JP4194527B2 - Titanium ball valve - Google Patents

Description

  The present invention relates to a ball valve using a titanium alloy for a fluid contact portion.

  In general, titanium ball valves have the advantage of being able to handle a wide range of corrosive liquids and gases, including acids and alkalis, due to the excellent chemical stability of titanium alloys, but titanium alloys are very expensive. Therefore, it is common to use a titanium alloy only for the fluid contact portion and to use an inexpensive material such as stainless steel or a steel material for other portions such as the flange portion. However, titanium alloys can be welded together but cannot be welded to other materials, so when using a non-titanium alloy for the flange, a loose flange using a lap joint (also called a stub end) method has been used. ing.

  FIG. 10 is a cross-sectional view showing a typical titanium ball valve in the prior art. In the figure, a portion made of a titanium alloy is represented by a dotted pear-like cross section. As shown in the figure, this titanium ball valve has a body cap side flange 43 at the flange connecting portion between the body main body 41 and the body cap 42 constituting the valve chamber 40, and pipes provided at the distal ends of the fluid inlet / outlet pipes 44 and 45. An independent ring member made of a non-titanium alloy is used for the connecting flanges 46 and 47. These ring members are loosely fitted to the fluid inlet / outlet pipes 44 and 45 as loose flanges, and the flange 43 has a flange made of titanium alloy by a cap ring 48 welded to the base end of the fluid inlet / outlet pipe 44. In 46 and 47, the ring-shaped flange face seats 49 and 50 made of titanium alloy welded to the tips of the fluid inlet / outlet pipes 44 and 45 respectively receive the tightening force at the time of connection with bolts.

  In FIG. 10, 51 is a ball-shaped valve body provided with a through-flow passage 51 a, 52 and 53 are ring-shaped ball seats forming a valve seat, and 54 is a valve rod whose lower end is engaged with the ball-shaped valve body 51. , 55 is a packing interposed between the valve stem holding cylinder 41a of the body main body 41 and the valve stem 54, 56 is a packing presser ring that is externally fitted to the valve stem 54, and 57 is screwed into the valve stem 54 to be packed. A tightening nut 58 that presses the presser ring 56 against the packing 55, 58 is an opening / closing operation handle attached to the outer end of the valve stem 54.

  However, in the conventional titanium ball valve, the strength of the welded portion between the lap joint pipe parts (fluid inlet / outlet pipes 44 and 45) and the flange parts (ring-shaped flange face seats 49 and 50) is poor, so that the valve can be opened and closed. When the accompanying water hammer (water hammer) occurs and a large pressure is applied to the loose flange portion in the direction of separation, there is a problem that the welded portion of the lap joint is easily damaged.

  In view of the above circumstances, the present invention uses a titanium alloy only for a fluid contact portion as a titanium ball valve, and a flange on the body cap side at the flange connection portion between the body main body and the body cap, or the tip of the fluid inlet / outlet conduit In a configuration using a non-titanium alloy for the pipe connection flanges of the parts, even if a large pressure is applied to the flange connection parts by water hammer accompanying opening and closing of the valve, it is difficult to break, and has excellent strength and durability. It is an object.

  In order to achieve the above object, the invention according to claim 1 is a ball valve using a titanium alloy for a fluid contact portion, and a body main body 1 and a body constituting a valve chamber 10 in a ball valve using a titanium alloy as a fluid contact portion. A non-titanium alloy in which at least the body cap side flange 3 and the flanges 6 and 7 for pipe connection provided at the tip ends of the fluid inlet / outlet pipes 4 and 5 in the flange connection portion with the cap 2 are engraved with an internal thread 8a on the inner periphery. The ring member is formed on the outer peripheral portion of each pipe portion (fluid inlet / outlet pipes 4, 5 and ball sheet receiving member 9) made of a titanium alloy forming the flanges 3, 6, and 7 and engraved with the male screw 8b. Is characterized by being externally screwed.

  According to a second aspect of the present invention, in the titanium ball valve according to the first aspect, a titanium alloy valve rod holding cylinder 11 projects from the body body 1, and the inner circumference of the valve rod holding cylinder 11 and the valve rod 12 are A packing 13 is interposed between the outer periphery and a ring member made of a non-titanium alloy having a female screw 8a on the inner periphery is screwed to the outer peripheral portion of the valve stem holding cylinder 11 on which the male screw 8b is formed. A non-titanium alloy ring-shaped pressing member 15 that constitutes a pressing mounting flange 14 and presses the packing 13 from the outside in the axial direction is externally fitted to the outward projecting portion 12a of the valve stem 12, and the pressing mounting flange 14 It is supposed to be bolted to.

  According to a third aspect of the present invention, in the titanium ball valve according to the first or second aspect, the one end side 16a of the cylindrical body member 16 made of a titanium alloy constituting the valve chamber outer shell of the body body 1 is reduced in diameter. A ball sheet receiving member 17 having a substantially L-shaped cross section made of a titanium alloy is fitted into the opening of the reduced one end side 16a and welded at the fitting portion.

  The invention of claim 4 is the titanium ball valve according to any one of claims 1 to 3, wherein the body main body side flange 18 in the flange connecting portion between the body main body 1 and the body cap 2 is made of a titanium alloy ring member, This ring member is welded to a cylindrical body member 16 made of a titanium alloy that constitutes the valve chamber outer shell of the body body 1.

  In the titanium ball valve according to the first aspect of the present invention, the body cap side flange in the flange connecting portion between the body main body and the body cap, and the pipe connecting flange provided at the tip of the fluid inlet / outlet pipe are made of a non-titanium alloy ring member. However, since the inner circumference of these ring members is screwed to the outer circumference of the titanium alloy pipe, the non-titanium alloy flange is firmly supported by the pipe, and the flange connection part opens and closes the valve. Even if a large pressure in the separation / contact direction is applied due to the water hammer accompanying this, since this pressure is received by the entire screwed portion by the screw, breakage at the flange connecting portion is prevented, thereby exhibiting excellent durability.

  According to the second aspect of the present invention, a ring member made of a non-titanium alloy is screwed onto the outer periphery of the valve stem holding cylinder of the body body as a presser mounting flange, and is interposed between the inner circumference of the valve stem holding cylinder and the valve stem. Since the ring-shaped pressing member that holds the mounted packing is bolted to the pressing mounting flange, the sealing structure of the valve stem insertion portion in the body body is simple and easy to assemble, and it is not attached to the pressing mounting flange. Since the titanium alloy is used, the amount of the expensive titanium alloy used is reduced and it is economical, and the mounting strength of the pressing mounting flange can be sufficiently secured.

  According to the third aspect of the present invention, an L-shaped ring-shaped ball seat receiver made of a titanium alloy is provided in the opening on the one end side of the cylindrical body member made of a titanium alloy constituting the valve chamber outer shell of the body main body. Since the members are fitted and welded, one ball seat side of the valve chamber outer shell becomes a concave curved surface, increasing the pressure resistance and reducing the thickness of the ball seat receiving member. It is economical because the amount is small.

  According to the invention of claim 4, the body main body side flange in the flange connecting portion between the body main body and the body cap and the cylindrical body constituting the valve chamber outer shell of the body main body are made as separate members made of titanium alloy. Since both the members are welded to each other, both members can be easily and inexpensively manufactured by press-forming a titanium alloy tube or plate.

  Hereinafter, an embodiment of a titanium ball valve according to the present invention will be specifically described with reference to the drawings. In FIGS. 1 to 5 and FIG. 7, a portion made of a titanium alloy is represented by a dotted cross-shaped cross section.

  As shown in FIG. 1, this titanium ball valve has fluid inlet / outlet pipes 4, 5 concentrically projecting on both sides of a valve chamber 10, and opening portions facing both fluid inlet / outlet pipes 4, 5 of the valve chamber 10. Ball seats 19 and 20 made of a ring-shaped fluorine-based resin or the like forming a valve seat on the periphery are fitted, and a ball-shaped valve body 21 having a through channel 21 a in the valve chamber 10 is formed on both ball seats 19. , 20 is loaded in close contact with the engagement recess 21b provided on the outer peripheral surface of the ball-shaped valve body 21 from the outside into the valve chamber 10 in a direction perpendicular to the axial center direction of the fluid inlet / outlet pipes 4, 5. By the operation of an opening / closing operation handle (not shown in the figure, similar to the opening / closing operation handle 58 in FIG. 10) engaged with the non-circular tip 12 b of the valve rod 12 that has entered and fixed to the outer end of the valve rod 12. The valve body 21 rotates, and the through flow passage 21a is formed between the fluid inlet / outlet pipes 4 and 4. It has an open position which communicates coaxially, to be switched into a blocking position with different angular 90 ° orientation relative to the open position.

  The valve chamber 10 is divided into a body body 1 and a body cap 2 that are open to one side in order to load the ball-shaped valve body 21 therein, and after the ball-shaped valve body 21 is loaded, The body main body side flange 18 and the body cap side flange 3 provided on the outer peripheral edge of the open portion 1 are fastened by the fastening bolts 23 through the packing 22 so that both 1 and 2 are connected. Yes. The body cap side flange 3 has a plurality of bolt insertion holes 3a... And the body main body side flange 18 has a plurality of screw holes 18a. Is provided. Thus, one fluid inlet / outlet pipe 4 is integrated with the body main body 1, and the other fluid inlet / outlet pipe 5 is integrated with the body cap 2, so that the entire valve casing is a single casing body 24. And a socket 25.

  Pipe connecting flanges 6 and 7 having bolt insertion holes 6a and 7a at regular intervals along the circumferential direction on the outer circumferences of the front end portions of both fluid inlet / outlet pipes 4 and 5, and the front end side of these flanges 6 and 7 The ring-shaped flange face seats 26 and 27 are provided so that the front face is flush with the end faces of the fluid inlet / outlet pipes 4 and 5. On the other hand, the body main body 1 is provided with a valve stem holding cylinder 11 that projects the valve stem 12 rotatably, and a pressing attachment flange 14 is provided on the outer periphery of the tip of the valve stem holding cylinder 11. A packing 13 is interposed between the inner periphery of the valve stem holding cylinder 11 and the outer periphery of the valve stem 12, and a ring-shaped pressing member 15 is fitted on the outward projecting portion 12 a of the valve rod 12 to attach the presser. It is fixed to the flange member 14 with mounting bolts 28, 28.

  Here, the body main body 1, the body cap 2, the fluid inlet / outlet pipes 4 and 5, the valve rod holding cylinder 11, the body main body side flange 18, the ball-shaped valve element 21, and the ring-shaped flange face seats 26 and 27 are all made of titanium alloy. It is composed of. On the other hand, the body cap side flange 3, the pipe connecting flanges 6 and 7, the presser mounting flange 14, and the ring-shaped presser member 15 are all made of a non-titanium alloy such as stainless steel or steel material.

  The body cap side flange 3, the pipe connecting flanges 6 and 7, and the presser mounting flange 14 made of a non-titanium alloy are made of a titanium alloy pipe portion, that is, a body cap 2, and fluid inlet / outlet pipes 4 and 5. Although it cannot be welded to the valve stem holding cylinder 11, as shown in FIGS. 1, 3, 5, and 9, a female screw 8 a is provided on the inner periphery of the ring member used for forming each flange, while the other side By providing a male screw 8b on the outer periphery of the pipe part (2, 4, 5, 11), the male screw 8b and the female screw 8a are screwed into the pipe part (2, 4, 5, 11). Yes.

  As shown in FIG. 2, the casing body 24 includes a body body side flange 18 provided with screw holes 18 a... At a predetermined interval along the circumferential direction, a cylindrical body member 16 that constitutes an outline of the valve chamber 10, A ring-shaped ball seat receiving member 17 having a substantially L-shaped cross section, a fluid inlet / outlet pipe 4 provided with an external thread 8b on the outer periphery, a pipe connecting flange 6, a ring-shaped flange face seat 26, a valve stem holding cylinder 11, a presser mounting flange 14 ( (See FIG. 3). The titanium alloy members (18, 16, 17, 4, 26) are manufactured by press molding from titanium alloy pipes and plates, and the main body of the casing body 24 is welded to each other as shown in FIG. Forming part. However, as shown in FIG. 3, the ring-shaped flange face seat 26 is welded to the tip of the fluid inlet / outlet pipe 4 after the pipe connecting flange 6 is screwed to the fluid inlet / outlet pipe 4. Further, the cylindrical body member 16 has one end side 16a whose diameter is reduced to an outwardly convex round shape. The ball seat receiving member 17 is fitted into the opening of the one end side 16a, and the fitting portion is welded. is doing.

  As shown in FIGS. 4 and 5, the presser mounting flange 14 has a substantially rhombus in plan view, and has screw holes 14 a at two locations on both sides of the long diameter portion. The body main body side flange 18 and the body cap side flange 3 do not interfere with each other when the presser mounting flange 14 is screwed to the valve stem holding cylinder 11, as shown in FIGS. A part of the outer periphery is cut along the tangential direction. Further, as shown in FIGS. 7A and 7B, the ring-shaped pressing member 15 is substantially rhombus in plan view corresponding to the pressing mounting flange 14, and has bolt insertion holes 15a at two locations on both sides of the long diameter portion. In addition, an annular convex portion 15b for pressing is provided on the lower surface side.

  On the other hand, as shown in FIG. 8, the socket 25 has a ring-shaped flange face seat 29 on the cap side having an annular concave step portion 29 a for packing fitting on the periphery of the side surface of the valve chamber 10 and constituting one side wall of the valve chamber. A ball seat receiving member 9 having a substantially L-shaped ring shape with a male screw 8b engraved on the body, a body cap side flange 3, a fluid inlet / outlet pipe 5 provided with a male screw 8b on one end (tip) side outer periphery, a pipe connecting flange 7, and a pipe It consists of each member of the ring-shaped flange face seat 27 on the connection side. The titanium alloy members (29, 9, 5, 27) are manufactured by press molding from titanium alloy pipes and plates, and form the main part of the socket 25 by mutual welding as shown in FIG. The ring-shaped flange face seat 29 and the ball seat receiving member 9 constitute the body cap 2. As shown in FIG. 9, the ring-shaped flange face seat 27 on the pipe connection side is welded to the tip of the fluid inlet / outlet pipe 5 after the body cap side flange 3 and the pipe connection flange 6 are screwed together.

  The ball-shaped valve body 21 is prepared by welding two hemispherical bodies obtained by pressing a disk-shaped titanium alloy sheet to produce a spherical shell, drilling the spherical shell, The titanium alloy pipe constituting the path 21 is inserted, and the engaging recess 21b forming member obtained by pressing the titanium alloy sheet is fitted, the joint portion between these members is welded, and distortion is caused by heat treatment. It is manufactured after finishing by cutting and polishing.

  In the titanium ball valve configured as described above, the use of a non-titanium alloy for the body cap side flange 3 and the pipe connecting flanges 6 and 7 reduces the amount of expensive titanium alloy used and reduces the material cost. These flanges 3, 6, and 7 are not loose flanges as in the prior art, but are screwed between a female screw 8 a provided on the inner periphery of these ring members and a male screw 8 b provided on the outer periphery on the tube side forming the flange. As a result, it is screwed into the tube side and is firmly supported. Therefore, even if a large pressure in the direction of separation is applied to the flange connecting portion due to water hammer accompanying opening and closing of the valve, this pressure is received by the entire screwed portion by the screw, so that damage at the flange connecting portion is prevented. Excellent durability as a titanium ball valve can be obtained only in the fluid contact portion.

  Further, in this embodiment, a pressing attachment flange 14 is provided on the outer periphery of the valve stem holding cylinder 11 of the body body 1, and the packing 13 interposed between the inner circumference of the valve stem holding cylinder 11 and the valve stem 12 is provided. Since the ring-shaped pressing member 15 to be pressed is bolted to the pressing mounting flange 14, the sealing structure of the valve rod insertion portion in the body body 1 is simple and easy to assemble, and the pressing mounting flange 14 is made of a non-titanium alloy. The ring member is used, and the ring member is screwed onto the valve stem holding cylinder 11 made of a titanium alloy with a screw. Therefore, the amount of expensive titanium alloy used is reduced and economical. There is an advantage that the mounting strength of the mounting flange 14 can be sufficiently secured.

  Further, one end side 16a of a cylindrical body member 16 made of a titanium alloy constituting the valve chamber outer shell of the body body 1 is reduced in diameter, and an L-shaped ring-shaped ball seat also made of a titanium alloy is formed in the opening of the one end side 16a. Since the receiving member 17 is fitted and this fitting portion is welded, one ball seat 19 side of the valve chamber outer shell is formed into a concave curved surface shape to increase the pressure resistance, and the ball seat receiving member 17 is made thin. Therefore, it is economical because the amount of expensive titanium alloy used is reduced, and the usage mode in which the fluid inlet / outlet pipe 5 is on the upper side has an advantage that a liquid pool is hardly generated in the valve chamber 10. Moreover, since the body main body side flange 18 of the body main body 1 and the cylindrical trunk | casing part which comprises a valve chamber outer shell are set as another member made from a titanium alloy, it is set as the structure welded mutually, both members are pipe materials made from a titanium alloy, It can be easily and inexpensively manufactured by press molding of a plate material.

  In the present invention, for example, the body main body side flange 18 of the body main body 1 is constituted by a ring member made of a non-titanium alloy having an internal thread on the inner periphery, similar to the body cap side flange 3, and the cylindrical body It is good also as a structure screwed in the external thread provided in the outer periphery of the member 16. FIG. In addition, the detailed configuration of the titanium ball valve of the present invention can be variously modified in addition to the embodiment.

It is a vertical side view of the titanium ball valve concerning one embodiment of the present invention. It is a vertical side view which decomposes | disassembles and shows the casing main body in the ball valve to a structural member. It is a partially broken side view which shows the attachment operation of the flange for piping connection in the same casing main body, and the flange for pressing attachment. It is a top view of the flange part for pressing attachment of the casing main body. It is a half section front view of the casing body. It is a front view of the body cap side flange of the ball valve. The ring shaped pressing member used for the ball valve is shown, (A) is a plan view, (B) is a radial longitudinal sectional view. It is a vertical side view which decomposes | disassembles and shows the socket in the same ball valve to a structural member. It is a partially broken side view which shows attachment operation of the flange for piping connection in the same socket, and a body cap side flange. It is a vertical side view which shows the structural example of the conventional titanium ball valve.

Explanation of symbols

1 Body body 2 Body cap 3 Body cap side flange 4, 5 Fluid inlet / outlet pipe (pipe part)
6, 7 Flange for pipe connection 8a Female thread 8b Male thread 9 Ball seat receiving member (pipe part)
DESCRIPTION OF SYMBOLS 10 Valve chamber 11 Valve rod holding cylinder 12 Valve rod 12a Outward protrusion 13 Packing 14 Pressing attachment flange 15 Ring-shaped holding member 16 Cylindrical body member 16a One end side 17 Ball seat receiving member 18 Body body side flange

Claims (4)

In ball valve using titanium alloy for fluid contact part,
Non-titanium alloy in which at least the body cap side flange at the flange connection between the body body and the body cap constituting the valve chamber, and the pipe connection flange provided at the tip of the fluid inlet / outlet pipe are internally threaded Made of ring members,
A titanium ball valve characterized in that the ring member is externally screwed to an outer peripheral portion in which a male thread of each pipe portion made of a titanium alloy forming a flange is engraved.   A titanium alloy valve stem holding cylinder protrudes from the body body, and a packing is interposed between the inner circumference of the valve stem holding cylinder and the outer circumference of the valve stem, and the male thread of the valve stem holding cylinder is engraved. A non-titanium alloy ring-shaped pressing member that presses the packing from the outside in the axial direction is formed by screwing a non-titanium alloy ring member having a female thread engraved on the inner periphery to the outer peripheral portion. The titanium ball valve according to claim 1, wherein the titanium ball valve is externally fitted to an outward projecting portion of the valve stem and is bolted to the presser mounting flange.   One end side of a cylindrical body member made of a titanium alloy constituting the valve chamber outer shell of the body body is reduced in diameter, and a ring-shaped ball seat receiver having a substantially L-shaped cross section made of a titanium alloy is formed in an opening on the reduced diameter end side. The titanium ball valve according to claim 1 or 2, wherein the member is fitted and welded at the fitting portion. The body body side flange at the flange connecting portion between the body body and the body cap is made of a titanium alloy ring member, and this flange member and a cylindrical body member made of titanium alloy constituting the valve chamber outer shell of the body body are welded. The titanium ball valve according to any one of claims 1 to 3.

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