KR200440023Y1 - Tool for disjointing power operated valve bonnet and tightening torque - Google Patents

Abstract

The present invention facilitates disassembly and tightening of the bonnet screwed to the valve body during the field maintenance without interference of surrounding structures, and enables the bonnet to be tightened with the torque specified in the valve body. And a tool for disassembling and torque-tightening the bonnet of a power drive valve to prevent cracking of a seal weld part of the valve, wherein a lower portion of the bonnet having four yoke rod holes penetrated through the flange part is screwed into the upper center of the valve body. In the power drive valve of the sealing structure the outer circumferential surface of the seal welding portion between the valve body and the bonnet, a circular hole for inserting through the top of the valve stem coupled to the bonnet so as to be seated on the upper surface of the bonnet is formed Insert pin is formed at the position corresponding to the yoke rod hole of the bonnet flange part on the upper surface. Ipyong the support rods for the two sides to the insertion hole is formed between the holes, on both sides of the outer peripheral surface a lower plate which is provided with a striking lug mounted on the upper surface of the bonnet flange and; Four insert pins detachably inserted into the yoke rod holes of the bonnet through the insert pin insertion holes of the lower plate to support the lower plate on the bonnet; An upper plate having a support rod inserting hole formed at a position corresponding to the support rod inserting hole of the lower plate, and having a hexagonal bolt head projected and fixed to an upper surface of the central portion to which any one hand tool selected from a socket and a hammer wrench is coupled; The upper plate and the lower part are inserted into the support rod insertion holes of the lower plate and the upper plate, respectively, so as to be configured to include both support rods supporting the upper plate from the lower plate.

Valve Body, Bonnet, Hammer Wrench, Socket, Torque Multiplier, Torque Wrench

Description

Tool for disjointing power operated valve bonnet and tightening torque

1 is a longitudinal sectional view showing a coupling state of a valve body and a bonnet according to an embodiment of the present invention;

2 is an exploded perspective view showing a configuration according to the present invention,

3 is a perspective view showing a coupled state of FIG.

4 is a plan view of FIG.

5 is a longitudinal cross-sectional view taken along the line A-A of FIG.

6 is a longitudinal cross-sectional view taken along line B-B of FIG. 4;

Fig. 7 is a longitudinal sectional view of the excerpt showing the state for disassembling the bonnet from the valve body using the tool according to the present invention;

Figure 8 is an excerpt longitudinal cross-sectional view showing a state for torque tightening the bonnet to the valve body using a tool according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: valve body 2: bonnet

2a: flange portion 2b: yoke rod hole

3: seal weld part 4: valve stem

10: bottom plate 11: round hole

12: insert pin insertion hole 13, 31: support rod insertion hole

14: striking lug 20: insert pin

30: top 32: hexagon bolt head

40: support rod

The present invention relates to a tool for disassembling and torqueing a bonnet of a power drive valve, and more particularly, to easily disassemble and tighten a bonnet screwed to a valve body without interference from surrounding structures when performing on-site maintenance. For bonnet disassembly and torque tightening of power drive valves, such as motor drive valves and air drive valves, to prevent cracks in the seal weld between the valve body and the bonnet by enabling tightening of the bonnet with the specified torque on the valve body. It is about a tool.

In general, a motor operated valve (MOV) installed in a pipe to secure the stability of a nuclear power plant restores the nuclear power plant to a safe stop state during normal or abnormal operation of the nuclear power plant, particularly in the event of a design standard accident. In order to maintain the safety stop state, it is installed to perform functions such as isolation of the system, formation of flow path, sealing of containment vessel, etc., and AOV (Air Operated Valve) controls the flow and pressure of the fluid. It is being installed to perform the function.

As shown in FIG. 1, four bonnets 2 of a power drive valve, such as a motor drive valve and an air drive valve, which open and close a valve by the operation of such a driver, are provided in the upper center of the valve body 1. The lower part of the bonnet 2, through which the yoke rod hole 2b of the yoke rod hole 2b penetrates the flange portion 2a, is screwed into the valve body 1 through the screwed portion of the valve body 1 and the bonnet 2. The outer circumferential surface of the seal weld part 3 is sealed by welding so that the fluid inside the body 1, ie, boric acid water, does not leak out.

Therefore, in order to disassemble the bonnet 2 from the valve body 1 in the field maintenance, after cutting the seal weld 3 with a cutting grinder (cutting grinder) (not shown), but not shown U-shaped head Two insert pins protrude from both sides of the bottom to correspond with the yoke rod holes 2b penetrated through the flange portion 2a of the bonnet, and have a handle to one side of the head to provide a specially manufactured wrench and a general enclosed rod, and It was disassembled using a hammer and tightened with the specified torque value provided by the power drive valve manufacturer in order to tighten the bonnet 2 by screwing it to the valve body 1. By tightening with a wrench, an enclosed rod, and a hammer, cracks may occur in the seal welding part 3 due to insufficient tightening, which may cause leakage of the power drive valve. , Disassembly and torque tightening is possible only in the lateral direction of the flange part 2a of the bonnet 2 due to the interference of the surrounding structure by the concrete structure, piping, valve support, valves, etc. In addition to the difficulty in the construction of the bonnet (2), the socket coupling is impossible, so that the use of a torque multiplier, a tool for tightening the bonnet (2) with a large torque value in the valve body (1) is impossible to disassemble And the time required for the tightening operation, the yoke rod hole (2b) of the bonnet (2b) due to breakage or carelessness of the enclosed and hammer during on-site maintenance to disassemble and tighten the bonnet (2) from the valve body (1) There was a problem that damage occurs to the flange portion (2a) and surrounding parts, including).

The present invention is devised to solve the above problems, the upper part of the flange portion of the bonnet which is screwed to the valve body of the power drive valve, such as the motor drive valve and air drive valve of the valve body and the bonnet seal welded structure It is installed to be able to work in the concrete structure, pipe disassembly and tightening of the bonnet from the valve body without interference of the surrounding structure by concrete structures, pipes, valve supports, valves, etc., and tighten the bonnet to the valve body with the specified torque The purpose is to close the gap between the upper surface of the valve body and the bonnet to prevent cracking of the seal weld.

In addition, the present invention enables the use of a torque multiplayer, which is a tool that can be applied to a large torque value, and the socket body of the bonnet with the prescribed torque regardless of the type and size of the power drive valve with one socket and a torque wrench. The purpose is to allow the tightening operation.

Referring to the present invention in detail based on the accompanying drawings for achieving the above object is as follows. And it should be noted that detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

1 is a longitudinal cross-sectional view showing a coupling state of the valve body and the bonnet according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a configuration according to the present invention, Figure 3 is a perspective view showing a coupling state of Figure 2 Figure 4 is a plan view of Figure 3, Figure 5 is a longitudinal cross-sectional view of the line AA of Figure 4, Figure 6 is a longitudinal cross-sectional view of the line BB of Figure 4, Figure 7 shows the bonnet from the valve body using a tool according to the present invention Fig. 8 is a longitudinal sectional view showing the main parts of the disassembly, and Fig. 8 is a longitudinal sectional view showing the main parts for tightening the bonnet to the valve body using a tool according to the present invention.

The tool for bonnet disassembly and torque tightening of the power drive valve according to the present invention has a lower portion of the bonnet 2 in which four yoke rod holes 2b penetrate the flange portion 2a in the upper center of the valve body 1. A power drive valve having a screwed structure, in which the outer circumferential surface of the seal weld portion 3 between the valve body 1 and the bonnet 2 is sealed by welding, the bonnet so as to be seated on the upper surface of the bonnet 2. A circular hole 11 is formed for insertion through the upper end of the valve stem 4 coupled to (2), and the yoke rod hole 2b of the flange portion 2a of the bonnet 2 is formed on the upper surface thereof. Insert pin insertion holes 12 are formed at corresponding positions, and both support rod insertion holes 13 are formed between the insert pin insertion holes 12, and striking lugs are formed on both sides of the outer circumferential surface. 14 is provided with a lower plate 10 seated on the upper surface of the flange portion (2a) of the bonnet (2); Four insert pins are detachably inserted into the yoke rod holes 2b of the bonnet 2 through the insert pin insertion holes 12 of the lower plate 10 to support the lower plate 10 on the bonnet 2. insert pin) 20; Hexagonal bolt head having a support rod insertion hole 31 formed at a position corresponding to the support rod insertion hole 13 of the lower plate 10, and any one hand tool selected from a socket and a hammer wrench is coupled to an upper surface of the central portion ( 32 is an upper plate 30 protruding and fixed upward; Both support rods 40 supporting the upper plate 30 from the lower plate 10 by upper and lower portions are detachably inserted into the support rod insertion holes 13 and 31 of the lower plate 10 and the upper plate 30, respectively. Characterized by a configuration comprising a.

In the figure, reference numeral 5 is a valve disc, 6 is a packing, 7 is a packing pressing plate, 8 is a bolt, and 9 is a nut.

When the bonnet 2 is disassembled from the valve body 1 for field maintenance, the present invention configured as described above cuts the welded seal weld 3 with a cutting grinder, and then the top surface of the flange 2a of the bonnet 2. The lower plate 10 is inserted through the upper end of the valve stem 4 and seated thereon, and then four insert pins 20 are inserted into the yoke rods of the bonnet 2 through the insert pin insertion holes 12 of the lower plate 10. Insertion into the hole 2b maintains the lower plate 10 supported laterally from the bonnet 2.

Thereafter, the upper and lower portions of the support rod 40 are inserted into the support rod insertion holes 13 of the lower plate 10 and the support rod insertion holes 31 of both sides of the upper plate 30, respectively, from the lower plate 10 to the upper plate ( 30) is supported in a supported state.

Next, when the hammer wrench 50 is coupled to the hexagonal bolt head 32 of the upper plate 30 and the hammer wrench 50 is hit by using the hammer in the screw loosening direction, the bonnet screwed to the valve body 1 ( 2), the parts including the valve stem 4 coupled to the bonnet 2 are disassembled integrally with the bonnet 2.

Therefore, since the hammering work of the hammer 50 is performed in the upper portion of the flange portion 2a of the bonnet 2, the valve body 1 is easily provided without interference of surrounding structures by concrete structures, piping, valve supports, and various valves. By disassembling the bonnet 2, the damage of the flange portion 2a including the yoke rod hole 2b of the bonnet 2 can be prevented.

At this time, when disassembling the bonnet 2 from the valve body 1 in a place where there is no interference of the surrounding structure by concrete structures, pipes, valve supports, various valves, etc., four insert pins 20 of the lower plate 10 are used. Inserting into the yoke rod hole (2b) of the flange (2a) of the bonnet (2) through the insert pin insertion hole (12) to engage only the bottom plate (10), and the striker lug on the outer circumferential surface of the bottom plate (10) in the screw loosening direction Even when hitting 14 with a hammer, the bonnet 2 is disassembled.

In addition, when screwing the bonnet 2 to the valve body 1 and torque-tightening, after manually screwing the bonnet 2 to the valve body 1, the flange portion of the bonnet 2 as in the above disassembly ( 2a) The lower plate 10 is inserted into the upper surface through the upper end of the valve stem 4 and seated thereon, and then four insert pins 20 are inserted through the insert pin insertion holes 12 of the lower plate 10. When the yoke rod hole 2b is inserted into the yoke rod hole 2b, the lower plate 10 is held in a lateral direction from the bonnet 2.

Then, when the upper and lower portions of the support rod 40 are inserted into the support rod insertion hole 13 of the lower plate 10 and the support rod insertion hole 31 of the upper plate 30, respectively, the upper plate 30 from the lower plate 10 Support is made in the state supported by).

Next, after coupling the hexagon socket 60 corresponding to the hexagonal bolt head 32 of the upper plate 30, the torque wrench 80 is sequentially coupled to the socket 60, and then the bonnet using the torque wrench 80 (2) can be tightened to the exact torque value specified.

 Therefore, the present invention allows the upper face and the bonnet 2 of the valve body 1 to be fully tightened to the valve body 1 with the exact torque defined by the torque wrench 80 with a small force. The gap between them is brought into close contact to prevent cracking of the seal weld 3.

In addition, the present invention, as shown in Figure 8 when screwing the bonnet (2) to the valve body (1) it is difficult to apply a large torque value by human force or when it is difficult to tighten a large torque to tighten the screw with a small force The torque multiplier 70, which is a tool that can be easily loosened or tightened, is coupled to the socket 60 and the torque wrench 80 is coupled to the torque multiplier 70 to apply the torque multiplier 70. .

After disassembling or torque tightening the bonnet 2 to the valve body 1 using the general hammer wrench 50, the socket 60, the torque multiplier 70 and the torque wrench 80 as described above When the tool according to the invention is to be separated, the disassembly and torque tightening operations may be performed in the reverse order. That is, the upper plate 30 is pulled out from the top of both support rods 40 and separated, and then the support rod 40 is pulled out from the lower plate 10 and separated. Then, when the four insert pins 20 are pulled out and separated, the lower plate 10 is separated from the flange portion 2a of the bonnet 2.

Subsequently, the outer peripheral surface of the seal welded portion 3 to which the bonnet 2 is tightened is sealedly welded to the valve body 1 as described above, and then the seal welded portion 3 is subjected to a non-destructive penetration test (PT). This is to check whether the power drive valve is leaking.

In addition, the present invention standardizes the size of the hexagonal bolt head 32 fixed to the upper plate 30 regardless of the power drive valve type and size, so that one hammer wrench 50, the socket 60 and the torque multiplier 70 ) And the torque wrench 80 alone enable disassembly and tightening of the bonnet 2 screwed to the valve body 1.

The contents described in the drawings and the specification are exemplary descriptions of the present invention, which are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the claims.

The present invention configured as described above allows the use of the bonnet from the valve body when performing site maintenance and the work is performed at the upper part of the bonnet, regardless of the interference and direction of the surrounding structure, torque multiplier It can be applied to power drive valves with large torque value, and it is possible to apply tightening torque by using only one socket, torque multiplier and torque wrench, regardless of power drive valve type and size. By tightening the bonnet by torque, it is possible to prevent cracks in the seal welding part, thereby preventing power generation stop due to leakage of the power drive valve, and providing a useful effect to secure maintenance reliability and shorten working time.

Claims (1)

The lower part of the bonnet 2, through which four yoke rod holes 2b penetrate the flange portion 2a, is screwed in the upper center of the valve body 1, and between the valve body 1 and the bonnet 2 In the power drive valve of the structure in which the outer circumferential surface of the seal weld part 3 is sealed by welding, A circular hole 11 for inserting through the upper end of the valve stem 4 coupled to the bonnet 2 to be seated on the upper surface of the bonnet 2 is formed, and the yoke rod of the bonnet flange portion 2a on the upper surface thereof. Insert pin insertion holes 12 are formed at positions corresponding to the holes 2b, and both support rod insertion holes 13 are formed between the insert pin insertion holes 12, and both sides of the outer circumferential surface are formed. A lower plate 10 provided with a striking lug 14 and seated on an upper surface of the flange portion 2a of the bonnet 2; Four insert pins are detachably inserted into the yoke rod holes 2b of the bonnet 2 through the insert pin insertion holes 12 of the lower plate 10 to support the lower plate 10 on the bonnet 2. 20); Hexagonal bolt head having a support rod insertion hole 31 formed at a position corresponding to the support rod insertion hole 13 of the lower plate 10, and any one hand tool selected from a socket and a hammer wrench is coupled to an upper surface of the central portion ( 32 is an upper plate 30 protruding and fixed upward; Both support rods 40 supporting the upper plate 30 from the lower plate 10 by upper and lower portions are detachably inserted into the support rod insertion holes 13 and 31 of the lower plate 10 and the upper plate 30, respectively. Bonnet disassembly and torque tightening tool of the power drive valve, characterized in that the configuration consisting of.

Images