JP6018027B2 - Butterfly valve - Google Patents

Description

  The present invention relates to a butterfly valve in which a valve case seat seat is fixed to a valve box by a seat keeper, and an allowance of the valve box seat seat in the valve box is adjusted.

For example, as shown in FIG. 8, a large-diameter butterfly valve used for water supply or the like has a valve body 2 that can open and close the flow path in a cylindrical valve box 1, and is disposed on the inner peripheral surface of the valve box 1. The structure provided with the valve seat 3 which the outer peripheral surface of the valve body 2 press-contacts is common.
In this butterfly valve, as shown in the figure, a seat keeper (a member for fixing the valve seat 3) 4 is provided on the inner surface of the valve box 1 adjacent to the entire circumference of the valve seat 3 in the valve box axial direction b. There is a seat keeper 4 that is inserted through a bolt (screw) 5 and screwed to the inner surface of the valve box (see Patent Document 1, paragraph 0003 and FIG. 3).

  The seat keeper 4 has a cross-sectional shape in which a trapezoid is superimposed on one side of a quadrangle, and one inclined surface 4a of the trapezoid is in contact with the tapered surface (inclined surface) 3a of the leg portion of the valve seat 3 and the other The inclined surface 4b contacts the groove taper surface (inclined surface) 6 on the inner surface of the valve box. For this reason, with the fastening of the seat keeper 4 (movement of the seat keeper 4 in the valve box 1 radial direction a), the valve seat 3 is in the valve box radial direction a and the one inclined surface 4a via the leg taper surface 3a. It is pressed in the coaxial direction b, is fixed to the inner surface of the valve box 1 and is compressed and bulges from the inner surface of the valve box 1, and the allowance adjustment from the inner surface of the valve box 1 of the valve seat 3 is performed according to the degree of compression.

Japanese Patent Application Laid-Open No. 08-170736

  The seat keeper 4 in the conventional butterfly valve simultaneously presses the valve seat 3 in the valve box radial direction a and the coaxial direction b to fix it to the inner surface of the valve box and adjusts the allowance. For this reason, the pressing force in the valve box radial direction a and the coaxial direction b is applied to the valve seat 3 at the same time, and one action affects the other action. (Unreasonable force) is applied, and the reaction force is one cause that hinders smooth adjustment of the balance.

  Further, the fastening of the seat keeper 4 requires a gap s between the seat keeper 4 and the bottom surface of the groove 6 in order for the seat keeper 4 to move in the valve box radial direction a. For this reason, when the valve is closed, the valve seat 3 is compressed by the pressing force of the valve body 2 and escapes (swells) into the gap s, which may reduce the sealing performance. In particular, when this butterfly valve is interposed in the high-pressure fluid conduit, there is a high possibility that the valve seat 3 is pressed by the fluid pressure and escapes to the gap s to cause a decrease in sealing performance. If the high pressure fluid causes a drop in the seal due to escape to the gap s, so-called “back leakage” occurs in which the fluid flows out from the lowered seal portion to the opposite side.

  This invention makes it a subject to make it possible to perform valve box fixation of the valve seat by the said seat keeper, and adjustment of an allowance, without causing the said sealing performance to fall under the above actual condition.

In order to achieve the above object, the present invention provides a fixing member for fixing the seat keeper to the inner surface of the valve box by pressing the valve seat in the valve box radial direction a, and a valve seat for pressing the valve keeper in the valve box axial direction b. That is, it is composed of two members including a balance adjusting member.
If two members are used in this way, the valve box fixing of the valve seat and the same adjustment can be individually performed by separate members. Therefore, one action does not affect the other action, and the above-mentioned impossible. Application of force can be suppressed as much as possible.

  As a specific configuration of the present invention, a valve body capable of opening and closing the flow path is disposed in the valve box, and a valve seat seat in which the outer peripheral surface of the valve body is pressed against the inner peripheral surface of the valve box is provided. In the butterfly valve provided with a seat keeper that presses the valve seat in the valve box radial direction and the coaxial direction adjacent to the valve seat, the seat keeper is adjacent to the valve seat in the valve box axial direction. A fixing member that presses the valve member in the valve box radial direction and fixes it to the inner surface of the valve box, and a valve seat seat that presses the fixing member in the valve box axial direction adjacent to the fixing member in the valve box axial direction. A configuration including a member for adjusting the cost can be employed.

With this configuration, for example, the valve seat is first fixed to the inner surface of the valve seat by the fixing member, and then the fixing member is moved in the valve box axial direction by the allowance adjusting member. Can be adjusted by adjusting the balance. In this way, the valve seat is fixed and compressed (adjustment adjustment) in two stages (two members).
At the time of adjusting the allowance, it is necessary to move the fixing member and the allowance adjusting member in the valve box axial direction, and various configurations are conceivable. For example, the fixing member and the adjusting allowance The members are fastened to the inner surface of the valve box by bolts that are inserted through the members and screwed into the inner surface of the valve box, and the bolt insertion holes of the fixing member and the adjusting member for adjusting the allowance are connected to the bolt by the members. If the gap is movable in the axial direction, the fixing member and the allowance adjusting member can move in the axial direction of the valve box with respect to the bolt due to the presence of the gap.

  In addition, there are various configurations of the means for pressing (moving in the valve box axial direction) the fixing member by the allowance adjusting member. For example, both the facing surfaces of the allowance adjusting member and the storage groove are inclined surfaces. It can be performed by the cooperative action of the inclined surfaces, or the opposing surfaces of the output adjusting member and the fixing member can be inclined surfaces, respectively, by the cooperative action of both inclined surfaces. In the latter case, the movement adjustment member is not moved in the valve box axial direction, and fine adjustment of the movement of the fixing member in the valve box axial direction is facilitated.

  As described above, according to the present invention, the valve seat fixing of the valve seat and the same allowance adjustment can be performed individually, so that the excessive force can be suppressed as much as possible. For this reason, it is easy to adjust the allowance, and the durability of the valve seat can be improved. Further, since the gap s for fixing the valve seat to the valve box is not necessary, the sealing performance is not deteriorated by the gap s. For this reason, the possibility of “back leakage” is low, and a useful butterfly valve that can be used in a pipe line (both flows) in which fluid flows from both directions in a high-pressure fluid can be provided.

Schematic cut side view of one embodiment of the butterfly valve of this invention 1 is an enlarged view of the main part of FIG. The member for valve seat seat fixation of the embodiment is shown, (a) is a front view, (b) is a sectional view. The valve seat extension adjustment member of the embodiment is shown, (a) is a front view, (b) is a sectional view. Installation and departure allowance adjustment explanatory diagram of the valve seat of the same embodiment (A), (b) is the principal part enlarged view of other embodiment, respectively. Main part enlarged view of other embodiment Partially cut side view of conventional example

One embodiment according to the butterfly valve of the present invention is shown in FIGS. 1 to 4, and the butterfly valve of this embodiment is provided in a pipe of a water supply.
This butterfly valve has a short cylindrical valve box 11 made of cast metal, a valve body 12 capable of opening and closing its flow path, a valve rod 13 that rotates integrally with the valve body 12, and a valve box 11 as in the prior art. It comprises a rubber valve seat 14 provided on the entire inner peripheral surface, and a seat keeper 20 adjacent to the valve seat 14 to press the valve seat 14 in the valve box radial direction a and the coaxial direction b.
As in the conventional case, the valve box 11 penetrates the valve rod 13 in the radial direction “a” in the center of the cylindrical portion in the width direction and supports both ends thereof in a watertight manner.

  The valve body 12 includes a circular valve plate 12a, a rib 12b around and around the valve plate 12a, and a cylindrical mounting boss 12c, as in the prior art, and these 12a, 12b, 12c. Is a monolith. By fitting the valve stem 13 to the boss 12c of the valve body 12, passing the bolt 12d through the boss 12c and the valve stem 13 and fastening with the nut 12e, the valve body 12 (valve plate 12a) is eccentric to the valve stem 13. Mounted and fixed. Therefore, this embodiment is a primary eccentric butterfly valve. In the drawing, reference numeral 12f denotes a valve body valve seat provided on the outer peripheral edge of the valve body 12.

  As in the prior art, the valve seat 14 has a shape in which the cross-section is a trapezoid on one side of a quadrangle, and when its leg portion is fitted into the storage groove 11a such as the valve seat 14 on the inner peripheral surface of the valve box, One trapezoidal inclined surface 14a comes into contact with the inclined surface 11c on one side of the groove 11a to be temporarily fixed to the inner surface of the valve box.

The above configuration is the same as that of the prior art, and the present invention is characterized by the configuration of the sheet keeper 20. The seat keeper 20 is different from the related art in that the fixing member 21 adjacent to the valve seat 14 in the valve box axial direction b and the adjustment of the amount of the valve seat 14 adjacent to the fixing member 21 in the valve box axial direction b are adjusted. Member 22 for use.
The fixing member 21 has a square cross section and has a shape in which the surface on the valve seat side is in close contact with the side surface of the valve seat 14, and the opposite surface is a surface in the valve box radial direction a. Further, the allowance adjusting member 22 has a square cross section and a surface that contacts the surface of the fixing member 21 in the valve box radial direction is a similar surface in the valve box radial direction a (surface orthogonal to the valve box axial direction b). In addition, the opposite surface is a surface 22b inclined rightward toward the outside of the valve box corresponding to the other inclined surface 11b of the storage groove 11a.

  The fixing member 21 and the allowance adjusting member 22 have through holes 23 and 24, respectively. The fixing bolts 25 and 25 are inserted into the through holes 23 and 24 and screwed into the inner surface of the valve box (fastened). This is fixed to the inner surface of the valve box. At this time, both the insertion holes 23 and 24 are long holes in the axial direction b of the valve box 11. When the fixing bolt 25 is inserted into the insertion holes 23 and 24, a gap 26 is formed on the side surface of the fixing bolt 25. As a result, the fixing member 21 and the allowance adjusting member 22 are movable with respect to the fixing bolt 25 in the valve box axial direction b. The insertion holes 23 and 24 may not be long holes but may be circular having a gap 26 in which the fixing member 21 and the allowance adjusting member 22 can move in the valve box axial direction b with respect to the fixing bolt 25.

Further, as shown in FIG. 3, the fixing member 21 has an annular shape divided into three equal parts. The conventional seat keeper 4 is composed of a large number of divided members, such as 16 equal parts, in the same manner as the output adjustment member 22 in order to perform both the fixing and compression of the valve seat 3. However, since the fixing member 21 of the present invention only needs to perform the fixing action of the valve seat 14, it only needs to be able to fit into the storage groove 11 a, and may be a minimum number of two members.
From the above, the number of divisions of the fixing member 21 is arbitrary as long as it is two or more, but if it is three or more, the division member 21a can be fitted into the receiving groove 11a without being deformed, When the number of divisions is small, the joints of the fixing member 21 are also reduced, and the valve seat 14 can be more stably fixed. For this reason, it can be said that the division into three is the most excellent.
The number of the insertion holes 23 in each divided member 21a is appropriately set in consideration of its mounting strength, mounting properties, and the like. In this embodiment, the through-holes 23 are formed at approximately equal intervals in the one-part material 21a.

  As shown in FIG. 4, the allowance adjusting member 22 has an annular shape divided into 16 equal parts. In order to adjust the degree of protrusion (protrusion allowance) of the valve seat 14 from the inner surface of the valve box, the allowance adjusting member 22 is divided into 16 equal parts as in the prior art. The reason why such a large number of divided members 22a is used is to finely adjust the uniform allowance over the entire circumference of the valve seat 14 as much as possible. For this reason, the number of divisions is appropriately set by experiment or the like so as to obtain the equivalent allowance considering the size of the allowance adjusting member 22 (valve seat 14). Further, the number of the insertion holes 24 in each divided member 22a is appropriately set in consideration of the attachment strength, the attachment property, and the like. In this embodiment, the through-holes 24 are formed at approximately equal intervals in the one-part material 22a.

In order to house and attach the valve seat 14 to the housing groove 11a of the valve box 11 by the fixing member 21 and the allowance adjusting member 22, for example, as shown in FIG. That is, as shown in FIG. 5A, first, the valve seat 14 is fitted into the storage groove 11a, and then the fixing member 21 is fitted and fastened with the bolt 25. By this fastening, the valve seat 14 is fixed to the inner surface of the valve box (the storage groove 11a). At this time, it may be temporarily fixed.
Next, as shown in FIG. 6B, the allowance adjusting member 22 is fitted into the storage groove 11a adjacent to the fixing member 21 (with the dividing member 22a fitted therein), and the bolt 25 is attached to the receiving groove adjusting member 22a. It is inserted into each insertion hole 24 and screwed into the inner surface of the valve box (the bottom surface of the storage groove 11a).

With the screwing, the contact (corresponding) position of the inclined surface 22b of the allowance adjusting member 22 and the inclined surface 11b of the storage groove 11a shifts (by the cooperative action of both inclined surfaces 22b and 11b). Each split member 22a of the allowance adjusting member 22 gradually presses the fixing member 21 (the split member 21a) toward the valve seat 14 side. For this reason, the fixing member 21 moves through the gap 26 in the direction in which the valve seat 14 is compressed (valve box axial direction b), and compresses the valve seat 14. With this compression, the valve seat 14 protrudes from the inner surface of the valve box (see FIG. 5C). At this time, when the fixing member 21 is difficult to move in the valve box axial direction b, the fastening force of the bolt 25 can be loosened.
By performing the screwing action of the bolt 25 on each divided member 22a of the allowance adjusting member 22, the required allowance is evenly distributed over the entire circumference of the valve seat 14.

  In the above embodiment, the cross-sectional shape of the valve seat 14 is the same as that of the conventional one. However, the present invention does not compress the valve seat 14 by fastening the fixing member 21, and therefore the leg portion of the valve seat 14. There is no need for the inclined surface 14a. For this reason, the cross-sectional shape of the valve seat 14 that increases the fixing force of the valve seat 14 by the fixing member 21, for example, the inclined surface 4a of FIG. The horizontal surface 14a ′ of b may be a convex surface 14a ″ as shown in FIG.

Further, the pressing means of the fixing member 21 by the allowance adjusting member 22 does not cooperate with the inclined surface 22b of the allowance adjusting member 22 and the inclined surface 11b of the storage groove 11a, as shown in FIG. The inclined surface 22c of the allowance adjusting member 22 and the inclined surface 21c of the fixing member 21 can be operated in cooperation. At this time, the contact surface (contact surface) 22b with the side surface (inclined surface) 11b of the storage groove 11a of the allowance adjusting member 22 may be a surface in the valve box radial direction a (see FIG. 7). In this way, the movement adjustment member 22 does not move in the valve box axial direction b, and fine adjustment of the movement of the fixing member 21 in the valve box axial direction b is facilitated.
Further, when adjustment of the allowance of the valve seat 14 is completed, as shown in FIGS. 6 and 7, the center axis of the insertion holes 23 and 24 and the axis of the bolt 25 are substantially coincided with each other in FIG. ) Can be adjusted so that the left side of the bolt 25 is wider than the right side.

  Although the above embodiment is a primary eccentric butterfly valve, the present invention can be applied not only to the butterfly valve shown in FIG. 8 in which the valve body 2 is not eccentric, but also to the secondary eccentric butterfly valve and the like. It is. In these butterfly valves, the seat keeper 20 according to the present invention can be provided on both sides (left and right in FIG. 2) of the valve seat 14.

11 Valve box 11a Valve seat seat groove 11b of valve box Inclined surface 2, 12 Valve body 3, 14 Valve box valve seat 4, 20 Seat keeper 21 Seat keeper fixing member 21a Dividing of the fixing member Material 21c Inclined surface 22 of the fixing member 22A Keeping member adjusting member 22a Dividing members 22b and 22c of the adjusting member 23 Inclining surface 23 of the adjusting member Bolt insertion hole 24 of the fixing member Bolt insertion hole 25 of the allowance adjustment member Fixing member 26 and fixing bolt 26 of the allowance adjustment member A gap between the insertion holes 23 and 24 and the bolt 25 a Valve box radial direction b Valve box axial direction

Claims (3)

A valve seat (12) that can open and close its flow path is disposed in the valve box (11), and the valve seat (in which the outer peripheral surface of the valve body (12) is in pressure contact with the inner peripheral surface of the valve box (11) 14) and a butterfly valve provided with a seat keeper (20) that presses the valve seat (14) in the valve box radial direction (a) and the coaxial direction (b) adjacent to the valve seat (14).
The seat keeper (20) is adjacent to the valve seat (14) in the valve box axial direction (b) and presses the valve seat (14) in the valve box radial direction (a) to thereby open the valve box (11). A fixing member (21) that is fixed to the inner surface, and a valve that presses the fixing member (21) in the valve box axial direction (b) adjacent to the fixing member (21) in the valve box axial direction (b). e Bei the allowance for projection adjusting member of the seat sheet (14) (22),
The fixing member (21) and the allowance adjusting member (22) are respectively connected to the inner surface of the valve box (11) by bolts (25) inserted through the members (21, 22) and screwed into the valve box (11). The bolt insertion holes (23, 24) of the fixing member (21) and the allowance adjusting member (22) are connected to the bolt (25) so that the members (21, 22) are connected to the valve box shaft. features and to Luba Tafurai valve to have a gap (26) movable in a direction (b). The valve seat (14), the fixing member (21) and the allowance adjusting member (22) are fitted into the storage groove (11a) around the inner periphery of the valve box (11), and the storage groove (11a) The adjacent facing surfaces (11b, 22b) of the allowance adjusting member (22) are inclined surfaces in the valve box radial direction (a), and in the valve box radial direction (a) of the allowance adjusting member (22). The butterfly valve according to claim 1, wherein the fixing member (21) is moved in the valve box axial direction (b) through the both inclined surfaces (11b, 22b) by movement. The opposing surfaces (21c, 22c) adjacent to the fixing member (21) and the allowance adjusting member (22) are inclined surfaces in the valve box radial direction (a), so that the allowance adjusting member (22) claim, wherein the both inclined surfaces by the movement of the valve body radially (a) (21c, 22c) fixing member via (21) is to move the valve body axis direction (b) 1 butterfly valve according to.

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