JP2001065733A - Air valve with valve used in repairing said air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy mounting/demounting of each valve by lowering the mounting position of a repairing valve (wafer type butterfly valve) on a fluid transport pipe line for decreasing the mounting depth in a manhole through holding the wafer type butterfly valve with a plate flange to a flange part of the line as well as fixation of an air valve to a plate flange. SOLUTION: A fixation bolt 15 is inserted in from a bolt through hole of a plate flange 2, and it is made to penetrate a bolt insertion hole of a wafer type butterfly valve 1 and a bolt insertion hole of a flange part 10 on a fluid transport pipe line 9, in order, and fixed by a nut 20. Since an upper surface 21 of the flange 2 is held flat at this time, the fixation to an air valve 3 is made easy and the good seal performance can be assured. The air valve 3 is made to abut on the upper surface 21 via a gasket 22, then a fixation bolt 16 is inserted into a bolt insertion hole 23 of the valve 3, and threadwise engaged with a nut 17 embedded in a bottom face through the bolt insertion hole of the flange 2, thereby fixing the valve 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve with a repair valve used for a pipeline for transporting fluid such as clean water, agricultural water, seawater, and chemicals.

[0002]

2. Description of the Related Art An air valve used in a fluid transport piping line is attached to a flange portion of the fluid transport pipeline via a fluid sealing valve (hereinafter, referred to as a repair valve). When the pneumatic valve is repaired, the repair work is performed while the outflow of the fluid from the fluid transport piping line is temporarily stopped by the repair valve. Conventionally, as an example of the repair valve, a butterfly valve having a flange portion integrally formed above and below the valve (hereinafter, referred to as a flange type butterfly valve) has been used.

When the flange type butterfly valve (repair valve) is attached to a fluid transportation piping line, a flange portion below the flange type butterfly valve and a flange portion of the fluid transportation piping line are connected to each other via a gasket with bolts and nuts. And a method in which the flange portion above the flange type butterfly valve and the flange portion of the air valve are fixed to each other by bolts and nuts via a gasket. When repairing the air valve, it is necessary to close the flange type butterfly valve, remove the bolts and nuts that fix the flange part of the flange type butterfly valve and both flange parts of the air valve, and perform the repair. was there.

[0004]

Accordingly, the air valve with a repair valve having the above-described structure has the following problems. (1) The flange portion is integrally formed above and below the repair valve, and the dimension between the upper and lower surfaces of the repair valve is increased. Therefore, the position of the air valve mounted on the fluid transport piping line is increased.
Therefore, in order to accommodate the air valve in the manhole without any excess or shortage, it is necessary to make the manhole deep, and the excavation cost increases. (2) Since it is necessary to fix both the fluid transport piping line and the repair valve, and both the repair valve and the air valve with bolts and nuts, much labor is required and the mounting workability is very poor. The present invention has been made in view of the above problems of the prior art,
The purpose of the repair is to lower the mounting position of the repair valve on the fluid transport piping line to reduce the installation depth in the manhole and to easily install and remove the repair valve and the air valve. It is to provide a pneumatic valve with a valve.

[0005]

For this reason, the air valve with a repair valve of the present invention is provided on a flange portion of a fluid transport piping line.
A wafer-type butterfly valve is sandwiched by a plate flange and fixed with bolts and nuts, and an air valve is fixed to the plate flange with bolts, nuts or bolts. It is characterized in that a plurality of screw holes are formed. In addition, as a material of the air valve with a repair valve, plastic such as hard vinyl chloride resin, metal, or the like is suitably used, but is not particularly limited.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to the embodiments. FIG. 1 is a front view including a partial cross-section showing a state in which an air valve with a repair valve according to the present invention is mounted on a fluid transportation piping line, FIG. 2 is a plan view of a wafer type butterfly valve, and FIG. FIG. 4 is a bottom view of the plate flange of FIG.

In FIG. 1, reference numeral 1 denotes a wafer-type butterfly valve serving as a repair valve. As shown in FIG. 2, a flow path 5 is formed at the center of a valve body 4, and an inner peripheral surface of the flow path 5 and the valve body are formed. A seat ring 6 made of EPDM or the like is fitted to the inner surface of the. Numeral 7 denotes a disc-shaped valve body which is rotatably supported on a valve shaft in the valve body 4. Further, four bolt through holes 8 are provided on the outer periphery of the valve body 4 at equal intervals in the circumferential direction.

[0008] 2 is the wafer type butterfly valve 1 by the flange portion 10 provided in the fluid transport piping line 9,
It is a plate flange that is clamped and fixed. A flow path 11 is provided at the center of the plate flange 2, and eight bolt through holes 12 are provided at equal intervals in the circumferential direction on the peripheral surface. 13 and 14 are burial holes having a diameter larger than that of the bolt through hole 12 and formed in a hexagonal shape at a depth at which the head of the fixing bolt 15 or the nut 17 is buried. Eight alternate locations are provided. The burial hole in which the nut 17 is buried need not necessarily be hexagonal, but may be a screw hole. In this case, fixing can be performed by screwing the bolt (see FIGS. 3 and 4).

Reference numeral 3 denotes an air valve fixed to the plate flange 2 with bolts 16 and nuts 17. The air valve 3 may be any as long as it has the flange portion 18, and its structure is not limited.

The wafer type butterfly valve 1, plate flange 2, air valve 3, and fluid transport piping line 9 are fixed in the following procedure. First, a nut 17 is attached to the burial hole 14 provided on the bottom side 22 of the plate flange 2, and the plate flange 2, the wafer type butterfly valve 1, and the fluid transport piping line 9 are fixed. The fixing bolt 15 is inserted through the bolt through hole 12 of the plate flange 2, and is passed through the bolt through hole 8 of the wafer type butterfly valve 1 and the bolt through hole 19 of the flange portion 10 of the fluid transport piping line 9.
Fixed at 0. At this time, the head of the fixing bolt 15 is buried in the burial hole 13, and the upper surface 21 of the plate flange 2 is held flat. Since the upper surface 21 of the plate flange 2 is held flat, it can be easily fixed to the air valve 3 and the sealing property can be secured. However, it goes without saying that it is not always necessary to make the upper surface 21 and the head of the fixing bolt 15 flush with each other depending on the shape and thickness of the sealing material such as the gasket 22 attached at the time of fixing.

Next, the air valve 3 is brought into pressure contact with the plate flange 2 via the gasket 22 with the upper surface 21 of the plate flange 2, and the fixing bolt 16 is inserted into the bolt through hole 23 of the air valve 3, and the bolt through The nut 17 is screwed into the burial hole of the bottom surface 24 through the hole 12. When the female screw portion 25 is provided on the inner peripheral surface of the bolt through hole 12 of the plate flange 2, the air valve 3 is fixed to the plate flange 2 via a gasket 22 by pressing the air valve 3 against the plate flange 2. Then, the fixing bolt 16 is passed through the bolt through hole 23 of the air valve 3 and screwed into the female screw portion 25 of the plate flange 2 (see FIG. 5). When the air valve 3 is to be removed for repair, it goes without saying that after the wafer type butterfly valve 1 is closed, an operation reverse to the above operation may be performed.

[0012]

The air valve with a repair valve according to the present invention has the above-described structure, and the use of the air valve according to the present invention provides the following excellent effects. (1) The wafer-type butterfly valve has a smaller inter-plane dimension than the flange-type butterfly valve, so that the position of the air valve is kept low. Therefore, it is not necessary to make the manhole deep, and the excavation cost is reduced. (2) When attaching and detaching the air valve, it is only necessary to remove the nut provided on the bottom surface of the plate flange or the bolt for fixing the air valve, which is screwed into the female thread, so that the work is extremely simple. Can be done. Therefore, a reduction in construction cost steps during construction and workability during repair are improved.

[Brief description of the drawings]

FIG. 1 is a front view including a partial cross section showing an embodiment of the present invention.

FIG. 2 is a front view of a wafer type butterfly valve.

FIG. 3 is a top view of the plate flange in FIG. 1;

FIG. 4 is a front view of a plate flange in FIG. 1;

FIG. 5 is a front view including a partial cross section showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wafer type butterfly valve (repair valve) 2 Plate flange 3 Air valve 4 Valve main body 5 Flow path 6 Seat ring 7 Valve 8 Bolt through hole 9 Fluid transport piping line 10 Fluid transport piping line flange 11 Flow path 12 Bolt penetration Hole 13 Buried hole 14 Buried hole 15 Fixing bolt 16 Nut 17 Fixing bolt 18 Flange part of air valve 19 Bolt through hole 20 Nut 21 Upper surface of plate flange 22 Gasket 23 Bolt through hole 24 Bottom surface of plate flange 25 Female screw portion

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H025 BA21 BB01 3H055 AA06 AA22 BC01 CC03 CC15 GG22 GG27 JJ19 3H066 AA02 BA18 BA38

Claims (2)

[Claims] A wafer type butterfly valve is sandwiched by a plate flange at a flange portion of a fluid transport piping line and fixed by bolts and nuts, and an air valve is fixed to the plate flange by bolts, nuts or bolts. An air valve with a repair valve. 2. The air valve with a repair valve according to claim 1, wherein a plurality of screw holes are formed in the plate flange.