JP2011256899A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a liquid pool around a through-hole even when a seat ring has a two-division structure.SOLUTION: This ball valve includes: a spherical valve element 7 rotated around an axis A, having an internal passage 7c and provided, on an outer surface 7g, with openings 7d, 7e communicating with the inner passage 7c; a seat ring 5 rotatably supporting the valve element 7 with a wall part 5b surrounding an inner cavity 5a for entering the valve element 7 therein, and including respective through-holes 5d, 5e, 5f at positions of the wall part 5b related to the openings 7d, 7e of the valve element 7; and a case 3 with a lid used for housing the valve element 7 therein by interposing the seat ring 5 and including flow holes 3d, 3e, 3f located at positions corresponding to the through-holes 5d, 5e, 5f and communicating with the through-holes; wherein the wall part 5b of the seat ring 5 is divided into two to avoid the through-holes 5d, 5e, 5f and pass obliquely across lines passing through centers of the through-holes 5d, 5e, 5f, and endless ferrule packing 5h is interposed to surround the outside of the inner cavity 5a between butt surfaces 5b3, 5b4 of both divided wall parts 5b1, 5b2.

Description

  The present invention relates to a ball valve used for controlling the flow of fluids such as cosmetics and foods, and more particularly to a sanitary ball valve that has no liquid pool and is easy to clean.

  As the ball valve described above, the outside of the spherical valve body is surrounded by a case with a lid through a seat ring that can be divided into two parts, and the seat ring is taken out from the case by removing the cover and divided into two parts Thus, there is known one that can be detached and disassembled from the inside of the seat ring (see, for example, Patent Document 1). In addition, it can assemble by performing operation reverse to the operation mentioned above.

Japanese Utility Model Publication No.59-16603

  By the way, the seat ring in the technique of the above-mentioned patent document 1 is provided with through holes at a plurality of positions through which end portions of passages provided in a valve body that is rotationally driven around an axial center, and the through holes are divided into divided lines. It is divided into two so as to pass.

  Therefore, in the case of the technique disclosed in Patent Document 1, it is inappropriate to use an annular seal member even if the split surface of the seat ring is sealed with a seal member such as packing. Since the split surface of the seat ring and the end of the seal member are exposed on the inner peripheral surface, sufficient sealing performance cannot be ensured, and there is a possibility that a liquid pool may occur around the through hole. .

  The present invention has been made to solve the above-described problems of the prior art, and a ball valve capable of preventing the occurrence of a liquid pool around a through hole even when the seat ring has a two-part structure. The purpose is to provide.

  The present invention surrounds a spherical valve body rotated about a predetermined axis, having an internal passage and having a plurality of openings on the outer surface thereof communicating with the internal passage, and an internal cavity into which the valve body enters. The valve body is rotatably supported by a wall portion, and a seat ring having a through hole at a position related to the opening in the valve body of the wall portion, and the valve body is accommodated via the seat ring. And a case with a lid having a through hole communicating with the through hole at a position corresponding to the through hole, and the seat ring diagonally avoids the through hole and passes through the center of the through hole. The wall portion is divided in two so as to cross the wall, and an endless annular seal member is interposed between the butted surfaces of the divided wall portions so as to surround the outside of the internal cavity. And In the case of the present invention, the wall portion is divided into two so that the seat ring avoids the through hole and obliquely crosses the straight line passing through the center of the through hole, and the interior is between the butted surfaces of the divided wall portions. Since an endless annular seal member is interposed so as to surround the outside of the cavity, the split surface of the seat ring and the end of the seal member are not exposed to the inner peripheral surface of the through hole as in the conventional case, and the through hole is penetrated. Occurrence of a liquid pool around the hole can be prevented.

  In this configuration, the annular seal member has protrusions on both sides of the annular seal member, and the inner plate part is thicker than the protrusions than the protrusions. Is preferably used. In this configuration, it is possible to seal from a position inside the protrusion, and the sealing performance can be improved.

  In this configuration, the seat ring has a through hole formed between a portion in the axial direction of the valve body and two symmetrical portions on the inner circumferential surface farthest from the shaft center and sandwiching the center of the valve body. And a through-hole in the axial direction portion and one through-hole in the two symmetric portions are disposed in one wall portion divided into two, and the two symmetric portion portions are disposed in the other wall portion. The other through hole may be provided. Even in this configuration, the split surface of the seat ring and the end of the seal member are not exposed to the inner peripheral surface of the through hole as in the prior art, and the occurrence of liquid pool around the through hole is prevented. Can do.

  In this configuration, the seat ring is provided with the through-hole in a part in the axial direction of the valve body and one part on the inner peripheral surface farthest from the axis, and one wall divided into two One through hole may be disposed in the portion, and the other through hole may be disposed in the other wall portion. Even in this configuration, the split surface of the seat ring and the end of the seal member are not exposed to the inner peripheral surface of the through hole as in the prior art, and the occurrence of liquid pool around the through hole is prevented. Can do.

  In this configuration, the seat ring is provided on the inner circumferential surface farthest from the axis and is provided with two through-holes in two symmetrical portions sandwiching the center of the valve body, and is divided into two wall portions. One through-hole of the two symmetric portions may be disposed on the other wall portion, and the other through-hole of the two symmetric portions may be disposed on the other wall portion. Even in this configuration, the split surface of the seat ring and the end of the seal member are not exposed to the inner peripheral surface of the through hole as in the prior art, and the occurrence of liquid pool around the through hole is prevented. Can do.

  In this configuration, the valve body is formed with a projecting portion that is detachably connected to a valve rod for driving the valve body to rotate about the axis, and is formed to protrude outward. The ring may be provided with a protrusion insertion hole into which the protrusion is inserted, and the abutting surface may be formed so as to pass through a position avoiding the protrusion insertion hole. In this configuration, even if the seat ring is provided with a protrusion insertion hole into which the protrusion provided on the valve body is inserted so as to be connected to the valve stem, the position where the butted surface avoids the protrusion insertion hole Therefore, the split surface of the seat ring and the end of the seal member are not exposed on the inner peripheral surface of the protrusion insertion hole, and the occurrence of liquid pool around the protrusion insertion hole can be prevented.

  In this configuration, an endless annular seal member can be disposed between the outer peripheral surface of the protrusion and the inner peripheral surface of the protrusion insertion hole. In this configuration, the gap between the outer peripheral surface of the protrusion and the inner peripheral surface of the protrusion insertion hole is sealed by an endless annular seal member, so that a liquid pool is generated around the protrusion insertion hole. Can be prevented.

  In this configuration, the peripheral edge portion of the through hole and the peripheral edge portion of the flow-through hole are abutted with each other, and an endless annular seal member can be interposed between the peripheral edge portions. In the case of this configuration, it is possible to prevent a liquid pool from being generated between the seat ring and the case.

  In this configuration, a taper may be provided on the distal end side of the protruding portion so that the valve element can be inserted into the divided wall portion having the protruding portion insertion hole.

  In this configuration, the through hole and the flow hole have an inner peripheral surface having the same dimension, the annular seal member is a ferrule packing, and the inner diameter thereof is formed to be the same as the dimension. Good. In this case, since the inner diameter of the through hole, the inner diameter of the flow hole, and the inner diameter of the ferrule packing are substantially the same, unevenness is eliminated at the abutting portion between the peripheral edge portion of the through hole and the peripheral edge portion of the flow hole. Therefore, it is possible to prevent the occurrence of liquid pool.

  In the case of the present invention, the wall portion is divided into two so that the seat ring avoids the through hole and obliquely crosses the straight line passing through the center of the through hole, and the interior is between the butted surfaces of the divided wall portions. Since an endless annular seal member is interposed so as to surround the outside of the cavity, the split surface of the seat ring and the end of the seal member are not exposed to the inner peripheral surface of the through hole as in the conventional case, and the through hole is penetrated. Occurrence of a liquid pool around the hole can be prevented.

It is front sectional drawing which shows the ball valve which concerns on one Embodiment of this invention. It is a right view of FIG. It is a top view of FIG. It is an exploded view of the ball valve shown in FIG. It is an exploded view of the drive system which rotates a valve body. (A) is a front view which shows a valve body, (b) is a left view of (a), (c) is a top view of (b). (A) is a front view showing a seat ring, (b) is a left side view of (a), and (c) is a bottom view of (a). It is sectional drawing which shows packing. It is a front view which shows a ferrule packing. (A) is a front view showing a handle, (b) is a plan view thereof, (c) is a left side view showing a base end portion of the handle, and (d) is a bottom view showing a base end portion of the handle. (A) is a front view showing a valve stem, (b) is a left side view thereof, (c) is a plan view showing an upper end portion of (b), and (d) shows a lower end portion of (b). It is a bottom view. (A) is a front view which shows a joint, (b) is a left view, (c) is a top view of (b). (A) is front sectional drawing which shows an upper side stopper (sectional drawing by CC line of (b)), (b) is the top view. It is front sectional drawing which shows the two-way ball valve which concerns on other embodiment of this invention. (A) is a front view which shows the valve body used for the ball valve of FIG. 14, (b) is a left view of (a), (c) is a top view of (b). (A) is a front view showing a seat ring used for the ball valve of FIG. 14, (b) is a left side view of (a), and (c) is a plan view of (b). (A) is front sectional drawing which shows an upper side stopper (sectional drawing by the DD line of (b)), (b) is the top view.

  Embodiments of the present invention will be specifically described below.

  1 is a front sectional view showing a ball valve according to an embodiment of the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a plan view thereof, FIG. 4 is an exploded view of the ball valve shown in FIG. It is an exploded view of the drive system which rotates a valve body.

  The ball valve 1 includes a case 3 with a lid, a spherical valve body 7 provided inside the case 3 with a seat ring 5 interposed therebetween, and a handle 9 for rotationally driving the valve body 7. And a valve stem 11 attached to the handle 9 and detachably connected to the valve body 7. The ball valve 1 of this embodiment is a three-way ball valve.

  6 (a) is a front view (partially broken) showing the valve body 7, FIG. 6 (b) is a left side view of FIG. 6 (a), and FIG. 6 (c) is a plan view of FIG. 6 (b). is there.

  The valve body 7 is made of, for example, stainless steel, and is rotated around a predetermined axis A as the handle 9 is operated. In the direction of the axis A and on the side where the valve stem 11 is provided, a protruding portion 7a is provided that protrudes outward. The projecting portion 7a has a base-side annular groove 7a1 and a truncated cone portion 7a2 which is provided on the tip side of the annular groove 7a1 and gradually decreases in outer diameter as it approaches the tip. A connecting portion 7b to which the end portion 11a of the valve stem 11 is detachably connected is provided on the end surface (upper surface) on the distal end side of the base portion 7a2. As the connecting portion 7b, for example, a umbilical groove having a certain width is formed. Further, the annular groove 7a1 is provided with an O-ring 7i (see FIG. 1).

  The valve body 7 is provided with an internal passage 7c whose center is bent in an L-shape, and a plurality of, in the illustrated example, two openings 7d and 7e are provided on the outer surface 7g communicating with the internal passage 7c. These openings 7d and 7e have a circular periphery and are oriented in different directions at an angle of 90 °. The outer surface 7g is formed in a spherical shape excluding the portion where the protrusion 7a is formed and the portions where the openings 7d and 7e are formed.

  A downward opening 7d provided in the direction of the axis A and on the opposite side of the projection 7a is used as a fluid inlet, and the other lateral opening 7e is an inner circumference farthest from the axis A. It is formed to have a center on the surface and is used as an outlet. The opening 7e rotates in the same manner as the valve body 7 rotates about the axis A.

  7A is a front view (sectional view) showing the seat ring 5, FIG. 7B is a left side view of FIG. 7A, and FIG. 7C is a bottom view of FIG. 7A. .

  The seat ring 5 is made of, for example, a fluororesin, and supports the valve body 7 in a rotatable manner by a wall portion 5b surrounding the internal cavity 5a in which the valve body 7 enters, and the wall portion 5b in the valve body 7 is supported. Through holes 5d, 5e, and 5f are provided at positions related to the openings 7d and 7e, respectively. Specifically, the through-hole 5d is provided at a position corresponding to the opening 7d, and the through-hole 5e and the through-hole 5f are positions corresponding to the trajectory where the opening 7e rotates and are symmetrical with respect to the axis A. Is provided. In addition, the through-holes 5d, 5e, and 5f have an inner peripheral surface formed in a circular shape in the present embodiment, for example. Further, the inner surface of the wall portion 5b is formed into a spherical surface corresponding to the spherical outer surface of the valve body 7 so that no liquid pool is generated or hardly generated between the wall portion 5b and the valve body 7. It has become.

  Further, the seat ring 5 is formed with a protrusion insertion hole 5g into which the protrusion 7a is inserted. The protrusion insertion hole 5g has an inner diameter slightly smaller than the outer diameter of the O-ring 7i provided in the annular groove 7a1, and is sealed by the O-ring 7i as the protrusion 7a is inserted.

  The wall part 5b is divided into two parts, and has a first wall part 5b1 and a second wall part 5b2. Between the butted surfaces 5b3 and 5b4 of the first wall part 5b1 and the second wall part 5b2 An endless annular seal member, for example, a ferrule packing 5h is interposed (see FIG. 9). The ferrule packing 5h is made of, for example, a fluororesin, and has projections, for example, projections 5h1 and 5h2 having a semicircular cross section, on the both sides in the thickness direction of the annular plate 5h3, and located on the inner side of the projections 5h1 and 5h2. The thickness t2 of the plate portion 5h4 is larger than the thickness t1 of the plate portion 5h5 outside the projections 5h1 and 5h2 (see FIG. 9), and the projections 5h1 and 5h2 are annular along the circumferential direction of the annular plate 5h3. Is formed. In this ferrule packing 5h, the projection 5h1 is fitted into an annular groove provided on one abutting surface 5b3, and the projection 5h2 is fitted into an annular groove provided on the other abutting surface 5b4, and both abutting surfaces 5b3, 5b4 Is sealed. At this time, since the thickness t2 of the inner side plate part 5h4 is larger than the thickness t1 of the outer side plate part 5h5, the ferrule packing 5h can be sealed from a location inside the protrusions 5h1, 5h2. Therefore, the sealing performance can be improved as compared with the case of using the O-ring.

  In addition, in the location which uses the ferrule packing (19, 35, 39) mentioned later, although description is abbreviate | omitted, the same annular groove is provided in the surface of both sides which pinches | interposes a ferrule packing. In particular, when ferrule packings 35 and 39 are made of the same material as the seat ring 5 (in this example, a fluororesin), an annular projection corresponding to the projection 5h1 or 5h2 is formed on the outer surface of the seat ring 5. By using the provided one, the ferrule packing 35 or 39 can be omitted.

  Further, the first wall portion 5b1 on the right side of the drawing is provided with through holes 5d and 5f, and the second wall portion 5b2 on the left side of the drawing is provided with a through hole 5e and a protrusion insertion hole 5g (see FIG. 1 and FIG. 1). (See FIG. 4). That is, the butting surfaces 5b3, 5b4 avoid the through holes 5d, 5f, 5e and the protrusion insertion holes 5g, and pass through the centers of the through holes 5d, 5f, 5e and the straight lines B1, B2, B3 and the protrusion insertion holes. It is formed so as to obliquely cross a straight line B4 passing through the center of 5g (see FIGS. 4 and 7). As described above, the wall portion 5b is divided so as to have the abutting surfaces 5b3 and 5b4, and the inner surface is formed in a spherical shape, so that it is on the inner side of the through-hole 5e and the projection insertion hole 5g. An overhanging portion 5i is formed at the opposite side of the projecting portion 5i. This overhang | projection part 5i becomes obstructive when inserting the valve body 7 in the 2nd wall part 5b2. For this reason, the protrusion 7a is provided with the truncated cone part 7a2 to form a taper on the tip side so that the valve body 7 can be inserted into the second wall part 5b2.

  The case 3 is made of, for example, stainless steel, and includes a case main body 3a and a lid 3b. The case main body 3a and the lid 3b are detachably connected by a clamp band 33 (see FIGS. 1 and 3). ). As shown in FIG. 2, the clamp band 33 has three arc portions 33a, 33b, 33c, and the end portions of the two arc portions 33b, 33c are tightened or loosened by the tightening means 33g. It has become. The fastening means 33g includes a screw rod 33h and a slide member 33i that is screwed to the screw rod 33h and slides along the screw rod 33h when rotated. In FIG. 2, 33j is a hinge provided between the arc portion 33a and the arc portion 33b, and 33k is a hinge provided between the arc portion 33a and the arc portion 33c. Note that clamp bands 17 and 31, which will be described later, have the same configuration and will not be described.

  Further, as shown in FIG. 1, the lid 3b has an annular protrusion 3b1 inserted into the case body 3a, and an O-ring 3b2 provided on the outer peripheral surface of the annular protrusion 3b1 between the case body 3a and the lid 3b. The gap is sealed.

  The case 3 is formed with through holes 3d, 3e, and 3f at positions corresponding to the through holes 5d, 5e, and 5f of the seat ring 5 (see FIGS. 1 and 4). More specifically, the through holes 3d and 3e are provided in the case body 3a, and the through holes 3f are provided in the lid 3b. Corresponding through holes 5d and flow holes 3d have the same inner diameter, and corresponding through holes 5e and flow holes 3e have the same inner diameter. Corresponding through holes 5f and flow holes 3f have inner diameters. Are formed with the same dimensions. In addition, cylindrical portions 3d1, 3e1, 3f1 are formed on the outside of the locations where the flow holes 3d, 3e, 3f are provided, and external pipes (not shown) are provided to these cylindrical portions 3d1, 3e1, 3f1. Are to be connected.

  An annular seal member, for example, a ferrule packing 35 is interposed between the second wall portion 5b2 and the outer side of the end portion on the inner side of the flow hole 3e. The space between the two walls 5b2 is sealed. Further, an annular seal member, for example, a packing 21 is interposed between the inner end of the flow hole 3d and the first wall 5b1, and the case 3 around the flow hole 3d The space between the first wall portion 5b1 is sealed. Further, an annular seal member, for example, a ferrule packing 39, is interposed between the inner wall of the flow hole 3f and the first wall 5b1, and a lid 3b around the flow hole 3f. And the first wall portion 5b1 are sealed.

  The cylindrical portion 3d1 includes a base end portion 3d2 provided in the case main body 3a, and a tip end portion 3d3 that is detachably coupled to the base end portion 3d2 via the clamp band 17.

  The distal end portion 3d3 is inserted inside the proximal end portion 3d2, and has a flange portion 3d5 formed so as to project outward on the outer peripheral surface of the distal end portion 3d3, and protrudes outward on the outer peripheral surface of the distal end of the proximal end portion 3d2. The proximal end 3d2 and the distal end 3d3 are connected by abutting the formed flange 3d4 and constraining both flanges 3d4, 3d5 with the recess 17a of the clamp band 17.

  Further, an annular seal member, for example, a ferrule packing 19 is provided on the abutting surfaces of the both flange portions 3d4, 3d5. The ferrule packing 19 is the same as that shown in FIG. 9, and the space between the base end portion 3d2 and the tip end portion 3d3 is thereby sealed.

  Furthermore, the proximal end side of the distal end portion 3d3 protrudes inward from the inner end of the proximal end portion 3d2, faces the outer edge of the through hole 5d of the seat ring 5, and an endless annular seal member between the opposed portions, For example, a packing 21 is provided (see FIG. 8). In such a cylindrical portion 3d1, by removing the clamp band 17, the base end portion 3d2 and the tip end portion 3d3 are separated, and the packing 21 and the ferrule packing 19 are removed.

  The case 3 is formed with a cylindrical portion 3g1 outside the portion corresponding to the protruding portion insertion hole 5g. The valve stem 11 is inserted inside the cylindrical portion 3g1, one end 11a of the valve stem 11 is detachably connected to the connecting portion 7b, and the other end 11b of the valve stem 11 is connected to the handle 9. Mounted on.

  A flange 3i is provided outside the upper end of the cylindrical portion 3g1. The flange 3i is for fixing a joint 23 described later with a clamp band 31. A positioning protrusion 3j is formed on the upper surface of the flange 3i so as to protrude upward. In this example, one positioning protrusion 3j is provided, but two or more positioning protrusions 3j may be provided.

  11 (a) is a front view showing the valve stem 11, FIG. 11 (b) is a left side view thereof, FIG. 11 (c) is a plan view showing the upper end portion 11b of FIG. 11 (b), and FIG. ) Is a bottom view showing the lower end portion 11a of FIG.

  The valve stem 11 is a rod having a circular cross section except for one end portion 11a (the lower side in the figure) and the other end portion 11b (the upper side in the figure), and protrudes outward in the middle of the axial direction. A flange portion 11c is provided, and two annular grooves 11d and 11e are formed in a portion closer to one end portion 11a side than the flange portion 11c. O-rings 11g and 11h are fitted in these annular grooves 11d and 11e (see FIGS. 1 and 5).

  The flange portion 11c is supported by a lower stopper 29 that is detachably attached to a stepped portion 3h provided inside the upper end of the cylindrical portion 3g1 (see FIG. 1). More specifically, the lower stopper 29 has a cylindrical shape having a flange 29a projecting outward at the upper end. The through hole 29b provided in the axial center portion of the lower stopper 29 is more than the flange portion 11c of the valve stem 11. The lower portion is inserted, the flange 29a is supported by the stepped portion 3h, and the outer peripheral edge of the flange portion 11c is supported on the upper surface of the flange 29a.

  Further, both end portions 11a and 11b of the valve stem 11 are formed as navels having a constant width by omitting both sides sandwiching the shaft center. A female screw portion 11f is formed in the axial direction in the end portion 11b. The female screw portion 11 f is used for attachment to the handle 9.

  10 (a) is a front view showing the handle 9, FIG. 10 (b) is a plan view thereof, FIG. 10 (c) is a left side view showing a base end portion 9a of the handle 9, and FIG. It is a bottom view which shows the base end part 9a.

  The handle 9 has a substantially cylindrical base end portion 9a connected to the base end side of a rod 9c having a handle 9b provided at the front end, and a stepped hole is formed above the shaft center portion of the base end portion 9a. 9d is formed. The center of the stepped hole 9d substantially coincides with the axis of the base end portion 9a. A umbilical groove 9e is formed below the base end portion 9a. The umbilical groove 9e has a substantially constant width except for one end, and is connected to the stepped hole 9d. Moreover, the locking piece 9f is formed in the side surface of the base end part 9a. The locking piece 9f protrudes below the lower surface of the base end portion 9a.

  The connection between the handle 9 and the end portion 11b of the valve stem 11 is performed by screwing a screw 9g from above the stepped hole 9d to the female thread portion 11f provided at the end portion 11b of the valve stem 11 ( (See FIG. 5). At this time, the end portion 11b formed as the umbilicus is inserted into the umbilical groove 9e so as to be engaged. By operating the handle 9, the valve body 7 can be rotated around the axis A. When the opening 7 e is made to coincide with the through hole 5 e, the fluid can be discharged from the flow hole 3 e, On the other hand, when the opening 7e is aligned with the through hole 5f, the fluid can be discharged from the flow hole 3f.

  Further, a joint 23, an upper stopper 25, and a sleeve 27 are provided from the lower side between the flange portion 11c of the valve stem 11 and the base end portion 9a of the handle 9 (see FIG. 5). More specifically, a through hole 23 a provided in the shaft center portion of the joint 23 is inserted above the flange portion 11 c of the valve stem 11, and the through hole 25 a provided in each shaft center portion of the upper stopper 25 and the sleeve 27. , 27a are inserted respectively.

  12A is a front view showing the joint 23, FIG. 12B is a left side view, and FIG. 12C is a plan view of FIG. 12B.

  The joint 23 presses the flange portion 11c from the upper side to the lower stopper 29 and fixes the valve rod 11 to the case 3 by a clamp band 31 described later. Two annular protrusions 23b on the outer periphery of the cylindrical body, 23c is provided, and the lower end 23d is configured to come into contact with the upper surface of the flange portion 11c of the valve rod 11 (see FIG. 1). Of the annular protrusions 23b and 23c, the lower annular protrusion 23c is disposed at a position slightly above the lower end 23d, and the upper annular protrusion 23b is disposed at a position slightly below the upper end 23e. . A positioning hole 23f into which the positioning protrusion 3j is inserted is formed in the lower annular protrusion 23c (see FIGS. 12 and 1). Note that the upper portion of the upper annular protrusion 23b is cut off on both sides sandwiching the axial center to form a pair of parallel surfaces 23g.

  The upper stopper 25 regulates the rotation angle of the handle 9, and as shown in FIG. 13, a parallel portion 25c is formed in which both sides sandwiching the axis of the inner peripheral surface 25b surrounding the through hole 25a are narrowed. The upper surface 25 is attached to the upper side of the upper annular protrusion 23b of the joint 23 with the parallel surface 23g coinciding with the parallel portion 25c. Further, the two portions 25d and 25e protruding outward abut on the locking piece 9f to change the direction of the handle 9 by 180 °, so that the opening 7e of the valve body 7 is set to one of the through hole 5e and the through hole 5f. This is the part that is surely matched. In addition, Fig.13 (a) is sectional drawing (front sectional drawing) by CC line of the same (b).

  The sleeve 27 facilitates the rotation of the valve stem 11, is formed in a cylindrical shape having a flange 27b at the upper end, and the flange 27b is inserted into the through hole 27a with the upper portion of the flange 11c of the valve stem 11 inserted. 27b is supported by the upper end 23e of the joint 23 and the upper surface of the upper stopper 25 (see FIGS. 1 and 5).

  The valve rod 11 is fixed to the case 3 by fixing the annular protrusion 23c on the lower side of the joint 23 and the flange 3i with the clamp band 31 (see FIG. 1). Further, the handle 9 is also connected to the case 3 by this fixing. Further, the lower end portion 11 a of the valve rod 11 is connected to the connecting portion 7 b of the valve body 7. As the shapes of the end 11a and the connecting portion 7b, in this example, the end 11a of the valve stem 11 is formed on the umbilicus which is a minus (−) convex portion (see FIG. 11), and the connecting portion 7b is the end 11a. It is formed in the umbilical groove which is a minus-shaped (−) concave portion into which (see FIG. 6). Alternatively, the end 11a of the valve stem 11 may be formed in the umbilicus, which is a plus (+) convex part, and the connecting part 7b may be formed in the umbilical groove, which is a plus (+) concave part into which the end 11a is inserted. Alternatively, the end 11a of the valve stem 11 may be formed in a concave shape, and the connecting portion 7b may be formed in a convex shape.

  Next, disassembly and assembly of the ball valve 1 according to the present embodiment configured as described above will be described with reference to FIGS. 4 and 5.

  First, assembly of the case 3 will be described with reference to FIG. The second wall portion 5b2 is inserted into the case body 3a with a ferrule packing 35 interposed therebetween, and then the valve body 7 is inserted. When the valve body 7 is inserted, the protrusion 7a of the valve body 7 is aligned with the protrusion insertion hole 5g.

  Thereafter, the first wall 5b1 is inserted between the butted surfaces 5b3 and 5b4 of the first wall 5b1 and the second wall 5b2 with the ferrule packing 5h interposed.

  Subsequently, the lid 3b is fixed to the case body 3a by the clamp band 33 so that the ferrule packing 39 is sandwiched therebetween.

  Thereafter, the distal end portion 3d3 is inserted inside the proximal end portion 3d2. At this time, the packing 21 is interposed between the inner wall side of the tip 3d3 around the opening 7d and the first wall 5b1.

  Next, the flange portion 3d5 of the distal end portion 3d3 and the flange portion 3d4 of the proximal end portion 3d2 are brought into contact with each other, and both the flange portions 3d4 and 3d5 are restrained by the clamp band 17. Thereby, the end 3d2 and the tip 3d3 are connected, and the assembly of the case 3 is completed.

  Next, the handle 9 is attached to the case 3 as follows.

  First, as shown in FIG. 5, the lower stopper 29 is attached to the stepped portion 3 h provided inside the upper end of the cylindrical portion 3 g 1 of the case 3, and the lower end side of the valve stem 11 is placed inside the through hole 29 b of the lower stopper 29. Insert a part. Finally, the flange 11c of the valve stem 11 is supported by the lower stopper 29. In this supported state, the lower end portion 11a of the valve rod 11 and the connecting portion 7b of the valve body 7 are engaged. This engagement is possible by rotating the valve stem 11 about its axis. Further, the O-rings 11g and 11h seal the space between the cylindrical portion 3g1 of the case 3 and the valve stem 11 with the insertion of the valve rod 11 into the cylindrical portion 3g1.

  Next, the through holes 23a, 25a, 27a of the joint 23, the upper stopper 25, and the sleeve 27 are inserted in this order from the upper end of the valve stem 11. At this time, the joint 23 is positioned in the circumferential direction by inserting a positioning projection 3j (see FIG. 1) provided in the case 3 into the positioning hole 23f provided in the joint 23 (see FIG. 12). The upper stopper 25 is attached to the upper side of the upper annular projection 23b by aligning the parallel surface 23g (see FIG. 12) provided on the upper end portion of the joint 23 with the parallel portion 25c formed thereon (see FIG. 13). , Positioning in the circumferential direction. In the state where the sleeve 27 is attached to the valve stem 11, the upper end portion 11 b of the valve stem 11 protrudes above the sleeve 27.

  Next, the navel provided at the end portion 11b is inserted into the umbilical groove 9e provided at the base end portion 9a of the handle 9 in the same direction, and a screw 9g is screwed into the stepped hole 9d from above. As a result, the handle 9 is connected to the valve stem 11.

  Next, the annular projection 23 c on the lower side of the joint 23 and the flange 3 i are fixed by the clamp band 31. As a result, the valve stem 11 is fixed to the case 3, and the lower end portion 11a of the engaged valve stem 11 and the connecting portion 7b of the valve body 7 are connected. The annular protrusion 23c and the flange 3i may be fixed by the clamp band 31 at an arbitrary timing after the joint 23 is attached to the valve stem 11.

  Thus, the operation of attaching the handle 9 to the case 3 may be performed prior to the assembly of the case 3, and the ball valve 1 of the present embodiment can be assembled even in this way. The disassembly may be performed in reverse to the above assembly, and the description is omitted.

  Therefore, in the ball valve 1 of the present embodiment, the first wall portion 5b1 and the second wall portion 5b2 in the seat ring 5 avoid the through holes 5d, 5f, 5e and the protrusion insertion holes 5g, and each through hole 5d. 5f and 5e are divided into two so as to obliquely cross the straight lines B1, B2 and B3 passing through the centers of the projections 5a and 5b and the straight line B4 passing through the center of the protrusion insertion hole 5g, and the first wall 5b1 and the second wall 5b Since the endless ferrule packing 5h is interposed between the butted surfaces 5b3 and 5b4 so as to surround the outside of the internal cavity 5a, the seat ring split surface and the sealing member are provided on the inner peripheral surface of the through-hole as in the prior art. The end is not exposed, and the occurrence of a liquid pool around the through holes 5d, 5f, 5e and the protrusion insertion hole 5g can be prevented.

  Further, in the ball valve 1 of the present embodiment, since the endless O-ring 7i is provided between the outer peripheral surface of the protrusion 7a and the inner peripheral surface of the protrusion insertion hole 5g, the outer periphery of the protrusion 7a The space between the surface and the inner peripheral surface of the protrusion insertion hole 5g is sealed by the O-ring 7i, and the occurrence of liquid pool around the protrusion insertion hole 5g can be prevented.

  Furthermore, in the ball valve 1 of the present embodiment, the peripheral portions of the through holes 5d, 5f, and 5e in the seat ring 5 and the peripheral portions of the flow holes 3d, 3f, and 3e of the case 3 are abutted with each other, An endless packing 21 is interposed between the peripheral edge of the through hole 5d and the peripheral edge of the flow hole 3d, and the endless packing 21 is similarly provided between the peripheral edge of the through hole 5f and the peripheral edge of the flow hole 3f. Since the ferrule packing 39 is interposed and the endless ferrule packing 35 is also interposed between the peripheral edge of the through hole 5e and the peripheral edge of the flow hole 3e, the ferrule packing 35 is interposed between the seat ring 5 and the case 3. In addition, it is possible to prevent the occurrence of a liquid pool. At this time, the ferrule packing 39 has the same inner diameter as that of the through hole 5f (flow hole 3f), and the ferrule packing 35 has the same inner diameter as that of the through hole 5e (flow hole 3e). It is preferable to form so that it may become the same. By doing in this way, it can prevent that an unevenness | corrugation generate | occur | produces between the through-hole 5f and the flow hole 3f, and between the through-hole 5e and the flow hole 3e, respectively, and can prevent that a liquid pool arises. it can.

  In addition, in embodiment mentioned above, although applied to the three-way ball valve 1, this invention is not limited to this. For example, the present invention can be similarly applied to a two-way ball valve having a configuration in which one of the group of the through hole 5f and the through hole 3f and the group of the through hole 5e and the through hole 3e is omitted. Alternatively, the present invention can be similarly applied to a two-way ball valve 1A as shown in FIGS.

  14 is a front view showing a two-way ball valve 1A according to another embodiment of the present invention, FIG. 15 (a) is a front view showing a valve body used for the ball valve 1A, and FIG. 14 (b) is a left side view thereof. The figure (c) is a top view of (b). 16A is a front view showing a seat ring used for the ball valve 1A, FIG. 16B is a left side view thereof, FIG. 16C is a plan view of FIG. 17B, and FIG. The front view which shows the upper side stopper 25A used for 1A, (b) is the top view. 14 to 17, the same parts as those in FIGS. 1, 6, 7, and 13 are denoted by the same reference numerals.

  The valve body 7A used for the ball valve 1A has a configuration in which the internal passage 7C is linear and the openings 7E and 7F are provided on opposite sides of the shaft center, and the opening 7E is formed through the through-hole 5e. When the direction of the flow hole 3e is directed and the opening 7F is directed to the through hole 5f and the flow hole 3f, a predetermined fluid is allowed to flow, and when the opening 7E and the opening 7F are directed to the other direction, the flow is stopped. It is like that. The valve body 7A is formed in a spherical shape except for a portion where the protrusion 7a and the openings 7E and 7F are formed.

  In the seat ring 5A of the two-way ball valve 1A, the first wall 5b1 and the second wall 5b2 avoid the through holes 5f and 5e and the protrusion insertion holes 5g, and center the through holes 5f and 5e. The straight line B2 and B3 that pass through and the straight line B4 that passes through the center of the protrusion insertion hole 5g are diagonally crossed into two, and the interior is between the first wall 5b1 and the butted surfaces 5b3 and 5b4 of the second wall 5b. An endless ferrule packing 5h is interposed so as to surround the outside of the cavity 5a (see FIG. 16A). Therefore, also in this two-way ball valve 1A, as before, the split surface of the seat ring and the end of the seal member are not exposed on the inner peripheral surface of the through hole as in the prior art, and the through holes 5f, 5e and the protrusions are not exposed. Occurrence of a liquid pool around the part insertion hole 5g can be prevented.

  Further, the upper stopper 25A of the two-way ball valve 1A performs the flow and blocking of the fluid by rotating the handle 9 by 90 °, so that the two portions 25d and 25e protruding outward are axially centered. It is arranged in a different direction by 90 °. In FIG. 17, the portion 25e is provided at a portion rotated 90 ° counterclockwise.

  In the above-described embodiment, the ferrule packing is used for some of the plurality of portions, the packing is used for the other portions, and the O-ring is used for the remaining portions. These ferrule packing, packing, O-ring, etc. The one corresponding to the required sealing performance of the seal part may be used. For example, a ferrule packing may be used at a location using packing, or a packing or a ferrule packing may be used at a location using an O-ring.

DESCRIPTION OF SYMBOLS 1, 1A Ball valve 3 Case with lid 3b Lid 3d, 3e, 3f Flow hole 5, 5A Seat ring 5a Internal cavity 5b Wall part 5b1 First wall part 5b2 Second wall part 5b3, 5b4 Abutting surface 5d, 5e, 5f Through hole 5g Protrusion insertion hole 5h Ferrule packing 7, 7A Valve body 7a Protrusion 7c, 7C Internal passage 7d, 7e, 7E, 7F Open 7g Outer surface 7i O-ring 9 Handle 11 Valve rod 19, 35, 39 Ferrule packing 21 Packing A Axis B1, B2, B3, B4 Straight line passing through the center

Claims (10)

A spherical valve body that is rotated about a predetermined axis, has an internal passage, and is provided with a plurality of openings on the outer surface thereof that communicate with the internal passage;
A seat ring that rotatably supports the valve body at a wall portion surrounding an internal cavity into which the valve body enters, and has a through hole at a position related to an opening in the valve body of the wall portion;
The valve body is accommodated through the seat ring, and a lidded case having a through hole communicating with the through hole at a position corresponding to the through hole,
In the seat ring, the wall portion is divided into two so as to obliquely cross a straight line passing through the center of the through hole while avoiding the through hole, and the inner portion is provided between the butted surfaces of the divided wall portions. An endless annular seal member is interposed so as to surround the outside of the cavity. The ball valve according to claim 1,
A ball characterized in that the annular seal member uses a ferrule packing having protrusions on both sides of an annular plate, and the inner plate part is thicker than the protrusions than the protrusions. valve. The ball valve according to claim 1 or 2,
The seat ring is provided with the through hole in a portion in the axial direction of the valve body and two symmetrical portions on the inner peripheral surface farthest from the shaft center and sandwiching the center of the valve body, A through-hole in the axial direction portion and one through-hole in the two symmetrical portions are disposed in one wall portion divided into two, and the other through-hole in the two symmetrical portions is disposed in the other wall portion. A ball valve having holes. The ball valve according to claim 1 or 2,
In the seat ring, the through hole is provided in a portion in the axial direction of the valve body and one portion on the inner peripheral surface farthest from the shaft center, and one of the two wall portions divided into two is provided. A ball valve characterized in that a through hole is provided and the other through hole is provided in the other wall portion. The ball valve according to claim 1 or 2,
The seat ring is provided with two through-holes in two symmetrical portions on the inner peripheral surface farthest from the axis and sandwiching the center of the valve body, and the two wall portions are divided into two A ball valve characterized in that one through hole of a symmetrical portion is disposed, and the other through hole of the two symmetrical portions is disposed on the other wall portion. The ball valve according to any one of claims 1 to 5,
The valve body is formed with a protruding portion that is detachably connected to a valve rod for driving the valve body to rotate about the axis, and the one seat ring includes the protrusion A ball valve, wherein a protrusion insertion hole into which a protrusion is inserted is provided, and the abutting surface is formed so as to pass through a position avoiding the protrusion insertion hole. The ball valve according to claim 6.
An endless annular seal member is disposed between an outer peripheral surface of the protrusion and an inner peripheral surface of the protrusion insertion hole. The ball valve according to any one of claims 1 to 7,
A ball valve characterized in that a peripheral edge portion of the through hole and a peripheral edge portion of the flow hole are abutted with each other, and an endless annular seal member is interposed between the peripheral edge portions. The ball valve according to any one of claims 6 to 8,
A ball valve characterized in that a taper is provided on a distal end side of the protrusion and the valve body can be inserted inside a divided wall portion having the protrusion insertion hole. The ball valve according to claim 8 or 9,
The ball valve characterized in that the through hole and the flow hole have an inner peripheral surface of the same size, the annular seal member is a ferrule packing, and an inner diameter thereof is formed to be the same as the size.

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