JP4364042B2 - Valve repair jig and repair method thereof - Google Patents

Description

  The present invention relates to a valve repair jig and a repair method thereof, and more particularly to a valve repair jig used for repairing an open / close valve attached to a live line pipe in which internal pressure is applied to the pipe line and the repair thereof. Regarding the method.

  In general, in a gas plant, an oil plant, or the like, a large number of on-off valves for opening and closing the piping are attached to a piping line through which a fluid such as a gas flows. Among the open / close valves attached to such a piping line, parts of the operation unit may be corroded earlier than the valve main body of the open / close valve due to secular change, and may need to be replaced.

  For example, the open / close valve 100 attached to the LNG (Liquified Natural Gas) piping line shown in step (1) of FIG. 7 has a valve body 101 made of stainless steel and an operation part 102 made of iron. (See Patent Document 1). This is because LNG is a cryogenic liquid, and when LNG flows through the on-off valve 100, the valve main body 101 becomes low temperature, but the operation unit 102 is connected to the valve main body 101 via an insulating member such as packing. It is difficult to be affected by low temperatures. For this reason, the valve body 101 is made of a stainless material that is not easily affected by temperature changes, while the operation portion 102 does not need to be made of a stainless material, and is therefore made of inexpensive iron.

  As a result, in the conventional opening / closing valve 100, the parts of the operation unit 102 are corroded earlier than the valve main body 101, and the replacement thereof is necessary. Therefore, a repair jig and a repair method for repairing the valve have been proposed. As shown in FIG. 7, in the repair jig 110 and the repair method, first, in the step (1), the handle 103 is removed from the valve rod 104, and in the step (2), the valve repair jig 110 is covered from above. The valve repair jig 110 is fixed to the open / close valve 100. Then, in the step (3), the first shaft member 113 is inserted into the beam formed on the valve repair jig 110, and the tip portion thereof is brought into contact with the tip portion of the valve shaft 104. Is restricted from moving in the axial direction. Then, in step (4), the yoke 102a, which is a part of the operation unit 102, is disconnected from the valve body 101, and the yoke 102a and the ground retainer 105 are moved upward. Then, in step (5), the beam plate 114 is attached to the frame of the repair jig 110, the fixing plate 115 and the fixing ring 116 are attached to the valve rod 104 through which the beam plate 114 is inserted, and the axial direction of the valve rod 104 is increased. Restrict movement.

  The fixing ring 116 includes a pair of blocks that can be divided into two. These blocks are fitted from both sides of the valve stem 104 and are connected by inserting a taper pin into a pin hole formed in the pair of blocks. Further, when the taper pin is inserted, the fixing ring 116 is installed so that the rotation stop groove formed in the valve rod 104 and the pin hole are in communication with each other, and the taper pin is inserted. For this reason, the fixing ring 116 is fixed to the valve stem 104 in a state where movement in the valve stem axial direction is restricted. Then, in step (6), the first shaft member 113 is pulled upward and extracted from the yoke 102a, the yoke 102a is removed, and a new yoke is replaced. In addition, the gland presser 105 is replaced in the same manner. Then, the repair process for the opening / closing valve is completed by reversing the above-described steps.

JP 2000-263464 A

  In the conventional valve repair jig and the repair method thereof, the fixing ring is fixed to the valve stem in step (5) by inserting a taper pin into a groove formed in the valve stem. For this reason, this conventional valve repair jig and its repair method cannot be used for the type of valve in which the groove is not formed in the valve stem. Therefore, the valve stem of the valve may be grooved at the site where the on-off valve is installed, but the processing operation at the site is extremely troublesome.

  In addition, when a valve that requires repair is removed from the pipe and replaced, a liquid draining operation in the piping line and a complicated incidental operation associated therewith are required, resulting in a problem that much labor and time are required.

  The present invention has been made in view of such a problem, and is a valve repair jig that can be easily repaired for a valve that is attached to a live line pipe and that does not have a groove formed in a valve stem. The purpose is to provide repair methods.

In order to solve such a problem, the present invention is a valve repair jig used for repairing an on-off valve attached to a live line pipe, and includes an operation part of the on-off valve (for example, a yoke in the embodiment). disposed 86) to include the inside, a support body with a fixing portion removably attached to the valve cover of the opening and closing valve, attached to the support body, the first arranged on the valve rod and coaxially of the opening and closing valve A first valve rod movement restricting tool that restricts the movement of the valve rod toward the distal end in the axial direction by abutting one end portion of the shaft member to the tip portion of the valve rod, and movement restricted by the first valve rod movement restricting tool A block member having a locking portion (for example, the female screw portion 53 in the embodiment) that engages with the male screw portion formed on the formed valve stem is locked to the valve stem via the male screw portion, and the block a pair of support portions along the member to the valve stem Characterized by a second valve rod movement restricting mechanism for restricting the movement of the lower portion of the pair of struts to the support body in the axial tip end of the valve stem by connecting to the fixing unit while connected to the upper And

According to this invention, the block member of the second valve stem movement restricting tool is connected to the support main body attached to the on-off valve having the locking portion that engages with the male screw portion formed on the valve stem. Thus, the block member can be connected to the support body in a state of being locked to the valve rod. The support body is attached to the open / close valve, and the first valve rod movement restricting tool is attached to the support body. For this reason, the support body, the first valve stem movement restricting tool, and the second valve stem movement restricting tool are not fixed through a pin in a groove provided in the valve stem. It can be used to repair valves of the type where the rod is not grooved.

  The present invention also provides a severable fixing part in which the support body is detachably attached to the open / close valve, a pair of strut parts that are attached to both sides of the fixing part and extend to the tip end side in the axial direction of the valve stem, and the pair It has a connection part which connects the front-end | tip part of this support | pillar part, It is characterized by the above-mentioned.

  According to this invention, since the fixing portion is configured to be split, the fixing portion can be attached to the opening / closing valve as it is without removing the opening / closing valve attached to the piping line. Moreover, a pair of support | pillar part is attached to the both sides of a fixing | fixed part, and a support body is formed planarly as a rectangular frame body by attaching a connection part to these front-end | tip parts. For this reason, the support body can be reduced in size compared to the three-dimensional shape, and the support body can be attached to the opening / closing valve even if the periphery of the opening / closing valve is a narrow space.

  Further, the present invention is characterized in that the first shaft member of the first valve rod movement restricting tool is provided at the connecting portion so as to be movable in the axial direction of the valve rod.

  According to this invention, the first shaft member is provided in the connecting portion so as to be movable in the valve stem axis direction, thereby facilitating the work of bringing the one end portion of the first shaft member into contact with the tip portion of the valve stem. Can do.

Further, according to the present invention, the block member of the second valve stem movement restricting tool can be divided into two, forming a locking portion that can be engaged with the male screw portion of the valve stem in the combined state, and sandwiching the male screw portion. The block member is fastened to the valve stem and fastened to the valve stem. The block member is attached to both sides of the block member and extends to the base end side of the opening / closing valve. And is attached to the open / close valve via a fixed portion.

According to the present invention, the block member can be divided into two, and when the united state is formed, the locking member that can be engaged with the male screw formed on the valve stem is formed, and is fixed to the valve stem by the fastening means. When the block members are combined so as to sandwich the valve rod and fastened by the fastening means, the locking portion is engaged with the male screw portion, and the block member is fixed to the valve rod. And by connecting this block member to the upper part of a pair of support | pillar part , and connecting the lower part of the said pair of support | pillar part to the fixing | fixed part of the said support main body, the axial direction of a valve stem is provided via a block member and a support | pillar part. Movement can be regulated. As a result, even if the movement restriction of the first shaft member by the first valve stick movement restricting tool is released from the valve stem, the axial movement of the valve stick is restricted by the second valve stick movement restricting tool. Can do.

Furthermore, the present invention is a valve repair method for repairing an open / close valve attached to a live line pipe, wherein a handle attached to the open / close valve is removed, and a support body is provided so as to include an operation part of the open / close valve inside. The support body is attached to the valve lid of the open / close valve, and the first shaft member of the first valve rod movement restricting tool provided on the support body is arranged coaxially with the valve rod of the open / close valve. One end of the shaft member is brought into contact with the tip of the valve stem to restrict the movement of the valve stem toward the tip in the axial direction, and the parts of the operation unit are moved to the tip of the valve stem to be separated from the valve stem, A male threaded portion formed on a valve stem extending from the on-off valve is provided with a block member having a locking portion that can be divided and can be engaged with the male threaded portion on the inside when the united portion is joined. the one as well as connected to the upper struts Of the lower portion of the strut is attached to the second valve rod movement restricting member connected to the fixed portion of the supporting body, by fixing the second valve rod movement restricting member to the support body, the axial tip end of the valve stem The movement is restricted, the first shaft member is removed from the support body, and the parts of the operation unit are removed.

  According to this invention, the axial movement of the valve stem is regulated by the first shaft member of the first valve stem movement restricting tool, the parts of the operating portion are separated from the valve stem, and the valve stem of the valve stem is separated by the second valve stem movement restricting tool. By restricting the movement in the axial direction and removing the first shaft member from the support body, it is possible to remove and replace the parts of the operation unit without moving the valve stem toward the distal end side in the axial direction. As a result, it is possible to replace the parts of the operation unit without removing the open / close valve attached to the pipe from the pipe, so that the valve can be repaired without much labor and time.

  Since the valve repair jig according to the present invention can be used for repairing an open / close valve of a type in which a groove is not formed in the valve stem, this type of valve repair can be easily performed. In addition, according to the valve repair method according to the present invention, it is possible to replace the parts of the operation unit without removing the on-off valve attached to the pipe from the pipe. Therefore, it is possible to save labor and time.

  Hereinafter, preferred embodiments of a valve repair jig and a repair method thereof according to the present invention will be described with reference to FIGS. First, before explaining the valve repair jig and the repair method thereof according to the present invention, an open / close valve to be repaired will be outlined. In the present embodiment, an open / close valve connected to a pipe for flowing a cryogenic liquid such as LNG will be described as an example.

  As shown in FIGS. 6A (cross-sectional view) and (b) (front view), the on-off valve 80 has a valve rod 82 of a valve body 83 incorporated in a valve box 81 attached to a live line pipe H. A lower portion of the valve lid 84 that extends in the vertical direction and is supported via the packing P is detachably fixed to the valve box 81 by bolts and nuts fastening means 85. A yoke 86 is detachably screwed onto the upper portion of the valve lid 84. Inside the yoke 86, a packing pressing member 87 inserted into the valve rod 82 is detachably fixed by a bolt and nut fastening means 88 pivotally supported by the valve lid 84 so as to be swingable up and down. A handle 90 is connected to the upper end of a valve stem 82 that extends by screwing the yoke 86 through a sleeve 89. That is, the handle 90 is coupled to rotate integrally with the valve stem 82. Therefore, when the handle 90 rotates, the valve rod 82 moves up and down with respect to the yoke 86 in accordance with the rotation of the handle 90 and the valve body 83 moves up and down, so that the fluid flow path in the pipe H is changed. Disconnected and put into communication. The packing presser member 87 urges the packing P from above via a packing presser 91 fitted in the valve rod 82.

  Next, the valve repair jig of the present invention will be described. As shown in FIG. 1 (front view) and FIG. 2 (front view), the valve repair jig 1 is disposed so as to surround the yoke 86 and the packing pressing member 87 of the opening / closing valve 80 so that the valve of the opening / closing valve 80 is provided. A support body 10 that is detachably attached to the lid 84, and a lower end portion of the first shaft member 21 that is attached to the support body 10 and is coaxially disposed with the valve rod 82 of the on-off valve 80 is an upper end portion of the valve rod 82. The first valve rod movement restricting tool 20 that contacts and restricts the movement of the valve rod 82 in the axially upper direction, and the valve rod 82 whose movement is restricted by the first valve rod movement restricting tool 20 toward the tip end in the axial direction. It has the 2nd valve-rod movement control tool 50 which controls a movement.

  The support body 10 includes a detachable fixing portion 11 that is detachably attached to an upper portion of a valve lid 84 of the opening / closing valve 80, a pair of support column portions 13 that are attached to both sides of the fixing portion 11 and extend upward, It has a connecting portion 14 for connecting the tip end portion of the column portion 13.

  The fixing | fixed part 11 has a pair of fixing blocks 12 and 12 of a substantially rectangular parallelepiped shape, as shown in FIG. 3 (sectional drawing). A concave portion 12a is formed at the center of the fixed block 12 so that the upper portion of the valve lid 84 can be clamped in a state where the pair of fixed blocks 12 are joined together, and screw holes 12b penetrating vertically at both ends of the fixed block 12. A recess 12c is formed at both ends of the recess 12a. The recess 12c forms a screw hole extending in the vertical direction in a state where the pair of fixed blocks 12 are combined. The pair of fixed blocks 12 are formed with connecting holes 12d communicating in the horizontal direction in a state where they are combined. The screw holes 12b formed at both ends of the fixed block 12 are for attaching the support column 13 shown in FIG. 1, and the recess 12c is provided with the second valve stem movement restricting tool 50 shown in FIG. The connecting hole 12d is for mounting fastening means 15 comprising bolts and nuts for fixing the pair of fixing blocks 12 in a combined state.

  As shown in FIG. 1, the support column 13 is a rod-like member, and the lower end thereof is screwed into a screw hole formed in the end of the fixed block 12 and fixed to the fixed block 12. A male screw portion 13a is formed at the upper end portion of the column portion 13, and a through-hole formed in the end portion of the connecting portion 14 so that the lower surface of the connecting portion 14 abuts on an upper portion of a nut 13b screwed to the male screw portion 13a. The upper end of the column 13 is inserted into the upper end of the column 13 protruding from the connecting portion 14, and the nut 13 c is screwed into the upper end of the column 13.

  The connecting portion 14 has a plate shape, and a sleeve 16 that holds the first shaft member 21 extending in the up and down direction so as to be vertically movable is attached to the center portion. A through-hole (not shown) that passes through the upper end is formed. Thus, the support body 10 has a planar shape because the fixed portion 11 and the connecting portion 14 are connected via the pair of support columns 13, and has a rectangular shape in a side view. For this reason, the support main body 10 is thin, and is small compared with what the support main body 10 is formed in three dimensions.

  The first valve rod movement restricting tool 20 includes a first shaft member 21 that is screwed into the sleeve 16 and a handle 22 that is detachably attached to the upper end portion of the first shaft member 21 and rotates the first shaft member 21. Have. The first shaft member 21 includes a small-diameter portion 21a having a small diameter on the tip side and a large-diameter large-diameter portion 21b that extends upward and is connected to the upper end portion of the small-diameter portion 21a. The lower side of the large diameter portion 21b is screwed into the sleeve 16, and the rotation of the handle 22 moves the large diameter portion 21b in the vertical direction, so that the first shaft member 21 moves up and down. An engagement portion 21c having an engagement recess that opens downward and engages with the upper end portion of the valve stem 82 is attached to the lower end portion of the small diameter portion 21a. For this reason, the coupling | bonding of the 1st shaft member 21 and the valve stem 82 can be ensured by the engaging part 21c. Note that the lower end portion of the small diameter portion 21 a may be formed into a needle shape so as to abut the tip portion of the valve rod 82.

  As shown in FIG. 2, the second valve stem movement restricting tool 50 includes a plate member 51 disposed between the pair of support columns 13. The plate member 51 includes a pair of fixed blocks 52 that can be divided into two. When these fixed blocks 52 are in a combined state, a female screw portion 53 that can be screwed into a male screw portion 82 a formed at the tip of a valve rod 82 extending from the opening / closing valve 80 is formed at the center of the pair of fixed blocks 52. . More specifically, a screw block 54 in which a cylindrical body having a female screw portion 53 formed inside is halved is fitted to the center portion of the fixed block 52. Therefore, when the pair of fixed blocks 52 are combined, the pair of screw blocks 54 are combined to form a cylindrical body, and the female screw portion 53 is formed inside the cylindrical body. The pair of fixing blocks 52 are fixed by fastening means 55 composed of bolts and nuts that pass through them. The pair of combined fixed blocks 52 are connected to the fixed block 12 of the fixed portion 11 via the pair of support columns 56. The pair of column portions 56 are fixed to the fixing portion 11 by nuts 57.

  Next, the yoke 86 of the on-off valve 80, the packing pressing member 87, and the packing pressing member 91 (hereinafter referred to as “operation part components 86, 87,”) attached to the live line pipe using the valve repair jig 1 described above. 91 ”) will be described. First, as shown in FIG. 4A, the handle 90 that is screwed into the upper end portion of the valve rod 82 of the on-off valve 80 is removed. Then, as shown in FIG. 4B, the sleeve 89 fitted to the upper portion of the yoke 86 is removed. Then, as shown in FIG. 4C, the support body 10 is disposed so as to include the yoke 86 of the opening / closing valve 80 inside, and the pair of fixed blocks 12 of the fixing portion 11 are attached to the upper portion of the valve lid 84. The position of the first shaft member 21 is adjusted so that the first shaft member 21 of the first valve rod movement restricting tool 20 is coaxial with the valve rod 82 of the opening / closing valve 80, and the lower end portion of the first shaft member 21 is adjusted. The front end of the valve stem 82 is engaged and brought into contact with the engaging portion 21c shown in FIG.

  Then, as shown in FIG. 5 (d), the fixing support of the packing pressing member 87 is released, and the packing pressing member 87, the yoke 86 and the packing pressing member 91 are moved upward along the valve rod 82 to move from the valve rod 82. Pull apart. Then, as shown in FIG. 5 (e), the plate member 51 of the second valve rod movement restricting tool 50 is attached to the male screw portion 82 a formed at the tip of the valve rod 82 extending from the opening / closing valve 80. That is, the pair of fixed blocks 52 constituting the plate member 51 are united so as to sandwich the male screw portion 82a. As a result, the internal thread portion 53 shown in FIG. 2 formed when combined is engaged with the external thread portion 82a, and the plate member 51 is locked to the valve stem 82 via the external thread portion 82a. Then, the plate member 51 is fastened by the fastening means 55 of the plate member 51, and the plate member 51 is fixed to the valve rod 82. Then, the second valve rod movement restricting tool 50 is fixed to the fixing portion 11 of the support body 10 attached to the opening / closing valve 80 via the pair of support columns 56. As a result, the movement of the valve stem 82 toward the upper end in the axial direction can be regulated by the second valve stem movement restricting tool 50.

  And the 1st moving shaft 21 of the 1st valve-rod movement control tool 20 is pulled out from the connection part 14, and the components 86, 87, and 91 of an operation part are removed as shown in FIG.5 (f). Then, the valve repair method described above is executed in reverse, and the parts of the new operation unit are attached to the opening / closing valve 80, and the parts replacement operation is completed.

  Thus, in the valve repair jig 1 and the valve repair method of the present invention, the second valve rod movement restricting tool 50 is attached to the valve stem 82 using the male screw portion 82a formed on the valve stem 82. It can be used for repairing the opening / closing valve 80 having no groove. Therefore, the open / close valve 80 having no groove on the valve rod 82 attached to the live line pipe can be repaired by the valve repair jig and the valve repair method of the present invention. The open / close valve 80 attached to the pipe is removed from the pipe. The parts of the operation unit can be replaced without removing them, and the valve can be repaired without much labor and time.

  As a means for locking the second valve stem movement restricting tool 50 to the valve stem 82, the internal thread portion 53 that can be screwed into the external thread portion 82a formed on the valve stem 82 is taken as an example. The protrusion part which can be matched may be sufficient. Further, the valve repair jig 1 and the valve repair method of the present invention may be applied to an open / close valve connected to a conduit such as gas or water and piping in various plants.

The front view of the valve repair jig concerning one embodiment of the present invention is shown. The front view of the valve repair jig concerning one embodiment of the present invention is shown. Sectional drawing of the fixing | fixed part equivalent to the II arrow of FIG. 1 in this valve repair jig | tool is shown. The side view of the valve repair jig | tool and on-off valve for demonstrating the valve repair method of this invention is shown. The side view of the valve repair jig | tool and on-off valve for demonstrating the valve repair method of this invention is shown. The on-off valve to be repaired is shown, in which FIG. (A) is a cross-sectional view of the on-off valve corresponding to the VI-VI arrow in FIG. (B), and (a) is a side view of the on-off valve. . The side view of the valve repair jig etc. for demonstrating the valve repair method of the conventional opening-and-closing valve is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve repair jig 10 Support main body 11 Fixing part 13, 56 Support | pillar part 14 Connection part 20 1st valve-rod movement restriction tool 21 1st shaft member 50 2nd valve-rod movement restriction tool 51 Plate member 53 Female thread part (locking part) )
55 Fastening means 80 Opening and closing valve 82 Valve rod 82a Male thread part 86 Yoke (operation part, parts of the operation part)
87 Packing presser member (operation part parts)
90 Handle 91 Packing presser (operating part)
H Piping

Claims (5)

A valve repair jig used to repair an open / close valve attached to a live line pipe,
Are arranged so as to include an operation unit of the on-off valve on the inside, a support body with a fixing portion removably attached to the valve cover of the on-off valve,
One end of a first shaft member attached to the support body and coaxially disposed with the valve stem of the on-off valve is brought into contact with the tip of the valve stem to move the valve stem toward the tip in the axial direction. A first valve stem movement restrictor that regulates;
A block member having a locking portion that engages with a male screw portion formed on the valve rod whose movement is restricted by the first valve rod movement restricting tool is locked to the valve rod via the male screw portion. The block member is connected to the upper part of the pair of support parts along the valve stem, and the lower part of the pair of support parts is connected to the fixed part of the support body, thereby moving the valve shaft toward the distal end in the axial direction. And a second valve rod movement restricting tool for restricting movement of the valve repair jig.   The support body includes a detachable fixing portion that is detachably attached to the open / close valve, a pair of support portions that are attached to both sides of the fixing portion and extend toward the front end side in the axial direction of the valve stem, and the pair of support posts. The valve repair jig according to claim 1, further comprising: a connecting portion that connects a tip portion of the portion.   3. The valve repair jig according to claim 2, wherein the first shaft member of the first valve rod movement restricting tool is provided in the connecting portion so as to be movable in an axial direction of the valve rod. The block member of the second valve stem movement restricting tool can be divided into two parts, forming the locking portion that can be engaged with the male screw portion of the valve stem in the combined state, and sandwiching the male screw portion. Fastening means for fastening the combined block member and fixing it to the valve stem;
The block member is attached to both sides of the block member, and the distal end portions of the pair of support columns extending to the base end side of the valve lid are attached to the fixing portion, and are attached to the valve lid via the fixing portion. The valve repair jig according to claim 2. A valve repair method for repairing an on-off valve attached to a live line pipe,
Remove the handle attached to the opening and closing valve,
The support body is arranged so as to include the operation part of the opening / closing valve inside, and the fixing part of the support body is attached to the valve lid of the opening / closing valve,
The first shaft member of the first valve rod movement restricting tool provided on the support body is arranged coaxially with the valve rod of the on-off valve, and one end of the first shaft member is brought into contact with the tip of the valve rod. Restricting the movement of the valve stem to the axial front end side,
Move the parts of the operating part to the tip side of the valve stem and pull away from the valve stem,
The male threaded portion formed on the valve stem extending from the open / close valve is provided with a block member having a locking portion that can be divided and can be engaged with the male threaded portion on the inside when the united portion is joined. The second valve rod movement restricting tool is connected to the upper part of the pair of supporting column parts along the lower side and the lower part of the pair of column parts is connected to the fixing part of the support body, and the second valve rod movement restricting tool is attached to the Fixed to the support body, restricting the movement of the valve stem to the tip side in the axial direction,
A valve repairing method comprising removing the first shaft member from the support body and removing a part of the operation portion.

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