JP3740132B2 - Butterfly valve seat ring - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a butterfly valve for opening / closing and controlling a flow path through which a fluid flows, and particularly to a seat ring mounting structure mounted on an inner peripheral surface of a valve body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a wafer type butterfly valve that is sandwiched and attached between flanges of a piping pipe in order to open and close a pipeline is known and widely used. In general, a butterfly valve is composed of a valve body made of a rigid material such as metal penetrating a cylindrical flow path, and a disk-shaped valve body rotatably supported by a valve rod in the valve body. And a seat ring made of an elastic material interposed between the inner peripheral surface of the valve body and the valve body, and the flow path is opened and closed by bringing the outer peripheral surface of the valve body into and out of contact with the inner peripheral surface of the seat ring. .
[0003]
The seat ring of the butterfly valve is made of an elastic material, and when the valve is closed, the outer peripheral surface of the valve body is pressed against the inner peripheral surface of the seat ring to be eaten. A large repulsive force is generated by the pressure contact between the valve body and the valve body, and the rotational torque of the valve body is increased. The seat ring tends to be peeled off from the valve body by the drag force brought into pressure contact with the valve body or the suction force by the fluid. To prevent separation of the seat ring from the valve body, both side surfaces of the seat ring are fitted to the peripheral side surface of the valve body, and the outer peripheral surface of the seat ring is attached to the inner peripheral surface of the valve body with the required compression allowance. However, the elastic tightening force is exhibited. Further, as shown in Japanese Patent No. 3188680, a protrusion is provided at the center of the outer peripheral surface of the seat ring, and is fitted into a concave groove at the center of the inner peripheral surface of the valve body to prevent movement of the seat ring. Things have also been proposed.
[0004]
That is, a conventionally known seat ring generally has a structure that is firmly attached so as not to move on the inner peripheral surface of the valve body. For this reason, the elastic repulsion force of the seat ring when the valve body comes into contact with the inner peripheral surface of the seat ring when the valve is closed increases the rotational torque of the valve body, making it difficult to open and close the valve.
[0005]
[Patent Document 1]
Japanese Patent No. 3188680 [0006]
[Problems to be solved by the invention]
According to the present invention, the seat ring is mounted on the inner peripheral surface of the valve body with a sufficiently large elastic clamping force so that the seat ring can be stably attached, and the rotational torque of the valve body can be reduced. It is.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention adopts a seat ring ( 2 ) made of an elastic sealing material in a valve main body ( 1 ) having a cylindrical flow path, and the seat ring ( 2 The disc-shaped valve body ( 3 ) that is in contact with and away from the valve body is pivotally supported to form a valve stem shaft support portion (102) (103) in the diameter direction of the valve body ( 1 ) , thereby forming the valve body ( 3) with supporting the valve rod (4) for supporting the, one of the valve rod (4) of the valve body by connecting an actuator (6) to the outer end (3) butterfly valve which is adapted to rotate the , The central portion of the inner peripheral surface of the valve body ( 1 ) protrudes inward to form an engaging convex portion (104) around the inner peripheral surface of the valve main body ( 1 ) , and the engaging convex portion ( 104) is a groove (204) for engaging incoming formed by surrounding the outer circumferential surface of the seat ring (2), the engaging projection (104) and grooves (204) seat ring that is engaged in (2) the central portion (a) the valve body (1) inner peripheral surface in the relaxed without tightly crimped With kana in the contact state to reduce the compression margin of the seat ring (2), side portions (B, C) engaging portions of the inner peripheral surface of the valve body (1) of the groove of the seat ring (204) ( in close crimped on both sides of 104), by increasing the compression margin of the seat ring (2), it is held in the valve body (1) inner peripheral surface of the seat ring (2) dated elastic tightening force in the both sides At the same time, the valve body ( 3 ) is pressed against the central portion of the gentle contact state, and the central portion of the seat ring ( 2 ) is accompanied by the rotational direction of the valve body ( 3 ) to allow slight movement, The rotating torque of the body ( 3 ) is reduced.
[0008]
A slope is formed between the inner peripheral surface and the outer peripheral side surface of the seat ring, and the angle and width formed by the inclined surface and the outer peripheral side surface are the largest at the valve shaft orthogonal position and the smallest at the valve shaft position. To do.
[ 0009 ]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described in detail below. The present invention provides a seat ring made of an elastic sealing material attached to the inner peripheral surface of a valve body, wherein the central portion where the valve body is pressed against is attached to the valve body with a small compression allowance, preferably at least one side portion of the central portion, By attaching the both sides to the valve body with a large compression allowance and changing the compression allowance of the seat ring relative to the valve body, the seat ring is firmly attached to the valve body on the side where the compression allowance is large, and the center with a small compression allowance The rotating torque of the valve body is reduced by contacting with the valve body at the portion.
[ 0010 ]
A concave groove having a width and a depth into which an engagement convex portion formed on the inner peripheral surface of the valve body is engaged is formed around the outer peripheral surface in the central portion of the outer peripheral surface of the seat ring. The outer diameter of the seat ring is not formed so as to be in close contact with the inner surface of the valve body in the concave groove portion (portion A in FIG. 13), but is formed in a gentle contact state. On the other hand, both side portions (B and C portions in FIG. 13) of the concave groove are formed to have an outer diameter dimension that is tightly pressure-bonded to the inner peripheral surface of the valve body to form a tight contact state. As a result, the seat ring is inserted and held on the inner peripheral surface of the valve body at the B and C portions on both sides of the concave groove, the sealing performance is exhibited, and the portion of the angled seat portion where the valve body is in pressure contact (A portion In this case, the movement of the A portion of the seat ring is allowed in accordance with the contact of the valve body, and the rotational torque of the valve body can be reduced.
[ 0011 ]
That is, by making the compression allowance of the seat ring different in the portions A, B, and C, it is possible to simultaneously achieve reciprocal torque reduction and sealing force retention. In addition, in the central portion where the compression allowance is small, the engaging convex portion provided in the central portion of the valve body is engaged with the concave groove provided in the outer peripheral surface of the seat ring, and the protrusion and the concave groove are engaged. The movement of the seat ring is constrained, and the seat ring is prevented from peeling off from the valve body due to the suction force of the fluid or contact with the valve body.
[ 0012 ]
A chevron-shaped seat portion projecting in the inner diameter direction is formed on the inner peripheral surface of the seat ring, and the outer peripheral surface of the valve body is pressure-bonded to the chevron-shaped seat portion to achieve valve closing. The chevron seat portion is formed to have the largest width at a position orthogonal to the valve shaft hole penetrating the seat ring in the diametric direction, and gradually decreases as the valve shaft hole is approached. It is the smallest. As a result, the contact pressure with the valve body can be made substantially uniform over the entire inner peripheral surface of the seat ring, the sealing force can be made uniform, and fluid leakage due to seal leakage can be prevented.
[ 0013 ]
An inclined surface is formed between the inner peripheral surface and the outer peripheral side surface of the seat ring, and the angle formed by the inclined surface and the outer peripheral side surface and the width of the inclined surface are the largest at a position orthogonal to the valve shaft, and the largest at the valve shaft position. Make it smaller. From the valve axis orthogonal position where the width and angle of the slope are the largest to the smallest valve axis position, the curved surface follows the cosine curve. By forming a slope between the inner and outer peripheral surfaces of the seat ring, the gap between the valve element tip and the inner peripheral surface of the seat ring is sufficiently wide at the minute opening of the valve element. In this case, the suction force on the orifice side, which is the largest at the valve axis orthogonal position, can be reduced, and the suction amount of the seat ring can be made as small as possible, thereby preventing the peeling and damage of the seat ring.
[ 0014 ]
【Example】
Referring to FIGS. 1 and 2, (1) is an aluminum die-cast valve body through which a cylindrical channel (101) is provided. A seat ring made of an elastic sealing material such as rubber is provided inside the valve body. (2) is detachably mounted and sets the substantial diameter of the channel (101). (3) is a disc-like valve body pivotally supported by the valve rod (4) in the seat ring (2), and the seat ring (2) The flow path is opened and closed by being brought into contact with and separating from the inner peripheral surface. The valve stem (4) is rotatably supported by valve stem support portions (102) and (103) extending outward in the diameter direction from the valve body (1). One of the valve stems (401) extends long outward from the valve stem support portion (102) through the valve stem tube portion (5), and an actuator (6) for driving and rotating the valve stem is provided at the outer end thereof. Connected. The actuator (6) is not limited to the illustrated manual gear type, and actuators of various mechanisms such as a lever type, an electric type, and an air cylinder type can be used.
[ 0015 ]
As described above, the valve body (1) is provided as an aluminum die-cast or cast product, and the seat ring is a vulcanized product of an elastic sealing material such as rubber. The valve body (3) is an aluminum die-casting or cast molding or press-processed product similar to the valve main body (1). The valve stem (4) is a machined molded product or a drawn product from a round bar. The valve stem tube portion (5) is a synthetic resin molded product such as nylon, ABS, PBT, PPS or the like. The upper and lower gear boxes (601) and (602), the worm wheel (603), the worm (604), and the handle (605) of the actuator are molded from the same synthetic resin as that of the valve shaft cylinder. The worm wheel (603), the worm (604) and the handle (605) are not necessarily made of synthetic resin.
[ 0016 ]
Referring to FIGS. 3 to 6, a valve body (1) made of aluminum die-casting has a cylindrical flow passage (101) provided therein, and a valve stem shaft support portion (102) extending radially outward from the outer peripheral surface. (103) is extended. At the center of the inner peripheral surface of the valve body, an engagement convex portion (104) having a width approximately half that of the inner peripheral surface is formed surrounding the inner peripheral surface. When the seat ring (2), which will be described later, is mounted, the engagement convex portion (104) can make a compression allowance for the seat ring (2) different from the both side portions of the engagement convex portion, which will be described later. In addition, the rotational torque of the valve body (3) is reduced.
[ 0017 ]
As shown in FIGS. 4 to 6, the valve stem support (102) (103) has a valve stem hole (108) penetrating from the inside to the outside, and the upper valve stem support (102) The valve shaft cylinder (5) is connected. As shown in FIGS. 4 to 6, a concave portion (105) is formed at the upper end of the upper valve stem shaft support portion (102), and a protrusion (501) formed at the lower portion of the valve shaft cylinder portion (5). Can be fitted. A fitting protrusion (106) protrudes from the inner peripheral wall surface facing the recess (105). This fitting ridge (106) is fitted into a fitting groove (503) formed on the outer peripheral surface of the protrusion protruding from the lower part of the valve shaft cylinder (5) described later. Similar to the mating groove (503), no draft is provided, and the fitting protrusion and the fitting groove can be accurately fitted. Further, when the valve is fully closed, the inner corner (107) of the recess (105), which is subjected to the greatest load due to the contact with the corner of the protrusion of the valve stem (5), is increased. The thickness is increased. The position of the fitting ridge (106) is provided slightly close to the thick corner (107) instead of the center. As a result, the valve closing driving force can be collectively borne and the strength can be improved.
[ 0018 ]
The upper valve stem (401) having the lower end connected to the valve body (3) has a required length and extends upward through the upper valve stem shaft support portion (102) and the valve shaft cylinder portion (5). It is driven and rotated by an actuator (6) connected to the upper end. The upper valve stem (401) is inserted through the upper bush (403) in the upper valve stem shaft support (102). Referring to FIGS. 7 and 8, the upper bush (403) is formed of a short cylindrical body penetrating vertically, and an O-ring (406) that seals between the outer peripheral surface and the inner peripheral surface of the upper valve stem shaft support portion (102). ) Is formed in the groove (408). Further, an O-ring (409) is also inserted on the inner surface of the upper end of the upper bush (403) to seal between the upper valve stem. Further, in the middle of the upper valve stem (401), there is formed a groove (410) for engaging the press plate divided into two (411) (see FIG. 2), and the press plate (411) The valve stem (401) is prevented from being pulled out by screwing to the inner bottom surface of the concave portion (105) of the upper valve stem support portion (102).
[ 0019 ]
A short lower valve stem (402) is inserted from below into the lower valve stem support (103) and connected to the valve body (3), and a short cylindrical lower bush (404) is connected to the lower valve stem (402). The lower surface is supported by a fixing pin (405) driven in from the lateral direction, and is pivotally supported in the removal state. As shown in FIGS. 9 and 10, the lower bush (404) is formed of a short cylinder with the upper surface opened and the lower surface closed, and is inserted into the lower valve stem (402) in a cap shape from below and the upper end is seat ring ( Insert into 2) and seal the shaft. A groove (408) for mounting the O-ring (406) is formed on the outer peripheral surface of the bush so as to seal between the inner peripheral surface of the lower valve stem shaft support portion (103). A prismatic knob portion (407) projects from the closed lower surface, and the bush can be easily taken out using desired gripping means such as nippers and pliers. In addition, the bottom bush (404) is closed at the bottom, so that leakage of fluid to the outside can be prevented, and sealing with an O-ring effectively prevents fluid leakage to the outer periphery of the bush and entry from outside. Can be prevented. Furthermore, just by inserting the bush into the lower valve stem and driving the fixing pin (405), the open end of the bush (404) can be brought into close contact with the seat ring to achieve the shaft seal of the lower valve stem. It becomes easy to automate the shaft seal.
[ 0020 ]
Referring to FIGS. 11 and 12, the seat ring (2) is made of an elastic sealing material such as rubber and vulcanized. A chevron-shaped seat portion (201) protruding in the inner diameter direction is formed on the inner peripheral surface of the seat ring (2), and the outer peripheral surface of the valve body is pressure-bonded to the chevron-shaped seat portion (201) to close the valve. Is achieved. The chevron seat portion (201) is formed to have the largest width at a position orthogonal to the valve shaft hole (202) penetrating the seat ring (2) in the diametrical direction, and gradually increases as the valve shaft hole (202) is approached. Decreases and becomes the smallest at the periphery of the boss portion of the valve shaft hole. As a result, the contact pressure with the valve body (3) can be made substantially uniform over the entire inner peripheral surface of the seat ring, and the sealing force can be made uniform to prevent fluid leakage due to seal leakage.
[ 0021 ]
A slope (203) is formed between the inner peripheral surface and the outer peripheral side surface of the seat ring (2). The angle formed by the inclined surface (203) and the outer peripheral side surface and the width of the inclined surface are the largest at a position orthogonal to the valve shaft and the smallest at the valve shaft position. And from the valve axis orthogonal position where the width and angle of the slope are the largest to the smallest valve axis position, it continues with a curved surface following the cosine curve. By forming a slope (203) between the inner and outer peripheral surfaces of the seat ring (2), the gap between the valve element tip and the seat ring inner peripheral surface is sufficiently wide at a slight opening of the valve element. Therefore, the suction force on the orifice side, which is the largest at the position perpendicular to the valve axis at a small opening, can be reduced, the suction amount of the seat ring can be made as small as possible, and the peeling and damage of the seat ring can be prevented. It becomes possible. The structure of such a seat ring is disclosed in detail in Japanese Patent No. 3188680.
[ 0022 ]
A concave groove (204) is formed around the outer peripheral surface in the central portion of the outer peripheral surface of the seat ring (2). The concave groove (204) has a width and a depth into which an engaging convex portion (104) formed on the inner peripheral surface of the valve body is engaged. The outer diameter of the seat ring (2) is not formed so as to be in close contact with the inner surface of the valve body in the concave groove (204) (A portion in FIG. 13), but in a loose contact state. Has been. On the other hand, both side portions (B and C portions in FIG. 13) of the concave groove are formed to have an outer diameter dimension that is tightly pressure-bonded to the inner peripheral surface of the valve body to form a tight contact state. As a result, the seat ring (2) is inserted and held on the inner peripheral surface of the valve body (1) at the B and C portions on both sides of the concave groove, the sealing performance is exhibited, and the valve body (3) is in pressure contact. Oite the portion of the chevron seat (corresponding to the a section) becomes a possible deviation movement a portion of the seat ring with the contact of the valve body is allowed, reducing the rotational torque of the valve body (3) It becomes possible. That is, by reducing the compression allowance of the seat ring (2) in the portions A, B, and C, it is possible to simultaneously achieve a reciprocal torque reduction and a sealing force retention.
[ 0023 ]
The seat ring (2) is in a gentle contact state at the A portion, but is attached to and closely adhered to the inner peripheral surface of the valve body (1) at the B and C portions with a sufficient compression rate. The seat ring can be firmly attached to the valve body at the portion C, and the seat ring is prevented from being peeled off or damaged by the fluid pressure. The portion A where the valve body is brought into pressure contact to achieve a seal is not tightly pressure-bonded to the inner peripheral surface of the valve body, and as a result of allowing movement associated with the valve body when in contact with the valve body (3), the valve The rotating torque of the body is reduced, unnecessary compression by the valve body is prevented, and only the compression necessary for sealing can be applied to the rubber, so the seat ring has a small compression rate and prevents deterioration of the rubber It becomes possible to do. This conversely makes it possible to use a material having a relatively low tear strength, such as silicon rubber, for the seat ring.
[ 0024 ]
Referring to FIGS. 14 and 15, the valve body (3) has a basic disk shape, and has an inclined surface whose thickness gradually decreases toward the outer periphery as shown in FIG. 15. While being formed, vertical ribs (302) extending in the axial direction at the center of the valve body surface are formed in a state where the boss portions of the upper and lower valve stem holes (301) are connected. In addition, three lateral ribs (303) (304) (305) extending substantially in parallel with the direction orthogonal to the valve axis direction are formed on the nozzle side and orifice side surfaces of the valve body. Each lateral rib (303) (304) (305) has a certain height from the valve body surface, and the direction of the fluid flowing near the valve body surface is controlled by the rib.
[ 0025 ]
That is, the central lateral rib (304) is located at the maximum flow velocity portion in the pipe, bisects the maximum flow velocity, and accelerates the flow velocity. The lateral ribs (303) and (305) arranged above and below the central rib are inclined toward the central lateral rib, and the fluid in the low speed region near the tube wall is directed toward the central rib, and is accelerated by the central rib. The speed is increased while being drawn to the flow rate. For fluid, the boss portion of the upper and lower valve stem holes (301) provides flow resistance, and the fluid that collides with the boss portion generates a vortex on the secondary side of the boss portion, further increasing the fluid resistance. On the other hand, the three horizontal ribs exert a rectifying effect on the vortex generated on the secondary side of the boss portion, and reduce the generation of the vortex. As a result, the three horizontal ribs divide and rectify the flow velocity in the pipe in the vicinity of the valve body, complement the fluid resistance of the pipe wall and the fluid resistance of the valve body surface by the flow direction control of the rib part, It has the effect of reducing the fluid resistance.
[ 0026 ]
Referring to FIGS. 2 and 16 to 19, the valve shaft cylinder portion (5) is a substantially rectangular tube-shaped cylinder having a required length formed of nylon, and the upper valve stem (401) And extends upward. A protrusion (501) that fits into a recess (105) formed in the upper valve stem shaft support portion (102) of the valve body (1) is formed at the lower portion of the valve shaft cylinder portion (5). A support plate portion (502) for mounting and supporting the lower gear box (601) of the actuator (6) is formed. The protrusion (501) has an outer peripheral surface shape that follows the inner peripheral surface shape of the recess (105), can be fitted, and is a fitting protrusion formed on the opposing inner surface of the recess (105). A fitting groove (503) into which is inserted is recessed in the outer peripheral surface. The fitting groove (503) is formed at a position slightly shifted from the center in alignment with the position of the fitting protrusion (106). A valve stem hole (504) vertically penetrates the center of the valve shaft cylinder. Further, a pin hole (506) for driving the connecting pin (505) is formed on the surface of the protrusion (501) where the fitting groove (503) is not formed. Bolt insertion holes (507) are drilled in the four corners of the support plate (502).
[ 0027 ]
In joining the valve body (1) and the valve shaft tube portion (5), first, the fitting protrusion (106) is engaged with the fitting groove (503) while the concave portion of the upper valve stem shaft support portion (102) ( 105) Fit and drive the protrusion (501) at the bottom of the valve stem (5). Next, the connecting pin (505) is driven from the lateral direction into the upper valve stem shaft support portion (102) and the valve shaft tube portion (5) to join them together. The upper valve stem shaft support portion (102) and the valve shaft tube portion (5) are fitted in a rectangular tube shape of the recess (105) and the protrusion (501), the fitting protrusion (106) and the fitting groove (503). Precise position, size, and shape)), combined with driving of the connecting pin, can reliably prevent torsional stress from the actuator (6) and axial removal. It is possible to achieve extremely strong and stable bonding.
[ 0028 ]
As described above, the concave portion (105) and the protruding portion (501) only need to achieve a square fitting, and it is not necessary to make a precise fitting in the square shape over the entire joining surface. Since only the fitting protrusion (106) and the fitting groove (503) are processed, there are few portions that require processing accuracy, and processing as a whole can be facilitated and cost reduction can be achieved. Further, since the axial direction is prevented by driving the connecting pin, the valve body and the valve shaft made of different materials such as metal and synthetic resin are combined with the connecting structure for preventing the torsional stress. The tube portion can be firmly and stably joined. As a result, the valve body with a complicated structure is made by metal processing that is relatively easy to mold, such as aluminum die casting, and the valve stem is made of a heat-insulating material. It becomes easy to do.
[ 0029 ]
2 and 20 to 22, the actuator (6) is pivotally supported in a gear box formed by joining the lower gear box (601) and the upper gear box (602). A worm wheel (603) and a worm (604) meshing with the worm wheel are provided. The upper end of the upper valve stem (401) is connected to the worm wheel (603) in a non-rotating state, and the handle shaft (606) is connected to the worm (604). A handle (605) is attached to the outer end of the handle shaft (606). The upper and lower gear box is assembled with a worm wheel and a worm, and is placed on the support plate portion (502) above the valve shaft cylinder portion (5) and fastened with bolts and nuts to be inserted. (607) is an opening degree indicator plate integrally planted on the worm wheel (603), and projects upward from the upper gear box to indicate the opening degree of the valve body.
[ 0030 ]
Both the upper and lower gearboxes (601) and (602) are formed of synthetic resin such as nylon, ABS, PBT, or PPS. As shown in FIG. 21, a stopper (610) for stopping the worm wheel (603) at a fully open position and a fully closed position at a rotation angle of 90 degrees is integrally formed in the upper gear box (602). Further, as shown in FIG. 22, a rising wall (608) for fitting the upper gear box is formed around the upper periphery of the lower gear box (601). Further, a seal protrusion (609) is similarly provided around the rising wall (608) around the seal protrusion (609) at a slight interval. Due to the presence of the rising wall (608), the upper and lower gear boxes can be easily and reliably combined, and the seal protrusion (609) abuts the lower surface of the upper gear box and is inserted when tightening with bolts and nuts. Sealing performance. Furthermore, when a packing is interposed between the two, the seal protrusion can compress the packing to obtain a reliable seal.
[ 0031 ]
Since the entire upper and lower gear boxes are molded of synthetic resin, the dimensional accuracy is improved and the opening degree stopper (606) can be formed integrally. As a result, since the stopper provided with the opening adjustment means by a screw like the conventional is not required, the whole structure can be simplified and cost reduction can be aimed at. Moreover, dew condensation can be effectively prevented by using a synthetic resin having heat insulation properties. Furthermore, it becomes easy to make a grease-less structure using a resin having high lubricity. Encapsulating grease in the gear box is a very useful structure because it is possible to eliminate the problem of contamination of the indoor floor and wall surface due to grease leakage from the current situation where this kind of butterfly valve is arranged indoors.
[ 0032 ]
【The invention's effect】
According to the present invention, the seat ring can be mounted on the inner peripheral surface of the valve body with a sufficiently large elastic clamping force so that the seat ring can be stably attached, and the rotational torque of the valve body can be reduced. .
[Brief description of the drawings]
FIG. 1 is a perspective view of the entire appearance. FIG. 2 is an exploded perspective view of the whole. FIG. 3 is a longitudinal sectional view of the whole with the actuator removed. Side view [Fig. 6] Plan view [Fig. 7] Perspective view of upper bush [Fig. 8] Section view [Fig. 9] Perspective view of lower bush [Fig. 10] Section view [Fig. 11] Fig. 12 is a side view of the seat ring. Fig. 12 is a cross-sectional view of the seat ring at different positions. Fig. 13 is an enlarged cross-sectional view of the main part showing the mounting structure of the seat ring and the valve body. ] Plan view of valve body [Fig. 16] Front view of valve shaft tube [Fig. 17] Side view [Fig. 18] Plan view [Fig. 19] Bottom view [Fig. 20] Exploded perspective view of actuator [Fig. ] Figure showing the inside of the upper gearbox [Figure 22] Cross-sectional view showing the details of the joint of the upper and lower gearbox
(1) Valve body
(101) Flow path
(102) (103) Valve stem support
(104) Engaging projection
(105) Recess
(106) Mating ridge
(107) Corner
(108) Valve stem hole
(2) Seat ring
(201) Yamagata seat
(202) Valve shaft hole
(203) Slope
(204) Concave groove
(3) Valve body
(301) Valve stem hole
(302) Vertical rib
(303) (304) (305) Horizontal rib
(4) Valve stem
(401) Upper valve stem
(402) Lower valve stem
(403) Upper bush
(404) Lower bush
(405) Fixing pin
(406) O-ring
(407) Knob part
(408) Groove
(409) O-ring
(410) Groove
(411) Presser plate
(5) Valve shaft cylinder
(501) Projection
(502) Support plate
(503) Mating groove
(504) Valve stem hole
(505) Connecting pin
(506) Pin hole
(507) Bolt insertion hole
(6) Actuator
(601) Lower gearbox
(602) Upper gearbox
(603) Warm wheel
(604) Warm
(605) Handle
(606) Handle shaft
(607) Opening indicator
(608) Rising wall
(609) Sealing ridge
(610) Stopper

Claims (2)

Seat ring made of an elastic sealing material (2) is mounted in a cylindrical flow path valve body (1) in that penetrated the disk-shaped valve body approaching and moving away from the said seat ring (2) and (3) The valve body ( 1 ) is pivotally supported to form the valve body shaft support part (102) (103) in the diameter direction of the valve body ( 1 ) , and the valve body ( 3 ) is supported to support the valve body ( 4 ) . In addition, in the butterfly valve in which the actuator ( 6 ) is connected to the outer end of one valve stem ( 4 ) to drive and rotate the valve element ( 3 ) , the central portion of the inner peripheral surface of the valve body ( 1 ) The engaging projection (104) is formed around the inner peripheral surface of the valve body ( 1 ) by projecting in the direction, and the concave groove (204) into which the engaging projection (104) is engaged is formed in the seat ring ( 2) ambient formed on the outer peripheral surface of the engaging projection (104) and grooves (204) of the central portion (a) the valve body (1) inner peripheral surface of the seat ring engaging (2) Reduce the compression allowance of the seat ring ( 2 ) by making it in a gentle contact state without tightly crimping At the same time, the both sides ( B, C ) of the recessed groove (204) of the seat ring are tightly pressure-bonded to the both sides of the engaging projection (104) on the inner peripheral surface of the valve body ( 1 ). The compression allowance of ( 2 ) is increased, the seat ring ( 2 ) is held on the inner peripheral surface of the valve body ( 1 ) by the elastic tightening force at both sides, and the valve body ( 3 ) is kept in the gentle contact state. The central part of the seat ring ( 2 ) is caused to follow the rotational direction of the valve body ( 3 ) by allowing the slight movement of the valve body ( 3 ) , thereby reducing the rotational torque of the valve body ( 3 ) . A butterfly valve seat ring.   A slope is formed between the inner peripheral surface and the outer peripheral side surface of the seat ring, and the angle and width formed by the inclined surface and the outer peripheral side surface are the largest at the valve shaft orthogonal position and the smallest at the valve shaft position. The seat ring according to claim 1.

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