17 is provided in the middle of the valve stem 13, and a boss portion of the valve box 1 is provided on the boss portion as shown in FIG.
An engagement groove 18 is provided to lock the stopper pin 17 at the fully opened position and the fully closed position of the repair valve body 6.

In the above configuration, when checking the internal parts of the air valve, the repair valve 6 is in the fully closed position (shown by a solid line in FIG. 5), and the plug 6a is pressed against the valve box sheet 14. The communication port 4 is closed with. Normally, the repair valve element 6 is in the fully open position (indicated by a two-dot chain line in FIG. 5), and water and air flowing through the pipe flow into the valve box 1 through the communication port 4. The floating valve element 8 initially has a float valve element 10.
The large air hole 5 is closed by receiving the buoyancy of the valve, and the closed state is maintained by the pressure inside the valve box. The water level in the valve box decreases with the inflow of air, and the float valve element 10 descends as the water level decreases to open the small air holes 9 of the floating valve element 8 and exhaust the air in the valve box. . When the water level rises with the exhaust, the float valve body 10 returns to the closed position.

In an emergency, with the repair valve 6 in the fully opened position, the protective cap 12 is removed, the hose is connected to the fire hydrant 3, and then the ball valve 2 is opened.

[0008]

By the way, normally, the repair valve body 6 is in a state of being separated from the valve box sheet 14, and the valve box sheet 14 is exposed to the flow of water from the pipeline. At this time, since the water flow flowing from the pipeline acts in a direction to separate the valve box sheet 14 from the valve box 1, in order to prevent the valve box sheet 14 from being detached, the valve box 1 is pressed by a sheet retainer, an adhesive, or the like. It is fixed to. However, fixing with an adhesive will cause the adhesive to deteriorate over time,
It is not reliable, and mechanical fixing by sheet pressing requires a member for fixing to be disposed in a narrow area of the valve box 1 around the communication port 4, and has a problem of a complicated structure.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an air valve capable of easily fixing a valve box sheet.

[0010]

In order to solve the above-mentioned problems, an air valve according to the present invention has a communication port at the bottom of a valve box communicating with a pipeline, and opens and closes the communication port in the valve box. In an air valve having a repair valve body, an annular valve box sheet is arranged around the opening edge of the communication port, and the repair valve body is rotatably provided around the axis of the valve stem, and the repair valve body is provided on the valve box sheet. A plug body that presses and closes the communication port and an annular body that has an opening that opens the communication port and presses against the valve box sheet are provided, and the plug body and the annular body are integrally formed, The outer surface that is pressed against the valve box sheet is formed in a spherical shape.

With the above configuration, when the repair valve is fully closed, the repair valve is rotated about the axis of the valve stem, and the communication port is closed while pressing the valve box sheet with the stopper. When the repair valve body is fully opened, the repair valve body is rotated about the axis of the valve stem, and the communication port is opened at the opening while pressing the valve box sheet with the annular body.

The repair valve body is always in pressure contact with the valve box sheet in all the steps when fully opened, fully closed, when shifting from the fully open state to the fully closed state, and when shifting from the fully closed state to the fully open state. The valve box sheet is fixedly held on the valve box. Therefore, even if the water flow flowing into the valve box through the communication port when fully opened acts on the valve box sheet as a force in the direction of separating from the valve box, the valve box sheet does not separate, and the pressing force by the repair valve body is maintained. Since the valve box sheet is fixed to the valve box, the structure for directly fixing the valve box sheet and the valve box is not required, and the structure around the valve box sheet can be simplified.

Further, since the outer surface of the plug body portion and the annular body portion pressed against the valve box sheet has a spherical shape, the transition from the fully open state to the fully closed state and the transition from the fully closed state to the fully open state. At times, the repair valve body can be smoothly rotated about the axis of the valve stem while pressing the valve box sheet.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. Members performing the same operations as those described above with reference to FIGS. 5 to 7 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1 to FIG. 4, the pneumatic valve is provided with a repair valve element 21 for opening and closing the communication port 4 inside the valve box 1 so as to be rotatable around the axis of the valve rod 13. An annular valve box sheet 22 made of an elastic material such as resin is fitted and disposed in a counterbore portion 4a formed on the periphery of the opening of the communication port 4.

As shown in FIG. 3 and FIG.
Is formed integrally with the plug body 23, the annular body 24 and the support 25. The plug body 23 presses against the valve box sheet 22 when fully closed to close the communication port 4, and the annular body section 24 presses against the valve box sheet 22 when fully opened, and opens the communication port 4 at the opening 24a. And the support portion 25 is
And a connecting portion for The outer surface of the plug body 23 and the annular body 24 that is pressed against the valve box sheet 22 is formed in a spherical shape.

With the above configuration, as shown in FIG.
When the repair valve 21 is fully closed, the communication port 4 is closed while the valve body sheet 22 is pressed by the plug 23. As shown in FIG. 1, when the repair valve body 21 is fully opened, the communication port 4 is opened at the opening 24 a while pressing the valve box sheet 22 with the annular body portion 24. Further, at the time of transition from the fully open state to the fully closed state, and at the time of transition from the fully closed state to the fully open state,
The repair valve 21 is rotated around the axis of the valve rod 13 while pressing the valve box sheet 22 on the spherical outer surface of the annular body 24.

Therefore, the repair valve body 21 is always in the valve box seat 22 in all the steps of the fully open state, the fully closed state, the transition from the fully open state to the fully closed state, and the transition from the fully closed state to the fully open state. , And the valve box sheet 22 is fixedly held at the periphery of the opening of the communication port 4. Therefore, even when the valve box sheet 22 is exposed to the water flowing into the inside of the valve box 1 through the communication port 4 when fully opened, the valve box sheet 22 does not separate from the valve box 1. Moreover, since the valve box sheet 22 is always fixed to the valve box 1 by the pressing force of the repair valve element 21, the fixing between the valve box sheet 22 and the valve box 1 is performed directly by using a separate member such as a sheet retainer. The structure may not be necessary, the structure around the valve box sheet is simplified, or the fixing force between the valve box sheet 22 and the valve box 1 does not deteriorate due to aging like an adhesive.

[0019]

As described above, according to the present invention, when the repair valve element is fully opened, fully closed, at the time of transition from the fully open state to the fully closed state, or at the time of the transition from the fully closed state to the fully open state. In all the processes, the valve box sheet is always pressed against the valve box sheet, and the valve box sheet is fixedly held on the valve box, so that the valve box sheet does not come off from the valve box, and the valve box sheet is attached to the valve box. Is
It only needs to be fitted into the opening edge of the communication port,
The mounting structure is simplified.

[Brief description of the drawings]

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

FIG. 2 is a vertical sectional view of the air valve.

FIG. 3 is a partially cutaway sectional view showing a configuration of a repair valve body.

FIG. 4 is a view as viewed in the direction of arrows AA in FIG. 3;

FIG. 5 is a sectional view showing a conventional air valve.

FIG. 6 is a sectional view showing the air valve.

FIG. 7 is an enlarged view of a main part showing a configuration of a stopper pin of the air valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 4 Communication port 4a Counterbore part 13 Valve stem 21 Repair valve body 22 Valve box sheet 23 Plug body part 24 Annular body part 24a Opening 25 Support part

Claims (1)

[Claims] 1. An air valve having a communication port at the bottom of a valve box and a repair valve body for opening and closing the communication port in the valve box, wherein an annular valve box is provided at an opening edge of the communication port. The seat is arranged, the repair valve body is provided rotatably around the axis of the valve stem, and the repair valve body is provided with a plug portion for pressing the valve box sheet to close the communication port and an opening for opening the communication port. An annular body that is pressed against the valve box sheet, the plug body and the annular body are integrally formed, and the outer surface that is pressed against the valve box sheet is formed in a spherical shape. Air valve.