JP2004150611A - Pipe joint and valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint structure for easily preventing the rotation of a joint body and a nut without interrupting pipe connecting work for a pipe joint. <P>SOLUTION: The pipe joint 120 has the joint body 121 and a rotating operation member 122 rotatably mounted on the joint body for pipe connection with rotating operation. It comprises a first engagement structure provided on the joint body, a second engagement structure provided on the rotating operation member, and a rotation preventing tool 130 for engaging with the first engagement structure and the second engagement structure detachably from the externals in the rotating direction of the rotating operation member. The rotation preventing tool 130 has a tool body 131 and a holding arm 132. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe joint and a valve, and is particularly suitable when applied to a pipe joint of a type in which a pipe connected to a joint body of the pipe joint is rotatable in a state where the pipe is connected to the pipe joint. About the structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a pipe joint, one configured to connect and fix a pipe by inserting an end of the pipe and rotating a nut rotatably attached to a joint body is used. As such a pipe joint, there is a pipe joint having a structure in which a joint main body and a pipe are rotatable in a state where the pipe is connected and fixed.
[0003]
For example, a pipe connection part rotatably attached to the joint body is provided, and a nut and a retainer that are screwed to each other are provided in the pipe connection part, and the retainer tightens the pipe by rotating the nut. A pipe joint configured as described above is known. As a configuration example of the pipe connection portion, a nut member is provided with a tapered female screw portion, and a retainer is provided with a top member that is pressed by the pushing action of the tapered female screw portion and protrudes from the inner surface when screwed into the nut. Some are provided. In this pipe connecting portion, when the end of the pipe is inserted into the retainer and the nut is rotated, the retainer is gradually screwed into the nut, and accordingly, the top member becomes the tapered female screw portion of the nut. As a result, the pipe connection portion and the pipe are connected and fixed to protrude from the inner surface of the retainer and tighten the outer peripheral surface of the pipe. In addition, the pipe fastening structure of the pipe connection portion is described in, for example, Patent Document 1 below.
[0004]
[Patent Document 1]
JP-A-10-231967
[0005]
[Problems to be solved by the invention]
However, when the above-mentioned fittings are provided at both ends of the valve, the valve and the pipe are configured to be rotatable when a force is applied to operate the valve after connecting and installing the pipe to the fitting of the valve. Therefore, there is a problem that the valve rotates around the axis of the pipe, and it becomes difficult to open and close the valve. Such a situation does not occur when a high-pressure fluid flows through a pipe or a valve because the high internal pressure increases the rotational resistance between the valve and the pipe, but when the fluid does not flow through the pipeline. When the internal pressure of the fluid is low, the valve rotates easily with respect to the pipe, so that additional work such as fixing the valve to a wall surface is required.
[0006]
In addition, even if it is not a pipe joint having the above structure, in a pipe joint provided with a rotatable nut at the end of the joint body, the operability is impaired, and in some cases, the sealability is lost. May be given.
[0007]
Therefore, the present invention is to solve the above-mentioned problem, and an object thereof is to provide a structure of a pipe joint that can easily prevent rotation of a joint body and a nut without hindering a pipe connection operation of the pipe joint. It is in.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the pipe joint of the present invention is a pipe joint having a joint body and a rotation operation member rotatably attached to the joint body and enabling connection of a pipe by a rotation operation. A first engagement structure provided on the joint body, a second engagement structure provided on the rotary operation member, and both the first engagement structure and the second engagement structure are external. And a rotation preventing member which is detachably engaged with the rotation operation member in a rotation direction of the rotation operation member.
[0009]
According to the present invention, the rotation prevention member is engaged with the first engagement structure and the second engagement structure in the rotational direction, thereby preventing relative rotation between the joint body and the rotation operation member. be able to. Here, since the anti-rotation device is configured to be detachably engageable with the engagement structure from the outside, the rotation operation member is rotated without attaching the anti-rotation device during the pipe connection work. When the work is performed and the connection of the pipe is completed, the rotation preventing device can be externally engaged with the engagement structure to prevent the rotation of the rotation operating member. Therefore, the rotation of the rotary operation member can be easily prevented without hindering the pipe connection operation.
[0010]
In the present invention, the first engagement structure is an engagement hole provided in the joint main body, and the second engagement structure is configured such that when the engagement angle is adjusted to the same rotation angle as the engagement hole, Preferably, the opening faces the mating hole. According to this, by simply inserting the anti-rotation tool through the opening as the second engagement structure into the engagement hole as the first engagement structure, the joint body and the rotation operating member can be connected via the anti-rotation tool. Engagement in the direction of rotation can prevent relative rotation. Therefore, the first engagement structure, the second engagement structure, and the rotation preventing device can be made simple and compact. Here, the opening can be engaged with the rotation preventing member in the rotation direction of the rotation operating member, and can be externally accessed through the opening to the engagement hole of the joint body. If so, any opening shape may be provided. Therefore, it may be a notch formed at the end of the rotary operation member, or may be a through hole penetrating the rotary operation member.
[0011]
In the present invention, it is preferable that the opening is a cutout provided at an edge of the rotary operation member. According to this, since the opening, which is the second engagement structure, is a cutout provided at the edge of the rotary operation member, it is only necessary to process the edge of the rotary operation member, so that it is simple. And the first engagement structure corresponding to the cutout portion is formed near the edge of the rotary operation member, so that the first engagement structure can be visually recognized from the outside. Since the design of the configuration is sufficiently possible, the first engagement structure and the second engagement structure, which are made visible, can be easily matched with each other, so that the work of attaching the rotation preventing device can be easily performed. It becomes possible.
[0012]
In the present invention, the rotation preventer holds the preventer main body engaged with the first engagement structure and the second engagement structure, and holds the preventer main body on the joint main body or the rotation operating member. It is preferable to have a holding means for the above. According to this, both the joint body and the rotation operating member are engaged by the preventer body to prevent relative rotation of both, and the preventer body is held by the joint body or the rotation operating member by holding means. Therefore, an accident that the anti-rotation device comes off can be prevented, and the relative rotation between the joint body and the rotary operation member can be more reliably prevented. The holding means includes, in addition to a holding arm described later, any means capable of holding the rotation preventing tool on the joint body or the rotation operation member, for example, a screwing structure between the rotation preventing tool and the joint body.
[0013]
In the present invention, it is preferable that the holding means includes a holding arm which can be elastically engaged with the joint body or the outer surface of the rotary operation member in a state of holding the outer surface of the joint body in the rotation direction. According to this, since the holding arm can be elastically engaged with the joint body or the rotation operation member, the preventer body can be easily and detachably attached to the joint body or the rotation operation member. In particular, since the holding arm is elastically engaged with the joint body or the outer surface of the rotation operating member in a state of holding the outer surface of the rotation operation member in the rotation direction, a complicated operation is not required for attaching and detaching the rotation preventing device. Further, since the holding force is generated by the elastic engagement of the holding arm extending in the rotation direction, the holding force can be generated without changing the shape of the joint body and the rotation operation member (for example, in the rotation direction). The curved C-shaped arm can be engaged and held so as to grasp the joint main body or the rotation operating member.), So that the structure of the pipe joint can be simplified and a rotation prevention device is attached. Not easy to remodel from normal structure. Further, since the holding arm can be formed along the outer surface of the joint main body or the rotation operation member, the rotation preventing device can be made compact in the mounted state.
[0014]
In the present invention, it is preferable that the joint body or the rotation operation member is provided with a guide groove configured to be engageable with the holding arm and extending in the rotation direction. By providing the guide groove extending in the rotation direction that can be engaged with the holding arm, the mounting posture of the holding arm is guided by the guide groove. Since the rotation preventing device can be smoothly rotated by the guide function of the holding arm, the rotation preventing device is engaged with one of the joint body and the rotation operating member, and the rotation preventing device is moved together with the one with respect to the other. By rotating them relative to each other, they can be mounted in such a manner that the anti-rotation device is engaged with the other.
[0015]
In the present invention, a retainer which is screwed with the rotary operation member is provided, and the retainer is configured to tighten the tube by screwing the rotary operation member into the retainer with the tube inserted inside the retainer. Is preferred. According to this, the pipe is tightened and fixed by screwing the rotary operation member into the retainer. At this time, if both the rotation operation member and the retainer are configured to be rotatable with respect to the joint body, the joint body and the pipe are configured to be relatively rotatable. The rotation of the joint body and the pipe can be prevented by using.
[0016]
A valve according to the present invention includes the pipe joint according to any one of the above aspects.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a pipe joint and a valve according to the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic front view showing the entire configuration of a valve according to the present invention, and FIG. 2 is a longitudinal sectional view (A-A sectional view of FIG. 1) (A) and a front view (in the direction B of FIG. 1) of the pipe joint 120. FIG. 3 is a front view of the valve box and the rotation operation member, and FIG. 3 is a partial cross-sectional plan view of the valve box.
[0018]
The valve 100 has a valve body 110 and pipe joints 120 provided at both ends of the valve body 110. The valve body 110 has a valve box 111, a valve body 112 (not shown) housed in the valve box 111, a valve shaft 113 connected to the valve body 112, and a handle 114 attached to the valve shaft 113. . As the valve, any type of valve structure such as a gate valve, a ball valve, a butterfly valve, and a check valve can be applied. Also, as the handle 114, a lever-type handle or the like can be used in addition to the dial-type handle in the illustrated example.
[0019]
The pipe joint 120 has a joint main body 121, a rotation operation member (nut) 122 rotatably attached to the joint main body 121, and a retainer 123 screwed to the rotation operation member 122. The joint body 121 is formed integrally with the valve box 111. As shown in FIG. 4, an annular groove 121s is formed on the outer peripheral surface of the joint body 121, and a holding ring 124 is fitted in the annular groove 121s as shown in FIG.
[0020]
The rotation operation member 122 is formed in a substantially cylindrical shape, and is rotatably mounted on the joint body 121 from the outside. On the inner peripheral surface of the rotation operation member 122, a tapered female screw portion 122a inclined in the axial direction (left and right directions in the drawing) is formed. An end 122b of the rotation operating member 122 on the joint body 121 side is axially engaged with the holding ring 124 so that the rotation operating member 122 is not detached from the joint body 121. A support spacer 127 and a flexible sealing ring (O-ring) 128 are interposed between the joint main body 121 and the rotation operation member 122.
[0021]
The retainer 123 is formed in a substantially cylindrical shape, and has a male screw portion 123a formed on an outer peripheral surface thereof. The male screw portion 123a is screwed into the female screw portion 122a of the rotation operation member 122. In a region where the male screw portion 123a is formed on the outer peripheral surface of the retainer 123, a through portion penetrating into and out of the retainer 123 is provided, and a top member 125 is fitted and held inside the through portion. On the surface of the top member 125, a male screw portion substantially aligned with the male screw portion 123a is formed. The top member 125 is accommodated in the through portion so as to be rotatable around an axis. In the state shown in FIG. 2, that is, when the retainer 123 is not deeply screwed into the rotation operation member 122, the top member 125 is housed in the through-hole while projecting slightly outward from the surface of the male screw portion 123 a. However, as described later, when the retainer 123 is screwed deeply into the rotary operation member 122 as shown in FIG. 5, the retainer 123 is pressed inward by the female screw portion 122a of the rotary operation member 122, and Is configured to be housed in the above-mentioned penetrating portion in a state of slightly protruding inward from the inner peripheral surface.
[0022]
A display ring 126 made of an elastic material is attached to the retainer 123 at a position adjacent to the distal end of the male screw portion 123a. The display ring 126 is configured to have a different appearance (color or pattern) from the rotation operation member 122 and the retainer 123.
[0023]
As shown in FIG. 2, an engagement hole 121c is formed on the outer peripheral surface of the joint main body 121. The engagement holes 121c are provided on the front side and the back side of the joint body 121, respectively. The engagement hole 121c has a circular shape in plan view. A guide groove 121 d extending in the rotation direction of the rotation operation member 122 is formed on the outer peripheral surface of the joint body 121. In the case of the present embodiment, the guide groove 121d is formed in an annular shape over the entire circumference. The guide groove 121d is formed at the same position in the axial direction as the engaging hole 121c, and communicates with the engaging hole 121c.
[0024]
On the other hand, as shown in FIG. 4, the rotary operation member 122 has a notch 122 c at an end on the joint body 121 side as an opening penetrating in and out of the rotary operation member 122. In the illustrated example, the cutout portion 122c has an arc-shaped cutout edge. Here, when the rotation operation member 122 is attached to the joint body 121, the engagement hole 121c and the notch 122c are formed so that their axial positions are the same. . That is, by rotating the rotation operation member 122 so that the rotation angle between the engagement hole 121c of the joint main body 121 and the notch portion 122c of the rotation operation member 122 matches, the notch portion 122c faces the engagement hole 121c. It is configured as follows. More specifically, the notch 122c and the engagement hole 121c are formed so as to be arranged concentrically with each other when the rotation angles are matched as described above.
[0025]
An anti-rotation device 130 is detachably attached to the engagement hole 121c and the guide groove 121d from the outside. As shown in FIG. 3, the rotation preventing device 130 has a main body 131 of the preventing device and a holding arm 132. The prevention tool main body 131 is provided with an engagement portion 131a that can be inserted into the engagement hole 121c and the cutout portion 122c. Further, a projection 131b protruding from the tip of the engagement portion 131a is formed. On the other hand, the holding arm 132 is fixed to the protector main body 131, and also protrudes from both sides of the protector main body 131 to both sides, and each has a shape curved toward the tip end side of the protector main body 131, and as a whole, is C-shaped. It is configured into a shape. The holding arm 132 is configured to be elastically deformable, and is preferably formed of a metal material having elasticity.
[0026]
In the present embodiment having the above-described configuration, the rotation preventing member 130 is removed from the pipe joint 120 (the state of the pipe coupling illustrated on the right side of FIG. 1), and the rotation operating member is set as shown in FIG. 5 is inserted into the retainer 123 in a state where the retainer 123 is engaged with the retainer 123 shallowly, and the end of the tube 10 is located at a position deeper than the sealing ring 128 and It is made to reach a position inside the main body 121 (preferably, a position where it hits a step on the inner peripheral surface of the joint main body 121). Next, the retainer 123 is screwed into the rotation operation member 122 until some resistance is felt. Then, the screwing depth of the retainer 123 is increased by rotating the rotation operation member 122 using a tool or the like. Then, the top member 125 attached to the retainer 123 is gradually pressed inward by the tapered female screw portion 122 of the rotation operating member 122, and a part thereof projects from the inner peripheral surface of the retainer 123, and Rotating while cutting into the surface. When the display ring 126 attached to the retainer 123 is screwed until the display ring 126 is hidden by the edge of the rotary operation member 122 and cannot be seen, the end of the tube 10 is rotated by the rotary operation member 122 and the retainer 123 as shown in FIG. The part is fixed firmly. In this state, the support spacer 127 is pressed against the joint main body 121 by the end of the retainer 123, whereby the sealing ring 128 is tightly adhered to the outer peripheral surface of the pipe 10. It is possible to ensure the sealing between the two.
[0027]
When the pipe 10 is connected to the pipe joint 120 as described above, the joint main body 121, the rotary operation member 122, the retainer 123, and the pipe 10 are simply pressed into contact with each other via the sealing ring 128. The latter is mutually rotatable around the axis. If the internal pressure rises by flowing a high-pressure fluid through the pipe joint 120 and the pipe 10, the former and the latter do not rotate with each other, but if the internal pressure is low, the rotatable state does not change.
[0028]
In the above state, the former and the latter can be fixed in a non-rotatable state by engaging the rotation preventing device 130 with the joint main body 121 and the rotation operation member 122. That is, by inserting the engaging portion 131a of the prevention device main body 131 of the rotation prevention device 130 into the engagement hole 121c of the joint main body 121 through the cutout portion 122c of the rotation operation member 122, the joint through the rotation prevention device 130 is prevented. The main body 121 and the rotation operation member 122 are in a state where they are mutually restricted in the rotation direction.
[0029]
As a procedure for attaching the above-described rotation preventing device 130, for example, the following method can be mentioned. First, the engaging portion 131a of the main body 131 is engaged with the notch 122c of the rotation operating member 122 while pressing the holding arm 132 of the rotation preventing member 130 so as to be inserted into the guide groove 121d. . In this state, when the holding arm 132 is mounted so as to hold the joint main body 121, the preventer main body 131 receives the elastic force in the direction pressed against the joint main body 121 from the holding arm 132. At this time, when the preventer main body 131 has not yet been engaged with the engagement hole 121c of the joint main body 121, the rotation preventing member 130 engaged with the notch 122c is also rotated by rotating the rotation operating member 122. Further, they rotate together, and eventually the engaging portion 131a of the preventer main body 131 encounters the engaging hole 121c, and the engaging portion 131a is fitted into the engaging hole 121c by the elastic force of the holding arm 132.
[0030]
As described above, when the anti-rotation device 130 is engaged with the notch portion 122c and the anti-rotation device 130 is not yet fitted in the engagement hole 121c, the anti-rotation device 130 rotates together with the rotation operation member 122. At this time, since the projection 131b provided at the tip of the prevention tool main body 131 is engaged with the guide groove 121d, the rotation prevention tool 130 is rotated in the rotation direction in a smooth and stable posture. It can be rotated while being engaged with the operation member 122. Since the guide groove 121d communicates with the engaging hole 121c, the protrusion 131b moves from the guide groove 121d to the engaging hole 121c as it is, whereby the engaging portion 131a of the rotation preventing device 130 is engaged. It is smoothly introduced into 121c.
[0031]
Since the rotation preventing device 130 once mounted as described above is held by the holding arm 132, the engagement is prevented from being disengaged or dropped. When removing the rotation preventing device 130, the head of the preventing device main body 131 (in the illustrated example, the outer shape (outer diameter) is slightly larger than the engaging portion 131 a for easy grasping) is pulled out. Thus, the holding arm 132 can be spread out against the elastic force of the holding arm 132 and easily removed.
[0032]
FIG. 8 is a perspective view showing a use state in which the valve 100 of the embodiment is connected to a pipe. As shown in this figure, when pipes are connected to pipe joints 120 formed at both ends of the valve 100, the valve 100 is rotatable around the pipe axis with respect to the pipe. Therefore, in this state, when the handle 114 of the valve 100 is to be rotated, the valve 100 rotates around the axis of the pipe, and there is a problem that the rotating operation of the handle 114 becomes difficult. However, by mounting the above-described rotation preventing device 130, the relative rotation between the joint body 121 integrated with the valve box 111 of the valve 100 and the rotation operation member 122 fixed to the pipe and the retainer 123 is prevented. Therefore, the handle 114 can be rotated without any trouble. In addition, since the engagement holes 121c for engaging the engagement portions 131a of the rotation preventing device 130 are provided on the front surface and the back surface of the joint body 121, respectively, when the piping is disposed along the wall surface. When the valve 110 is installed in any orientation, the one of the engagement holes always faces in a direction that does not directly face the wall surface, so that the rotation preventing device 130 can be mounted without being hindered by the wall.
[0033]
FIG. 6 is a cross-sectional view of a pipe joint 130 ′ showing a configuration example including a rotation preventing device 130 ′ different from the above embodiment. In this pipe joint 130 ', since the configuration other than the engagement hole 121c' corresponding to the engagement hole 121c and the rotation preventing tool 130 'is the same as that of the above-described embodiment, the same parts are denoted by the same reference numerals. The description thereof is omitted. The anti-rotation device 130 'is not provided with the holding arm of the above embodiment, and therefore, the joint body 121' is not provided with a guide groove for guiding the holding arm.
[0034]
In this configuration example, a female screw portion is formed on the inner surface of the engagement hole 121c 'provided in the joint main body 121'. In the rotation preventing device 130 ', an engaging portion 131a' similar to the above is formed on the preventing device main body 131 ', and a holding screw portion 132' as a holding means is provided at the tip of the engaging portion 131a '. Is formed. The holding screw portion 132 'is provided with a male screw portion configured to be screwable with a female screw portion formed on the inner surface of the engagement hole 121c'. A rotation operation engagement structure (an engagement groove, an engagement recess, or the like) 131b 'capable of rotating the rotation prevention tool 130' by engaging a tool or the like with the head of the prevention tool main body 131 '. Is provided.
[0035]
In this configuration example, the engagement angle of the engagement hole 121c 'of the joint main body 121' and the notch portion 122c (not shown) of the rotary operation member 122 are matched to each other, so that the notch is located immediately above the engagement hole 121c '. Part is arranged. Then, in this state, the anti-rotation device 130 ′ is inserted into the engagement hole 121 c ′ through the notch, and a tool or the like is engaged with the engagement structure 131 b ′ for rotation operation. By rotating, the male screw part of the holding screw part 132 'is screwed with the female screw part of the engagement hole 121c'. Thereby, since the rotation preventing member 130 'is engaged with the joint body 121' and the rotation operation member 122 in the rotation direction, the rotation operation member 122 can be fixed so as not to rotate with respect to the joint body 121 '. Further, in this configuration example, since the anti-rotation device 130 'and the engagement hole 121c' are connected by screwing, the engagement state of the anti-rotation device 130 'is released or the anti-rotation device 130' is dropped. Is prevented.
[0036]
FIG. 7 is a cross-sectional view showing another configuration example different from the above embodiment. In the pipe joint 120 "of this configuration example, the guide body is not provided with a guide groove in the joint body 121", the guide member 122 "is provided with a guide groove 122d", and the structure of the rotation preventing member 130 "is not provided. Since the structure is the same as that of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof will be omitted. And a guide groove 122d "extending in the rotational direction is formed on the outer peripheral surface of the rotary operation member 122". The guide groove 122d "is preferably an annular groove over the entire circumference.
[0037]
The anti-rotation device 130 "has a main body 131" and a holding arm 132 ". The main body 131" is provided with an engaging portion 131a "similar to that of the above-described embodiment. , Is provided at a position slightly deviated from the engaging portion 131a "of the preventer main body 131", and is configured to engage with the guide groove 122d "of the rotation operating member 122". In addition, it is preferable to provide a projection similar to that of the above-described embodiment at the tip of the engagement portion 131a ". In this case, an annular guide groove communicating with the engagement hole 121c is formed on the outer peripheral surface of the joint body 121". Is desirably provided separately. The guide groove stabilizes the rotation posture of the rotation stopper 130 ″ engaged with the cutout portion of the rotation operation member 122 at the time of mounting by guiding the protrusion.
[0038]
This configuration example is different from the above embodiment in that the holding arm 132 "is held by the rotation operation member 122", but the holding arm 132 "causes the rotation holder 130" (the holder main body 131 ") to be connected to the joint body. The point that it is held in a state of being engaged with the 121 ″ (the engaging hole 121 c ″) and the rotary operation member 122 ″ (the notched portion) is the same as the above-described embodiment. The same is true for
[0039]
It should be noted that the pipe joint and the valve of the present invention are not limited to the illustrated examples described above, and various changes can be made without departing from the spirit of the present invention. For example, a through hole may be provided instead of the notch as an opening that engages with the rotation preventing device in the rotation direction.
[0040]
【The invention's effect】
As described above, according to the present invention, the relative rotation between the joint main body of the pipe joint and the rotation operating member can be easily prevented when necessary. Particularly, when the joint body and the pipe are configured to be relatively rotatable in a state where the pipe is connected to the pipe joint, relative rotation between the joint body and the pipe can be prevented. Movement can be prevented and its operability can be ensured.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a structure of an embodiment of a pipe joint and a valve according to the present invention.
2 is a partial cross-sectional view (A) showing a cross section along the line AA shown in FIG. 1 and a partial plan view (B) viewed in the direction B of FIG. 1;
FIG. 3 is a front view (a), a plan view (b), and a side view (c) of the rotation preventing device.
FIG. 4 is a front view and a plan view showing a joint main body and a rotation operation member of the pipe joint.
FIG. 5 is a sectional view showing a state where the pipe joint of the embodiment is connected to a pipe.
FIG. 6 is a front view (a) of a rotation preventing device showing a configuration example different from the above embodiment, and a cross-sectional view (b) of a pipe joint.
FIG. 7 is a sectional view of a pipe joint showing another configuration example different from the above embodiment.
FIG. 8 is an explanatory view of a use state showing a state where the valve of the embodiment is connected to a pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... valve, 120 ... pipe joint, 121 ... joint main body, 121c ... engagement hole, 121d ... guide groove, 121s ... annular groove, 122 ... rotation operation member, 122a ... female screw part, 122b ... end part, 122c ... cutting Notches 122c, 123: retainer, 124: holding ring, 125: frame member, 130: rotation prevention tool, 131: prevention tool body, 131a: engagement part, 131b: projection, 132: holding arm

Claims (8)

A first engagement structure provided on the joint body, wherein the joint body includes a joint main body and a rotation operation member rotatably attached to the joint main body and enabling connection of a pipe by a rotation operation; A second engagement structure provided on the rotation operation member, and both the first engagement structure and the second engagement structure are detachably engaged from the outside in the rotation direction of the rotation operation member. A pipe joint comprising: The first engagement structure is an engagement hole provided in the joint body, and the second engagement structure faces the engagement hole when adjusted to the same rotation angle as the engagement hole. The pipe joint according to claim 1, wherein the pipe joint is an opening. The pipe joint according to claim 2, wherein the opening is a cutout provided at an edge of the rotary operation member. The rotation preventing device includes: a preventing device main body that engages with the first engagement structure and the second engaging structure; and a holding unit that holds the preventing device main body on the joint main body or the rotation operating member. The pipe joint according to claim 1, comprising: 5. The pipe joint according to claim 4, wherein the holding unit includes a holding arm that can be elastically engaged with the joint body or an outer surface of the rotation operation member in a state of holding the outer surface of the rotation operation member in the rotation direction. 6. The pipe joint according to claim 5, wherein the joint body or the rotation operation member is provided with a guide groove configured to be engageable with the holding arm and extending in the rotation direction. A retainer which is screwed with the rotary operation member is provided, and the retainer is configured to tighten the pipe by screwing the rotary operation member into the retainer in a state where the pipe is inserted into the retainer. The pipe joint according to any one of claims 1 to 6, wherein A valve comprising the pipe joint according to any one of claims 1 to 7.

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