JP2000065277A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint for both a valve type and a no-valve type which can install a operating valve simply as necessary, in a tube fitting composed of a no-valve type as the basic form. SOLUTION: A basic structure is a no-value type by insetting a plug 3 from the front end of a socket body 20 in a locking form or lock releasable form, and connecting to pass the fluid. In the no-valve type tube fitting, a valve unit can be inserted from the rear end to the inside of an adaptor 30 at the socket 2 side simply, and installed to a specific position, and corresponding to the installing of the valve unit, a valve opening piece 3b is installed to the tip of the plug 3 side simply. As a result, the tube fitting is utilized as a valve integral type of this pipe joint 1. The positioning of the value unit is carried out by utilizing a fluid tube 4, and a stopper step 4a provided at the front end is abutted to the rear end of a unit side valve seat member 51 so as to fix the valve unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used as a fluid coupling in various fluid devices using hydraulic pressure, water pressure, pneumatic pressure, vacuum and the like.

[0002]

2. Description of the Related Art Conventionally, a large number of pipe joints comprising a socket and a plug, which are detachably connected by an appropriate locking means, and which allow fluid to flow by connecting the socket and the plug, have been manufactured and used in various fields. I have. This type of pipe joint includes a valveless type without a valve for opening and closing, and an integrated pipe joint with a valve having a built-in valve on the socket side and having an opening / closing mechanism. In the case of this type of fitting with a valve, when a plug is inserted into and connected to the socket, a valve in the socket is pushed open at the tip of the plug, and a fluid can be circulated.

[0003]

However, as described above, since two types of pipe fittings, with and without a valve, are selectively used depending on the application, the number of types increases, which is inconvenient in terms of manufacturing and inventory. There is.

[0004] Therefore, an object of the present invention is to provide a pipe joint having a valveless type as a basic form, which can easily be equipped with an open / close valve as required.
An object of the present invention is to provide a non-type dual-use fitting.

[0005]

According to a first aspect of the present invention, there is provided a pipe joint comprising a socket and a plug which are removably connected by an appropriate locking means, and a fluid can flow through the connection between the socket and the plug. A valve unit which has a valve body movable in the opening and closing direction, is inserted from the rear end into the socket as required, and is mounted at a predetermined position, and a valve unit comprising: Positioning means for fixing the plug unit at a predetermined position in the socket, and mountable at the tip of the plug, and mounted at the tip of the plug corresponding to mounting of the valve unit on the socket; A valve opening piece for pressing a valve body of the valve unit mounted in the socket in an opening direction by insertion into the socket. It has been.

[0006] With the above structure, the valve unit is easily assembled in the socket, and the valve-opening piece is easily attached to the tip of the plug side in correspondence with the valve unit, so that the valve-less type pipe joint can be provided with the valve. It can be conveniently used as an integral pipe fitting.

Further, in the pipe joint according to the present invention, the positioning means is a fluid pipe connected to a rear end of the socket after the valve unit is mounted, and a front end face on a connection side of the fluid pipe is connected to the fluid pipe. The valve unit is fixed to the predetermined position by contacting the rear end of the valve unit.

In this case, the fluid pipe is connected to the socket after the valve unit is assembled from the rear end in the same direction, and the front end of the fluid pipe is used to abut against the rear end of the valve unit to be fixed. . Because it uses fluid pipes that are connected,
There is an advantage that no special positioning means for positioning the valve unit is required.

According to a third aspect of the present invention, in the pipe joint, the positioning means is an annular stop ring which is retrofitted into the socket, and the stop ring is applied to a rear end of the valve unit. It is characterized in that it is brought into contact with and fixed at the predetermined position.

In this case, a stop ring is used as the positioning means. In this case, the valve unit is positioned by the stop ring at an arbitrary position in the socket without using the tip of the fluid pipe as described in the second aspect. It is effective for

Further, in the pipe joint according to the fourth aspect, the valve unit is positioned at a predetermined position in the socket by the positioning means, and a plug is inserted from a closed state by an urging force. A valve body that moves in a direction to open against the urging force by the contact of the valve opening piece at that time. That is, by configuring the valve unit as described above, it is possible to fix the positioning by abutting the front end of the fluid pipe against the rear end of the valve seat member, and to fasten the stop ring to the rear end of the valve seat member. Positioning and fixing, making it easier to respond.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a pipe joint according to the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show a valveless pipe joint which is a basic structure for constituting the present invention. The pipe joint can be roughly divided into a socket 2 on one side which can be connected and separated and a plug 3 on the other side of the pipe. The upstream and downstream fluid pipes 4 and 5 are connected to respective rear ends of the pipes so as to communicate with each other. In a state where it can be distributed.

In FIG. 1, the socket 2 comprises a cylindrical socket body 20 and an adapter 30 which are integrally connected by inner and outer fitting. On the outer peripheral surface of the socket body 20, a cylindrical sleeve 40 can be moved forward and backward on the joint axis CC by manual operation.

The socket body 20 has a front end 21 at the right end in the drawing facing the insertion connection of the plug 3. A plurality of holes 22 are provided in the circumferential direction at a position slightly behind the front end 21 of the socket body 20. An arc-shaped lock claw 10 is fitted in each hole 22 so as to be able to protrude and retract as a lock. In this embodiment, the locking element uses the lock claw 10, but is not limited to this, and may be a lock ball or a lock pin. Such a lock claw 1
Numeral 0 is supported by an annular movable support ring 11 arranged in the socket body 20 from the inside.

The movable support ring 11 is moved from the stationary position shown in FIG.
Can slide in the socket body 20 in the left retreating direction in FIG. That is, the spring 12 is mounted between the adapter 30 and the stepped portion 31 provided at the front end thereof, and urges the movable support ring 11 to return to the right forward direction in the figure for returning the movable support ring 11 to the normal position. Further, the movable support ring 11 is provided with a tapered surface 11a whose diameter is gradually reduced in the ring thickness direction. That is, when the plug 3 is engaged with and inserted into the movable support ring 11 at the initial stage of insertion, the plug 3 is guided by the tapered surface 11 a so as to be easily centered on the joint axis CC, and adapted to the socket body 20. That's why.

Next, the sleeve 40, which can be advanced and retracted on the outer periphery of the socket body 20, is provided with an annular concave portion 41 on the entire inner periphery at the front end thereof, and embraces a plurality of lock claws 10 from outside. As a result, the sleeve 40 is
From the hole 22 to the outside. The main function of the sleeve 40 is to push the lock claw 10 into the hole 22 by advancing operation in the right direction, to protrude into the socket body 20, and to lock and lock the movement of the plug 3. In order to facilitate the pushing of the lock claw 10 into the hole 22, a pressing tapered surface 41 a and a suppressing surface 41 b are formed continuously inside the annular concave portion 41.

The sleeve 40 and the socket body 2
A spring 43 is mounted in the closed space 42 between the zeros, and urges the sleeve 40 forward. As means for restricting the forward movement of the sleeve 40 in the forward biased state, a convex stopper 23 is provided on the outer periphery near the front side of the hole 22 provided in the socket body 20.

Between the sleeve 40 and the socket body 20, there is further mounted a stopper ring 14 formed in an overall C-shape which is linked to the relative movement of the two members. The stopper ring 14 engages with the groove of the annular groove 24 provided on the outer periphery of the socket body 20 and the annular recess 44 provided on the inner periphery of the sleeve 40, respectively, and expands and contracts the diameter in a C-shape. Elastically deformable. A stopper step 14 a is provided on a part of the stopper ring 14, and the rear end 4
5 to prevent the sleeve 40 from retreating.

Further, on the inner periphery of the front end of the adapter 30,
O-ring 15 and packing 16 of the sealing member are attached,
The required airtightness and liquid tightness between the members are secured by elastically pressing and closely contacting the outer peripheral surface of the plug 3 after insertion.

On the other hand, as shown in FIG. 2, the basic structure of the plug 3 corresponding to the valveless type pipe joint has an annular lock groove 3a formed on the outer peripheral surface of the distal end portion thereof. The pawl 10 fits into the lock groove 3a and can be engaged. This prevents the plug 3 after being inserted from coming out of the socket 2, that is, the plug 3 can be locked by sealing the longitudinal movement of the plug 3.

In the above-described valveless type pipe joint, the valve unit 50, which is a necessary member, is simply incorporated into the adapter 20 on the socket 2 side if necessary, and the plug unit 3 is correspondingly installed on the plug unit side. As shown in FIG. 2, the valve opening piece 3b can be easily attached. By doing so, the valve-less type pipe joint can be easily made into a valve-integrated pipe joint.

Therefore, referring again to FIGS. 1 to 3, the valve unit 50 is different from the valveless type pipe joint.
1 shows a first embodiment in the case where an integrated pipe joint with a valve is provided by incorporating a valve.

The valve unit 50 has a short tubular valve seat member 51 and a bottomed tubular valve body 52 slidable within the tubular member. The valve seat member 51 is shown in FIG.
As shown in FIG. 3 and FIG. 3, it is a member that is fixed in position by connecting the fluid pipe 4 after being assembled into the adapter 30. A female screw 32 is formed on the inner periphery of the rear end of the adapter 30, and the distal end of the fluid pipe 4 is screw-connected to the female screw 32. The connected fluid pipe 4 is configured such that a stopper stepped portion 4a having a step formed on the inner periphery of the distal end portion abuts against the rear end 51a of the valve seat member 51, and the valve seat member 51 is abutted against the abutting wall 33 on the adapter 30 side. (Refer to FIG. 1).

As is clear from FIG. 1, the valve seat member 5
Reference numeral 1 denotes a valve seat 51b having a tapered surface at an inner peripheral end, and an O-ring 54 for securing a sealing property with the inner peripheral surface of the fluid pipe 4 is mounted on an outer peripheral surface. An O-ring 55 is mounted on the outer periphery of the valve body 52 on the bottom side.
A communication hole 52a communicating with the inside is provided in a position adjacent to the inside. Further, a flange that locks one end of the spring 53 is provided on the outer periphery close to the opening side.

The valve body 52 constructed by mounting the spring 53 as described above is inserted into the cylinder of the valve seat member 51 from the bottomed side, and is opposed from the end of the valve seat 51b against the urging force of the spring 53. The O-ring 55 is mounted on the outer periphery on the bottomed side in a protruding state. Then, the urging force is released and the spring 53 is released.
As a result, the valve seat member 51 and the valve body 52 are relatively moved, the O-ring 55 is brought into contact with the valve seat 51b to stop the flow of the fluid from the fluid pipe 4 side, and the valve seat member 51 and the valve body 52 Are integrated to form a valve unit 50.

Next, the assembling operation and the operation at the time of use of the integrated pipe joint with a valve according to the first embodiment having the above configuration will be described.

In the layout piping work, first, as shown in FIG. 1, the valve unit 50 is incorporated into the adapter 30 on the socket 2 side. At that time, a washer-shaped elastic packing 17 is mounted in the adapter 30 in advance. The elastic packing 17 may be mounted in advance on the valve seat member 51 side of the valve unit 50.

Subsequently, the valve unit 50 is assembled into the adapter 30 from the rear end, with the valve body 52 at the head. The valve seat member 51 abuts against the elastic packing 17 that is in close contact with the abutment wall 33 in the adapter 30, and is positioned while restricting further forward movement.

After assembling the valve unit, as shown in FIG. 2, the fluid pipe 4 is connected to the rear end of the adapter 30 by screwing. When the fluid pipe 4 is screwed in, the stopper step 4a of the fluid pipe 4 abuts against the rear end 51a of the valve seat member 51 already installed from behind. The valve seat member 51 is
It is sandwiched between the abutment wall 33 of the front adapter 30 and the stopper step 4a of the rear fluid pipe 4 via the elastic packing 17, and is positioned and fixed so that it cannot advance or retreat. At this time, the sealability at the threaded connection between the fluid pipe 4 and the adapter 30 is ensured by the elastic packing 17.

Here, as shown in FIG. 2, in the plug 3, in order to correspond to an integrated pipe joint with a valve,
An annular valve opening piece 3b is previously mounted on the inner periphery of the front end by fitting or the like to prepare for insertion into the socket 2 side. As shown in FIG. 3, the plug 3 is connected to the other fluid pipe 5.
And is inserted into the socket body 20 from the front end 21 in this state. The tapered portion 3c on the outer periphery of the plug 3 contacts the tapered surface 11a of the movable support ring 11 inside the socket body 21. Further, when the plug 3 is inserted, the movable support ring 11 is pushed inward from the steady position against the spring 12. When the movable support ring 11 is pushed in and retracted, the support from the inside with respect to the lock claw 10 is released. Almost synchronously with the release of the support of the lock claw 10, the inside of the lock claw 10 matches the annular lock groove 3a of the plug 3 being inserted.

At this time, since the sleeve 40 is constantly urged in the forward direction by the spring 43, the tapered surface 4 of the annular groove 41 on the sleeve 40 side due to the urging force.
The slope component force of 1 a acts on the lock claw 10. The lock claw 10 is pushed into the hole 22 of the socket body 20 by the force. The sleeve 40 is further synchronized with the pushing of the lock claw 10.
Is advanced by the spring 43, and the inner peripheral restraining surface 41 b of the sleeve 40 moves right above the lock claw 10 and is prevented from moving in the centrifugal direction. From the lock groove 3a. In this manner, the movement of the plug 3 on the joint axis CC along the lock claw 10 is sealed, and the plug 3 is connected to the socket 2 in a locked state.

In FIG. 3, the valve body 52 of the valve unit 40 in the adapter 30 is moved by a spring 53 by a valve opening piece 3b attached to the front of the plug 3.
Retreat against When the valve body 52 retreats with respect to the fixed valve seat member 51, the O-ring 55
It moves away from a and is released from the previous closed state.

By opening the valve body 52, the fluid pipes 4 and 5 on both sides communicate with each other, and the fluid shown by the arrow can flow from the fluid pipe 4 on one side to the fluid pipe 5 on the other side through the communication hole 52a. Become.

On the contrary, the socket 2 and the plug 3 are separated as follows. As shown in FIG. 3, at the time of the above connection,
The C-shaped stopper ring 14 is enlarged in diameter, and the stopper step 14a is protruded.
5 to prevent the sleeve 40 from retreating.

From this state, the stopper ring 14 is pressed and contracted to reduce the diameter. The stopper step 14 a of the stopper ring 14 is formed in the annular groove 24 on the outer periphery of the socket body 20.
When the sleeve 40 is pushed into the annular concave groove 44 on the inner periphery of the sleeve 40, the sleeve 40 can be retracted. By the retreating operation of the sleeve 40, the depressing surface 41 of this inner peripheral surface is
The restraining of the lock claw 10 from above by b is released.
When the lock is released from the lock claw 10, the plug 3 can be removed from the socket body 20 by pushing up the unlocked lock claw 10.

At this time, the movable support ring 11 moves forward by the urging force of the spring 12 to push the lock claw 10 in the centrifugal direction, and engages with the annular concave groove 41 at the front end of the sleeve 40, whereby the sleeve 40 advances. Deter.

As will be understood from the first embodiment, the valve unit 50 can be used as a valveless type pipe joint in a state where the valve unit 50 is not assembled, and the valve unit 50 can be easily assembled as necessary. Thus, it can be used as an integrated pipe joint with a valve.

Next, FIGS. 4 and subsequent figures show second, third and fourth embodiments according to the present invention. In each of these embodiments, as in the first embodiment, by simply mounting the valve unit on a pipe joint having a valve-less type as a basic structure, each can be used as an integrated pipe joint with a valve. it can.

First, in the second embodiment shown in FIGS. 4 and 5, the structure of the members on the socket 2 side is almost the same as the first embodiment, and the plug and the valve unit are modified. Things. Corresponding members have the same reference characters allotted.

In this case, the valve opening piece mounted on the inner periphery of the front end of the plug 3 has a fitting shape 3d shown in FIG.
Alternatively, a structure in which the valve opening piece 3e is screw-connected to the inner periphery of the front end of the plug 3 by a male and female screw as shown in FIG.

The valve unit 60 is basically the same as the valve unit 50 of the first embodiment in terms of the number of members, except that the shape and size of each member are slightly changed. In this case, unlike the first embodiment, the valve seat member 61 is not positioned and fixed by abutment at the time of connection of the fluid pipe 4, and the fluid pipe 4 and the valve seat member 6 are not fixed.
Neither one has a direct relevance.

That is, in the second embodiment, a stop ring 66 is used as a means for positioning the valve unit 60 instead of using the fluid pipe 4. The stop ring 66 is fixed to the inner peripheral surface of the adapter 30 and is in contact with the rear end of the valve seat member 61. For the valve seat member 61 positioned and fixed by the stop ring 66,
As shown in FIG. 5, the valve body 62 of the valve unit 60 in the adapter 30 is retracted against the spring 63 by the valve opening pieces 3 d or 3 e attached to the front part of the plug 3. The valve body 6 with respect to the fixed valve seat member 61
As the 2 retreats, the O-ring 65 moves displaced from the valve seat 61a, and is released from the previously closed state.
When the valve body 62 is opened, the fluid pipes on both sides communicate with each other, and the fluid indicated by the arrow flows from the fluid pipe on one side to the communication hole 62a.
Through to the fluid pipe on the other side. By using the stop ring 66, the valve seat member 61 can be positioned at an arbitrary position in the adapter 30.

FIGS. 6 and 7 show a third embodiment according to the present invention. Also in this case, members corresponding to those in the first embodiment are denoted by the same reference numerals.

In the valve unit 70, a valve seat 71a having a tapered surface is formed on the inner periphery of the front end of a cylindrical valve seat member 71, and a frusto-conical valve element 7 which comes into contact with and separates from the valve seat 71a.
2 mainly. The means for positioning the valve unit 70 in the adapter 30 uses the fluid pipe 4 in the case of the third embodiment. A stopper step 4b is provided at an appropriate position on the inner periphery of the distal end portion of the fluid pipe 4, and the stopper step 4b is abutted against the cylinder rear end 71b of the valve seat member 71 to be positioned and fixed.

The valve body 7 which moves forward and backward inside the valve seat member 71
2, a packing 72a is provided on a truncated conical portion at the tip, and this packing 72a is brought into contact with and separated from the tapered valve seat 71a. The valve body 72 is urged by a spring 73 in the rightward forward direction in the drawing where the packing 72a is in close contact with the valve seat 71a.

In the valve seat member 71, a valve body 72 is supported by a support claw 74 so as to be inserted into the center thereof so as to be able to advance and retreat. Leg 74a extending in three directions of supporting claw 74
Into the inner peripheral surface of the valve seat member 71 and is fixed.

In the case of the third embodiment, the valve opening piece 3f mounted on the inner periphery of the front end of the plug 3 has a tip 3g corresponding to the tip shape of the valve body 72, as shown in FIG. It is formed in a truncated conical shape through which fluid can pass. Therefore, as shown in FIG. 7, when the distal end portion 3 g of the valve opening piece 3 f of the plug 3 is brought into contact with the distal end of the valve body 72 against the valve seat member 71 positioned and fixed by abutting the fluid pipe 4. , The valve element 72 retreats against the spring 73. When the valve body 72 retreats with respect to the valve seat member 71 in the fixed state, the packing 72a moves displaced from the valve seat 71a, and is opened by forming a gap 75 between the two members from the previous closed state. . When the valve body 62 is opened, the fluid pipes on both sides communicate with each other, and the fluid indicated by the arrow passes from the fluid pipe 4 on one side through the cylinder of the valve seat member 71, passes through the valve gap 75, and opens on the plug 3. After passing through 3f, the fluid can flow from the plug 3 to the fluid pipe on the other side.

FIGS. 8 and 9 show a fourth embodiment according to the present invention. Also in this case, the same reference numerals are given to the corresponding members of the first embodiment.

The valve unit 80 has substantially the same structure as the valve unit 70 of the third embodiment.
In this case, as a means for positioning the valve unit 80 in the adapter 30, an annular stop ring 86 having substantially the same shape as that used in the second embodiment is used. That is, the stop ring 86 is connected to the adapter 30
The valve seat member 82 is fixed to a predetermined position in the adapter 30 by being fixed to the inner peripheral surface of the adapter 30 and making contact with the rear end of the valve seat member 81.

In this case, as shown in FIG. 8A, the valve opening piece 3h mounted on the inner periphery of the front end of the plug 3 is the same as the valve opening piece 3f shown in the third embodiment of FIG. The plug 3 may have a basic shape, and may be fitted to the inner periphery of the front end of the plug 3 or the like. FIG.
Like the valve opening piece 3i shown in (b), the plug 3 may be attached to the inner periphery of the front end of the plug 3 with male and female screws.

Therefore, as shown in FIG. 9, the distal end portion of the valve opening piece 3h or 3i of the plug 3 is attached to the valve seat member 81 positioned and fixed by the stop ring 86.
2, the valve body 82 moves backward against the spring 83. When the valve body 82 retreats with respect to the fixed valve seat member 81, the packing 82a
The member 85 is shifted from position a, and is opened when a gap 85 is formed between the two members from the previous closed state. By opening the valve body 82, the fluid pipes on both sides communicate with each other, and the fluid indicated by the arrow passes through the cylinder of the valve seat member 81 from the fluid pipe 4 on one side,
The valve opening piece 3h or 3 on the plug 3 side through the gap 85
Through i, the fluid can flow from the plug 3 to the fluid pipe on the other side.

[0053]

As described above, the pipe joint of the present invention has a basic structure of a valveless type, and a valve unit is provided on a socket side and a valve unit of a valve unit is provided on a plug side as necessary. By simply attaching each of the valve opening pieces for opening the body, it is possible to form an integrated pipe joint with a valve, and since it can be used for both types with and without a valve, it is effective to suppress an increase in variety.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment in which a valve unit is incorporated into a socket side in a pipe joint according to a first embodiment of the present invention.

FIG. 2 is a side cross-sectional view showing a mode in which a plug is inserted and connected to a socket after the valve unit is assembled in the first embodiment.

FIG. 3 is an assembled side sectional view showing a mode of fluid pipe communication by connecting a socket and a plug in the first embodiment.

FIG. 4A is a side cross-sectional view showing a mode in which a plug is inserted and connected to a socket after a valve unit is assembled in a pipe joint according to a second embodiment of the present invention, and FIG.
FIG. 4 is a side sectional view showing an aspect of inserting and connecting another kind of plug.

FIG. 5 is an assembled side sectional view showing a mode of fluid pipe communication by connecting a socket and a plug in a second embodiment.

FIG. 6 is a side cross-sectional view showing a mode in which a plug is inserted and connected to a socket after a valve unit is assembled in a pipe joint according to a third embodiment of the present invention.

FIG. 7 is an assembled side sectional view showing a fluid pipe communication mode by connecting a socket and a plug in a third embodiment.

FIG. 8A is a side cross-sectional view showing a mode in which a plug is inserted and connected to a socket after a valve unit is assembled in a pipe joint according to a fourth embodiment of the present invention, and FIG.
FIG. 4 is a side sectional view showing an aspect of inserting and connecting another kind of plug.

FIG. 9 is an assembled side sectional view showing a mode of fluid pipe communication by coupling a socket and a plug in a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fitting 2 Socket 3 Plug 3a Annular lock groove 3b Valve opening piece 4, 5 Fluid pipe 4a Stopper step which abuts against a valve seat member 10 Lock claw (locker) 11 Movable support ring 12 Spring 14 Stopper ring 15 O-ring 16 Packing 17 Washer-like elastic packing 20 Socket body 22 Hole 23 Sleeve stopper 30 Adapter 33 Butt wall of fluid pipe 40 Sleeve 41 Annular recess 41b Ball suppression surface 50 Valve unit 51 Valve seat member 51b Valve seat 52 Valve body 52a Communication hole 53 spring

Claims (4)

[Claims] 1. A pipe joint comprising a socket and a plug, which are detachably connected by an appropriate locking means, and a fluid can flow through the connection of the socket and the plug, and is movable in an opening and closing direction. A valve unit which has a simple valve body, is inserted from the rear end into the socket as required, and is mounted at a predetermined position, and positioning means for fixing the valve unit at a predetermined position within the socket. The plug can be attached to the tip of the plug, is attached to the tip of the plug corresponding to the attachment of the valve unit to the socket, is inserted into the socket by inserting the plug into the socket, A valve opening piece for pressing a valve body of the valve unit in an opening direction. 2. The method according to claim 1, wherein the positioning unit is a fluid pipe connected to a rear end of the socket after the valve unit is mounted, and a connection-side front end face of the fluid pipe is brought into contact with a rear end of the valve unit. The pipe joint according to claim 1, wherein the pipe joint is fixed at the predetermined position. 3. The positioning means is an annular stop ring that is retrofitted into the socket, and the stop ring abuts on a rear end of the valve unit and is fixed at the predetermined position. Claim 1 characterized by the following:
The pipe joint according to 1. 4. The valve unit, comprising: a valve seat member positioned at a predetermined position in the socket by the positioning means; and a valve opening member abutting when the plug is inserted from a state where the valve unit is closed by a biasing force. And a valve body that operates in a direction to open against the force.
The pipe joint according to 1.