JPS6317914Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は流量低下の因を解消できる低圧用流体
継手に関するものである。[Detailed Description of the Invention] The present invention relates to a low-pressure fluid coupling that can eliminate the cause of a decrease in flow rate.

本考案者は、さきに嵌め合せたときに、ソケツ
トに形成した通孔とプラグに形成した通孔とが相
互に連通し、かつ、ソケツトに設けた施錠部材と
プラグの周方向に形成した施錠溝とが係合する管
継手のソケツトの主体を、可撓性を有する舌片を
プラグ挿入側の端部に軸方向に向けて突設した主
筒部材と、該主筒部材の上記端部側を被う外套体
を以て形成し、また施錠部材を、上記可撓性舌片
を押圧しない状態では、当該舌片によつて遠心方
向に浮上状態を維持して一部がプラグの施錠溝と
係合する態勢をとり、該舌片をその弾性に抗して
押圧すると、施錠溝との上記係合態勢を解く係止
片と該係止片と一体の押釦片を以て形成して、当
該施錠部材を舌片上に懸垂保持し、更にまた、上
記外套体には施錠部材の押釦片側を外套体外周に
突出させる抜窓を形成した管継手のソケツトを提
案し、第1463535号（実開昭51−91324号）として
実用新案登録を受けた。 The present inventor has discovered that when the plugs are fitted together, the through hole formed in the socket and the through hole formed in the plug communicate with each other, and the locking member provided in the socket and the locking member formed in the circumferential direction of the plug connect to each other. The main body of the socket of the pipe joint that engages with the groove is a main cylindrical member having a flexible tongue protruding in the axial direction from the end on the plug insertion side, and the end portion of the main cylindrical member. When the flexible tongue piece is not pressed, the locking member maintains a floating state in the centrifugal direction by the tongue piece, so that a part of the locking member is connected to the locking groove of the plug. The lock is formed by a locking piece that releases the engagement position with the locking groove when the tongue piece is pressed against its elasticity and a push button piece integrated with the locking piece. proposed a socket for a pipe joint in which a member is suspended and held on a tongue piece, and a slot is formed in the mantle to allow one side of the push button of the locking member to protrude to the outer periphery of the mantle; -91324) was registered as a utility model.

しかるに、上記登録新案に係るソケツトと対を
なすプラグには弁体を保有するものとそうでない
ものがあり、弁体を保有するものにあつては、ソ
ケツトとプラグとの結合時に弁体を開かせる機構
が必要で、たとえば実開昭47−26614号公報に記
載されているような考案を採用しようとすれば小
径の管継手では流量が低下する嫌いがあつた。 However, some of the plugs that are paired with the sockets related to the above-mentioned registered model have a valve body and others do not, and for those that have a valve body, it is difficult to open the valve body when the socket and plug are connected. For example, if a device such as that described in Japanese Utility Model Application Publication No. 47-26614 were to be adopted, the flow rate would tend to decrease with small-diameter pipe joints.

以下、図面に示す実施例にもとづいて本考案を
説明する。 Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

第１図はプラグ１０とソケツト３０との分離状
態を示す縦断正面図、第２図は同プラグとソケツ
トの結合施錠状態を示した縦断正面図で、先ず、
プラグ１０は、同図で明かのように先端挿入部１
１、密封環１６、施錠溝１８及びホースなど適宜
の接続部材（図示せず）を結合するための結合部
１４等を以て構成したもので、ソケツト３０に適
合する形状であればよく、実施例ではゴム製の密
封環１６を除き、硬質合成樹脂で形成されてい
る。 FIG. 1 is a longitudinal sectional front view showing the plug 10 and socket 30 in a separated state, and FIG. 2 is a longitudinal sectional front view showing the plug and socket in a combined and locked state.
As shown in the figure, the plug 10 is inserted into the tip insertion portion 1.
1. It is composed of a sealing ring 16, a locking groove 18, a connecting part 14 for connecting an appropriate connecting member (not shown) such as a hose, etc., and may have any shape as long as it fits the socket 30. Except for the rubber sealing ring 16, it is made of hard synthetic resin.

１２はソケツト３０への先端挿入部１１を具え
る前部材１２で、同前部材１２の外周には、前記
密封環１６および施錠溝１８のほかに截頭円錐面
１７が設けられている。 Reference numeral 12 denotes a front member 12 which includes a distal end insertion portion 11 into the socket 30. On the outer periphery of the front member 12, in addition to the sealing ring 16 and locking groove 18, a truncated conical surface 17 is provided.

前部材１２の軸心部を貫通させた流体導孔１９
と結合部１４側の軸心部を貫通させた流体導孔２
０とは、正面部に密封環２２を具えた弁体２３が
ばね２４の弾発力で、弁座２１に当接するように
なつていてプラグ１０がソケツト３０と接続され
ていないときは流体導孔１９，２０が閉塞されて
いる。流体導孔１９には弁体２３の管状脚部２５
を軸方向に摺動自在に嵌合する。当該管状脚部の
前端２５ａは、前部材１２の前端１１ａの近傍に
位置しており、前端２５ａがソケツト側の下記突
起３８で押されると、管状脚体２５はばね２４の
弾発力に抗して弁体２３を押し、該管状脚部２５
一端に肉厚方向に貫通させて穿設した切欠部が流
体通路２６となつて、同切欠部２６より流体が流
体導孔２０に向つて流通するようになつている。 A fluid guide hole 19 passing through the axial center of the front member 12
and a fluid guide hole 2 passing through the shaft center part on the coupling part 14 side.
0 means that the valve body 23, which has a sealing ring 22 on the front side, comes into contact with the valve seat 21 by the elastic force of the spring 24, and when the plug 10 is not connected to the socket 30, the fluid is not conducted. Holes 19 and 20 are closed. The fluid guide hole 19 has a tubular leg portion 25 of the valve body 23.
are slidably fitted in the axial direction. The front end 25a of the tubular leg is located near the front end 11a of the front member 12, and when the front end 25a is pushed by the protrusion 38 on the socket side, the tubular leg 25 resists the elastic force of the spring 24. to push the valve body 23 and press the tubular leg 25.
A notch formed at one end in the thickness direction serves as a fluid passage 26, and fluid flows from the notch 26 toward the fluid guide hole 20.

なお、２７は弁体２３が開いたとき、その後退
位置を規制する停止部で、流体導孔２０の中央部
にブリツジ状に形成されている。 Note that 27 is a stop portion that restricts the retracted position of the valve body 23 when it is opened, and is formed in the shape of a bridge in the center of the fluid guide hole 20.

次に、ソケツト３０は、主筒部材３１の施錠部
材３２と外套体３３の三者がいずれも合成樹脂で
構成されており、主筒部材３１の一端は、ホース
など適宜の接続部材（図示せず）を結合するため
の結合部３５を有し、他の一端には軸方向に貫通
させた流体導孔３９の端部を開口させて当該部に
プラグ挿入開口部Ａを形成し、更に該導孔３９の
他端にはプラグ１０の先端挿入部１１との結合部
３６および突起３８と導孔３９と直交する向きに
上記施錠部材３２の嵌合溝４０を有していて、突
起３８の回りには、同突起３８の外周面とプラグ
挿入開口部Ａの内周面とによつて囲まれた空間Ｂ
を設けて、プラグ１０の先端挿入部１１の内外周
面が、同空間Ｂのプラグ挿入開口部Ａの内周面と
突起３８の外周面とに接するようになつている。 Next, in the socket 30, the locking member 32 of the main cylindrical member 31 and the outer shell 33 are all made of synthetic resin, and one end of the main cylindrical member 31 is connected to a suitable connecting member such as a hose (not shown). The other end has a connecting part 35 for connecting a fluid guide hole 39 which is passed through in the axial direction, and a plug insertion opening A is formed therein. The other end of the guide hole 39 has a fitting groove 40 for the locking member 32 in a direction perpendicular to the connecting part 36 and the protrusion 38 to the tip insertion part 11 of the plug 10 and the guide hole 39. There is a space B surrounded by the outer circumferential surface of the protrusion 38 and the inner circumferential surface of the plug insertion opening A.
are provided so that the inner and outer circumferential surfaces of the tip insertion portion 11 of the plug 10 are in contact with the inner circumferential surface of the plug insertion opening A in the same space B and the outer circumferential surface of the protrusion 38.

突起３８は上記結合部３６の軸心部に流体導孔
３９の前端部に突設した突起で、この突起３８
は、プラグ１０を結合したときにプラグ１０内の
弁体２３の管状脚部２５の前端２５ａを押圧し、
同管状脚部２５を後退させるだけの長さを有して
いる。 The protrusion 38 is a protrusion that protrudes from the front end of the fluid guide hole 39 at the axial center of the coupling portion 36.
presses the front end 25a of the tubular leg 25 of the valve body 23 in the plug 10 when the plug 10 is coupled;
It has a length sufficient to allow the tubular leg portion 25 to retreat.

溝４０には、同じく合成樹脂を以て形成した施
錠部材３２が各図面において上下方向に摺動自在
に嵌合されているが、当該施錠部材３２の外部端
面（各図面において上端面）には押釦片４２を有
し、同施錠部材３２の主要部分はプラグ１０の施
錠溝１８の、第１，２図において下部位と係合す
る係止環４３を以て形成して、押釦片４２と係止
環４３とが一体に形成されている。 A locking member 32 also made of synthetic resin is fitted into the groove 40 so as to be slidable in the vertical direction in each drawing, but the outer end surface (upper end surface in each drawing) of the locking member 32 is fitted with a push button piece. 42, and the main part of the locking member 32 is formed by a locking ring 43 that engages with the lower part of the locking groove 18 of the plug 10 in FIGS. 1 and 2. are integrally formed.

係止環４３は、下記舌片３７によつて懸垂支持
されており、舌片３７に外部から押圧力が加えら
れていない状態においては、その一部（第１，２
図において下部位）が流体導孔３９の中に僅かに
顔をのぞかせている。 The locking ring 43 is suspended and supported by the following tongue piece 37, and when no pressing force is applied to the tongue piece 37 from the outside, part of the locking ring 43 (first, second
The lower portion (in the figure) is slightly peeking into the fluid guide hole 39.

また、主筒部材３１の端部に軸方向に向けて突
設した可撓性舌片３７は、非加圧の状態では第２
図に示すように主筒部材３１の軸心方向に対して
平行状態を維持しているが、同図上方から押圧す
ると、第３図に示すように下方へ撓む弾性体で、
この舌片３７によつて上記係止環４３の頂部すな
わち押釦片４２を支持し、当該施錠部材３２を懸
垂している。 In addition, the flexible tongue piece 37 protruding from the end of the main cylinder member 31 in the axial direction is in the second position when no pressure is applied.
As shown in the figure, it maintains a state parallel to the axial direction of the main cylinder member 31, but when pressed from above in the figure, it is an elastic body that bends downward as shown in Figure 3.
This tongue piece 37 supports the top of the locking ring 43, that is, the push button piece 42, and suspends the locking member 32.

外套体３３には施錠部材３２の押釦片４２を操
作する抜窓４１を設け、押釦片４２に外力を加え
ないときには、押釦片４２の外周面は外套体３３
の外周面より突出しないよう主筒部材３１の端部
に嵌め込まれている。３４は外套体３３の抜止環
である。 The mantle body 33 is provided with a window 41 for operating the push button piece 42 of the locking member 32, and when no external force is applied to the push button piece 42, the outer peripheral surface of the push button piece 42 is closed to the mantle body 33.
It is fitted into the end of the main cylinder member 31 so as not to protrude beyond the outer circumferential surface of the main cylinder member 31. 34 is a retaining ring for the outer mantle 33.

次に本考案の作用を上記実施例によつて説明す
る。 Next, the operation of the present invention will be explained using the above embodiment.

プラグ１０の先端挿入部１１をソケツト３０の
結合部３６内に挿入すると、主筒部材３１の舌片
３７によつて懸垂支持された施錠部材３２は、当
該舌片３７が可撓性を有するため第３図下方に動
くことができ、施錠部材３２の係止環４３は前記
先端挿入部１１の進入を許容し、やがて係止環４
３は先端挿入部１１の施錠溝１８と対向し、この
とき、舌片３７の弾性によつて施錠部材３２は上
昇して、係止環４３と施錠溝１８とが係合し、第
２図に示すように、プラグ１０とソケツト３０は
一体に結合施錠される。 When the distal end insertion portion 11 of the plug 10 is inserted into the coupling portion 36 of the socket 30, the locking member 32 suspended and supported by the tongue piece 37 of the main cylinder member 31 is suspended because the tongue piece 37 is flexible. 3, the locking ring 43 of the locking member 32 allows the tip insertion portion 11 to enter, and eventually the locking ring 43
3 faces the locking groove 18 of the tip insertion portion 11, and at this time, the elasticity of the tongue piece 37 causes the locking member 32 to rise, and the locking ring 43 and the locking groove 18 engage with each other, as shown in FIG. As shown in FIG. 2, the plug 10 and the socket 30 are coupled and locked together.

このようにして、プラグ１０とソケツト３０と
が結合されると、プラグ１０の密封環１６がプラ
グとソケツトとの間の流体密封を行ない、他方で
は、ソケツト３０側の突起３８が弁体２３の管状
脚部２５の前端２５ａに押圧してこれをばね２４
の弾発に抗して退動させるため、弁体２３は弁座
２１から離反し、弁体の管状脚部の流体通路２６
を介してソケツト３０およびプラグ１０の流体導
孔３９，１９，２０は相互に導通する。このと
き、プラグ１０の先端挿入部１１は、ソケツト３
０のプラグ挿入開口部Ａの内周面と突起３８の外
周面とによつて囲まれた空間Ｂに、その内外周面
をいずれも面接触状態に係合して曲げ荷重に対す
る強度を大きくしている。 In this way, when the plug 10 and the socket 30 are connected, the sealing ring 16 of the plug 10 provides a fluid seal between the plug and the socket, while the protrusion 38 on the side of the socket 30 seals the valve body 23. The spring 24 is pressed against the front end 25a of the tubular leg 25.
The valve body 23 is moved away from the valve seat 21 and the fluid passageway 26 of the tubular leg of the valve body is retracted against the rebound.
The fluid inlet holes 39, 19, 20 of the socket 30 and the plug 10 communicate with each other through the socket 30 and the plug 10, respectively. At this time, the tip insertion portion 11 of the plug 10 is inserted into the socket 3.
In the space B surrounded by the inner circumferential surface of the plug insertion opening A and the outer circumferential surface of the protrusion 38, both the inner and outer circumferential surfaces thereof are engaged in surface contact to increase the strength against bending load. ing.

次いで、施錠部材３２の押釦片４２を加圧し、
施錠部材３２の係止環４３を押し下げると、同環
４３の頂部４２を懸垂支持している可撓性舌片３
７は第３図に示すように下向きに撓み、このと
き、施錠部材３２はプラグ１０の施錠溝１８への
係合を解除するようになるから、その状態のまゝ
プラグを第３図右方向に引けばプラグ１０はソケ
ツト３０から容易に引き抜くことができる。 Next, pressurize the push button piece 42 of the locking member 32,
When the locking ring 43 of the locking member 32 is pushed down, the flexible tongue piece 3 suspending and supporting the top part 42 of the ring 43
7 is bent downward as shown in FIG. 3, and at this time, the locking member 32 releases the engagement with the locking groove 18 of the plug 10. The plug 10 can be easily pulled out from the socket 30 by pulling it.

プラグ１０とソケツト３０とが分離されると、
プラグ１０内に設けた弁体２３に作用するばね２
４は、当該弁体２３を前方に向けて押し出し、弁
体２３は流体導孔１９，２０を遮閉する。 When the plug 10 and socket 30 are separated,
Spring 2 acting on valve body 23 provided within plug 10
4 pushes the valve body 23 forward, and the valve body 23 blocks the fluid guide holes 19 and 20.

以上、実施例について説明したが、本考案の管
継手は軸方向に貫通させた流体導孔３９と連通す
るプラグ挿入開口部Ａの中心部に、同開口部の開
口端方向に端面を向けて突起３８を設けたソケツ
ト３０と、ばね２４によつて付勢されて流体導孔
２０内で軸方向に摺動する弁体２３を有し、か
つ、ソケツト３０との接続時に、当該弁体２３が
前記突起３８の押圧力を受けて前記ばね２４の弾
発力に抗して流体導孔２０を開くプラグ１０とか
らなり、このソケツト３０とプラグ１０を両者の
接続時に係止し合う施錠機構３２，１８を設けた
管継手に於いて、ソケツト３０に設けた前記突起
３８を管体を以て形成すると共に、同突起の外周
に、プラグの先端挿入部１１の進入を許容し、当
該挿入部の内外周面を前記プラグ挿入開口部Ａの
内周面と当該突起３８の外周面に接触させる空間
Ｂを形成し、また、プラグ１０に設けた前記弁体
２３にはソケツト接続端（前端）１１ａ方向に延
在させてプラグ１０の先端挿入部１１の内周面に
接して弁体２３と一体に摺動する管状脚部２５を
形成すると共に、前記突起３８の長さをソケツト
３０とプラグ１０の接続時に、当該突起３８の端
面がプラグ１０側の管状脚部２５の端面を押圧す
る寸法に設定し、かつ、該管状脚部２５の弁体２
３寄りには、流体通路２６を同脚部２５の肉厚方
向に貫通させて穿設し、更に、ソケツト３０とプ
ラグ１０との接続時に、ソケツト３０側の前記突
起３８の内周面とプラグ１０側の管状脚部２５の
内周面とが同一面となるように突起３８と管状脚
部２５の内径を同一径に形成したものであるか
ら、ソケツト側の流体通路とプラグ側の流体通路
の流体抵抗はきわめて小さくなり、しかも、ソケ
ツト側の突起とプラグ側に設けた弁体の管状脚部
とを同一内径としたことにより、流量低下の因を
解消し、小径管継手であつても、従来のものより
大量の流体を流すことができる。 Although the embodiments have been described above, the pipe joint of the present invention has an end face facing the center of the plug insertion opening A that communicates with the fluid guide hole 39 penetrated in the axial direction, and toward the opening end of the opening. It has a socket 30 provided with a protrusion 38 and a valve body 23 that is biased by a spring 24 and slides in the axial direction within the fluid guide hole 20, and when connected to the socket 30, the valve body 23 and a plug 10 which opens the fluid guide hole 20 under the pressure of the protrusion 38 and against the elastic force of the spring 24, and a locking mechanism that locks the socket 30 and the plug 10 together when they are connected. 32, 18, the protrusion 38 provided on the socket 30 is formed of a tube body, and the tip insertion portion 11 of the plug is allowed to enter into the outer periphery of the protrusion. A space B is formed in which the inner and outer circumferential surfaces are brought into contact with the inner circumferential surface of the plug insertion opening A and the outer circumferential surface of the protrusion 38, and the valve body 23 provided on the plug 10 has a socket connection end (front end) 11a. A tubular leg portion 25 is formed which extends in the direction of the plug 10 and slides integrally with the valve body 23 in contact with the inner circumferential surface of the distal end insertion portion 11 of the plug 10. The end face of the protrusion 38 is set to a size that presses the end face of the tubular leg 25 on the plug 10 side when the valve body 2 of the tubular leg 25 is connected.
On the third side, a fluid passage 26 is bored through the leg portion 25 in the thickness direction, and when the socket 30 and the plug 10 are connected, the inner circumferential surface of the protrusion 38 on the socket 30 side and the plug Since the inner diameter of the protrusion 38 and the tubular leg 25 are formed to be the same so that the inner peripheral surface of the tubular leg 25 on the 10 side is flush with the inner circumferential surface of the tubular leg 25 on the 10 side, the fluid passage on the socket side and the fluid passage on the plug side are the same. The fluid resistance of the valve is extremely small, and by making the protrusion on the socket side and the tubular leg of the valve body on the plug side the same inner diameter, the cause of flow reduction is eliminated, and even with small diameter pipe fittings. , it is possible to flow a larger amount of fluid than the conventional one.

また、斯る構造によつて、プラグとソケツト
は、接続時において、内外二重嵌合状態に接続さ
れるようになるから、接続強度、特に曲げ荷重に
対する抗力を著しく向上させることができるとい
う特長がある。 In addition, with this structure, the plug and socket are connected in a double-fitting state between the inside and outside when connected, so the connection strength, especially the resistance against bending load, can be significantly improved. There is.

このように本考案はソケツトとプラグとの二重
嵌合機構および弁体開閉機構の構造がきわめて簡
単で、生産が容易であるから、管継手のコストを
著しく引き下げることができる。 As described above, in the present invention, the structure of the socket-plug double fitting mechanism and the valve body opening/closing mechanism is extremely simple, and production is easy, so that the cost of the pipe joint can be significantly reduced.

なお、上記実施例はこの考案の１例を示したに
すぎないもので、本考案の主旨を逸脱しない範囲
の類似する種々の態様を採り得ることはいうまで
もない。 It should be noted that the above embodiment is merely an example of the present invention, and it goes without saying that various similar embodiments may be adopted without departing from the gist of the present invention.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本考案の１実施例を示したもので、第１
図はプラグとソケツトとの分離状態を示す縦断正
面図、第２図はプラグとソケツトの接続状態を示
す縦断正面図、第３図は半接続状態のプラグとソ
ケツトを示す縦断正面図、第４図は第１図Ａ−Ａ
線切断矢示方向側面図である。 １０……プラグ、１１……先端挿入部、１２…
…前部材、１８……施錠溝、１９，２０……流体
導孔、２３……弁体、２４……ばね、２５……管
状脚部、２６……流体通路、３０……ソケツト、
３１……主筒部材、３２……施錠部材、３７……
可撓性舌片、３３……外套体、３８……突起、３
９……流体導孔、４１……抜窓、４２……押釦
片、４３……係止環、Ａ……プラグ挿入開口部、
Ｂ……空間。 The drawing shows one embodiment of the present invention.
Figure 2 is a longitudinal sectional front view showing the separated state of the plug and socket, Fig. 2 is a longitudinal sectional front view showing the connected state of the plug and socket, Fig. 3 is a longitudinal sectional front view showing the plug and socket in a semi-connected state, and Fig. 4 is a longitudinal sectional front view showing the plug and socket in a semi-connected state. The figure is Figure 1 A-A.
FIG. 10...Plug, 11...Tip insertion part, 12...
... Front member, 18 ... Locking groove, 19, 20 ... Fluid guide hole, 23 ... Valve body, 24 ... Spring, 25 ... Tubular leg, 26 ... Fluid passage, 30 ... Socket,
31... Main cylinder member, 32... Locking member, 37...
Flexible tongue piece, 33... Mantle body, 38... Protrusion, 3
9... Fluid guide hole, 41... Window, 42... Push button piece, 43... Locking ring, A... Plug insertion opening,
B... Space.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 軸方向に貫通させた流体導孔と連通するプラグ
挿入開口部の中心部に、同開口部の開口端方向に
端面を向けて突起を設けたソケツトと、ばねによ
つて付勢されて流体導孔内で軸方向に摺動する弁
体を有し、かつ、ソケツトとの接続時に、当該弁
体が前記突起の押圧力を受けて前記ばねの弾発力
に抗して流体導孔を開くプラグとからなり、この
ソケツトとプラグに、両者の接続時に係止し合う
施錠機構を設けた管継手に於いて、ソケツトに設
けた前記突起を管体を以て形成すると共に、同突
起の外周に、プラグの先端挿入部の進入を許容
し、当該挿入部の内外周面を前記プラグ挿入開口
部の内周面と当該突起の外周面に接触させる空間
を形成し、また、プラグに設けた前記弁体にはソ
ケツト接続端（前端）方向に延在させてプラグの
先端挿入部の内周面に接して弁体と一体に摺動す
る管状脚部を形成すると共に、前記突起の長さを
ソケツトとプラグの接続時に、当該突起の端面が
プラグ側の管状脚部の端面を押圧する寸法に設定
し、かつ、該管状脚部の弁体寄りには、流体通路
を同脚部の肉厚方向に貫通させて穿設し、更に、
ソケツトとプラグの接続時に、ソケツト側の前記
突起の内周面とプラグ側の管状脚部の内周面とが
同一面となるように突起と管状脚部の内径を同一
径に形成した管継手。 A socket is provided in the center of the plug insertion opening that communicates with the fluid guide hole penetrated in the axial direction, and a protrusion is provided with the end surface facing toward the opening end of the opening, and the socket is biased by a spring to guide the fluid. It has a valve body that slides in the axial direction within the hole, and when connected to the socket, the valve body receives the pressing force of the projection and opens the fluid guide hole against the elastic force of the spring. In a pipe joint in which the socket and plug are provided with a locking mechanism that locks them together when they are connected, the protrusion provided on the socket is formed with a tube body, and the outer periphery of the protrusion is A space is formed that allows the insertion of the distal end insertion portion of the plug and brings the inner and outer circumferential surfaces of the insertion portion into contact with the inner circumferential surface of the plug insertion opening and the outer circumferential surface of the protrusion, and the valve provided on the plug. The body is formed with a tubular leg that extends toward the socket connection end (front end) and slides integrally with the valve body in contact with the inner peripheral surface of the tip insertion portion of the plug. When the plug is connected to the plug, the end face of the protrusion is dimensioned to press against the end face of the tubular leg on the plug side, and the fluid passage is set in the direction of the wall thickness of the leg near the valve body of the tubular leg. The hole is drilled through the hole, and further,
A pipe joint in which the inner diameters of the protrusion and the tubular leg are formed to be the same diameter so that when the socket and plug are connected, the inner circumferential surface of the protrusion on the socket side and the inner circumferential surface of the tubular leg on the plug side are flush with each other. .