JP5451511B2 - Replacement jig for packing retainer fixing part - Google Patents

Description

The present invention provides a valve body that controls the flow rate of a fluid that flows through the inside of a fluid pipe, a valve rod that has one end connected to the valve body and extends in a diameter direction of the fluid pipe, the valve body, and the valve. A housing that accommodates a part of the rod, the housing having a valve rod through-hole through which the valve rod penetrates, and protruding in the valve rod radial direction on the outer peripheral portion of the outer end of the valve rod through-hole. And a gasket that seals between the valve stem through hole and the valve stem, and the packing from the outside of the housing to the inside of the housing in the valve stem axial direction. Packing presser foot, and a packing presser fixing portion that is fixed in position in the valve stem axis direction by the housing and regulates the movement of the packing presser from the housing inner side to the housing outer side in the valve stem shaft direction The present invention relates to an exchange jig for a packing presser fixing portion used in a valve mechanism including
In particular, the packing fixture fixing part replacement jig of the present invention is also suitably applied when a fluid is circulating in a fluid pipe.

In general, the valve mechanism 100 described above is provided in a fluid pipe 2 that guides a low-temperature fluid such as LNG from the LNG tank to the outside, as shown in FIG. As shown in FIGS. 3 and 4, the valve mechanism 100 includes a valve body 6 that controls the flow rate of the low-temperature fluid that circulates inside the fluid pipe 2, and a pipe diameter of the fluid pipe 2 that has one end connected to the valve body 6. 3 is provided with a valve rod 7 extending in a direction (a direction along arrow Y in FIG. 3) and a housing 8 that accommodates part of the valve body 6 and the valve rod 7, and the valve rod 7 penetrates the housing 8. A valve rod through-hole 9 is provided, and is provided in the casing 8 in a form protruding in the valve rod radial direction (direction along the arrow X in FIGS. The flange 10 (shown in FIG. 4), the packing 11 that seals between the valve stem through hole 9 and the valve stem 7, and the packing 11 in the valve stem axial direction (the direction along arrow Y in FIGS. 3 and 4). ) And the packing retainer 12 that is pressed from the outside of the housing to the inside of the housing (in the direction of arrow α in FIGS. 3 and 4), and the housing 8 is positioned in the valve stem axis direction (the direction along the arrow Y in FIGS. 3 and 4). The movement of the packing presser 12 from the inside of the housing to the outside of the housing (the direction opposite to the arrow α in FIGS. 3 and 4) is restricted in the valve stem axis direction (the direction along arrow Y in FIGS. 3 and 4). And a packing presser fixing portion 13 to be provided.
In such a valve mechanism 100, a part of the valve body 6 and the valve stem 7 is provided inside the housing 8 and is directly exposed to a low-temperature fluid. Therefore, stainless steel which is not easily deteriorated even in a low-temperature environment. The product made from is used. On the other hand, the packing retainer fixing portion 13 is provided outside the housing 8 and is not directly exposed to the low-temperature fluid, so that a relatively inexpensive iron is often used. The iron packing retainer fixing portion 13 is appropriately replaced after it has been used for a long period of time because rust or the like is formed on the surface, and the sliding or rotation of the valve stem 7 may be hindered by the rust or the like.
The replacement of the packing retainer fixing portion 13 may have to be performed when the fluid pipe 2 is in a live pipe state due to a failure of a shutoff valve provided on the upstream side thereof. In such a case, the packing 11 and the packing retainer 12 do not come out from the inside of the housing to the outside of the housing (the side opposite to the arrow α in FIGS. 3 and 4) due to the fluid pressure of the fluid inside the housing 8. Must be replaced in a fixed state.

Therefore, in order to prevent the packing presser 12 from slipping from the inside of the housing to the outside of the housing (the side opposite to the arrow α in FIGS. 3 and 4) when the fluid pipe 2 is in the live tube state, A packing retainer holding portion for sandwiching the packing retainer 12 from the outer diameter side in the valve stem radial direction (arrows X1 and X2 in FIGS. 3 and 4), and the housing 8 in the valve stem radial direction (arrows X1 and X1 in FIGS. 3 and 4). A housing clamping portion that clamps from the outer diameter side in the X2 direction) and a coupling portion that can be fixedly connected to the housing clamping portion in the valve stem axial direction (the arrow Y direction in FIGS. 3 and 4). An exchange jig for a packing presser fixing portion is known (see Patent Document 1).
In the technique disclosed in Patent Document 1, the packing presser 12 is sandwiched between the packing presser holding part that holds the packing presser 12 and is fixed to the casing holding part that is held and fixed to the casing via the connecting part. Due to the fluid pressure inside the housing 8, it escapes from the inside of the housing to the outside of the housing (opposite to the arrow α in FIGS. 3 and 4) in the valve stem axis direction (the direction along the arrow Y in FIGS. 3 and 4). To prevent that.

Japanese Patent Laying-Open No. 2005-288656

  In the technique disclosed in Patent Document 1 described above, the packing presser 12 is substantially between the housing clamping portion and the housing 8 in the valve stem axis direction (the direction along the arrow Y in FIGS. 3 and 4). It is fixed only by the frictional force generated in For this reason, with respect to the packing presser 12, from the inside of the housing to the outside of the housing (the opposite side of the arrow α in FIGS. 3 and 4) in the valve stem axis direction (the direction along arrow Y in FIGS. 3 and 4) When a large fluid pressure is applied by the fluid inside the body 8, the packing presser 12 may come off from the inside of the housing to the outside of the housing (the opposite side of the arrow α in FIGS. 3 and 4).

  The purpose of this application is to solve the above-mentioned problems. The purpose of the present application is to prevent the packing and the packing presser from coming off even when the fluid pipe is in a live pipe state when replacing the packing press fixing part. The present invention is to provide an exchange jig for a packing press fixing portion that prevents a fluid such as LNG from leaking from the inside of the housing to the outside.

In order to achieve the above-mentioned object, the replacement jig for packing press fixing part of the present invention is:
A valve body for controlling a flow rate of a fluid flowing through a fluid pipe; a valve rod having one end connected to the valve body and extending in a pipe diameter direction of the fluid pipe; and the valve body and a part of the valve stem And a valve rod through hole through which the valve rod penetrates the housing,
A seal that seals between the flange provided in the housing in a form protruding in the valve rod radial direction on the outer peripheral portion of the outer end of the valve rod through hole, and the valve rod through hole and the valve rod And a packing presser for pressing the packing from the outside of the housing to the inside of the housing in the direction of the valve stem axis, the position of the packing presser being fixed in the valve stem axis direction by the housing, and the packing presser in the direction of the valve stem axis A packing presser fixing part replacement jig used in a valve mechanism including a packing presser fixing part that regulates movement from the inner side of the casing to the outer side of the casing,
Its feature configuration is
A packing press clamping portion capable of clamping the packing press from the outer diameter side of the valve stem radial direction;
A housing clamping portion capable of clamping the housing from the outer diameter side in the valve stem radial direction;
A connecting portion capable of fixedly connecting the packing clamp holding portion to the casing holding portion in the valve stem axis direction;
One end is fixed to the housing holding portion, and the other end is in contact with the flange portion to move the housing holding portion from the inside of the housing to the outside of the housing in the valve stem axis direction. It is in the point provided with the movement control part which controls.

According to the above characteristic configuration, the packing presser is clamped by the packing presser clamping portion from the outer diameter side in the valve stem radial direction. The packing press sandwiching portion is fixedly connected by a connecting portion in the valve stem axis direction to the housing sandwiching portion that sandwiches the housing and is fixed to the housing. Further, the housing holding portion is moved from the inside of the housing to the outside of the housing in the valve stem axis direction by a movement restricting portion whose one end is fixed to the housing holding portion and the other end is in contact with the flange portion. Is regulated.
As a result, the packing presser has a friction force in the direction of the valve stem shaft generated between the housing holding portion and the housing as the housing is held by the housing holding portion, and a tension accompanying the contact of the movement restricting portion with the collar portion. The position is fixed in the axial direction of the valve stem by both forces.
As a result, even if the fluid pipe is in the live pipe state and the fluid pressure applied from the inside of the housing to the outside of the housing in the valve stem axial direction is large with respect to the packing presser, the packing presser is properly used in the valve stem axial direction. Can be fixed in position.
From the above, when replacing the packing retainer fixing part, even when the fluid pipe is in the live tube state, the packing and the retainer are prevented from coming off, and fluid such as LNG leaks from the inside of the housing to the outside. Therefore, it is possible to realize an exchange jig for the packing presser fixing portion which prevents the above.

A further characteristic configuration of the replacement jig for the packing presser fixing portion of the present invention is as follows:
The movement restricting portion is characterized in that it has an adjustment mechanism capable of adjusting the length from the end portion on the housing clamping portion side to the end portion on the flange portion side.

  According to the above characteristic configuration, while the housing is appropriately clamped by the housing clamping portion and properly positioned in the valve stem axis direction, the end of the movement restricting portion from the end of the housing clamping portion to the end of the buttocks It is possible to adjust the length to the portion so that the end portion on the flange side is surely in contact with the flange portion, and it is possible to reliably prevent the movement of the housing clamping portion in the valve stem axis direction.

A further characteristic configuration of the replacement jig for the packing presser fixing portion of the present invention is as follows:
The adjusting mechanism includes a rod-shaped male screw portion fixed to the housing holding portion and a cylindrical female screw portion having an inner peripheral surface that is screwed to the rod-shaped male screw portion.

  According to the above characteristic configuration, the adjusting mechanism rotates the female screw portion in a state where the cylindrical female screw portion having an inner peripheral surface screwed to the rod-shaped male screw portion is screwed, thereby causing the female screw portion to rotate. It is possible to move the position of the end portion on the heel portion side to a position where it contacts the heel portion. Thereby, the state which adjusted the length of the movement control part and contact | abutted the end to the collar part by comparatively easy operation is realizable.

A further characteristic configuration of the replacement jig for the packing presser fixing portion of the present invention is as follows:
The packing retainer sandwiching portion and the housing sandwiching portion are each provided with a pair of longitudinal members,
The direction in which the packing retainer sandwiching portion sandwiches the packing retainer is the short axis direction of the pair of long members constituting the packing retainer sandwiching portion as viewed in the valve stem axial direction, and the housing sandwiching portion is the housing. The direction in which the body is clamped is the minor axis direction of the pair of long members constituting the packing press clamp portion as viewed in the valve stem axis direction,
The direction in which the packing retainer sandwiching part grips the packing retainer and the direction in which the casing sandwiching part sandwiches the casing are perpendicular to each other when viewed from the valve stem axis direction.

Usually, in the valve mechanism, a pair of yokes is provided in a state where the packing presser clamping portion is provided in the valve shaft axis direction so as to face each other with the packing presser interposed therebetween. Further, a plate-like portion is provided along the opposing direction of the pair of yokes at a portion where the housing clamping portion is provided in the valve stem axis direction.
According to the above-described characteristic configuration, the packing clamp holding portion is positioned in the valve stem axial direction while the direction in which the packing presser is clamped is along the opposing direction of the pair of yokes in the valve stem axial view. The direction in which the housing is sandwiched can be arranged so as to be orthogonal to the plane of the plate-like part.
Thus, while arranging the pair of longitudinal members of the packing retainer holding portion in a state where the short axis direction thereof is along the opposing direction of the pair of yokes, the pair of longitudinal members of the housing sandwiching portion is replaced with the plate-like portion. It can arrange | position in the state inserted | pinched. As a result, the packing retainer sandwiching portion and the housing sandwiching portion can be appropriately arranged without interfering with the yoke and the plate-like portion.

A further characteristic configuration of the replacement jig for the packing presser fixing portion of the present invention is as follows:
The packing presser clamping portion is provided with a through hole in which a female screw is screwed in the valve stem axis direction, and a male screw that can be screwed into the through hole,
The male screw is screwed into the through hole from the housing side toward the packing presser fixing part side in the valve stem axis direction, and protrudes from the packing presser fixing part side of the through hole. The presser fixing portion is configured to be pressable.

The packing presser fixing portion is made of iron or the like as described in the above-described problem. Thereby, rust etc. may generate | occur | produce in a packing press fixing | fixed part by long-term use. As a result, the packing retainer fixing portion may be fixed to the bolt for fixing it or the packing retainer due to the rust or the like.
According to the above-described characteristic configuration, the male screw is screwed into the through hole in which the female screw is screwed in the direction of the valve stem in the direction of the valve stem from the housing side toward the packing presser fixing portion in the direction of the axis of the valve stem. By doing so, the male screw part can be protruded toward the packing presser fixing part side of the through hole, and the packing presser fixing part can be pressed. Thereby, even when the packing presser fixing part is fixed with bolts or the like due to rust, the packing presser fixing part can be pressed by the male screw and moved from the housing side toward the packing presser fixing part side. And can be removed relatively easily.

It is a figure which shows the position with respect to the LNG tank of the valve mechanism to which this invention is applied. It is a perspective view of the exchange jig for packing press fixation parts of the present invention. It is a schematic block diagram of the valve mechanism to which this invention is applied. It is a side view of a valve mechanism to which the present invention is applied. It is the attachment side view of the housing | casing clamping part of this invention. It is the side view which made the contact part of this invention contact the collar part of a housing | casing. It is the side view which attached the packing clamp clamping part and connection part of this invention. It is the side view which attached the packing clamp clamping part and connection part of this invention. It is sectional drawing in the IX-IX plane shown by FIG. It is a sectional side view when replacing a packing presser fixing part by the present invention. It is a sectional side view when replacing a packing presser fixing part by the present invention.

Prior to the description of the present invention, a valve mechanism 100 to which the packing press fixing portion replacement jig of the present invention is applied will be described with reference to FIGS.
As shown in FIG. 1, the valve mechanism 100 is provided in a fluid pipe 2 that guides a low-temperature fluid to the outside from an LNG tank 1 that stores a low-temperature fluid such as LNG. On the upstream side and the downstream side of the valve mechanism 100, cutoff valves 4 and 5 that block the flow of fluid in the fluid pipe 2 are provided.

As shown in FIGS. 3 and 4, the valve mechanism 100 includes a valve body 6 that controls the flow rate of the fluid flowing through the fluid pipe 2, and one end connected to the valve body 6, and the pipe diameter direction of the fluid pipe 2. A valve having a valve stem 7 extending in the direction of arrow Y in FIG. 3 and a casing 8 that accommodates part of the valve body 6 and the valve stem 7, and the valve 8 passes through the casing 8. It has a rod through hole 9,
A flange 10 (see FIG. 3) provided on the casing 8 in a form protruding in the valve rod radial direction (the direction along arrows X1 and X2 in FIGS. 3 and 4) on the outer peripheral portion 50 of the outer end of the valve rod through hole 9. 4), a packing 11 that seals between the valve stem through hole 9 and the valve stem 7, and the packing 11 in the valve stem axial direction (direction along arrow Y in FIGS. 3 and 4). The packing retainer 12 that is pressed from the inside to the inside of the casing (in the direction of the arrow α in FIGS. 3 and 4) and the casing 8 is fixed in position in the valve stem axis direction (the direction along the arrow Y in FIGS. 3 and 4). Packing retainer fixing portion 13 that restricts movement from the inside of the housing to the outside of the housing (the direction opposite to arrow α in FIGS. 3 and 4) in the direction of the valve stem axis (the direction along arrow Y in FIGS. 3 and 4). And.
As shown in FIG. 3, the packing retainer fixing portion 13 is fixed to the housing 8 by a mechanism for positioning the packing retainer fixing portion 13 with respect to the housing 8 (hereinafter abbreviated as a positioning mechanism). As shown in FIG. 3, the positioning mechanism includes a bolt 19 having a male screw threaded at one end and an opening 21 provided at the other end, and a nut 18 that can be screwed to the bolt 19. It consists of and.
In the positioning mechanism, one end of the bolt 19 is inserted into the through hole 22 of the packing retainer fixing portion 13 and screwed into the nut 18, and the opening 21 at the other end of the bolt 19 is inserted into the outside of the valve rod through hole 9. The rod-like member 20 penetrating through a pair of semi-annular portions 17a and 17b provided on the outer peripheral portion 50 at the end is inserted to position the packing retainer fixing portion 13.

As shown in FIG. 4, the casing 8 sandwiches the valve stem 7 on the non-valve element side (the opposite side to the arrow α in FIG. 4) in the valve stem axial direction (the direction along the arrow Y in FIG. 4). A pair of yokes 14a and 14b are fixed at opposing positions. Further, the outer peripheral portion 50 of the outer end of the valve stem through-hole 9 of the housing 8 is along the opposing direction of the pair of yokes 14a and 14b as viewed in the valve stem axial direction (viewed along the arrow Y in FIG. 4). A plate-like portion 15 extends in the direction (the direction along the arrow X2 in FIG. 4).
Further, the valve mechanism 100 is controlled from the outside on the non-valve element side (the direction opposite to the arrow α in FIGS. 3 and 4) in the direction of the valve stem axis of the yokes 14a and 14b (the direction along the arrow Y in FIGS. 3 and 4). An actuator 60 that operates according to a signal is provided. By actuating the actuator 60, the valve rod 7 is moved together with the valve body 6 in the axial direction of the valve stem (the direction along the arrow Y in FIGS. 3 and 4), and the valve body 6 is closed with the fluid pipe 2 closed. The flow rate of the fluid flowing through the fluid pipe 2 is controlled by changing the open state of the fluid pipe 2 between the state (the state shown in FIG. 3) and the open state (not shown) in which the fluid pipe 2 is opened. be able to. A handle 6 that can be manually rotated is provided on the side of the actuator 60. In the handle 6, when the actuator 60 fails, the valve body 6 and the valve stem 7 can be moved in the valve stem axis direction (the direction along the arrow Y in FIGS. 3 and 4) by rotating the handle 60. it can.

Next, an exchange jig for the packing presser fixing portion of the present invention applied to the valve mechanism 100 described so far will be described with reference to FIGS.
As shown in FIGS. 2, 7, and 8, the packing jig fixing part replacement jig of the present invention can hold the packing holder 12 from the outer diameter side in the valve stem radial direction (the direction along arrow X <b> 2 in FIG. 2). Packing presser clamping part 23, casing clamping part 24 capable of clamping the casing 8 from the outer diameter side in the valve stem radial direction (the direction along arrow X1 in FIG. 2), and packing presser clamping part 23 as the casing clamping part 24, a connecting portion 25 that can be fixedly connected in the direction of the valve stem axis (the direction along arrow Y in FIG. 2), and one end fixed to the housing sandwiching portion 24, and the other end abutting against the flange portion 10 And a movement restricting portion 26 for restricting movement of the body clamping portion 24 from the inside of the housing to the outside of the housing (arrow β side in FIG. 2) in the valve stem axis direction (the direction along arrow Y in FIG. 2). ing.

[Case clamping part]
As shown in FIG. 2, the housing clamping unit 24 includes a pair of longitudinal members 32a and 32b and four first bolt / nut mechanisms 51 (two in FIG. 2) that fasten the pair of longitudinal members 32a and 32b. Only shown). First semicircular arc-shaped concave portions 33a and 33b having a shape along the outer peripheral portion 50 of the outer end of the valve stem through hole 9 are provided at portions of the pair of longitudinal members 32a and 32b facing each other. And the 1st rubber sheet 34a, 34b for suppressing the slip between the outer peripheral parts 50 of the outer side end of the valve-rod through-hole 9 is provided in the opposing surface to the said 1st semicircular arc shaped recessed part 33a, 33b. Is provided. And the housing | casing clamping part 24 has arrange | positioned the said 1st semi-arc-shaped recessed part 33a, 33b along the outer peripheral part 50 of the outer end of the valve-rod through-hole 9 of the housing | casing 8, as shown in FIG. In this state, the pair of longitudinal members 32 a and 32 b are fastened by the four first bolt and nut mechanisms 51, so that they are clamped and fixed to the housing 8. Thereby, the housing clamping unit 24 is viewed in the short axis direction (direction along the arrow X1 in FIG. 2) of the pair of long members 32a and 32b as viewed in the valve shaft axis direction (direction view along the arrow Y in FIG. 2). Thus, the valve rod through hole 9 of the housing 8 is clamped.
As shown in FIG. 2, each of the pair of longitudinal members 32a and 32b has a direction perpendicular to the longitudinal direction (indicated by the arrow in FIG. 5) as viewed in the valve stem axis direction (in the direction along arrow Y in FIG. 2). Flat portions 35a and 35b extending in the direction along X1) are provided. The flat portions 35a and 35b are provided with a pair of openings 36 that are fastened by a connecting portion 25 described later with respect to the flat portions 35a and 35b.

[Movement Control Department]
As shown in FIGS. 2 and 6, a pair of movement restricting portions 26 are provided for each of the pair of flat surface portions 35 a and 35 b of the housing holding portion 24. The movement restricting portion 26 includes a rod-shaped male screw portion 37 that is fixed to the housing holding portion 24 and a cylindrical female screw portion 38 that has an inner peripheral surface that is screwed into the rod-shaped male screw portion 37. . The rod-shaped male screw portion 37 and the cylindrical female screw portion 38 are rotated on the cylindrical female screw portion 37 with respect to the rod-shaped male screw portion 37 as shown in FIG. It functions as an adjustment mechanism that can adjust the length from the end 39 to the end 40 on the flange side. Thereby, as shown in FIG. 6, the movement restricting portion 26 extends and contacts the end portion 40 on the heel portion to the heel portion 10 in a state where the case holding portion 24 is nipped and fixed to the case 8. Can do. As a result, it is possible to realize a state in which all the movement restricting portions 26 are appropriately brought into contact with the flange portion 10. And it can restrict | limit appropriately that the housing | casing clamping part 24 moves from a housing | casing inner side to the housing | casing outer side (arrow (beta) side in FIG. 6) in the valve-shaft axial direction (direction along arrow Y in FIG. 6). .

[Packing presser clamping part]
As shown in FIG. 2, the packing retainer holding portion 23 includes a pair of longitudinal members 27a and 27b and four second bolt / nut mechanisms 29 (two in FIG. 2) for fastening the pair of longitudinal members 27a and 27b to each other. Only shown). Further, second semicircular arc-shaped recesses 30a and 30b are provided at portions of the pair of longitudinal members 27a and 27b that face each other, and a second semi-circular recess 30a and 30b is provided for suppressing slippage with the packing presser 12. Two rubber sheets 31a and 31b are provided. As shown in FIGS. 7 and 8, the packing retainer sandwiching portion 23 includes four second bolts and the second semi-circular recesses 30 a and 30 b arranged along the outer periphery of the packing retainer 12. The packing presser 12 is clamped by fastening the pair of longitudinal members 27 a and 27 b with the nut mechanism 29.
As shown in FIG. 2, each of the pair of longitudinal members 27a and 27b has a longitudinal direction (in the direction along arrow Y in FIG. 2) as viewed in the valve stem axis direction (perpendicular to the arrow X2 in FIG. 2). Plane portions 41a and 41b along the direction). The flat portions 41a and 41b are provided with a pair of openings 42 for fastening the connecting portions 25 described later with respect to the flat portions 41a and 41b.
Further, the flat portions 41a and 41b are provided with a pair of through holes 44 each having a female screw threaded in the valve stem axis direction (the direction along arrow Y in FIG. 2). The male screw 43 is configured to be screwed to each of them. The male screw 43 is in a state in which the packing retainer clamping portion 23 is sandwiched and fixed to the packing retainer 12 in the direction of the valve stem axis (direction along the arrow Y in FIG. 2) from the casing presser fixing portion side (FIG. 2). , 7 is screwed into the through hole 44 and protrudes from the packing presser fixing part side (the arrow β side in FIGS. 2 and 7) of the through hole 44 so that the packing presser fixing part 13 can be pressed. It is configured. Thus, even if the packing retainer fixing portion 13 and the bolt 19 of the positioning mechanism or the packing retainer 12 are fixed by rust or the like, the packing retainer fixing portion 13 is pressed by screwing the male screw 43. Thus, it can be removed relatively easily.

(Connecting part)
Prior to the description of the connecting portion 25, the positional relationship between the packing press holding portion 23 and the housing holding portion 24 in the axial direction of the valve stem (the direction along the arrow Y in FIG. 2) is shown. As shown in FIGS. 2 and 9, the packing retainer holding portion 23 and the housing sandwiching portion 24 include a direction in which the packing retainer holding portion 23 holds the packing retainer 12 (a direction along the arrow X <b> 2 in FIGS. 2 and 9), The casing clamping unit 24 is arranged so as to be orthogonal to the direction in which the casing 8 is clamped (the direction along the arrow X1 in FIGS. 2 and 9). Thereby, the plane parts 35a and 35b extended in the short axis direction (direction along arrow X1 in FIGS. 2 and 9) of the housing holding part 24 and the long axis direction of the packing press holding part 23 (FIGS. 2 and 9). The flat portions 41a and 41b provided in the direction along the arrow X2 are arranged so as to overlap each other when viewed in the valve stem axial direction (viewed along the arrow Y in FIG. 2). Specifically, it is provided in each of the pair of openings 36 (four in total) provided in each of the flat portions 35a and 35b of the housing holding portion 24 and each of the flat portions 41a and 41b of the packing presser holding portion 23. A pair of openings 42 (a total of four) are arranged in a one-to-one correspondence when viewed in the direction of the valve stem axis (viewed along the arrow Y in FIG. 2).
The connecting portion 25 is provided in each of the pair of openings 36 (four in total) provided in each of the flat portions 35 a and 35 b of the housing holding portion 24 and the flat portions 41 a and 41 b of the packing press holding portion 23. A pair of openings 42 (four in total) correspond to the openings 36 and the openings 36 in a state where they are arranged in a one-to-one correspondence when viewed from the valve stem axis direction (direction view along arrow Y in FIG. 2). The four bolts 46 are inserted through the opening 42 to be opened, and the four nuts 47 are screwed into the bolts 46.
The bolts 46 are inserted through the openings 36 provided in the flat portions 35a and 35b of the housing holding portion 24 and the openings 42 provided in the flat portions 41a and 41b of the packing press holding portion 23. Then, the nuts 47 are fastened to the bolts 46 so that the packing retainer sandwiching portion 23 is fixedly connected to the housing sandwiching portion 24.

[Positioning relationship between packing clamp clamping part and housing clamping part]
Normally, in the valve mechanism 100, as shown in FIG. 4, the packing presser 12 is sandwiched in the part where the packing presser holding portion 23 is provided in the valve stem axis direction (the direction along the arrow Y axis in FIG. 4). A pair of yokes 14a and 14b are provided at opposing positions. On the other hand, at the portion where the housing clamping portion 24 is provided, the plate-like portion 15 is provided along the facing direction of the pair of yokes 14a and 14b (the direction along the arrow X2 in FIG. 4).
For the valve mechanism 100, as shown in FIG. 8, the packing presser clamping portion 23 has a pair of directions in which the packing presser 12 is clamped as viewed in the valve stem axial direction (viewed along the arrow Y in FIG. 8). It arrange | positions along the opposing direction of yoke 14a, 14b. Further, the casing clamping unit 24 is arranged with the direction in which the casing 8 is clamped orthogonal to the plane of the plate-like part 15 when viewed from the valve stem axis direction (viewed along the arrow Y in FIG. 8). . That is, while arranging the pair of long members 27a and 27b of the packing presser clamping portion 23 with the short axis direction (the direction along X2 in FIG. 8) along the opposing direction of the pair of yokes 14a and 14b, The pair of longitudinal members 32 a and 32 b of the housing holding portion 24 can be arranged in a state where the plate-like portion 15 is sandwiched. As a result, the packing retainer sandwiching portion 23 and the housing sandwiching portion 24 can be appropriately disposed without interfering with the yokes 14a and 14b and the plate-like portion 15.

[Installation process of packing jig fixing part for packing presser and replacement process of packing presser fixing part]
Next, the process of attaching the packing clamp fixing portion replacement jig of the present invention to the valve mechanism 100 and replacing the packing press fixing portion 13 will be described in order.
1. Attachment of the case clamping unit First, the case holding unit 24 is clamped and fixed to the case 8. Specifically, as shown in FIGS. 5 and 6, the casing holding portion 24 is a state in which a pair of longitudinal members 32 a and 32 b are arranged along the outer peripheral portion 50 at the outer end of the valve stem through hole 9. Then, by being fastened by the four first bolt / nut mechanisms 51 (two in FIG. 5 and four in FIG. 6), they are clamped and fixed to the housing 8. At this time, the pair of longitudinal members 32 a and 32 b are arranged in a state in which the longitudinal direction (the direction along X <b> 2 in FIG. 6) is along the plate-like portion 15 provided in the housing 8.
2. Next, as shown in FIG. 6, the movement restricting portion 26 rotates the cylindrical female screw portion 38 engaged with the rod-like male screw portion 37 to hold the housing. The length from the end portion 39 on the side portion to the end portion 40 on the heel side is adjusted. As a result, in a state where the casing clamping portion 24 is clamped and fixed to the casing 8, the end portion 40 on the flange portion side of the movement restricting portion 26 is brought into contact with the flange portion 10, and the casing clamping portion 24 is The movement from the inside of the housing to the outside of the housing (arrow β side in FIG. 6) is appropriately restricted in the direction (the direction along arrow Y in FIG. 6).
3. Next, as shown in FIGS. 7 and 8, the packing holder 12 is clamped from the outer diameter side in the valve stem radial direction (the direction along the arrow X2 in FIG. 8) by the packing holder clamping section 23. . Specifically, the packing presser clamping unit 23 arranges a pair of longitudinal members 27 a and 27 b along the outer periphery of the packing presser 12. Thereafter, the pair of longitudinal members 27a and 27b are fastened by four second bolt / nut mechanisms 29 (four in FIG. 7 and two in FIG. 8). Thereby, the packing presser clamping unit 23 is clamped and fixed to the packing presser 12.
Here, as shown in FIGS. 2 and 9, the packing retainer holding portion 23 and the housing sandwiching portion 24 include a direction in which the packing retainer sandwiching portion 23 sandwiches the packing retainer 12 (a direction along the arrow X <b> 2 in FIG. 2). The casing clamping unit 24 is arranged so as to be orthogonal to the direction in which the casing 8 is clamped (the direction along the arrow X1 in FIG. 2). Thereby, the plane parts 35a and 35b extended in the short axis direction (direction along arrow X1 in FIGS. 2 and 9) of the housing holding part 24 and the long axis direction of the packing press holding part 23 (FIGS. 2 and 9). The flat portions 41a and 41b provided in the direction along the arrow X2 are arranged so as to overlap each other when viewed in the valve stem axial direction (viewed along the arrow Y in FIG. 2). Specifically, it is provided in each of the pair of openings 36 (four in total) provided in each of the flat portions 35a and 35b of the housing holding portion 24 and each of the flat portions 41a and 41b of the packing presser holding portion 23. A pair of openings 42 (a total of four) are arranged in a one-to-one correspondence when viewed in the direction of the valve stem axis (viewed along the arrow Y in FIG. 2).
4). Attaching the connecting portion The connecting portion 25 includes a pair of openings 36 (four in total) provided in each of the flat portions 35a and 35b of the housing holding portion 24, and the flat portions 41a and 41b of the packing press holding portion 23. A pair of openings 42 (a total of four) provided in each of the openings are arranged in a one-to-one correspondence with the valve stem axial view (viewed along arrow Y in FIG. 2). Four bolts 46 are inserted through the opening 36 corresponding to 36. Then, the nuts 47 are fastened to the bolts 46 so that the packing retainer holding portion 23 is fixedly connected to the housing holding portion 24.
As described above, the packing presser 12 is appropriately clamped by the packing presser clamping part 23, and the packing presser clamping part 23 is clamped and fixed to the housing 8, and at the movement restricting part 26, the valve stem axial direction ( Appropriately via the connecting part 25 for the case holding part 24 in which the movement from the inside of the case to the outside of the case (in the direction of arrow β in FIG. 2) in the direction along the arrow Y in FIG. It will be fixedly connected to.
As a result, the packing presser 12 is moved from the inside of the housing to the outside of the housing (indicated by the arrow in FIGS. 7 and 8) in the direction of the valve stem axis (the direction along the arrow Y in FIGS. Even when fluid pressure is applied to the β side), the frictional force accompanying the clamping force of the casing clamping portion 24 to the casing 8 in the valve stem axial direction (the direction along the arrow Y in FIGS. 7 and 8). And the tension force caused by the contact of the movement restricting portion 26 with the flange portion 10 is appropriately positioned.
5. Removal of packing retainer fixing portion As shown in FIGS. 10 (a) to 10 (b) and FIGS. 11 (a) to 11 (b), the packing retainer fixing portion 13 is bolted to the nut 18 of the positioning mechanism. Remove from 19. Next, the male screw 43 is penetrated from the housing side toward the packing presser fixing portion side (arrow β side in FIGS. 10 and 11) in the valve stem axis direction (direction along arrow Y in FIGS. 10 and 11). The screw 44 is screwed and protruded from the packing retainer fixing portion side of the through hole 44 (arrow β side in FIGS. 10 and 11) to press the packing retainer fixing portion 13. As a result, even when the packing retainer fixing portion 13 and the bolt 19 of the positioning mechanism and the packing retainer 12 are fixed due to rust or the like, the packing retainer fixing portion 13 can be moved without moving the packing retainer. It can be appropriately removed from the positioning mechanism and replaced with a new packing retainer 13.

[Another embodiment]
(A) In the above embodiment, as the valve mechanism 100, the valve body 6 moves in the radial direction of the fluid pipe 2 as the valve stem 7 moves in the valve stem axial direction (the direction along the arrow Y in FIGS. 3 and 4). The flow rate control valve which controls the flow rate of the fluid which circulates through the fluid pipe | tube by moving by was shown. The replacement jig for the packing retainer fixing portion of the present invention can be applied to other than such a flow control valve. For example, the valve body 6 is connected to the fluid pipe along with the rotation of the valve stem 7 around the valve stem axis. 2 can be applied to a butterfly valve or the like that controls the flow rate of the fluid flowing through the fluid pipe.

(B)
In the above embodiment, the shape and number of the disclosed bolts and nuts can be appropriately changed depending on the state of the valve mechanism 100 to which the present invention is applied, and is not limited to the above embodiment.

(C)
In the above embodiment, the male screw portion 43 is fixed to the through hole 44 of the flat surface portions 41a and 41b of the packing retainer holding portion 23 from the housing side in the valve stem axial direction (the direction along the arrow Y in FIG. 2). The packing presser fixing part 13 is screwed into the part side (arrow β side in FIGS. 2 and 7) and protrudes from the housing side of the through hole 44 to the packing presser fixing part side (arrow β side in FIGS. 2 and 7). Is configured to be pressable.
The male screw portion 43 is inserted into the through hole 44 of the flat surface portions 41a and 41b of the packing retainer holding portion 23 from the packing retainer fixing portion side to the housing side (in the direction along the arrow Y in FIG. 2). In the state of being screwed in advance to the opposite side of the arrow β in 2 and 7, and projecting from the housing side to the packing presser fixing part side (arrow β side in FIGS. 2 and 7) in a form of loosening the screwing. The packing presser fixing portion 13 can be configured to be pressed.

(D)
In the process of removing the packing presser fixing part 13, even after the nut 18 is removed, the packing presser fixing part 13 may be fixed to the valve stem 7 by rust or the like, and the packing presser fixing part 13 is removed. However, it may take time.
In such a case, a pair of pressing members are arranged between the packing presser fixing portion 13 and the packing presser 12 in the valve stem axis direction (the direction along the arrow Y in FIGS. 10 and 11). The valve rod 7 may be sandwiched and disposed in contact with the end of the packing presser fixing portion side (arrow β side in FIGS. 10 and 11). Thereby, it can prevent more appropriately that the packing retainer 12 moves to the packing retainer fixing | fixed part side (arrow (beta) side in FIG. 10, 11) from the housing | casing side.

  The replacement jig for the packing retainer fixing portion of the present invention prevents the packing and the packing retainer from coming off and replaces the fluid such as LNG even when the fluid pipe is in the live tube state. Can be effectively used as an exchange jig for the packing retainer fixing portion that prevents leakage from the inside of the housing to the outside.

2: Fluid pipe 6: Valve body 7: Valve stem 8: Housing 9: Valve stem through hole 10: Hook 11: Packing 12: Packing presser 13: Packing presser fixing part 22: Through hole (packing presser fixing part)
23: Packing presser holding part 24: Housing holding part 25: Connection part 26: Movement restricting part 27a: Longitudinal member (packing presser holding part)
27b: Longitudinal member (packing clamp holding portion)
32a: Longitudinal member (housing clamping part)
32b: Longitudinal member (housing clamping part)
37: Rod-shaped male screw portion 38: Cylindrical female screw portion 39: End portion 40 on the side of the casing clamping portion: End portion on the flange portion side 43: Male screw 44: Through hole 50: On the outer end of the valve rod through hole The outer periphery

Claims (5)

A valve body for controlling a flow rate of a fluid flowing through a fluid pipe; a valve rod having one end connected to the valve body and extending in a pipe diameter direction of the fluid pipe; and the valve body and a part of the valve stem And a valve rod through hole through which the valve rod penetrates the housing,
A seal that seals between the flange provided in the housing in a form protruding in the valve rod radial direction on the outer peripheral portion of the outer end of the valve rod through hole, and the valve rod through hole and the valve rod And a packing presser for pressing the packing from the outside of the housing to the inside of the housing in the direction of the valve stem axis, the position of the packing presser being fixed in the valve stem axis direction by the housing, and the packing presser in the direction of the valve stem axis A packing presser fixing part replacement jig used in a valve mechanism including a packing presser fixing part that regulates movement from the inner side of the casing to the outer side of the casing,
A packing press clamping portion capable of clamping the packing press from the outer diameter side of the valve stem radial direction;
A housing clamping portion capable of clamping the housing from the outer diameter side in the valve stem radial direction;
A connecting portion capable of fixedly connecting the packing clamp holding portion to the casing holding portion in the valve stem axis direction;
One end is fixed to the housing holding portion, and the other end is in contact with the flange portion to move the housing holding portion from the inside of the housing to the outside of the housing in the valve stem axis direction. An exchange jig for a packing presser fixing portion, which includes a movement restricting portion to be restricted.   2. The packing presser fixing portion replacement jig according to claim 1, wherein the movement restricting portion has an adjustment mechanism capable of adjusting a length from an end portion on the housing clamping portion side to an end portion on the flange portion side.   The said adjustment mechanism is comprised from the rod-shaped male screw part fixed to the said housing | casing clamping part, and the cylindrical female screw part which has an internal peripheral surface screwed together to the said rod-shaped male screw part. Fixing jig for packing presser fixing part. The packing retainer sandwiching portion and the housing sandwiching portion are each provided with a pair of longitudinal members,
The direction in which the packing retainer sandwiching portion sandwiches the packing retainer is the short axis direction of the pair of long members constituting the packing retainer sandwiching portion as viewed in the valve stem axial direction, and the housing sandwiching portion is the housing. The direction in which the body is clamped is the minor axis direction of the pair of long members constituting the packing press clamp portion as viewed in the valve stem axis direction,
4. The direction in which the packing retainer sandwiching portion sandwiches the packing retainer and the direction in which the housing sandwiching portion sandwiches the casing are orthogonal to each other as viewed in the valve stem axis direction. 5. The replacement jig for the packing presser fixing part described in the above section. The packing presser clamping portion is provided with a through hole in which a female screw is screwed in the valve stem axis direction, and a male screw that can be screwed into the through hole,
The male screw is screwed into the through hole from the housing side toward the packing presser fixing part side in the valve stem axis direction, and protrudes from the packing presser fixing part side of the through hole. The packing presser fixing part replacement jig according to any one of claims 1 to 4, wherein the presser fixing part can be pressed.

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