JP5854907B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a female joint for detachably connecting a male joint.

  FIG. 10 shows one type of conventional pipe joint. In the pipe joint, the female joint 1 is provided with a ball valve 2, and the male valve 4 is inserted into the through hole 3 with the ball valve 2 in a state where the through hole 3 is inclined, and the seal ring 5. After the sliding engagement, the male joint 4 is coaxially aligned with the female joint 1 while rotating the ball valve 2 to connect the two joints. Yes. When the male joint 4 is removed from the female joint 1, the male joint 4 is rotated in the direction opposite to that at the time of connection. (For example, see Patent Document 1)

  In this pipe joint, a resin cylindrical seal member 8 set in the through hole 7 of the joint body 6 of the female joint 1 is hermetically engaged with the ball valve 2, and the joint body 6, the ball valve 2, A seal between the two is formed.

JP 2002-168387 A

  In the conventional pipe joint of this type, when the male joint is rotated from the connected state to the detachable state, the sealing engagement by the cylindrical seal member is released at a certain point, and the male joint is released. The through hole communicates directly with the outside. At this time, if a pressurized fluid is present inside the flow path of the joint, the pressurized fluid is expelled to the outside at a stretch, and there is a possibility that a large noise is generated. Further, in such a pipe joint, when the flow path inner diameter of the joint is small, the through-hole of the female joint is closed by the outer surface of the ball valve, for example, by enlarging the seal surface of the seal member. By letting the through hole of the male joint communicate with the outside of the pipe joint, it is possible to eliminate release of internal fluid from the through hole on the female joint side to the outside. However, there is a limit to the size of the seal surface of the seal member set around the ball valve. If the inner diameter of the through hole of the joint is increased in order to increase the flow rate of the fluid that can flow in the joint, the ball Until the outer surface of the valve closes the through hole of the female joint, it is structurally impossible to continue sealing the through hole of the male joint that is inclined and turned sideways by the seal member. Then, when the through hole of the male joint is removed from the sealing surface, the through hole of the female joint is also in direct communication with the outside, and fluid is suddenly discharged from the female joint side, so that no internal fluid is required. There was also a risk of undue release.

  In view of the above problems, the present invention provides a male joint in which the pressurized fluid inside the joint is gradually released in the process of removing the male joint so that noise can be reduced. For the purpose. Another object of the present invention is to reduce unnecessary discharge of fluid in the joint flow path by reducing the state in which the through hole on the female joint side is in direct communication with the outside.

That is, the present invention
A female joint for detachably connecting a male joint,
A cylindrical joint body having a first through hole penetrating in a longitudinal direction from one end to the other end, and having a conduit connected to the one end;
An annular seal member that is coaxial with the first through hole and is sealingly engaged with the other end of the joint body;
An annular purge suppression member provided on the other end of the joint body coaxially with the annular seal member on the radially outer side of the annular seal member;
A ball valve having a spherical outer surface slidably engaged with the annular seal member and the purge suppressing member, and a second through-hole passing through the outer surface in a diametrical direction; A ball valve in which the male joint is inserted into the two through holes so that the third through hole of the male joint and the second through hole communicate with each other;
A casing member set around the ball valve and fixed to the joint body, wherein the ball valve is sealed to the other end side of the first through hole by the outer surface. A second rotation in which the annular seal member is in sealing engagement with the outer surface around the second through hole by aligning and communicating with the moving position and the second through hole in alignment with the first through hole; A casing member that holds the ball valve so as to be rotatable about a rotation center axis passing through the center of the ball valve between
A restriction flow path is formed at least at a part between the purge suppression member and the ball valve, and the ball valve rotates from the second rotation position to the first rotation position. In the process of being moved, the sealing engagement between the annular seal member and the outer surface is at least partially released, and the second through hole communicates with the outside through the restriction flow path, and the ball valve When the first through-rotation position is reached, the second through hole is at least partially detached from the purge suppressing member and communicates with the outside without passing through the restriction flow path. provide.

  In this female joint, since the restriction flow path is formed between the ball valve and the purge suppressing member, the joint is in the process of turning the ball valve from the second turning position to the first turning position. When the sealing engagement between the main body and the ball valve is partially released, the second through hole of the ball valve communicates with the outside through the restriction flow path, so that the fluid inside the male joint gradually flows to the outside. Will be released. As a result, the fluid pressure inside the male joint is reduced, so that the second through hole of the ball valve is at least partially detached from the purge suppressing member, and the second through hole communicates with the outside without passing through the restriction flow path. Since the discharge speed of the internal fluid at the time of being released can be suppressed to a low level, it is possible to suppress the noise level at the time of fluid discharge. The first through hole of the female joint is not sealed by the outer surface of the ball valve when the sealing engagement between the joint body of the female joint and the ball valve is partially released. Even if it exists, since the 1st penetration hole will be connected with the exterior via a restriction channel, it becomes possible to reduce the amount of discharge of the internal fluid by the side of a female joint.

  Specifically, a recess is provided on the outer surface, and a minute gap is formed by the recess between the purge suppressing member and the ball valve, and the minute gap is formed by the restriction channel. It can be made to constitute at least a part of.

  More specifically, the ball valve includes a valve body having a spherical outer surface, and extends from the valve body to the outside of the casing member along the rotation center axis and rotates together with the valve body. And a shaft mounting portion that is formed to be recessed in the outer surface, and the shaft portion is provided at a proximal end portion of the shaft portion. The engaging portion is engaged with the shaft attaching portion and attached to the valve body, and the shaft attaching portion can also serve as the minute gap.

  With such a structure, the assembly of the ball valve into the casing member is facilitated, and a processing operation only for providing a recess in the ball valve is not required, and the manufacturing process can be shortened.

  The purge suppressing member has a lip portion that partially engages with the outer surface of the ball valve, and the lip portion forms a gap with the outer surface, and the gap is the restriction. At least a part of the flow path can be configured.

  Preferably, the casing member may have a purge release port communicating with the second through hole when the ball valve is in the first rotation position.

  By having the purge release port, it becomes possible to smoothly discharge the internal fluid on the male joint side.

  More preferably, the annular seal member can be made of a rubber material, and the purge suppression member can be made of a resin material harder than the rubber material of the annular seal member.

  By making the annular seal member a rubber material, it is possible to sufficiently ensure the sealing performance between the joint body and the ball valve. Further, by using a resin material as the purge suppressing member, it is possible to reduce the sliding resistance with the ball valve and to smoothly rotate the ball valve.

The present invention also provides:
Any of the female joints described above;
And a male joint that is inserted and connected to the second through hole of the ball valve of the female joint.

  Hereinafter, an embodiment of a female joint according to the present invention will be described with reference to the accompanying drawings.

It is side surface sectional drawing of the state in which the male type joint of the female type joint which concerns on this invention was connected. It is a disassembled perspective view of the female type joint which concerns on this invention. It is side surface sectional drawing of the female type | mold joint which concerns on this invention of the state which made the male type | mold joint removable. It is side surface sectional drawing of the female coupling which concerns on this invention of the state which rotated the male coupling from the state of FIG. 3A. It is side surface sectional drawing of the female type | mold joint which concerns on this invention of the state which rotated the male type | mold joint from the state of FIG. 3B. It is side surface sectional drawing of the female coupling which concerns on this invention of the state which rotated the male coupling from the state of FIG. 3C. It is side surface sectional drawing of the female coupling which concerns on this invention of the state which rotated the male coupling from the state of FIG. 3D, and connected the male coupling. It is side surface sectional drawing of a casing member. It is a perspective view of the female joint in a detachable state and a male joint. It is a perspective view of the female joint in a connected state, and a male joint. FIG. 5 is a perspective view of a female joint and a male joint in which the ball valve is in a rotation-prevented state in the connected state. It is a perspective view of a purge valve and a ball valve in the 1st rotation position. It is a side view of the purge suppression member and ball valve of FIG. 8A. It is a perspective view of a purge valve and a ball valve in the 2nd rotation position. FIG. 9B is a side view of the purge suppressing member and ball valve of FIG. 9A. It is a figure which shows the conventional pipe joint.

  As shown in FIGS. 1 and 2, the female joint 10 according to the present invention includes a joint body 12, a ball valve 14, and a casing member 16 that holds the ball valve 14. The joint body 12 is provided with a first through hole 22 penetrating in a longitudinal direction from one end 18 to the other end 20, and an outer peripheral surface of the one end 18 is connected to a conduit connected to a fluid supply source. A male screw portion 24 is provided. On the inner peripheral surface of the other end 20, an annular seal member 26 for sealingly engaging with the ball valve 14 is disposed coaxially with the first through hole 22. An annular purge suppression member 28 is disposed on the radially outer side of the annular seal member 26 so as to contact the end surface of the other end 20 of the joint body 12. The annular seal member 26 and the purge suppression member 28 are held in the casing member 16 together with the ball valve 14 disposed so as to be engaged with the annular seal member 26 and the purge suppression member 28. The ball valve 14 has a spherical outer surface 30, a second through hole 32 that passes through the outer surface 30 in a diametrical direction, and a diameter orthogonal to the second through hole 32 on the outer surface 30. A valve main body 36 having two shaft mounting portions 34 provided, an annular end face seal member 40 disposed in an annular step portion 38 provided in the second through hole 32, and a second through hole of the valve main body 36. 32, the seal member holding member 42 that engages with the outer peripheral portion of the end face of the end face seal member 40 and presses and holds the end face seal member 40 on the annular step portion 38, and the two shaft mounting portions 34 are engaged and held. The two shaft portions 44 are formed. The second through-hole 32 is configured to receive the male joint 62 such that the front end face 68 is in sealing engagement with the end face of the end face seal member 40.

  The shaft attachment portion 34 is formed by being recessed in the spherical outer surface 30 of the valve body 36, and is provided with a central flat portion 34-1 and on both sides thereof so as to extend in parallel with the second through hole 32. And 34-2. The central flat portion 34-1 extends from one end of the valve main body 36 to the end wall 34-3 that is recessed in a planar shape parallel to the second through-hole 32 so that the spherical outer surface 30 remains. It extends. Here, “concave” means to make a recess from the spherical outer surface 30 in the radial direction, and includes not only making a groove but also chamfering in a planar shape. The shaft portion 44 has a substantially circular flange 50 at the base end portion thereof, and the engaging portion 50-1 fitted to the central flat portion 34-1 of the shaft mounting portion 34 is provided at the end surface thereof. And a pair of engaging protrusions 50-2 that extend in parallel with the second through hole 32 and engage with the stepped portion 34-2 of the shaft mounting portion 34 are left on both sides thereof, A locking projection 50-3 is left at one axial end of the engaging portion 50-1. The engaging portion 50-1 is also engaged with an engaging rib 48 provided at one end periphery of the seal member holding member 42, and the locking protrusion 50-3 locks the engaging rib 48 to hold the sealing member. The member 42 is held so as not to move in the insertion direction.

  In the ball valve 14, the shaft portion 44 is rotatably supported by the shaft engaging hole 52 of the casing member 16, and a rotation center axis 56 passing through the two shaft portions 44 between the joint body 12 and the casing member 16 is provided. It can be rotated around. On the outer periphery of the casing member 16, a sleeve 58 and a spring 60 for urging the sleeve 58 in a direction to engage with the shaft portion 44 in order to prevent rotation of the ball valve 14 described in detail later. Is provided.

  When assembling the ball valve 14 in the present embodiment, first, the two shaft portions 44 are respectively arranged from the inside of the casing member 16 so as to pass through the respective shaft engagement holes 52, and the end face seal member 40 and the seal member are arranged. The holding member 42 is inserted and disposed in the second through hole 32. The valve main body 36 in such a state is engaged with the end face seal member 40 and the seal member holding member 42 so that the central flat portion 34-1 of the shaft attachment portion 34 is engaged in the engagement portion 50-1. It is inserted into the casing member 16. At this time, the engaging rib 48 of the seal member holding member 42 is locked by the locking protrusion 50-3 of the shaft portion 44. Subsequently, the joint body 12 to which the annular seal member 26 and the purge suppressing member 28 are attached is screw-engaged with the casing member 16, and the annular seal member 26 is sealingly engaged with the spherical outer surface 30 of the valve body 36. Attach as shown. At this time, a gap is formed between the spherical inner surface 54 of the purge suppressing member 28 and the spherical outer surface 30 of the valve body 36 without contact. This simple assembly is possible because the shaft portion 44 is a separate member.

  In order to connect the male joint 62 to the female joint 10, first, as shown in FIG. 3A, the direction of the second through hole 32 of the ball valve 14 is about 60 degrees with respect to the longitudinal direction of the joint body 12. When the ball valve 14 is positioned at the first rotation position where the ball valve 14 is located, that is, in a detachable state, the male joint 62 is inserted into the second through hole 32 of the ball valve 14 through the insertion port 64 of the casing member 16. Insert into. At this time, the outer peripheral surface of the distal end portion of the male joint 62 is in contact with the inner peripheral surface of the seal member holding member 42 inserted into the male joint insertion portion 66 of the second through-hole 32, and the front end surface 68 is the end surface seal member. 40. The other end 20 side of the first through hole 22 of the joint body 12 is sealed by the outer surface 30 of the ball valve 14 and the annular seal member 26, so that the fluid in the first through hole 22 does not leak to the outside. Yes. Next, when the male joint 62 is rotated in the direction of arrow A in FIG. 3B, the concave engagement portion 70 provided on the outer peripheral surface of the male joint 62 defines the slot opening 72 of the casing member 16. It engages with engaging edges 74 provided on the edges on both sides. Further, when the male joint 62 is rotated so that the ball valve 14 rotates to the second rotation position where the second through hole 32 is aligned with the first through hole 22 in the longitudinal direction, as shown in FIG. The mold joint 10 and the male joint 62 are connected to each other, and the other end 20 of the joint body 12 and the outer surface 30 of the ball valve 14 are sealed and engaged with the annular seal member 26. The communication part 67 of the 2 through-hole 32 communicates. In addition, the front end surface 68 of the male joint 62 and the annular stepped portion 38 of the ball valve 14 are in sealing engagement with the end surface seal member 40, as will be described later. The three through holes 76 are in communication with each other. That is, in the connected state, the first, second, and third through holes 22, 32, and 76 communicate with each other, and the through holes are sealed to the outside by the two seal members 26 and 40. .

  Next, the sealing engagement by the end surface sealing member 40 between the front end surface 68 of the male joint 62 and the annular step portion 38 of the ball valve 14 will be described. For hermetically engaging, the end face seal member 40 needs to be pressed between the front end face 68 and the annular step portion 38 to be crushed to some extent and brought into close contact with the front end face 68 and the annular step portion 38. This is done by rotating the male joint 62 from the attachable / detachable state to the connected state by the structure shown below. The male joint 62 rotates from the detachable state (FIG. 3A) to the connected state (FIG. 3E) while the engaging portion 70 is slidingly engaged with the engaging edge 74 of the slot opening 72 of the casing member 16. It comes to move. When the engagement edge portion 74 is viewed from the side cross-sectional view shown in FIG. 4, the portion from the boundary portion 78 to the insertion port 64 to the position 82 where the longitudinal axis 80 intersects the drawing portion is the arcuate curved portion 84. The curved portion 84 has such a curvature that the center 57 of the arc is located farther (on the left side in the drawing) on the longitudinal axis than the rotation center axis 56 of the ball valve 14. That is, the center of rotation from the position 82 where the engagement portion 70 of the male joint 62 engages in the connected state is greater than the distance L1 from the boundary portion 78 of the engagement edge 74 to the insertion port 64 to the rotation center axis 56. The distance L2 to the axis 56 is shorter. Therefore, as the male joint 62 is rotated from the attachable / detachable state to the connected state, the engaging portion 70 of the male joint 62 engaged with the engaging edge portion 74 is moved to the rotation center axis 56 of the ball valve 14. As a result, the front end face 68 of the male joint 62 gradually presses the end face seal member 40. Therefore, the rotation of the male joint 62 between the front end surface 68 of the male joint 62 and the annular step portion 38 of the ball valve 14 is performed without rotating the male joint 62 toward the end face seal member 40. A sealing engagement is possible. In this embodiment, the engagement edge 74 has an arcuate curve, but the curve does not necessarily have an arcuate shape.

  The ball valve 14 in the second rotation position is prevented from rotating as follows. As shown in FIGS. 8A, 8B, 9A and 9B, the shaft portion 44 of the ball valve 14 has two straight lines 86-1 extending inward from the outer periphery of the shaft portion 44 and intersecting at right angles, and the outer periphery of the shaft portion. And a notch 86 having a fan-shaped cross section with a central angle of 90 degrees with a point on the rotation center axis or the vicinity thereof as a vertex. As can be seen from FIG. 2, an engagement groove 88 extending in the sliding direction of the sleeve 58 is provided on the inner peripheral surface of the circular sleeve 58. In the detachable state shown in FIG. 5, the front end surface 59 of the sleeve 58 is in contact with the arcuate outer peripheral surface of the shaft portion 44, so that the rotation of the ball valve 14 is not limited. On the other hand, in the coupled state shown in FIG. 6, the notch portion 86 of the shaft portion 44 and the engagement groove 88 of the sleeve 58 can be engaged with each other, and the spring 60 is biased toward the shaft portion 44. The sleeve 58 is advanced until the front end surface 59 of the sleeve 58 is engaged with the notch 86 of the shaft portion 44, and is in a state of preventing rotation shown in FIG. In this rotation prevention state, the notch portion 86 of the shaft portion 44 is engaged with the engagement groove 88 of the sleeve 58, so that the ball valve 14 is prevented from rotating, and thus the male joint 62 rotates erroneously. This prevents the female joint 10 from coming off. When it is desired to rotate the ball valve 14, the sleeve 58 is retracted toward the joint body 12, and the engagement between the notch portion 86 of the shaft portion 44 and the engagement groove 88 of the sleeve 58 is released. 62 is rotated.

  In order to remove the connected male joint 62 from the female joint 10, the male joint 62 is rotated from the connected state shown in FIG. 3E to the detachable state shown in FIG. . At this time, in the female joint 10 according to the present invention, as described below, the pressurized fluid existing inside the joint is gradually discharged to the outside.

  As shown in FIGS. 8A, 8B, 9A, and 9B, the purge suppression member 28 has an annular lip portion 92 that engages along the outer surface 30 of the ball valve 14. As described above, the shaft mounting portions 34 are provided on the spherical outer surface 30 of the valve main body 36, and the stepped portions 34 recessed in the outer surface 30 are provided on both sides of each shaft mounting portion 34. -2 is formed, so that a total of four stepped portions 34-2 are formed. When the ball valve 14 shown in FIGS. 8A and 8B is in the first rotation position, the lip portion 92 is disposed so as to pass over two of the four stepped portions 34-2, as shown in FIGS. 9A and 9B. When the ball valve 14 is in the second rotation position, the ball valve 14 is arranged so as to pass over all four stepped portions 34-2. That is, the lip portion 92 of the purge suppression member 28 has four stepped portions 34-2 formed on the ball valve 14 when the ball valve 14 is between the first rotation position and the second rotation position. And a minute gap 96 is always formed between the lip portion 92 and the ball valve 14.

  When the male joint 62 is rotated in the direction of arrow B from the connected state shown in FIG. 3E to the state shown in FIG. 3C, the sealing engagement between the annular seal member 26 and the outer surface 30 of the ball valve 14 is partially performed. It becomes a released state. The lip portion 92 of the purge suppressing member 28 maintains a state of being engaged with the outer surface 30 of the ball valve 14, but the outer surface of the ball valve 14 is between the lip portion 92 and the ball valve 14 as described above. Since the minute gap 96 is formed by the stepped portion 34-2 provided in the recess 30, the pressurized fluid inside the joint is gradually discharged to the outside through the minute gap 96. Further, the lip portion 92 and the outer surface 30 of the ball valve 14 are engaged but not sealed, and a gap is formed. Therefore, the pressurized fluid is discharged not only from the minute gap 96 but also from the gap between the lip portion 92 and the outer surface 30 of the ball valve 14. When the male joint 62 is further rotated to reach the state shown in FIG. 3B to FIG. 3A, the engagement between the lip portion 92 and the ball valve 14 is also partially released. In this state, the purge release port 98 is directly communicated without passing through 96. In this state, the fluid in the second through hole 32 and the third through hole 76 is directly discharged to the outside from the purge release port 98, but a certain amount of fluid has already been discharged through the micro gap 96, and the fluid pressure has decreased. As a result, the rate of release is reduced.

  As described above, the female joint 10 according to the present invention is from when the sealing engagement between the joint body 12 and the ball valve 14 is partially released until the flow path on the male joint 62 side is opened to the atmosphere. In the process, the internal fluid is gradually discharged at a relatively small flow rate by the restriction channel formed by the minute gap 96. As a result, the internal fluid pressure can be gradually reduced, so that it is possible to prevent high-pressure fluid from being released to the atmosphere at once, and to greatly reduce noise during fluid discharge. In addition, it is possible to reduce the risk of the joint being skipped due to sudden fluid discharge. Further, when the lip portion 92 is not provided, the first through hole 22 of the joint body 12 passes through the restriction channel at a relatively early stage when the male joint 62 is rotated from the connected state to the detachable state. Since there is no direct communication with the purge release port 98, a large amount of fluid on the first through-hole 22 side (fluid supply source side) may be released into the atmosphere. However, the presence of the lip portion 92 makes it possible to reduce the amount of discharge and contributes to energy saving.

  In the present embodiment, a rubber material is employed as a material for the annular seal member 26 and the end surface seal member 40 in order to obtain high sealing performance, and a high slidability with the ball valve 14 is obtained as a material for the purge suppression member 28. Therefore, a resin material that is harder and has a lower friction characteristic than the rubber material of the seal members 26 and 40 is employed.

  In the present embodiment, a minute gap 96 as a restriction channel is formed between the stepped portion 34-2 formed by the shaft mounting portion 34 of the valve body 36 and the lip portion 92 of the purge suppressing member 28. However, for example, a minute gap may be formed by providing another groove at a different position on the outer surface 30 of the valve body 36, or a recess may be provided on the lip portion 92 side to provide a space between the ball valve and the ball valve 36. Alternatively, a minute gap may be formed. In addition, the ball valve and the purge suppression member are not provided with a recess, but an appropriate clearance is formed between the lip portion 92 of the purge suppression member 28 and the outer surface 30 of the ball valve 14. May be a restricted flow path.

  In the present embodiment, the first and second through holes 22 and 32 have a relatively large diameter so that a large flow rate can flow, whereby the first through hole 22 passes through the restriction channel in the state of FIG. 3B. However, the first and second through-holes 22 and 32 are reduced in diameter, for example, before the purge suppression member 28 is disengaged. 22 is sealed by the outer surface 30 of the ball valve 14 so that the first through hole 22 does not communicate with the purge release port 98 without passing through the restriction flow path, and the first through hole 22 side. It is also possible to further reduce the amount released from the.

DESCRIPTION OF SYMBOLS 10 Female joint 12 Joint main body 14 Ball valve 16 Casing member 18 One end 20 Other end 22 1st through-hole 24 Male thread part 26 Annular seal member 28 Purge suppression member 30 Outer surface 32 2nd through-hole 34 Shaft attaching part 34-1 Center Plane portion 34-2 Stepped portion 34-3 End wall 36 Valve body 38 Annular step portion 40 End surface seal member 42 Seal member holding member 44 Shaft portion 46 Front end surface 48 Engaging rib 50 Flange 50-1 Engaging portion 50-2 Engagement projection 50-3 Engagement projection 52 Shaft engagement hole 54 Inner surface 56 Center of rotation axis 57 Center of arc 58 Sleeve 59 Front end surface 60 Spring 62 Male joint 64 Insert port 66 Male joint insertion part 67 Communication part 68 Front end Surface 70 Engagement portion 72 Slot opening 74 Engagement edge portion 76 Third through-hole 78 Boundary portion 80 Longitudinal axis 8 Position 84 curved portion 86 notch 86-1 straight 86-2 arc 88 engaging groove 92 lip 96 minute gap 98 purging release port

Claims (7)

A female joint for detachably connecting a male joint,
A cylindrical joint body having a first through hole penetrating in a longitudinal direction from one end to the other end, and having a conduit connected to the one end;
An annular seal member that is coaxial with the first through hole and is sealingly engaged with the other end of the joint body;
An annular purge suppression member provided on the other end of the joint body coaxially with the annular seal member on the radially outer side of the annular seal member;
A ball valve having a spherical outer surface slidably engaged with the annular seal member and the purge suppressing member, and a second through-hole passing through the outer surface in a diametrical direction; A ball valve in which the male joint is inserted into the two through holes so that the third through hole of the male joint and the second through hole communicate with each other;
A casing member set around the ball valve and fixed to the joint body, wherein the ball valve is sealed to the other end side of the first through hole by the outer surface. A second rotation in which the annular seal member is in sealing engagement with the outer surface around the second through hole by aligning and communicating with the moving position and the second through hole in alignment with the first through hole; A casing member that holds the ball valve so as to be rotatable about a rotation center axis passing through the center of the ball valve between
A restriction flow path is formed at least at a part between the purge suppression member and the ball valve, and the ball valve rotates from the second rotation position to the first rotation position. In the process of being moved, the sealing engagement between the annular seal member and the outer surface is at least partially released, and the second through hole communicates with the outside through the restriction flow path, and the ball valve A female joint in which the second through-hole is at least partially detached from the purge suppressing member and communicates with the outside without passing through the restriction channel when the first rotation position is reached.   A concave portion is provided on the outer surface, and a minute gap is formed by the concave portion between the purge suppressing member and the ball valve, and the minute gap defines at least a part of the restriction channel. The female joint according to claim 1, which is configured.   The ball valve includes a valve body having the spherical outer surface, and a shaft portion that extends from the valve body to the outside of the casing member along the rotation center axis and rotates together with the valve body. The outer surface is provided with a shaft mounting portion that is formed to be recessed in the outer surface, and the shaft portion has an engaging portion provided at a base end portion of the shaft portion, The female joint according to claim 2, wherein the female joint is adapted to engage with the shaft attachment portion and attach to the valve body, and the shaft attachment portion also serves as the minute gap.   The purge suppression member has a lip portion that partially engages with the outer surface of the ball valve, and the lip portion forms a gap with the outer surface, and the gap is the restriction channel. The female joint according to any one of claims 1 to 3, wherein at least a part of the female joint is configured.   5. The female mold according to claim 1, wherein the casing member has a purge release port that communicates with the second through hole when the ball valve is in the first rotation position. 6. Fittings.   The female joint according to any one of claims 1 to 5, wherein the annular seal member is made of a rubber material, and the purge suppressing member is made of a resin material harder than the rubber material of the annular seal member. A female joint according to any one of claims 1 to 6,
A male joint inserted and connected to the second through hole of the ball valve of the female joint.

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