JP2011099515A - Joint structure of valve with pipe, and valve - Google Patents

Abstract

To provide a joint structure between a valve and a pipe that maintains a water tightness by evenly bringing the seal material into surface contact over a wide range and maintaining a good water tightness even when a portion that exhibits the water tightness of the seal material moves. provide.
A seal member 13 is disposed in a gap between an insertion port 8 and a receiving port 7, and a push ring 14 that is externally fitted to the insertion port 8 and is movable in a tube axis direction 18 is formed on an opening end surface of the receiving port 7. It is a joint structure of a valve 1 and a pipe 2 that face each other and seal the gap between the insertion port 8 and the receiving port 7 when the sealing material 13 is pushed into the back side of the receiving port 7 by a pusher wheel 14. 13 has a cylindrical portion whose outer peripheral surface is formed in parallel with the inner peripheral surface 12 of the receiving port 7 and whose inner peripheral surface is formed in parallel with the outer peripheral surface of the insertion port 8. When compressed with the insertion port 8, the cylindrical portion is configured to be in surface contact over the entire circumference of the outer peripheral surface of the insertion port 8 and the inner peripheral surface of the receiving port 7. And a spacer 31 that forms a predetermined gap M is interposed between the opening end surface of the receiving port 7.
[Selection] Figure 2

Description

  The present invention relates to a joint structure between a valve and a pipe, and a valve connected to the pipe by the joint structure.

  6 and 7 show the structure of a conventional pipe joint 51. As shown in FIGS. 6 and 7, in the conventional general pipe joint 51, between the receiving port 52 formed at the end of one pipe and the insertion port 53 formed at the end of the other pipe. A sealing material 54 for sealing is inserted into the gap 55 (FIG. 6 shows a state in the middle of inserting the sealing material, and FIG. 7 shows a state in which the sealing material is completely installed). The end surface 56 of the sealing material 54 inserted into the gap 55 is pressed by the pusher wheel 57, and the bulging portion (round portion) 62 formed in the sealing material 54 is pressed against the inner portion 63 of the receiving port 52. The pusher wheel 57 is fixed by a nut 58 while being supported by a T-head bolt 61 attached to the peripheral edge of the receiving port 52. The sealing material 54 pressed against the inner portion 63 of the receiving port 52 and pressed in the tube axis direction is deformed in a direction perpendicular to the tube axis direction, and the inner peripheral surface 59 of the receiving port 52 and the outer peripheral surface of the insertion port 53. In the state which received the compressive force from 60, it arrange | positions in the clearance gap 55 and exhibits watertightness. In addition, as shown in FIG. 6, the bulging part 62 formed in the sealing material 54 in the conventional pipe joint has a simple cross-sectional shape (round).

  FIG. 8 is a cross-sectional view of another conventional pipe joint 71, and FIG. 9 is a cross-sectional view of a packing 74 of the pipe joint 71 (Patent Document 1, etc.). As shown in FIG. 8, a pipe joint 71 is described in which the compression degree of the packing 74 as a sealing material is reduced in order to maintain water tightness even when the connected pipes are bent. When the press ring 77 is pushed into the receiving port 72, the outer peripheral surface 75 of the packing 74 is guided by a tapered surface 76 formed on the opening end side of the receiving port 72, and the inner peripheral surface of the receiving port 72. 79 and an inner space 81 formed by the outer peripheral surface 80 of the insertion opening 73. The packing 74 has a ring shape with a hollow cross section, and the diameter b of the hollow portion 78 is twice the thickness a. The width T of the internal space 81 is twice the thickness a, and the packing 74 is accommodated in the internal space 81 with the hollow portion 78 closed. The packing 74 exhibits water tightness by its own restoring force.

  In addition, it is possible to apply the structure of these pipe joints 51 and 71 also to the joint structure of a valve and a pipe connected to each other with a valve interposed between the pipes.

Japanese Utility Model Publication 3-55031

  In the conventional pipe joint 51 as shown in FIG. 6 and FIG. 7, the sealing material 54 has portions exhibiting water tightness on the outer peripheral surface and the inner peripheral surface of the round portion 62, but the sealing material pushed into the gap 55. When water pressure is applied to 54, the sealing material 54 tends to be pushed out toward the opening end side of the receiving port 52. Along with this, a portion that exhibits water tightness in the sealing material 54 moves, a portion that exhibits water tightness in the sealing material 54, and an inner peripheral surface 59 of the receiving port 52 and an outer peripheral surface 60 of the insertion port 53. In some cases, it is impossible to maintain watertightness. For this reason, in this type of pipe joint 51, it is necessary to strictly manage the tightening torque of all the nuts 58 that press the pusher wheel 57, which takes time and labor. In that respect, in the pipe joint 71 disclosed in Patent Document 1, it is not necessary to push the packing 74 as a sealing material into the inner part of the receiving port 72, and therefore, it is not necessary to manage the tightening torque of the nut 83 that presses the push ring 70. . However, in this pipe joint 71, the cross section of the packing 74 is a hollow circle, but when the packing 74 is compressed so as to close the hollow portion 78, the inner peripheral surface 79 and the insertion port 73 of the receiving port 72 of the packing 74. There is a problem that the compressive force received by the contact surface with the outer peripheral surface 80 is not uniform in the tube axis direction. Furthermore, since the compressed air remains in the hollow portion 78, the hollow portion 78 cannot be completely closed, and the packing 74, the inner peripheral surface 79 of the receiving port 72, and the outer peripheral surface 80 of the insertion port 73 are There is also a problem that surface contact cannot be achieved in a uniform state over a wide range over the entire circumference.

Therefore, when the structure of this kind of conventional pipe joints 51 and 71 is applied to a joint structure of a valve and a pipe, a similar problem occurs.
The present invention solves such a problem, and while maintaining the tightening torque of the nut that presses the press wheel is unnecessary, the sealing material is brought into surface contact uniformly over a wide range to maintain water tightness, and the sealing material It is an object of the present invention to provide a valve-pipe joint structure and a valve that can maintain good watertightness even when a portion that exhibits watertightness moves.

  In order to solve the above-described problems, the joint structure of the valve and the pipe of the present invention has a valve box and a valve body that opens and closes a flow path formed in the valve box, and a receiving port is provided on one of the valve and the pipe. The insertion port is provided on the other side, the insertion port is inserted inside the reception port, and the outer periphery of the insertion port and the inner periphery of the reception port formed in parallel to the outer peripheral surface of the insertion port An annular sealing material is provided in the gap with the surface, and an annular pusher ring that is externally fitted to the insertion port and is movable in the tube axis direction faces the opening end surface of the receiving port from the outside, and the sealing material is received by the pushing ring. It is a joint structure of a valve and a tube which is pushed into the back side of the mouth and seals between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port, and the outer peripheral surface of the sealing material is the inner side of the receiving port. It has a cylindrical part that is formed parallel to the peripheral surface and whose inner peripheral surface is formed parallel to the outer peripheral surface of the insertion port, and is compressed between the receiving port and the insertion port. When this is the case, the cylindrical portion is configured to be in surface contact over the entire circumference of the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port, and between the end surface of the presser wheel and the opening end surface of the receiving port facing each other. A spacer that forms a predetermined gap is interposed.

  According to this configuration, the sealing material has a cylindrical portion having an outer peripheral surface formed in parallel with the inner peripheral surface of the receiving port, and an inner peripheral surface formed in parallel with the outer peripheral surface of the insertion port. When compressed between the insertion port and the cylindrical part, the cylindrical part is in surface contact over the entire circumference of the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port. Watertightness can be maintained, and watertightness is maintained well even when the sealing material receives water pressure and moves a portion that exhibits watertightness. In addition, since a spacer that forms a predetermined gap is interposed between the end face of the pressing wheel and the opening end face of the receiving port, when the pressing wheel is moved in the pressing direction, the end surface of the pressing wheel and the receiving port The gap with the opening end face can be accurately and easily maintained at a predetermined gap. As a result, it is possible to prevent the occurrence of problems such as insufficient sealing function and pressing with excessive pressing force on the sealing material without managing the tightening torque of the nut that presses the push ring. The connection state can be easily obtained.

  Further, the sealing material in the joint structure of the valve and pipe of the present invention has a cross-sectional shape disposed on the back side of the receiving port and an oval bulging portion, and disposed on the receiving port opening end side. And having a corner portion that is a substantially square shape, the cylindrical portion is formed at the center portion of the bulging portion, and the outer periphery of the corner portion is more outward toward the receiving end portion side. The taper surface which thickness increases while diameter expands is formed, It is characterized by the above-mentioned.

  Further, in the sealing material in the joint structure of the valve and the pipe according to the present invention, a stepped recess in which an end portion of the sealing material is accommodated is formed in a portion near the inner periphery of the end surface of the press ring, and the end portion of the sealing material The portion housed in the stepped recess is formed such that the outer periphery of the cross-sectional shape thereof is parallel to the tube axis.

  According to this configuration, when the sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port while the sealing material is pressed by the pressing wheel, the sealing material can be accommodated in the stepped recess of the pressing wheel. In addition, the stepped recesses of the end portion of the seal material and the press ring are improved, and the centering function of the seal material by the press ring and the function of preventing the seal material from protruding from the stepped recesses can be obtained satisfactorily.

  Further, in the joint structure between the valve and the pipe of the present invention, a stepped recess in which the end of the sealing material is accommodated is formed in the inner peripheral portion of the end surface of the press wheel, and the outer peripheral peripheral portion of the stepped recess is The taper surface which expands toward the outer peripheral side of an end surface is formed.

  According to this configuration, when the sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port while the sealing material is pressed by the pressing wheel, the sealing material can be accommodated in the stepped recess of the pressing wheel. Instead, the end of the sealing material is guided into the stepped recess by the tapered surface, and the sealing material can be positioned in a well-centered state.

  As described above, according to the present invention, as the sealing material, the outer peripheral surface is formed in parallel with the inner peripheral surface of the receiving port, and the inner peripheral surface is formed in parallel with the outer peripheral surface of the insertion port. Since the sealing material has a uniform surface contact over a wide range, it can maintain watertightness, and even when the sealing material receives water pressure and the part that exhibits watertightness moves, the watertightness is good. And reliability is improved. In addition, since a spacer that forms a predetermined gap is interposed between the end face of the pressing wheel facing each other and the opening end face of the receiving port, the sealing material does not have to be managed by tightening torque of the nut that presses the pressing wheel. It is possible to prevent the occurrence of problems such as lack of sealing function due to or the pressing of the sealing material with an excessive pressing force, and a good connection between the valve and the pipe can be obtained easily and reliably. This also improves the reliability.

  Further, in the sealing material, a stepped recess in which the end of the sealing material is accommodated is formed in the inner peripheral portion of the end face of the press ring, and a portion accommodated in the stepped recess in the end of the sealing material is By forming the outer periphery of the cross-sectional shape so as to be parallel to the tube axis, the sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port while pressing the sealing material with a push ring. In this case, the sealing material can be positioned in a well-centered state, and the sealing material can be prevented from protruding from the stepped recess, thereby further improving the reliability of the joint structure between the valve and the pipe.

  Further, a stepped recess for accommodating the end portion of the sealing material is formed on the inner peripheral portion of the end surface of the press ring, and a tapered surface that expands toward the outer peripheral side of the end surface is formed on the outer peripheral edge of the stepped recess. By forming the seal material in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port while pressing the seal material with a push ring, the seal material can be positioned with good alignment. This further improves the reliability of the joint structure between the valve and the pipe.

It is a figure which shows the joint structure of the valve and pipe which concern on embodiment of this invention. It is an expanded sectional view of the joint part of the joint structure. It is sectional drawing of the press ring of the joint structure. (A) is an expanded sectional view of the joint part of the joint structure, and shows a state before the sealing material is compressed. (B) is a principal part expanded sectional view of the push ring of the joint structure. (C) is sectional drawing which shows another embodiment of the sealing material of the joint structure. (A) is a side view of the gate valve of the joint structure, (b) is a side view of the press ring of the joint structure (specifically, a side view when viewed from the receiving opening end side with respect to the press ring). . It is an expanded sectional view which shows the conventional pipe joint structure, and shows the insertion middle state of a sealing material. It is an expanded sectional view which shows the conventional pipe joint structure, and shows the mounting completion state of a sealing material. It is an expanded sectional view showing other conventional pipe joint structures. It is sectional drawing of the packing provided in the other conventional pipe joint structure.

Hereinafter, a joint structure between a valve and a pipe and a valve according to an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a soft seal gate valve, which is connected to pipes 2 and 3. The gate valve 1 includes a valve box 4 made of cast iron and the like, and a valve body 6 that opens and closes a flow path 5 formed in the valve box 4. Receiving ports 7 are provided at both ends of the flow path 5 of the valve box 4. In addition, an insertion port 8 is provided at each end of each tube 2, 3, and the insertion port 8 is inserted into the receiving port 7 to form a joint structure 10 between the gate valve 1 and the tubes 2, 3. Yes.

  As shown in FIG. 2, the joint structure 10 includes a gap between the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7 formed in parallel to the outer peripheral surface 11 of the insertion port 8. A ring-shaped elastic sealing material 13 is disposed on the outer surface of the insertion port 8, and an annular push ring 14 that is fitted around the insertion port 8 and is movable in the axial direction of the tube faces the opening end surface 15 of the receiving port 7 from the outside. 13 is pushed into the back side of the receiving port 7 by the pusher wheel 14 so that the space between the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7 is sealed. Further, the push wheel 14 is attached via a bolt 16 in a state in which the push wheel 14 is in contact with the sealing material 13 and faces the opening end surface 15 of the receiving port 7. In addition, 14c in FIG. 2 is an insertion hole through which the bolt 16 is inserted in the pusher wheel 14.

  The receiving port 7 has a tapered surface 17 whose diameter increases toward the opening end surface 15 in the inner periphery of the opening, and on the back side of the tapered surface 17 in the receiving port 7, the outer periphery of the tube axis 18 and the insertion port 8. An inner peripheral surface 12 parallel to the surface 11 is formed. Further, a recess 19 is formed on the inner side of the inner peripheral surface 12 of the receiving port 7, and a lock ring 20 that is divided in the circumferential direction is accommodated in the recess 19. An insertion protrusion 24 that can be engaged with the lock ring 20 from the back of the receiving opening is formed on the outer periphery of the distal end of the insertion opening 8.

  The sealing material 13 is in a sealing material accommodation groove 21 which is a space formed by the tapered surface 17 and the inner peripheral surface 12 of the receiving port 7 and the outer peripheral surface 11 of the insertion port 8 inserted into the receiving port 7. Contained. A flange portion 22 is formed on the outer periphery of the end portion of the receiving port 7, and an insertion hole 23 for a bolt 16 for attaching the presser wheel 14 is provided in the flange portion 22.

  FIG. 3 is a cross-sectional view of the sealing material 13 and shows a state before compression. The sealing material 13 is generally annular, and on the cut surface including the central axis 13a of the sealing material 13, the oval-shaped bulging portion 25 disposed on the back side of the receiving port and the receiving port end side. It is set as the shape which has the corner | angular part 26 which is provided and is substantially square. An arc portion 25a is formed at one end of the bulging portion 25, and a cylindrical portion 25d having an outer peripheral surface 25b and an inner peripheral surface 25c parallel to the central axis 13a is formed continuously with the arc portion 25a. An arc portion 25e connected to the corner portion 26 is formed on the opposite side of the arc portion 25a when viewed from the cylindrical portion 25d. That is, a cylindrical portion 25 d is formed at the center of the bulging portion 25. The outer periphery of the corner portion 26 of the sealing material 13 is reduced in diameter toward the bulging portion 25 (that is, the outer diameter increases toward the receiving end portion side, and the tapered surface 26a increases). An end face 26b disposed on the side opposite to the portion 25 is formed.

  FIG. 4 is a cross-sectional view showing a procedure in which the sealing material 13 is accommodated in the sealing material accommodation groove 21, and FIG. 4A is a cross-sectional view of the joint structure 10, and shows a state before the sealing material 13 is compressed. FIG. 4B is a cross-sectional view of the push wheel 14. As shown in FIG. 4A, when the sealing material 13 is accommodated in the sealing material accommodation groove 21, the pusher wheel 14 is brought into contact with the end surface 26 b of the corner portion 26 of the sealing material 13, so that the sealing material 13 The bulging portion 25 comes into contact with the tapered surface 17 of the receiving port 7 and is compressed. Here, the end portion of the seal member 13 (the portion including the end surface 26b of the corner portion 26) is accommodated in the inner peripheral portion of the end surface 14a of the push wheel 14 (the end surface facing the opening end surface 15 of the receiving port 7). The stepped recess 27 is formed, and the end of the sealing material 13 provided with the end surface 26b of the sealant 13 is accommodated in a state where the end surface 26b of the sealant 13 is in contact with the stepped recess 27. . Here, in the embodiment shown in FIG. 4A, the portion of the end portion of the sealing material 13 accommodated in the stepped recess 27 has a cross-sectional outer periphery parallel to the tube axis. ing. The outer diameter of the stepped recess 27 of the press wheel 14 is substantially equal to the outer diameter of the end surface 26 b of the sealing material 13, and the outer peripheral edge of the stepped recess 27 is directed toward the outer peripheral side of the end surface 14 a of the press wheel 14. Thus, a tapered surface 28 that expands in diameter is formed. The inclination angle α of the tapered surface 28 with respect to the surface orthogonal to the tube axis 18 is set to 60 °, for example. The tapered surface 28 of the pusher wheel 14 guides the end surface 26b of the sealing material 13 to the stepped recess 27, so that the operator can easily position the pusher wheel 14 and a nut that is screwed into the bolt 16. At the time of tightening 29, it is possible to prevent the corner portion 26 from being deformed radially outward by the reaction force and causing a positional shift. Although the case where the inclination angle α of the tapered surface 28 is set to 60 ° has been described, the present invention is not limited to this, and the inclination angle α of the tapered surface 28 may be set in the range of 50 ° to 80 °. Good.

  Here, the presence or absence of the sandwiching prevention effect of the sealing material 13 with respect to the inclination angle α of the tapered surface 28 and the presence or absence of the automatic centering effect of the push ring 14 will be described. The effect of preventing the sealing material 13 from being pinched is that the end portion including the end surface 26 b of the sealing material 13 protrudes from the stepped recess 27 and is sandwiched between the end surface 14 a of the press wheel 14 and the opening end surface 15 of the receiving port 7. It is an effect that can be prevented. The automatic centering effect of the pusher wheel 14 is an effect in which the pusher wheel 14 rises with respect to the insertion opening 8 and is automatically centered.

  By setting the inclination angle α of the tapered surface 28 in a range of 50 ° to 80 °, both the sandwiching prevention effect of the sealing material 13 and the automatic centering effect of the press ring 14 are surely exhibited. When the inclination angle α of the tapered surface 28 is less than 50 °, the restriction function of the tapered surface 28 with respect to the end surface 26b of the sealing material 13 is insufficient, and the end surface 26b of the sealing material 13 slides on the tapered surface 28 and expands. It becomes easy to move (deform) in the radial direction and the effect of preventing the sealing material 13 from being caught cannot be obtained. On the other hand, when the inclination angle α exceeds 80 °, the amount of rise of the pusher wheel 14 with respect to the insertion opening 8 is insufficient, and the center of the pusher wheel 14 does not coincide with the tube axis 18, so that the automatic centering effect of the pusher wheel 14 is obtained. It can no longer be obtained.

  FIG. 4C is a cross-sectional view of the sealing material 13 further provided with a tapered surface 30. As shown in this figure, a tapered surface 30 may be formed over the entire periphery of the outer peripheral edge portion of the end surface 26 b of the sealing material 13. The tapered surface 30 is expanded in the direction in which the pusher wheel 14 pushes the seal material 13. By setting the inclination angle β of the tapered surface 30 with respect to the surface orthogonal to the tube axis 18 in the range of 50 ° to 80 °, the sandwiching prevention effect of the sealing material 13 and the automatic centering effect of the presser wheel 14 are achieved. Both are demonstrated reliably. The inclination angle α of the tapered surface 28 formed on the outer peripheral edge of the stepped recess 27 may be the same as the inclination angle β of the tapered surface 30 on the sealing material 13 side, or in the range of 50 ° to 80 °. May be different.

  A plurality of bolts (hexagonal bolts) 16 are inserted through the flange portion 22 of the receiving port 7, and are inserted through insertion holes 14 c formed in the outer peripheral peripheral edge portion 35 of the push ring 14. The bolt 16 inserted into the insertion hole 14c is screwed with a nut 29. When the nut 29 is tightened, the seal material 13 is gradually accommodated in the seal accommodation groove 21 by the pusher wheel 14. On the peripheral edge of the end face 14a of the press ring 14 facing the flange portion 22 of the receiving port 7, convex portions 31 as spacers are formed at a plurality of locations in the circumferential direction. The convex portions 31 are opposite to the press wheels 14 facing each other. A predetermined gap M is formed between the end face 14 a of the first and the open end face 15 of the receiving port 7. That is, when the nut 29 is tightened, the convex portion 31 comes into contact with the flange portion 22 of the receiving port 7, and the push wheel 14 and the receiving port 7 are metal touch bonded with a predetermined interval M therebetween. As a result, even if tightening torque management of the nut 29 that presses the pusher wheel 14 is not strictly performed, there is a problem that the sealing function by the sealing material 13 is insufficient or the sealing material 13 is pressed by an excessive pressing force. Therefore, the soft seal gate valve 1 and the pipes 2 and 3 can be connected well.

  In addition, the convex portion 31 is not formed, and the sealing material 13 is attached from the gap portion at a plurality of circumferential positions where there are gaps between the press wheel 14 and the flange portion 22 of the receiving port 7 even after metal touch bonding. It is also possible to check the situation by visual means. In the present embodiment, the case where the hexagonal bolt 16 is used as the fastening means has been described. However, the present invention is not limited to this. For example, a T-type bolt having a T-shaped head can be used. It is. Further, in the present embodiment, as shown in FIGS. 5A and 5B, a protrusion 22 a that protrudes in the horizontal direction is formed in the flange portion 22, and an insertion hole through which the bolt 16 is inserted is formed at this location. Correspondingly, a protrusion 14b that protrudes in the horizontal direction is formed also on the push wheel 14 and an insertion hole 14c through which the bolt 16 is inserted is formed at this location. Absent. Moreover, although the case where the convex part 31 was provided in four places in the push ring 14 was described, the convex part 31 may provide two or more places.

  By the way, when the sealing material 13 is accommodated in the seal accommodation groove 21, the tapered surface 26 a of the sealing material 13 comes into contact with the tapered surface 17 formed in the opening of the receiving port 7. When the tapered surface 26a of the sealing material 13 and the tapered surface 17 of the receiving port 7 come into contact with each other, the pusher wheel 14 is metal touch bonded to the opening end surface 15 of the receiving port 7. The tapered surface 26 a of the material 13 is not further pressed against the tapered surface 17 of the receiving port 7 and deformed. The hardness of the corner portion 26 of the sealing material 13 is higher than the hardness of the bulging portion 25, and when the tapered surface 26 a of the sealing material 13 contacts the tapered surface 17 of the receiving port 7, the receiving portion 7 and the insertion port are inserted by the corner portion 26. 8 and 8 are integrated.

  The seal housing groove 21 is provided with a space 21 a formed by the inner peripheral surface 12 of the receiving port 7 and the outer peripheral surface 11 of the insertion port 8, and the inner peripheral surface 12 of the receiving port 7 and the outer peripheral surface 11 of the insertion port 8. Is parallel. The space 21 a accommodates the bulging portion 25 of the sealing material 13, and the cylindrical portion 25 d comes into contact with the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7. The inner peripheral surface 25c and the outer peripheral surface 25b forming the cylindrical portion 25d are parallel to each other in the outer peripheral surface 11 of the insertion port 8 and the receiving port 7 in a state in which the bulging portion 25 is maintained in parallel even after being accommodated in the space 21a. It contacts the peripheral surface 12 and is compressed uniformly.

  Moreover, since the bulging part 25 of the sealing material 13 is solid, the surface contact of a wide range is not prevented by the compressed air like the case where the bulging part 25 is hollow. The inner peripheral surface 25c and the outer peripheral surface 25b of the bulging portion 25 are in surface contact over the entire periphery and exhibit good watertightness by being uniformly compressed. Note that the bulging portion 25 does not exhibit water tightness when the push wheel 14 receives a reaction force of the pressing force that presses the sealing material 13.

  The pusher wheel 14 is provided to push the sealing material 13 into the seal housing groove 21 and hold the pushed sealing material 13 in the seal housing groove 21 against the water pressure in the receiving port 7. The joint with the mouth 7 can be a metal touch joint with a good posture, and even when the number of bolts 16 for attaching the pusher wheel 14 to the receiving port 7 is reduced, the posture of the pusher wheel 14 with respect to the receiving port 7 is maintained well. it can.

  The case where the sealing material 13 receives water pressure will be described. The bulging portion 25 tends to expand in the radial direction when subjected to water pressure. However, since the expansion is limited by the inner peripheral surface 12 of the receiving port 7 and the outer peripheral surface 11 of the insertion port 8, the cylindrical portion 25d includes: A compressive force due to water pressure is further applied. The inner peripheral surface 25c and the outer peripheral surface 25b of the cylindrical portion 25d are in contact with the outer peripheral surface 11 and the inner peripheral surface 12 in a state where the bulging portion 25 is maintained in parallel even after receiving the water pressure. The inner peripheral surface 25c and the outer peripheral surface 25b of the cylindrical portion 25d are in surface contact over the entire circumference and are uniformly compressed in a state in which a compressive force due to water pressure is further applied, so that the water tightness is maintained well.

  The case where the bulging part 25 receives water pressure and moves to the opening side of the receiving port 7 will be described. If the movement distance of the bulging portion 25 is within the range of the length of the cylindrical portion 25d in the tube axis direction, the inner circumference of the cylindrical portion 25d can be obtained even after the bulging portion 25 has moved to the opening side of the receiving port 7. Surface contact over the entire circumference of the surface 25c and the outer peripheral surface 25b and the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7 is maintained. The contact surfaces of the inner peripheral surface 25c and the outer peripheral surface 25b of the cylindrical portion 25d are uniformly compressed and the water tightness is maintained well.

  Thus, the required sealing function is achieved by compression between the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7 formed parallel to the outer peripheral surface 11 of the insertion port 8. In addition, the sealing material 13 is received from the opening end of the receiving port 7 and the outer peripheral surface 11 of the insertion port 8 by being fastened to the receiving port 7 while being in contact with the end surface of the receiving port 7. The seal ring 13 is pushed between the inner peripheral surface 12 of the port 7 and held in the pressed state. The seal member 13 has an outer peripheral surface 25 b formed in parallel with the inner peripheral surface 12 of the receiving port 7. When the inner peripheral surface 25c has a cylindrical portion 25d formed in parallel with the outer peripheral surface 11 of the insertion port 8, and the cylindrical portion 25d is compressed between the receiving port 7 and the insertion port 8, Since the surface contact is made over the entire circumference of the outer peripheral surface 11 of the insertion port 8 and the inner peripheral surface 12 of the receiving port 7, the sealing material 13 is used. It is uniformly surface-contact with have a range able to maintain watertightness, the seal member 13 is watertight even when a portion to exert watertightness receives water pressure moves can be maintained.

1 Gate valve (soft seal gate valve)
2, 3 Pipe 4 Valve box 5 Flow path 6 Valve body 7 Receiving port 8 Insertion port 10 Joint structure 13 Sealing material 14 Push ring 21 Sealing material receiving groove 25 Swelling portion 25a Arc portion 25b Outer peripheral surface 25c Inner peripheral surface 25d Cylindrical portion 25e Arc portion 26a Tapered surface 26b End surface 27 Stepped recess 28 Tapered surface 30 Tapered surface 31 Projection (spacer)
M Predetermined gap

Claims (5)

The valve box and the valve having a valve body that opens and closes the flow path formed in the valve box and the pipe are provided with a receiving port and the other is provided with an insertion port,
An insertion slot is inserted inside the receptacle,
An annular sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port formed parallel to the outer peripheral surface of the insertion port,
An annular push ring that is externally fitted to the insertion opening and is movable in the axial direction of the pipe faces the opening end face of the receiving opening from the outside,
A joint structure of a valve and a pipe that seals between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port when the sealing material is pushed into the receiving port by the push ring,
The sealing material has a cylindrical portion whose outer peripheral surface is formed in parallel with the inner peripheral surface of the receiving port and whose inner peripheral surface is formed in parallel with the outer peripheral surface of the insertion port. When compressed between the insertion port, the cylindrical portion is configured to be in surface contact over the entire circumference of the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port,
A joint structure of a valve and a pipe, wherein a spacer forming a predetermined gap is interposed between an end face of a push wheel and an opening end face of a receiving port facing each other. The sealing material has a bulging portion whose cross-sectional shape is disposed on the back side of the receiving port and has an oval shape, and a corner portion which is disposed on the receiving end side of the receiving port and has a substantially square shape. It has a connected shape,
The cylindrical portion is formed at the center of the bulging portion,
2. The valve / pipe joint structure according to claim 1, wherein a taper surface is formed on the outer periphery of the corner portion to increase in thickness while the outer diameter increases toward the receiving end portion side. A stepped recess for accommodating the end portion of the sealing material is formed on the inner peripheral portion of the end surface of the press ring, and the portion of the end portion of the sealing material that is accommodated in the stepped recess has an outer periphery of its cross-sectional shape. The joint structure of a valve and a pipe according to claim 1 or 2, wherein the joint structure is formed so as to be parallel to the pipe axis. A stepped recess that accommodates the end of the sealing material is formed on the inner peripheral portion of the end surface of the press ring, and a tapered surface that expands toward the outer peripheral side of the end surface is formed on the outer peripheral edge of the stepped recess. The joint structure of a valve and a pipe according to any one of claims 1 to 3, wherein A valve connected to a pipe by the joint structure according to any one of claims 1 to 4,
Having a valve box and a valve body for opening and closing a flow path formed in the valve box,
A valve characterized in that a receiving port is provided in at least one of flow path end portions of the valve box.

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