JP2009144872A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve that has a high physical-property strength against stress occurring in a joined part between a valve part and a joint part due to expansion/contraction or bending of a conduit and high water-pressure-resistant strength against an internal pressure such as fluid pressure or water hammer due to a water-hammer phenomenon, and also, facilitates valve replacement and component replacement. <P>SOLUTION: The valve is composed of a valve part 1 and a joint part 2. The valve part 1 has a valve element 4 for executing opening/closing or switching of at least a two-way channel communicating with the inside of a valve body 3, a flanged short pipe 6, and a cap nut 7. The flanged short pipe 6 is fixed to the valve body 3 by the cap nut 7 screwed to the valve body 3. A socket part 25 is provided at one end part of the joint part 2, while a pipe part 28 is provided at the other end part so as to be joined to a short-pipe part 15 of the flanged short pipe 6. The joint part 2 further has an annular coming-off preventing ring 21 locked to a pipe inserted into the socket part 25. The short-pipe part 15 of the flanged short pipe 6 in the valve part 1 and the pipe part 28 of the joint part 2 are melted so as to be integrally joined. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve used in various industries such as a chemical factory or semiconductor manufacturing field, liquid crystal manufacturing field, and food field. More specifically, the present invention relates to a high physical strength and water resistance at a joint part between a valve part and a joint part. It has a pressure characteristic and can easily exchange valves and parts. The pipe connection work can be done easily and instantly without the use of tools. Especially valves made of vinyl chloride resin. It is not necessary to prepare adhesives at the construction site in olefin resin valves, and it is easy to assemble and connect pipe fittings for olefin resin valves, and it is related to resin valves that can be used for a long time for fluid transportation such as high-temperature chemicals. is there.

  Conventionally, as a valve used in various industries, there is a ball valve as shown in FIG. 9 (see, for example, Patent Document 1). In this ball valve, a ball 102 capable of opening and closing the flow path is disposed in the valve main body 101, and a ball sheet 103 is brought into contact with the ball 102 from both sides of the flow path, and at least one of the ball sheets 103 is connected to the valve main body. A male screw 104 provided on the outer peripheral surface of the female screw 104 provided on the inner peripheral surface on the opening end side of 101 is pressed against the ball 102 by a ball presser 106, and the end of the valve body 101 is A union nut 108 is screwed onto a male screw 107 on the outer periphery of the part, and the connection sleeve 109 is pressed toward the ball presser 106 by the union nut 108. Such a ball valve is connected to the pipe by connecting the pipe to the connection sleeve 109.

  However, when the above ball valve is made of resin, to connect the pipe to the pipe, for example, if the ball valve is made of vinyl chloride resin, it is connected using an adhesive at the construction site. To do this, a special adhesive must be prepared, and it may be difficult to perform the work outdoors on rainy days. If it is sufficient, there is a problem that adhesion failure may occur. Also, if the ball valve is an olefin resin such as polypropylene, the adhesive for olefin resin does not melt and bond the resin unlike vinyl chloride resin, so the adhesive strength necessary for pipe connection can be obtained. Cannot be used for piping. For this reason, when connecting pipes of valves made of olefin resin, heat welding such as socket welding or butt welding is performed at the construction site. For heat welding, a dedicated heating device or power supply must be prepared, and heating is performed. Since the process from cooling to cooling is necessary, there are problems that it takes a lot of time to perform piping construction at the construction site and that outdoor construction on a rainy day is very difficult.

  As a method for solving the above-mentioned conventional problems, there is a method using a piping device for dissimilar pipe joining as shown in FIG. In this dissimilar pipe joining piping device, a plurality of receiving joint portions 110, 111 are provided on the valve body of the valve, and the diameter of the joining portions 110, 111 is reduced along the outer ends of the end portions. An annular taper groove 112 is formed, and the taper groove 112 is formed in a common taper groove shape so that the extraction preventing mechanisms 113 and 114 used for different types of pipes such as a metal pipe or a resin pipe can be selectively mounted. In addition, a taper surface 115 that receives a reaction force in the common taper groove 112 is provided on the outer periphery of each of the extraction prevention mechanisms 113 and 114 so that any dissimilar pipe can be joined to the instrument body. . When connecting a pipe such as a metal pipe or a resin pipe to such a piping device, the extraction preventing mechanisms 113 and 114 are locked and connected by simply inserting the pipe from the opening of the joint part 110 or 111 for receiving port. it can.

JP 2001-248745 A JP 2001-289376 A

  However, the piping equipment as described above is formed so that the joint portions 110 and 111 for receiving ports are integrally formed in the valve equipment body, and therefore the valve cannot be removed from the pipe line after pipe connection. . Therefore, when exchanging the valve, there is a problem that the valve must be disconnected from the pipe portion connected to the pipe line and a new valve must be connected again by piping. In addition, when connecting a new valve to the pipe, the cut surfaces of the pipe from which the valve has been cut are fixed in a state of facing each other with a gap therebetween, so There is a problem that it is difficult to obtain a stroke for inserting a pipe. When connecting a new valve to such a pipe, one end of the pipes facing each other is inserted into the joint part 110 for the receiving port, and the other end of the pipe from the end surface of the joint part 111 for the receiving port at this time A pipe having a length that matches the distance to the end surface on the side and the amount of the pipe inserted into the receiving joint 111 is inserted into one end of the pipe into the receiving joint 111 and the other end faces each other. A method of making contact with the other end face of the pipe and connecting it using welding or a dedicated connecting jig, or inserting a pipe into each of the joint portions 110 and 111 for receiving ports, Depending on the distance between the pipes facing each other, the end faces of the pipes are brought into contact with each other and connected using welding or a special connection jig. However, such pipe connections are difficult to work with. And skill There is a problem in that.

  In addition, since the above-described piping device extraction prevention mechanisms 113 and 114 are locked to the inserted pipe, the inner diameters of the extraction prevention mechanisms 113 and 114 are substantially the same or slightly larger than the outer diameter of the inserted pipe. Must be formed small. For this reason, in particular, when performing the work of inserting the pipes into the joint portions 110 and 111 for the receiving ports, when the pipe is inserted with the axis of the pipe to be inserted shifted, the anti-extraction mechanisms 113 and 114 are inserted when the pipe is inserted. There is a problem that the saw teeth of the extraction preventing mechanisms 113 and 114 damage the outer surface of the pipe when passing through the inner circumference of the pipe, and there is a possibility that fluid leakage may occur from the scar depending on the depth of the scar.

  The present invention has been made in view of the above-described problems of the prior art, and has high physical property strength against the stress generated in the joint portion between the valve portion and the joint portion due to expansion and contraction or bending of the pipe line, fluid pressure and water. It has a high water pressure resistance against internal pressure such as water hammer due to hammer phenomenon, and can easily replace valves and parts, and pipe connection work can be done easily and instantly without using tools. In particular, it is not necessary to prepare adhesives at the construction site for valves made of vinyl chloride resin, it is easy to assemble and connect pipe fittings for olefin resin valves, and transport fluids such as high-temperature chemicals An object of the present invention is to provide a resin valve that can be used for a long time.

  In order to solve the above problems, the present invention provides a valve body having at least two connecting portions for connecting a pipe, and opening / closing or switching of at least two flow paths communicating with the valve body through the pipe. A tubular body having a valve body, a short tube having a short tube and a flange extending radially outward from one end of the short tube, and a female threaded portion on the inner peripheral surface And a cap nut having an annular ridge projecting radially inward at one end, and the short tube portion of the flanged short tube is inserted inside the annular ridge portion of the cap nut. In this state, the internal thread portion of the cap nut is screwed into the external thread portion provided on the outer peripheral surface of the connection portion of the valve body, and the short tube with a flange is interposed between the end surface of the connection portion and the annular protrusion. The short tube with a flange is moved to the valve book by sandwiching the flange. A valve part fixed to the pipe, a receiving part into which a pipe is inserted at one end part, and a pipe part joined to the short pipe part of the flanged short pipe at the other end part. A joint portion having an annular retaining ring for engaging with a pipe inserted into the mouth portion, and the short tube portion of the flanged short tube and the tube portion of the joint portion are melted and integrated. Provided is a valve that is adapted to be mechanically joined.

  In the above valve, the joint portion includes a joint body provided with a threaded portion at one end and the tube portion at the other end, and a fastening member threaded onto the threaded portion. It is preferable that the retaining ring is reduced in diameter by screwing the fastening member onto the attachment portion and is engaged with the outer peripheral surface of the pipe.

  In the above case, a male screw portion is provided as an outer periphery of one end portion of the joint body as the screwing portion, and a female screw portion that is screwed into the male screw portion of the joint body inside the fastening member, and the female screw portion A retaining ring accommodating portion that accommodates the retaining ring in a state where the axial end surface of the retaining ring is in contact with an end surface of one end portion of the joint body, and the retaining ring housing And the outer periphery of the retaining ring is slidable to the tapered surface of the inner periphery of the retaining ring housing portion. The tapered surface gradually decreases in the direction away from the female threaded portion of the fastening member. It is further preferable to have a tapered surface that comes into contact.

  Furthermore, it is preferable that the retaining ring has an inner diameter that is 0.5 to 3 mm larger than the outer diameter of the pipe.

  Moreover, it is preferable that the retaining ring is rotatable together with the fastening member.

  Further, the outer diameter of the pipe portion of the joint portion is smaller than the inner diameter of the annular protrusion of the cap nut, and the remaining portion of the pipe portion and the remaining portion of the joint portion from the end surface of the flanged short pipe It is preferable that the distance to the boundary is larger than the axial length of the cap nut.

  In addition, a protrusion having a diameter larger than that of the pipe portion is provided at a boundary between the pipe portion and the remaining portion in the joint portion, and the end portion of the joint portion from the end surface on the flange side of the flanged short pipe. It is preferable that the distance to the side surface of the protrusion on the tube side is larger than the axial length of the cap nut.

  The valve part and the joint part may be formed of an olefin resin.

  In this case, it is more preferable that the valve part and the joint part are made of polypropylene.

  In addition, a receiving portion is formed in the short tube portion of the flanged short tube, and an insertion portion that can be fitted into the receiving portion of the short tube portion is formed in the tube portion of the joint portion. The receiving part of the part and the insertion part of the pipe part may be joined by socket fusion.

  Further, the valve part and the joint part are made of vinyl chloride resin, and a receiving part is formed in the short pipe part of the flanged short pipe, and the pipe part of the joint part is formed in the short pipe part. A fitting insertion part may be formed, and the receiving part of the short pipe part and the insertion part of the pipe part may be joined by adhesion with an adhesive.

  Moreover, it is preferable that at least two seal rings are disposed on the inner periphery of the receiving portion of the joint portion.

  The valve portion may be any one of a ball valve, a diaphragm valve, and a gate valve.

  Further, the valve element can be driven by any one of manual type, pneumatic type and electric type.

  In the present invention, the short tube portion of the short tube with a flange and the tube portion of the joint portion are melted and joined so as to be integrated, and as a joining method, heat welding such as fusion or welding is preferable. Adhesion may be used as long as it can be integrally bonded by being melted with an adhesive such as vinyl chloride resin.

Since the present invention is configured as described above, the following excellent effects can be obtained.
(1) Since the valve part and the joint part are melted and integrally joined, the high physical property strength against the stress generated at the joint part of the valve part and the joint part due to expansion and contraction of the pipe line, fluid pressure and water High water pressure resistance against internal pressure such as water hammer due to the hammer phenomenon can be obtained.
(2) Even after the valve is piped, the valve part and the joint part can be disassembled and the valve and parts can be replaced.
(3) When connecting pipes to valves, various tools and tools for connection are not required, and connection is easy and can be performed instantaneously.
(4) When the distance from the end face of the flanged short pipe to the boundary between the pipe part and the remaining part of the joint is larger than the axial length of the cap nut, replace the valve parts. Sometimes, the cap nut can be easily removed and attached without obstructing the removal, and the maintenance after the piping work can be easily performed.
(5) Since each member of a valve part and a joint part is formed with an olefin resin, piping connection can be easily and instantaneously without requiring a heat welding apparatus or a power source at a construction site.
(6) The valve and joint parts are made of polypropylene, so that the valve has chemical resistance to acids and alkalis at high temperatures, has excellent high-temperature creep characteristics, and uses chemicals at high temperatures for long periods of time. can do.
(7) Since the valve and joint parts are made of vinyl chloride resin, there is no need to prepare adhesives at the construction site, and connections can be made without being affected by external factors such as weather and climate. It can be carried out.
(8) When the pipe is inserted into the joint and locked, the retaining ring is not damaged except at the position where the retaining ring is locked to the outer periphery of the pipe, and there is no risk of fluid leakage and a reliable connection can be made. it can.

  Hereinafter, although an embodiment of the present invention is described with reference to drawings, it cannot be overemphasized that the present invention is not limited to this embodiment.

  1 is a longitudinal sectional view of a ball valve showing a first embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of a main part before connection of the valve part and the joint part of FIG. 1, and FIG. 3 is a main part of FIG. 4 is an enlarged longitudinal sectional view of the main part after the pipe connection in FIG. 1, FIG. 5 is a longitudinal sectional view showing a state after the pipe connection in FIG. 1, and FIG. 6 is a projection provided on the joint body. FIG. 7 is an enlarged vertical sectional view of a main part of another joint portion showing the second embodiment of the present invention, and FIG. 8 is a third embodiment of the present invention. It is a longitudinal cross-sectional view of the diaphragm valve which shows this.

  Hereinafter, a ball valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  The ball valve is composed of a valve portion 1 and a joint portion 2. The valve unit 1 includes a valve body 3, a valve body 4, a valve body presser 5, a flanged short pipe 6, and a cap nut 7.

  The valve body 3 is made of polypropylene (hereinafter referred to as PP) having a diameter of 25 mm. The valve body 3 has a substantially hollow cylindrical shape. A valve chamber 8 is provided along the flow path axis. A through hole into which the stem 9 is inserted in a direction intersecting the flow path axis communicates with the valve chamber 8. It is provided as follows. Moreover, the connection part by which the external thread part 10 was formed in the outer periphery is provided in the flow-path axial direction both ends of the valve main body 3, and the internal thread part 11 is further provided in one inner periphery of two connection parts. Is provided.

  The valve body 4 has a ball shape and is made of PP. The valve body 4 is disposed in the valve chamber 8 of the valve body 3 and is fitted to a stem 9 having a handle 12 fitted on the upper part thereof. When the ball valve is fully closed, that is, when fluid pressure is applied upstream, the valve body 4 is fitted to the stem 9 while the valve body 4 can move slightly downstream in the valve chamber 8. Has been.

  The valve body presser 5 is made of PP. The valve body presser 5 has a cylindrical shape, and an O-ring is fitted on the outer periphery. Further, an outer threaded end portion of the valve body retainer 5 is provided with a male threaded portion 11 that is screwed to a female thread portion 11 provided at one of the connection portions of the valve body 3, and the valve body retainer 5 is connected to the valve body 3. The valve body 4 is pressed and held by the seat 13 from both sides of the flow path in the valve chamber 8 by being screwed to the portion. An O-ring 14 is disposed on the end face of the valve body presser 5 with which the short tube 6 with a flange, which will be described later, comes into contact.

  The short tube 6 with a flange is made of PP, and an annular flange 16 extending outward in the radial direction is provided at one end of the short tube portion 15 in the axial direction.

  The cap nut 7 is made from PP. The cap nut 7 includes a cylindrical main body portion, and a female screw portion 17 that is screwed to the male screw portion 10 of the valve main body 3 is provided on the inner periphery of one end portion in the axial direction of the cylindrical main body portion. The other end portion in the axial direction is provided with an annular ridge portion 18 projecting inward in the radial direction. The female screw portion 17 may be provided over the inner circumference of the entire cylindrical main body portion. The cap nut 7 inserts the short tube portion 15 of the short tube 6 with a flange into the inside of the annular protrusion 18, and presses the flange portion 16 of the short tube 6 with a flange through the O-ring 14 to hold the valve body 3 and the valve body. 5 is screwed to the valve body 3 in a state of being sandwiched between the outer end surface of 5 and the inner surface of the annular ridge 18 facing the outer end surface. At this time, each flow path from the both openings of the flanged short tube 6 arranged at both ends of the valve body 3 in the flow path axial direction to the valve body 4 becomes the first flow path and the second flow path.

  The joint portion 2 includes a joint body 19, a cap nut 20, and a retaining ring 21.

  The joint body 19 is made of PP. The joint main body 19 has a cylindrical shape, and has a distal end portion 22 provided with a tapered surface that is accommodated (fitted) in a retaining ring accommodating portion 31 of a cap nut 20 described later on the outer periphery of one axial end portion, and will be described later. A male screw portion 23 that is a screwed portion with the cap nut 20 and an annular protrusion 24 formed in a bowl shape are provided continuously, and a pipe 43 is inserted into the inner periphery of one end in the same axial direction. It has a mouth portion 25. An annular groove is formed on the inner periphery of the receiving portion 25, and a seal ring 26 is disposed in the annular groove. Further, a stepped portion 27 with which the distal end surface of the inserted pipe 43 abuts is formed on the back side of the receiving portion 25. On the other hand, the other end of the joint body 19 is provided with a pipe portion 28 and the projection 24 so as to be continuous. The pipe portion 28 is integrated with the short pipe portion 15 of the flanged short pipe 6 by socket fusion. Are joined together. The protrusion 24 is provided so as to be able to come into contact when the cap nut 20 which will be described later is tightened or when the cap nut 7 is detached from the valve body 3 and the outer periphery of the short tube portion 15 and the tube portion 28 is slid. The shape is not particularly limited, such as a plate shape or a rod shape. For example, a single protrusion 24 may be provided on the outer periphery of the joint main body 19, or a plurality of protrusions may be provided at equal intervals along the outer periphery of the joint main body 19. May be provided. Since it is easy to mold and can be molded with good dimensional accuracy, it is preferable to use a bowl shape. Further, in the present embodiment, there is one seal ring 26, but two or more seal rings may be provided in parallel as shown in FIG.

  The cap nut 20 is a fastening member made of PP. The cap nut 20 has a cylindrical shape, and has a through-hole portion 33 into which the pipe 43 is inserted. The female screw portion 29 is formed on the inner periphery of one end portion in the axial direction, and is directed away from the female screw portion 29. A retaining ring accommodating portion 31 having a tapered surface 30 that gradually decreases in diameter is formed. In the retaining ring accommodating portion 31, a contact surface 32 on which a side surface of the retaining ring 21 described later is abutted is provided at an end portion in the diameter reducing direction of the tapered surface 30.

  The retaining ring 21 is made of polyphenylene sulfide. The retaining ring 21 is disposed in the retaining ring accommodating portion 31 in a state where the outer peripheral surface is in contact with the tapered surface 30 of the cap nut 20. The retaining ring 21 has a notch (not shown) that cuts off the circumference, and a locking blade 34 having a sawtooth cross section that can be locked to the outer peripheral surface of the pipe 43 is formed on the inner surface. Further, the minimum inner diameter of the retaining ring 21 is formed to be 1.2 mm larger than the outer diameter of the pipe 43 to be inserted.

  In the above embodiment, the valve body 3, the valve body 4, the valve body presser 5, the flanged short pipe 6, the cap nut 7, the joint body 19 that forms the joint portion 2, and the cap nut 20 that form the valve portion 1 are PP. These are olefins such as polyethylene (hereinafter referred to as PE), polybutene (hereinafter referred to as PB), and acrylonitrile butadiene styrene copolymer (hereinafter referred to as ABS). Resin, vinyl chloride resin (hereinafter referred to as PVC), polystyrene, polyacetal, acrylonitrile butadiene styrene copolymer, polyvinylidene fluoride, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, polychlorotri You may produce from resin, such as a fluoroethylene. In particular, the valve of the present invention uses an olefin-based resin such as PP, PE, PB, ABS, or the like, which does not have an adhesive suitable for pipe connection, and needs to be thermally welded at a construction site, as a valve material. Among them, PP is more suitable because it can be used for a wide range of applications because it has high temperature characteristics and creep characteristics of the valve and is excellent in chemical resistance, and is inexpensive.

  The flanged short tube 6 and the joint main body 19 need to be formed of resins that can be fused to each other. The material of the pipe 43 connected to the valve of the present invention may be the same material as the members constituting the valve part 1 and the joint part 2 in order to unify chemical resistance characteristics and physical properties in the pipe line. desirable.

  In the above embodiment, the retaining ring 21 is described as being made from polyphenylene sulfide. However, the material of the retaining ring 21 is not limited to this, and the retaining ring 21 is made from a hard material such as stainless steel. Alternatively, only the portion of the inner peripheral locking blade 34 may be made of a hard material such as stainless steel, and the other portion may be formed of resin, or may be made of a material having higher hardness than the pipe 43.

  Next, a procedure for joining the valve portion and the joint portion of the ball valve according to the first embodiment of the present invention by heat welding will be described with reference to FIGS. Here, socket fusion is used as a method of thermal welding.

  In the state before the valve portion 1 and the joint portion 2 shown in FIG. 2 are joined, an insertion portion 42 having the same outer peripheral shape as the outer peripheral shape of the pipe is formed at the end portion of the pipe portion 28 of the joint main body 19. On the other hand, the flanged short tube 6 of the valve portion 1 is formed with a receiving portion 41 into which the distal end portion of the insertion portion 42 can be fitted.

  First, as shown in FIG. 2, the flanged short tube 6 is inserted into the cap nut 7 with the short tube portion 15 facing forward from the female threaded portion 17 side end of the cap nut 7. The tube portion 15 is inserted into the annular ridge portion 18 of the cap nut 7 so that the flange portion 16 of the flanged short tube 6 and the inner side surface of the annular ridge portion 18 of the cap nut are engaged. Next, in order to heat-weld the flanged short tube 6 and the joint body 19 by socket fusion, the flanged short tube 6 in which the cap nut 7 is engaged with one convex side of the heater of the fusion machine. The joint body 19 is fitted to the other concave side, and the outer periphery of the insertion portion 42 at the end of the tube portion 28 of the joint body 19 and the receiving portion of the short tube portion 15 of the flanged short tube 6 are fitted. The inner periphery of 41 is heated with a heater (not shown). After heating in an appropriate time, the joint body 19 and the flanged short tube 6 are separated from the heater, and the insertion portion 42 of the joint body 19 is inserted into the receiving portion 41 of the flanged short tube 6 without leaving time. The bonding operation is completed by fixing in this state for a certain period of time and cooling the fused portion. After joining by thermal welding, the flange portion 16 of the flanged short tube 6 is brought into contact with the axial end surface of the connection portion of the valve body 3, and the cap nut 7 is screwed to the connection portion of the valve body 3, so that the valve body The joint portion 2 is fixed to the valve portion 1 by sandwiching the flange portion 16 between the end surface of the connection portion 3 and the inner side surface of the annular ridge portion 18 of the cap nut 7 (state of FIG. 3).

  Here, the pipe part 28 of the joint part 2 has an outer diameter smaller than the inner circumference of the annular protrusion 18 of the cap nut 7, and the pipe part 28 is passed through the inner circumference of the cap nut 7 to The nut 7 refers to a portion that can slide on the outer periphery of the pipe portion 28. The distance L refers to the pipe 28 and the remaining portion (that is, the cap) of the joint body 19 from the end surface on the flange 16 side of the flanged short pipe 6 in a state where the flanged short pipe 6 and the joint body 19 are joined. In this embodiment in which the protrusion 24 as shown in FIG. 3 is formed, the flanged short tube 6 and the joint body 19 are joined. In the state, it refers to the distance from the end surface of the flanged short tube 6 on the flange 16 side to the side surface on the tube portion 28 side of the protrusion 24 of the joint body 19. The distance L is set so that L = 1.1D with respect to the width (length in the axial direction) D of the cap nut 7.

  As a modification of the present embodiment, as shown in FIG. 6, the pipe portion 28 and the male screw portion 23 of the joint body 19 may be provided continuously without providing the protrusion 24 on the joint body 19. In the embodiment shown in FIG. 6, the joint portion 2 includes a joint body 19 a, a cap nut 20, and a retaining ring 21. The joint body 19a has a cylindrical shape, a distal end portion 22 provided with a tapered surface that is accommodated (fitted) in the retaining ring accommodating portion 31 of the cap nut 20 on the outer periphery of one end portion in the axial direction, and the cap nut 20 The male screw portion 23 to which the female screw portion 29 is screwed and the tube portion 28 formed at the other end in the axial direction are continuously provided, and the tube portion 28 is connected to the short tube portion 15 of the flanged short tube 6 and the socket. They are joined together by fusion. In this embodiment, in a state where the flanged short tube 6 and the joint main body 19a are joined, the distance from the end surface of the flanged short tube 6 on the flange 16 side to the boundary between the male threaded portion 23 and the pipe portion 28 of the joint main body 19a. Becomes L.

  Moreover, since the flanged short tube 6 and the joint main body 19 are formed of PP of the same material, they are completely joined together by heat welding. Examples of the heat welding method include butt fusion and welding in addition to the socket fusion of the present embodiment. In the case of butt fusion, the pipe part 28 of the joint main body 19 and the short pipe part 15 of the flanged short pipe 6 are formed into the same diameter pipe shape, the end faces are heated with a heater, and then the end faces are pressed. As a result, fusion is performed. In the case of welding, welding is performed in a state in which the pipe portion 28 and the short pipe portion 15 are fitted or the end faces are pressed.

  At this time, since the joint portion is melted and integrally formed by heat welding, the strength of the joint portion is equivalent to that of other portions, and further, the bead can be formed at the time of joining by heat welding. Thus, it is possible to prevent damage to the joint portion between the valve portion 1 and the joint portion 2 to which the stress due to the load due to the internal pressure of the fluid in the pipe line and the contraction and expansion of the pipe are applied most. In particular, among the methods of thermal welding, the socket fusion is performed by fitting the receiving portion 41 and the insertion portion 42 so that they can be integrally provided with a large area of the fusion-bonded portion. It is advantageous. In addition, since the thickness of both the receiving portion 41 and the insertion portion 42 is overlapped to form the joint portion, the thickness of the joint portion is formed thick, and high physical property strength against stress concentrated on the joint portion can be obtained. In addition, the joint portion is suitable for the internal pressure because the water pressure strength higher than that of the pipe 43 can be obtained. Further, a valve made of an olefin resin such as PP that does not have an adhesion method suitable for pipe connection is effective because the valve portion 1 and the joint portion 2 can be reliably joined together.

  In addition, when the valve part 1 and the joint part 2 are made of PVC, since the PVC can be thermally welded and can be melted and bonded using an adhesive, it is joined by thermal welding as in the present embodiment. Alternatively, the valve portion 1 and the joint portion 2 may be melted using an adhesive and integrally joined. When PVC is used, it is possible to melt the joint surfaces by applying an adhesive to the joint surfaces, and press the joint surfaces to each other so that the two members can be joined together so that the two members can be joined together. It is suitable as a joining method in the applications. Thus, when PVC is used, the joining method can be selected according to the manufacturing equipment used when assembling and the environment in which the valve is used. Moreover, PVC has the strength required as a piping member, but also has a transparent resin, so that the flow of fluid can be confirmed from the outside by using transparent PVC for the valve part 1 and the joint part 2. be able to.

  Next, a procedure for connecting a pipe to the ball valve according to the first embodiment of the present invention and its operation will be described with reference to FIGS.

  From the state before connecting the pipe 43 shown in FIGS. 1 and 3, first, the pipe 43 is inserted from the through-hole portion 33 of the cap nut 20 and passed through the inner periphery of the retaining ring 21, and then the tip of the pipe 43. The pipe 43 is inserted into the receiving portion 25 of the joint body 19 until the surface comes into contact with the step portion 27 of the receiving portion 25 of the joint body 19. At this time, the outer periphery of the pipe 43 and the inner periphery of the receiving portion 25 of the joint body 19 are fitted in a watertight state by the seal ring 26.

  Next, when the cap nut 20 is tightened to the joint body 19, the cap nut 20 is pressed with the pressing surface 35 of the end surface 22 of the joint body 19 in contact with the side surface (axial end surface) of the retaining ring 21. It is pressed to the contact surface 32 side of the through-hole portion 33. Then, the retaining ring 21 slides on the tapered surface 30 while bringing the outer peripheral surface into contact with the tapered surface 30, so that the outer peripheral surface is pressed in the axial direction by the tapered surface 30 and gradually decreases in diameter. The locking blade 34 of the retaining ring 21 is bitten into the outer peripheral surface of the pipe 43. At this time, the retaining ring 21 is sandwiched between the contact surface 32 of the cap nut 20 and the pressing surface 35 of the joint body 19, and the pipe 43 on which the retaining ring 21 is locked is a joint part of the ball valve. 2 is firmly fixed.

  Since the retaining ring 21 has its side face in contact with the pressing surface 35 of the joint body 19, the retaining ring 21 is reduced in diameter at the same position by tightening the cap nut 20 and is locked to the pipe 43. 43 is locked in place. For this reason, since a place other than the place where the retaining ring 21 is locked is not damaged, a stable seal without fluid leakage can be performed, and once the retaining ring 21 is locked to the pipe 43, the engagement is stopped. It becomes difficult to deviate from the stop position, and the pipe 43 becomes more difficult to come off from the joint portion 2. As a result, it is possible to prevent the fluid leakage from the joint portion 2 or the disconnection of the pipe 43 from being easily applied with a high internal pressure due to a water hammer phenomenon or the like when the valve is closed.

  Since the pipe 43 is connected as described above, the pipe 43 can be easily connected to the ball valve by manually rotating and tightening the cap nut 20. Thereby, when connecting a pipe made from PVC, for example, it is not necessary to use an adhesive at the construction site. As a result, it is not necessary to prepare a tool for bonding, and it is possible to connect instantly without the time required from applying the adhesive to drying. Moreover, when connecting pipes made of olefin resin such as PP, it is possible to connect without performing heat welding at the construction site. As a result, there is no need to prepare a device or power supply for heating, and there is no need to prepare a dedicated tool, device, or power supply. Is possible. In addition, construction work outdoors on a rainy day can be performed without requiring a large waterproof measure.

  Since the retaining ring 21 is reduced in diameter by tightening the cap nut 20, the inner diameter of the retaining ring 21 is made larger than the outer diameter of the pipe 43, and the retaining ring 21 scratches the outer periphery of the pipe 43 when the pipe 43 is inserted. The insertion load when the pipe 43 is inserted into the receiving port 41 can be reduced. Here, the minimum inner diameter of the retaining ring 21 is preferably set to be 0.5 mm to 3.0 mm larger than the outer diameter of the pipe 43, and 0.7 to 1.5 mm larger than the outer diameter of the pipe 43. Is more desirable. Even when the retaining ring 21 is held in the retaining ring accommodating portion 31 in a slightly inclined state, the clearance between the locking blade 34 of the retaining ring 21 and the outer peripheral surface of the pipe 43 is maintained, and the pipe 43 is inserted. In order to prevent the retaining ring 21 from abutting against the end of the pipe 43 at times and preventing the locking blade 34 from scratching the outer peripheral surface of the pipe 43, the inner diameter of the retaining ring 21 The difference from the outer diameter of the pipe 43 is preferably 0.5 mm or more. Further, in order to prevent the amount of rotation of the cap nut 20 until the retaining ring 21 is locked to the pipe 43 from increasing, and to prevent the thread width from increasing and the dimensions of the pipe joint from increasing, the retaining ring The difference between the inner diameter of 21 and the outer diameter of the pipe 43 is preferably 3.0 mm or less.

  Here, when a force in the direction of pulling out the pipe 43 is applied to the pipe 43, the retaining ring 21 is locked to the outer periphery of the pipe 43 with the locking blade 34 biting into the outer periphery of the pipe 43. When a force in the pulling direction is applied, the outer circumferential surface of the retaining ring 21 is pressed against the tapered surface 30 and a force for reducing the diameter is applied, so that the pipe 43 is prevented from coming off. At this time, a large force is applied in the direction of pulling out the pipe 43 by providing the contact surface 32 with which the side surface of the retaining ring 21 abuts in the diameter reducing direction of the tapered surface 30 of the retaining ring accommodating portion 31. Even if the retaining ring 21 has a reduced diameter and tries to bite into the pipe 43, the side surface of the retaining ring 21 abuts against the abutting surface 32 so that it does not bite beyond a certain amount of biting. For example, when only the tapered surface 30 is provided without providing the contact surface 32, a sudden internal pressure is generated in the pipe line near the valve due to contraction of the pipe in the pipe line or a water hammer phenomenon when the valve is closed. If a large force is applied in the direction in which the pipe 43 is pulled out by being applied, the retaining ring 21 may be pressed by the taper surface 30 and dig deeply into the pipe 43, and the pipe 43 may be damaged. However, the contact surface 32 is provided. As a result, the retaining ring 21 is prevented from biting deeply into the pipe 43 and the pipe 43 is prevented from being damaged. Further, the position of the contact surface 32 can be designed so that the retaining ring 21 has a good biting amount with respect to the pipe 43.

  The retaining ring 21 may be formed so as to be rotatable together with the cap nut 20. In this case, rotation of the retaining ring 21 is preferable because the locking blade 34 is easily locked to the pipe 43, and the locking position is less likely to shift. Further, instead of the locking blade 34, a cutting blade that forms a groove on the outer peripheral surface of the pipe 43 is provided on a part of the inner periphery of the retaining ring 21, and the retaining ring 21 rotates together with the cap nut 20 so that the cutting blade is a pipe. After the annular groove is formed on the outer peripheral surface of 43, the retaining ring 21 may be locked by fitting into the annular groove. As a method of rotating the retaining ring 21 together with the cap nut 20, for example, a protrusion or a straight groove is provided on the cap nut 20, and the retaining ring 21 is formed so as to be engageable with the protrusion or the linear groove.

  Next, the operation for opening and closing the ball valve according to the first embodiment of the present invention will be described.

  When the handle 12 is rotated 90 degrees from the open state shown in FIG. 1, the stem 9 fitted to the handle 12 rotates, and the valve fitted to the stem 9 as the stem 9 rotates. The body 4 rotates 90 degrees and the valve is closed (not shown). Next, when the handle is rotated backward by 90 degrees, the valve is opened (the state shown in FIG. 1) by the reverse operation.

  Since each member of the valve part 1 and the joint part 2 of the present invention is made of PP and connected to a pipe 43 made of PP, the ball valve has chemical resistance against acids and alkalis in a high temperature range. In addition, since the high temperature creep characteristics are also excellent, the ball valve of the present invention can be used for a long period of time even when a high temperature chemical is flowed as a fluid. In addition, the high temperature range in a ball valve means the range of 60 degreeC-80 degreeC on the structure of the seal | sticker of a ball valve.

  Here, a method for removing the ball valve of the present invention from the pipe and replacing the valve (the valve portion 1 excluding the flanged short pipe 6 and the cap nut 7) will be described. First, after stopping the flow of fluid on the upstream side of the pipe line, the cap nuts 7 screwed to both ends of the valve body 3 are loosened and removed from the valve body 3, and the removed cap nuts 7 are connected to the joint body 19. Are respectively moved to the tube portion 28 side (state shown in FIG. 5). From the axial end surface of the flanged short tube 6 on the flange 16 side to the side surface (FIG. 5) of the protrusion 24 on the tube portion 28 side of the joint body 19 or the boundary between the male screw portion 23 and the tube portion 28 (FIG. 6). The distance L has a relationship of L> D with respect to the width (axial length) D of the cap nut 7, and when the removed cap nut 7 separates the valve body 3 and the flanged short pipe 6. Therefore, without bending or pulling the pipe 43 and applying a load, the valve portion 1 (the flanged short tube 6 and the cap nut 7 can be attached without moving the joint portion 2 connected to the pipe 43). Can be easily removed from the pipeline. Thereafter, a new valve portion 1 (without the short tube 6 with a flange and the cap nut 7) is installed, and the short tube 6 with a flange is brought into contact with both ends of the valve body 3 through O-rings 14. A new valve portion 1 can be easily attached to the pipe by screwing the cap nut 7 to the valve body 3.

  When replacing valve parts, the replacement can be performed in the same procedure as described above. For example, when the O-ring 14 on the downstream side of the valve portion 1 is replaced, the valve main body is loosened by screwing the downstream cap nut 7 screwed to the valve main body 3 with the valve closed as described above. 3, after replacing the O-ring 14, the flanged short tube 6 is brought into contact with the end of the valve body 3 via a new O-ring 14 and the cap nut 7 is screwed onto the valve body 3. The O-ring 14 can be replaced easily and in a short time.

  From the end surface of the flanged short tube 6 on the flange 16 side to the side surface (FIG. 5) of the protrusion 24 on the tube portion 28 side of the joint portion 2 or the boundary between the male screw portion 23 and the tube portion 28 (FIG. 6). The distance L preferably has a relationship of L> D with respect to the width (axial direction length) D of the cap nut 7, and more preferably has a relationship of D <L <2D. . Even if the short nut 6 with the flange 6 and the cap nut 7 are connected to the pipe, the cap nut 7 can be removed from the valve body 3 and moved to the joint 2 side without bending or pulling the pipe. In order to be able to easily remove the valve portion (excluding the flanged short tube 6 and the cap nut 7) from the pipeline, it is necessary that L> D. Further, it is preferable that L <2D in order to make the space between the valves small and compact.

  As described above, in the valve of the present invention, the valve portion 1 and the joint portion 2 are integrally joined by heat welding so that the strength of the joint portion can be obtained. In particular, in the valve made of olefin resin, the valve portion 1 and the joint part 2 can be joined easily and reliably. In addition, when connecting the pipe 43 to the pipe, a tool, a device, a power source and the like are not required, and the connection is easy and can be performed instantaneously. Further, when replacing the valve parts, the removed cap nut 7 does not interfere with the operation of removing the flanged short tube 6 from the valve body 3, and the valve parts can be easily removed and attached. . Further, when the pipe 43 is inserted into the joint portion 2 and locked, the retaining ring 21 will not be damaged except for the portion where the retaining ring 21 is locked to the outer periphery of the pipe 43. A reliable connection can be made.

  Next, another example of the joint portion according to the second embodiment of the present invention will be described with reference to FIG.

  In the embodiment shown in FIG. 7, the joint portion 2 includes a joint body 19b, a fastening member 20b, and a retaining ring 21b.

  The joint body 19b has a receiving portion 25b into which a pipe (not shown) is inserted, and has an internal thread portion 44 and a tapered surface 45 that gradually decreases in diameter toward the inner side of the receiving portion 25b. A retaining ring housing portion 46 is formed, and a contact surface 47 with which the side surface of the retaining ring 21 b abuts is provided at an end portion of the tapered surface 45 in the diameter reducing direction in the receiving portion 25. The fastening member 20b has a through-hole portion 33b into which a pipe (not shown) is inserted at the center thereof, and a taper that is accommodated (fitted) in the retaining ring accommodating portion 46 of the joint body 19b on the outer periphery. The front end portion 48 provided with a surface, the male screw portion 49 screwed into the female screw portion 44 of the joint body 19b, and the flange portion 50 extending in the radial direction from the end portion 48 and the end opposite to the axial direction are continuous. Is provided. Since other configurations are the same as those of the first embodiment, description thereof is omitted here.

  Next, a method for connecting a pipe to the joint portion of the second embodiment of the present invention will be described.

  When a pipe (not shown) is inserted into the receiving portion 25b through the through-hole portion 33b and the fastening member 20b is tightened to the joint body 19b, the axial end surface of the distal end portion 48 of the fastening member 20b is The retaining ring 21b is pressed toward the inner side of the receiving portion 25b of the joint body 19b. Then, the retaining ring 21b gradually decreases in diameter as the tapered surface 45 slides in the axial direction. Thereby, the locking blade 34b of the retaining ring 21b bites into the outer peripheral surface of the pipe. Since other operations are the same as those in the first embodiment, description thereof is omitted here.

  As described above, the threaded portion formed at one end in the axial direction of the joint portion 2 is not the male screw portion 23 formed on the outer periphery of the receiving portion 25 but the female screw portion formed on the inner periphery of the receiving portion 25b. 44 may be provided.

  Next, a diaphragm valve according to a third embodiment of the present invention will be described with reference to FIG.

  The diaphragm valve is composed of a valve part 51 and a joint part 52. The valve unit 51 includes a valve main body 53, a diaphragm 54, a bonnet 55, a short tube 56 with a flange, and a cap nut 57.

  The valve body 53 is made of PP having a diameter of 25 mm. An opening 58 is provided on the upper surface of the valve body 53. Further, inside the valve main body 53, there are provided a first flow path 59, a second flow path 60, and a partition wall 61 that is positioned between the two flow paths and that curves the flow path toward the opening 58. A valve seat 62 is formed on the upper surface of the partition wall 61. Further, flange portions 63 are formed at both ends of the valve body 53, and male screw portions 64 are provided on the outer periphery of the flange portion 63.

  The diaphragm 54 is made of fluororubber and constitutes a valve body. An embedded metal fitting is embedded in the center of the diaphragm 54 on the non-wetted surface side with the upper portion protruding, and the diaphragm 54 is engaged and fixed to the compressor 65 by the embedded metal fitting. The peripheral edge of the diaphragm 54 is sandwiched between the valve body 53 and a bonnet 55 described later, and is crushed by the lower surface of the bonnet 55 around the opening 58 on the upper surface of the valve body 53 and fixed in a watertight state.

  In addition, examples of the material of the diaphragm 54 of the present embodiment include polytetrafluoroethylene, ethylene propylene rubber and the like in addition to the fluoro rubber, but are not particularly limited thereto.

  The bonnet 55 is made of PP, and is fixed to the upper part of the valve body 53 with bolts and nuts (not shown). A copper alloy sleeve 67 is supported in a through hole 66 in the upper center of the bonnet 55. Further, a stem 68 made of copper alloy is screwed to the female thread portion provided inside the sleeve 67, and a compressor 65 is engaged and fixed to the lower end portion of the stem 68. Further, a PP handle 69 is fitted to the upper outer peripheral portion of the sleeve 67 and disposed at the upper end of the bonnet 55.

  The flanged short tube 56 is made of PP. At one end in the axial direction of the short tube portion 70 of the short tube 56 with a flange, an annular flange portion 71 protruding outward in the radial direction is provided.

  The cap nut 57 is made from PP. The cap nut 57 has a cylindrical shape, and is provided with a female screw portion 72 that is screwed to the male screw portion 64 of the valve body 53 on the inner periphery of one end portion in the axial direction, and has a radius at the other end portion in the axial direction. An annular ridge 73 projecting inward in the direction is provided. The cap nut 57 inserts the short tube portion 70 of the flanged short tube 56 into the annular ridge 73, and the flange 71 of the flanged short tube 56 is connected to the outer end surface of the valve main body 53 via the O-ring. It is screwed to the valve body 53 in a state of being sandwiched between the inner side surfaces of the opposed annular protrusions 73.

  The joint portion 52 includes a joint body 74, a cap nut 75, and a retaining ring 76. The joint body 74 has a cylindrical shape and has a receiving portion 78 into which the pipe 77 is inserted on the inner periphery of one end portion in the axial direction. Two annular grooves are formed in parallel in the axial direction on the inner periphery of the receiving portion 78, and a seal ring 79 is disposed in each of the annular grooves. Since other configurations are the same as those of the first embodiment, description thereof is omitted here.

  The procedure for joining the valve portion 51 and the joint portion 52 of the diaphragm valve of the third embodiment of the present invention by thermal welding, the procedure for connecting the pipe 77 to the joint portion 52 and the operation thereof are described in the first embodiment. Since it is the same as that, description is abbreviate | omitted here.

  In addition, when the valve part 51 and the joint part 52 are made of PVC, PVC can be thermally welded and each member can be melted and bonded using an adhesive. The valve part 51 and the joint part 52 may be melted using an adhesive and integrally joined.

  In this embodiment, since two seal rings 79 are provided, when the pipe 77 is inserted into the receiving portion 78 of the joint main body 74, the outer periphery of the pipe 77 and the inner periphery of the receiving portion 78 of the joint main body 74 are provided. Are double sealed by two seal rings 79. As a result, even if fluid leaks from one seal ring 79, the other seal ring 79 prevents fluid leakage, so that the sealing performance can be improved and fluid leakage at the connection portion can be prevented.

  Next, the operation when opening and closing the diaphragm valve of the third embodiment of the present invention will be described.

  When the handle 69 is rotated in the closing direction (clockwise) from the fully opened state shown in FIG. 8, the stem 68 and the compressor 65 provided at the lower end of the stem 68 are lowered according to the rotation of the handle 69, and the diaphragm 54 gradually moves downward. It is curved and finally pressed against the valve seat 62 on the upper surface of the partition wall 61 of the valve body 53, the first flow path 59 and the second flow path 60 are closed, and the diaphragm valve is fully closed.

  Next, when the handle 69 is rotated in the opening direction (counterclockwise), the stem 68 and the compressor 65 provided at the lower end of the stem 68 are raised according to the rotation of the handle 69, and the diaphragm 54 is separated from the valve seat 62. It gradually curves upward and rises to the open limit position, the first flow path 59 and the second flow path 60 are opened, and the diaphragm valve is fully opened (state shown in FIG. 8).

  Since each member of the valve portion 51 and the joint portion 52 of the present invention is formed of PP and connected to a pipe 77 made of PP, the diaphragm valve has chemical resistance against acids and alkalis in a high temperature range, Excellent high temperature creep characteristics. In particular, when a diaphragm made of fluororubber is used for the diaphragm 54, the seal ring 79, or the O-ring, it can be used in ultrapure applications that hate contamination in addition to applications that have high temperature chemical resistance. In addition, the high temperature range in a diaphragm valve means the range of 60 degreeC-90 degreeC on the structure of the seal | sticker of a diaphragm valve. In addition, since the operation when the diaphragm valve of the present invention is removed from the pipe and the valve (the valve portion 51 excluding the flanged short pipe 56 and the cap nut 57) is replaced is the same as that of the first embodiment, here. Description is omitted.

  Further, as another embodiment of the present invention, the valve portion may have a gate valve configuration (not shown). In this case, the configuration and operation of the valve other than the valve portion having a gate valve structure are the same as in the first embodiment.

  Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the illustrated embodiment. The valve unit 1 of the present invention may be configured to open and close the valve by having a flow path in two directions, and has a flow path in three or more directions to open and close the valve and / or switch the flow path in communication. It may be configured. In addition, the valve body for opening / closing and switching the flow path may be rotated or moved up and down, and in the case of rotation, a ball valve configuration is preferable, and in the case of vertical movement, a diaphragm valve or a gate valve is configured. Is preferred. Further, the driving of the valve includes a manual type, an air driving type by air pressure, an electric driving type by a motor and the like, and any of them may be used without any particular limitation. In the case of the air drive type, the pneumatic drive unit is engaged with the stem 9 in place of the handle 12 and in the case of the electric drive type, the automatic drive valve is formed.

1 is a longitudinal sectional view of a ball valve showing a first embodiment of the present invention. FIG. 2 is an enlarged vertical cross-sectional view of a main part before connection between a valve portion and a joint portion in FIG. 1. It is a principal part expanded longitudinal cross-sectional view of FIG. FIG. 2 is an enlarged vertical cross-sectional view of a main part after the pipe connection in FIG. 1. It is a longitudinal cross-sectional view which shows the state decomposed | disassembled after the pipe connection of FIG. It is a principal part expanded vertical sectional view which shows embodiment when a protrusion is not provided in a coupling main body. It is a principal part expanded longitudinal cross-sectional view of the other coupling part which shows 2nd embodiment of this invention. It is a longitudinal cross-sectional view of the diaphragm valve which shows 3rd embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional ball valve. It is a longitudinal cross-sectional view which shows the conventional piping equipment for dissimilar pipe joining.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve part 2 Joint part 3 Valve main body 4 Valve body 5 Valve body presser 6 Short pipe with flange 7 Cap nut 10 Male thread part 15 Short pipe part 16 collar part 17 Female thread part 19 Joint main body 20 Cap nut 21 Stop ring 23 Male thread part 24 Projection 25 Receiving part 26 Seal ring 28 Pipe part 29 Female thread part 30 Tapered surface 31 Stop ring retaining part 35 Pressing surface 43 Pipe 51 Valve part 52 Joint part 53 Valve body 54 Diaphragm 55 Bonnet 56 Short pipe 57 Cap nut 63 Collar 64 male thread 70 short pipe 71 collar 72 female thread 74 joint body 75 cap nut 76 retaining ring 77 pipe 78 receptacle 79 seal ring

Claims (14)

A valve body having at least two connection parts for connecting pipes, a valve body for opening and closing or switching at least two flow paths communicating with the pipe body through the pipes, and a short pipe part A short tube with a flange having a flange portion extending radially outward from one end of the short tube portion, a cylindrical main body portion having a female thread portion on the inner peripheral surface, and an annular shape protruding radially inward at one end portion A cap nut having a ridge portion, and on the outer peripheral surface of the connection portion of the valve body in a state where the short tube portion of the flanged short tube is inserted inside the annular ridge portion of the cap nut. The female screw portion of the cap nut is screwed into the male screw portion provided, and the flange portion of the flanged short tube is sandwiched between the end surface of the connection portion and the annular ridge portion, thereby the flanged short portion. A valve portion fixing a pipe to the valve body;
A pipe portion to be inserted into the receiving portion is provided with a receiving portion into which a pipe is inserted at one end portion, and a tube portion to be joined to the short tube portion of the flanged short tube at the other end portion. A joint portion having an annular retaining ring for locking to
And the short pipe part of the flanged short pipe and the pipe part of the joint part are melted and integrally joined. The joint portion includes a joint body provided with a threaded portion at one end and the tube portion at the other end, and a fastening member screwed to the threaded portion,
2. The valve according to claim 1, wherein the retaining ring is reduced in diameter by being screwed to the threaded portion and is locked to the outer peripheral surface of the pipe. A male screw portion is provided on the outer periphery of one end portion of the joint body as the screwing portion, and a female screw portion that is screwed into the male screw portion of the joint main body inside the fastening member, and is continuous with the female screw portion. A retaining ring accommodating portion that accommodates the retaining ring in a state in which an axial end surface of the retaining ring is in contact with an end surface of one end portion of the joint body;
The inner periphery of the retaining ring housing portion has a tapered surface that gradually decreases in diameter in a direction away from the female thread portion of the fastening member, and the outer periphery of the retaining ring is the tapered surface of the inner periphery of the retaining ring housing portion. The valve according to claim 2, wherein the valve has a tapered surface that is slidably in contact with the valve.   The valve according to claim 2 or 3, wherein the retaining ring has an inner diameter that is 0.5 to 3 mm larger than an outer diameter of the pipe.   The valve according to any one of claims 2 to 4, wherein the retaining ring is rotatable with the fastening member.   The outer diameter of the pipe part of the joint part is smaller than the inner diameter of the annular ridge part of the cap nut, and the pipe part and the remaining part of the joint part from the end face on the flange part side of the flanged short pipe The valve according to any one of claims 1 to 5, wherein a distance to the boundary is larger than an axial length of the cap nut.   A protrusion having a diameter larger than that of the pipe part is provided at the boundary between the pipe part and the remaining part in the joint part, and the pipe part of the joint part from an end surface on the flange side of the flanged short pipe The valve according to any one of claims 1 to 6, wherein a distance to a side surface of the protrusion on the side is larger than an axial length of the cap nut.   The valve according to any one of claims 1 to 7, wherein the valve portion and the joint portion are formed of an olefin resin.   The valve according to claim 8, wherein the valve portion and the joint portion are made of polypropylene.   A receiving portion is formed in the short tube portion of the flanged short tube, and an insertion portion that can be fitted in the receiving portion of the short tube portion is formed in the tube portion of the joint portion. The valve according to any one of claims 1 to 9, wherein the receiving portion and the insertion portion of the tube portion are joined by socket fusion.   The valve portion and the joint portion are formed of vinyl chloride resin, and a receiving portion is formed in the short tube portion of the flanged short tube, and the receiving portion of the short tube portion is formed in the tube portion of the joint portion. The insertion part which can be fitted in a part is formed, and the receiving part of the said short pipe part and the insertion part of the said pipe part are joined by adhesion | attachment by an adhesive agent. The described valve.   The valve according to any one of claims 1 to 11, wherein at least two seal rings are arranged on an inner periphery of a receiving portion of the joint portion.   The valve according to any one of claims 1 to 12, wherein the valve portion is any one of a ball valve, a diaphragm valve, and a gate valve.   The valve according to any one of claims 1 to 13, wherein the valve body is driven by any one of a manual type, a pneumatic type, and an electric type.

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