JP3873254B2 - Water pressure / blowing-out shared jig and test method using it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jig used when performing a water pressure test and blowing out of valves, and more particularly to a jig that can be used for both a water pressure test and blowing out and a test method using the jig.
[0002]
[Prior art]
In various facilities and plants, many piping systems are laid, and these piping systems are mainly composed of piping and valves. Valves include on-off valves, gate valves, pneumatically driven and hydraulically controlled valves, etc. Generally, these valves (hereinafter simply referred to as valves) are valve bodies (referred to as valve bodies or valve bonnets). And a valve stem provided with a valve portion at the tip, and an automatic or manual operation portion for operating the valve stem.
[0003]
The valve performs passage and blocking of the fluid flowing through the piping system, or adjusts the flow rate, but the fluid pressure in the piping system may be different between the inlet side and the outlet side of the valve. For example, in the case of a piping system that supplies makeup water to an open water tank, the pressure on the inlet side of the valve that regulates makeup water is high, but the outlet side is close to atmospheric pressure.
The piping system is tested for water pressure after laying. As described above, the water pressure test for a valve with a high pressure on the inlet side is usually performed by applying the test water pressure to the inlet side with the valve stem part removed from the valve body, and not applying the test water pressure to the outlet side. Is adopted.
[0004]
FIG. 2 is a cross-sectional view showing a state where the valve stem portion is removed from the valve body. The valve body 1 includes a fluid inlet portion 2, a fluid outlet portion 3, a valve seat 4 disposed therebetween, a valve rod insertion opening 5 provided above the valve seat 4, and an outer periphery of the opening 5. It has the flange 6 provided in. Then, the fluid flows in from the fluid inlet portion 2 and flows out from the fluid outlet portion 3 through the valve seat 4.
[0005]
A plurality of bolt holes 7 are formed in the flange 6 at predetermined intervals in the circumferential direction. On the other hand, a valve flange portion (not shown) is provided with a companion flange, and the companion flange is also formed with a plurality of bolt holes at predetermined intervals in the circumferential direction. The valve rod portion is attached to the valve body 1 by matching the bolt hole of the companion flange with the bolt hole of the flange 6 and fastening with a bolt nut.
[0006]
FIG. 3 is a cross-sectional view showing a state in which a conventional water pressure test jig is mounted on the valve body 1 of FIG. The jig 8 is generally called a “closing trim”, and has a cylindrical peripheral wall 9 and an upper plate 10 having a step formed integrally. The upper plate 10 is provided with an air vent hole 11, and a stopper plug 12 is screwed into the air vent hole 11.
[0007]
In order to mount the jig 8 on the valve body 1, first, the jig 8 is inserted into the opening 5 from above, and the lower edge of the peripheral wall 9 is brought into close contact with the peripheral edge of the valve seat 4 via the O-ring 13. . Next, a ring-shaped pressing plate 15 is attached to the upper plate 10 of the jig 8 via a gasket 14, and the jig 8 is attached to the valve body 1 with a plurality of bolts and nuts 16. When the jig 8 is thus attached to the valve body 1, the valve seat 4 is closed and the preparation for the water pressure test is completed.
[0008]
The water pressure test is performed by applying a test water pressure from the upstream side of the pipe connected to the fluid inlet 2. To perform the water pressure test, first, the stopper plug 12 is removed and the air vent hole 11 of the upper plate 10 is opened. Next, when test water pressurized by a pump or the like is supplied from the pipe to the fluid inlet 2 of the valve body 1, the air inside the pipe and the valve body 1 is released to the outside from the air vent hole 11. When test water is ejected from the air vent hole 11, the stopper plug 12 is attached to the air vent hole 11 again. Then, a predetermined water pressure is applied from the fluid inlet portion 2 of the pipe and the valve body 1 to the primary side of the valve seat 4, that is, a portion to which fluid pressure is applied during normal operation. When the water pressure test is finished, the pressurization of the test water is stopped.
[0009]
Next, after the water pressure test is completed, blowing out is performed. This is performed for the purpose of eliminating so-called welding blades and foreign matters such as scales generated in the pipes when the pipes are laid by welding. At this time, compressed air, water, water vapor or the like is circulated in the pipe.
And since blowing out needs to be carried out from the upstream side of the pipe to be subjected to the water pressure test to the inside of the valve body 1, normally, pressurized air, water, etc. are supplied from the upstream side of the pipe, To discharge. At that time, in order to discharge the test water to the outside without discharging from the fluid outlet portion 3 of the valve body to the downstream pipe, or to discharge only to a predetermined drainage facility, another jig is attached to the valve body 1. Installing.
[0010]
FIG. 4 is a cross-sectional view showing a state where a blowing-out jig is mounted on the valve body 1. 3 to 4, first, the bolts and nuts 16 shown in FIG. 3 are removed, and the push plate 10 is removed from the valve body 1. Next, after the jig 8 for water pressure test is pulled out from the valve body 1 and taken out, a blowing-out jig 17 is attached to the valve body 1 as shown in FIG.
[0011]
The blowing-out jig 17 includes a cylindrical main body 18 and a companion flange 19 provided outside the intermediate portion of the main body 18. In order to attach the jig 17 to the valve main body 1, first, the main body 18 is inserted from the opening 5 of the valve main body 1, and the lower peripheral edge of the main body 18 is inserted into the peripheral edge of the valve seat 4 via the O-ring 13. Close contact with. Next, the companion flange 19 and the flange 6 of the valve body 1 are connected by a bolt and nut 19a.
[0012]
In order to perform blowing out in the state of FIG. 4, first, pressurized air is supplied from the upstream side of the pipe, and test water staying inside the pipe is caused to flow into the fluid inlet portion 2 of the valve body 1. The test water that has flowed in from the fluid inlet 2 flows into the main body 18 of the jig 17 through the valve seat 4 and is discharged from the tip of the main body 18 to the outside. When draining to a drainage facility, a hose or the like is connected to the tip of the main body 18.
[0013]
[Problems to be solved by the invention]
However, the above method has a problem in that the cost is increased because two types of jigs 8 for water pressure testing and a jig 17 for blowing out need to be prepared. Further, when moving from the water pressure test to blowing out, there is a problem that the work efficiency is lowered because two kinds of jigs need to be replaced.
[0014]
Then, this invention makes it a subject to solve the said problem in the conventional jig | tool, and it aims at providing the new jig | tool for it. Another object of the present invention is to provide a method for performing a water pressure test and blowing out using the jig.
[0015]
[Means for Solving the Problems]
The jig according to the present invention for solving the above problems includes a fluid inlet part, a fluid outlet part, a valve seat disposed between the fluid inlet part and the fluid outlet part, and an opening provided above the valve seat. A common jig for performing a water pressure test and blowing out of a valve body having a flange provided on the outer periphery of the opening.
The common jig includes a cylindrical body that can be inserted from the opening, a companion flange provided on an outer periphery of the middle part of the cylindrical body, and a lid that is detachably attached to an upper end of the cylindrical body. In a state in which the valve seat is closed by the front end edge of the body, the cylindrical body can be flange-coupled to the valve body using the companion flange (claim 1).
[0016]
In the shared jig, a plurality of bolt holes are formed in the lid, a companion flange is provided at an upper end of the cylinder, and the lid can be flange-coupled to the cylinder using the companion flange. (Claim 2).
[0017]
Further, the method of using the shared jig according to the present invention for solving the above problems includes a fluid inlet part, a fluid outlet part, a valve seat disposed between the fluid inlet part and the fluid outlet part, and an upper part of the valve seat. This is a method for performing a water pressure test and blowing out of a valve body having an opening provided in the valve and a flange provided on the outer periphery of the opening.
And this method inserts the said shared jig from the opening part of a valve main body, closes a valve seat by the front-end | tip edge of the cylinder, uses a companion flange, and flange-joins a cylinder to a valve main body, A water pressure test is performed by applying water pressure from the fluid inlet with the lid attached to the upper end of the tube, and after the water pressure test, the lid is removed from the cylinder and directed from the fluid inlet to the upper end of the cylinder. And blowing out (claim 3).
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a state where a shared jig 20 according to the present invention is mounted on a valve body 1. The valve body 1 to which the shared jig 20 according to the present invention is applied is the same as that shown in FIG. 2, and includes a fluid inlet portion 2, a fluid outlet portion 3, a valve seat 4 disposed therebetween, and a valve seat 4. It has a valve rod insertion opening 5 provided above and a flange 6 provided on the outer periphery of the opening 5, and a plurality of bolt holes 7 are formed in the flange 6 at predetermined intervals in the circumferential direction.
[0019]
The shared jig 20 has a bottomed cylinder 21 that is dimensioned to be inserted from the opening 5 of the valve body 1, a companion flange 23 provided on the outer periphery of the intermediate part of the cylinder 21, and an upper end of the cylinder 21. A lid 30 that is detachably attached and a companion flange 24 provided on the outer periphery of the upper end of the cylinder 21 are provided. An air vent hole 31 penetrates through the central portion of the lid 30, and the air vent hole 31 can be closed by screwing a stopper plug 32 into an internal thread portion formed in the upper portion thereof.
[0020]
The cylinder 21 is formed by joining a lower cylinder 25 and an upper cylinder 26 by welding in this example. In addition, these can also be manufactured integrally by processing a metal block, for example.
The lower cylinder 25 is provided with the companion flange 23 on the upper outer periphery thereof. The seat 4 can be closed by seating the leading edge of the lower cylinder 25 on the peripheral edge of the valve seat 4. The companion flange 23 is provided for detachably mounting the common jig 20 on the flange 6 of the valve body 1. That is, a plurality of bolt holes provided at a predetermined interval in the circumferential direction of the phase flange 23 and a plurality of bolt holes provided at a predetermined interval in the circumferential direction of the flange 6 of the valve body 1 are aligned with each other and fastened by a bolt nut 29. Thus, the common jig 20 is flange-coupled to the valve body 1.
[0021]
Further, as described above, the companion flange 24 is provided on the outer periphery of the upper end portion of the upper cylindrical body 26, and a flat lid 30 can be detachably attached to the companion flange 24. That is, a plurality of bolt holes 30a are provided at a predetermined interval in the circumferential direction of the lid body 30, and the bolt holes 30a and a plurality of bolt holes provided at a predetermined interval in the circumferential direction of the companion flange 24 are aligned with each other. The lid 30 is flange-coupled to the cylindrical body 21 by fastening at.
[0022]
In order to attach the common jig 20 to the valve body 1 as shown in FIG. 1, first, the cylinder body 21 is mounted in a state where the lid body 30 is attached to the upper end portion of the upper cylinder body 26 with the bolt nut 33 via the gasket 34. The valve seat 4 is inserted into the valve body 1 through the opening 5 and the valve seat 4 is closed at the leading edge of the lower cylindrical body 25 through the O-ring 35. Next, the common flange 20 is attached to the valve body 1 by aligning the companion flange 23 of the lower cylindrical body 25 with the flange 6 of the valve body 1 via the gasket 36 and fastening with the bolt and nut 29.
[0023]
Next, a method of performing a water pressure test and blowing out of the valve main body 1 (and the pipe connected to the fluid inlet portion 2) with the common jig 20 as shown in FIG. 1 will be described.
[0024]
(Water pressure test)
First, the method of the water pressure test will be described. First, the closing plug 32 of the lid 30 is removed, and the air vent hole 31 is opened. Next, when test water pressurized by a pump or the like is supplied from the pipe to the fluid inlet 2 of the valve body 1, the air inside the pipe and the valve body 1 is released to the outside through the air vent hole 31. When the test water is ejected from the air vent hole 31, the stopper plug 32 is attached to the air vent hole 31 again. In this state, a predetermined water pressure can be applied from the fluid inlet portion 2 of the pipe and the valve body 1 to the primary side of the valve seat 4, that is, the portion to which the fluid pressure is applied during normal operation. When the water pressure test is finished, the pressurization of the test water is stopped.
[0025]
(Blowing out)
Next, the blowing out method will be described. First, the bolts and nuts 33 are removed, and the lid 30 is removed from the upper cylindrical body 26. In addition, when discharging waste water to the waste water treatment apparatus, the upper side of the upper cylindrical body 26 is inserted and connected to an end portion of a dedicated hose or the like. Next, when pressurized air is supplied from the upstream side of the pipe, the test water staying in the pipe is blown and flows into the fluid inlet 2 of the valve body 1, and then enters the common jig 20 through the valve seat 4. , Discharge from the upper end to the outside. Next, water, water vapor, or the like is introduced into the pipe, and foreign matters such as welding blades and scales in the pipe are completely discharged to the outside.
[0026]
【The invention's effect】
As described above, the shared jig according to the present invention is detachable from the bottomed cylinder that can be inserted from the opening of the valve body, the companion flange provided on the outer periphery of the intermediate part of the cylinder, and the upper end of the cylinder. It has a lid to be attached to. And by mounting this shared jig on the valve body, the water pressure test of the valve body and the subsequent blowing out can be carried out continuously with the same jig. Therefore, it is not necessary to prepare two kinds of jigs for a hydraulic pressure test and a blowing-out as in the prior art, and when switching from a hydraulic pressure test to a blowing-out, the conventional jig exchanging work becomes unnecessary.
[0027]
In the shared jig, a plurality of bolt holes can be formed in the lid, a companion flange is provided at the upper end of the cylinder, and the lid can be flanged to the cylinder using the companion flange. In this way, the lid body can be attached to the cylinder body with high pressure resistance, and the attachment / detachment thereof can be quickly performed only with the bolts and nuts.
[0028]
Further, the method of using the shared jig according to the present invention includes inserting the shared jig from the opening of the valve body, closing the valve seat at the leading edge of the cylinder, and using the companion flange to form a cylinder. Is connected to the valve body with a flange, and a water pressure test is performed by applying water pressure from the fluid inlet with the lid attached to the upper end of the cylinder. After the water pressure test, the lid is removed from the cylinder, and the fluid inlet Blowing out is performed from the portion side toward the upper end of the cylinder.
[0029]
According to this method, the water pressure test of the valve body and the subsequent blowing out can be continuously performed with the same jig. Therefore, it is not necessary to prepare two kinds of jigs for a hydraulic pressure test and a blowing out as in the prior art, and the conventional jig exchanging work is not required when switching from the hydraulic pressure test to the blowing out.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a shared jig 20 according to the present invention is mounted on a valve body 1. FIG.
FIG. 2 is a cross-sectional view showing a state where a valve stem portion is removed from a valve body.
3 is a cross-sectional view showing a state in which a conventional water pressure test jig is mounted on the valve body 1 of FIG. 2;
4 is a cross-sectional view showing a state where a conventional blowing-out jig is attached to the valve body 1 of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 2 Fluid inlet part 3 Fluid outlet part 4 Valve seat 5 Opening part 6 Flange 7 Bolt hole 8 Jig 9 Perimeter wall 10 Upper plate 11 Air vent hole 12 Closure plug 13 O ring 14 Gasket 15 Push plate 16 Bolt nut 17 Tool 18 Body 19 Companion flange 19a Bolt nut 20 Shared jig 21 Cylindrical body 23 Lid body 24 Companion flange 25 Lower tubular body 26 Upper tubular body 29 Bolt nut 30 Lid body 30a Bolt hole 31 Air vent hole 32 Closure plug 33 Bolt nut 34 Gasket 35 O-ring 36 Gasket

Claims (3)

A fluid inlet 2, a fluid outlet 3, a valve seat 4 disposed between the fluid inlet 2 and the fluid outlet 3, an opening 5 provided above the valve seat 4, and an outer periphery of the opening 5 A jig for performing a water pressure test and blowing out of the valve body 1 having a flange 6 provided on
A cylindrical body 21 that can be inserted from the opening 5, a companion flange 23 provided on the outer periphery of the intermediate portion of the cylindrical body 21, and a lid body 30 that is detachably attached to the upper end of the cylindrical body 21, A hydraulic pressure / blowing-out shared jig characterized in that the cylindrical body 21 can be flange-coupled to the valve body 1 using the companion flange 23 in a state in which the valve seat 4 is closed by the leading edge. In Claim 1, a plurality of bolt holes 30a are formed in the lid body 30, a companion flange 24 is provided at the upper end of the tubular body 21, and the lid body 30 is flanged to the tubular body 21 using the companion flange 24. A hydraulic / blowing-out shared jig that is constructed so that it can be joined. A fluid inlet 2, a fluid outlet 3, a valve seat 4 disposed between the fluid inlet 2 and the fluid outlet 3, an opening 5 provided above the valve seat 4, and an outer periphery of the opening 5 A method for performing a water pressure test and blowing out of a valve body 1 having a flange 6 provided on
The common jig according to claim 1 or 2 is inserted from the opening 5 of the valve body 1, the valve seat 4 is closed by the leading edge of the cylindrical body 21, and the cylindrical body 21 is removed using the companion flange 23. A water pressure test is performed by applying a water pressure from the fluid inlet 2 in a state where the valve body 1 is flange-coupled and a lid 30 is attached to the upper end portion of the cylinder 21, and after the water pressure test, the lid 30 is removed from the cylinder 21. The water pressure test and the blowing-out method are characterized by performing blowing out from the fluid inlet portion 2 side toward the upper end portion of the cylindrical body 21.

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