JP6084492B2 - Valve assembly - Google Patents

Description

  The present invention relates to a valve assembly arranged in a flow path and capable of adjusting a flow rate of a fluid.

  Patent Documents 1 and 2 disclose a valve assembly. The valve assembly includes a butterfly valve. A ring groove is formed in the outer peripheral edge of the valve body of the butterfly valve. A seal ring is disposed in the ring groove. By rotating the valve body in the flow path, the valve assembly can open and close the flow path.

JP-A-7-269718 JP 2008-223505 A

  A gap is secured between the inner peripheral surface of the seal ring and the groove bottom of the ring groove in order to ensure elastic deformation in the radial direction of the seal ring. That is, when the shape accuracy of the valve body or the housing is low, the assembly error is large, or the thermal deformation is large, the valve body and the housing are displaced. In order to absorb the deviation, a gap is secured between the inner peripheral surface of the seal ring and the groove bottom portion of the ring groove.

  On the other hand, when the valve body rotates in the flow path, the seal ring comes into sliding contact with the housing. For this reason, the seal ring may be displaced from the ring groove as the seal ring slides.

  Here, in order to suppress the displacement of the seal ring accompanying the rotation of the valve body, the gap between the inner peripheral surface of the seal ring and the groove bottom of the ring groove may be reduced. That is, it is only necessary to reduce the radial deformation allowance of the seal ring.

  However, if the radial deformation allowance of the seal ring is reduced, if foreign matter enters between the inner peripheral surface of the seal ring and the groove bottom of the ring groove, the elastic deformation in the radial direction of the seal ring is hindered. . For this reason, it becomes difficult to absorb the displacement between the valve body and the housing due to shape accuracy, assembly error, thermal deformation, and the like due to elastic deformation of the seal ring.

  Therefore, an object of the present invention is to provide a valve assembly in which the elastic deformation in the radial direction of the seal ring is hardly hindered even when foreign matter enters between the ring groove and the seal ring.

  (1) In order to solve the above-described problem, a valve assembly of the present invention includes a rotatable valve shaft, and a disc-shaped valve body that is connected to the valve shaft and has a ring groove recessed in an outer peripheral edge. A butterfly valve, a seal ring disposed in the ring groove and elastically deformable in a radial direction, and a housing in which the valve body is disposed and defines a flow path through which a fluid flows, and the valve body rotates. Thus, the valve assembly is capable of adjusting the cross-sectional area of the flow path, wherein the fluid contains foreign matter, and at least one of a groove bottom portion of the ring groove and a radially inner end portion of the seal ring. Provided with a protruding portion that is arranged on one side, protrudes in the radial direction and can contact the other, and defines a foreign matter storage portion that can store the foreign matter between the bottom of the groove and the radially inner end portion. It is characterized by. Here, “radial direction” refers to the radial direction of the valve element of the butterfly valve.

  The valve assembly of the present invention includes a protrusion. The protrusion is disposed on at least one of the bottom of the ring groove and the radially inner end of the seal ring. When the protruding portion is disposed at the groove bottom portion of the ring groove, the protruding portion protrudes radially outward and can contact the radially inner end of the seal ring. For this reason, elastic deformation in the radial direction of the seal ring can be allowed between the radially inner end of the seal ring and the protruding portion. In addition, when the protruding portion is disposed, the foreign substance accommodating portion can be partitioned between the groove bottom portion and the radially inner end portion. For this reason, it can suppress that the foreign material which entered between the ring groove and the seal ring inhibits the elastic deformation of the seal ring.

  On the other hand, when the protrusion is disposed at the radially inner end of the seal ring, the protrusion protrudes radially inward and can contact the groove bottom of the ring groove. For this reason, elastic deformation in the radial direction of the seal ring can be allowed between the protrusion and the groove bottom of the ring groove. In addition, when the protruding portion is arranged, the foreign substance accommodating portion can be partitioned between the protruding portion and the groove bottom portion. For this reason, it can suppress that the foreign material which entered between the ring groove and the seal ring inhibits the elastic deformation of the seal ring.

  In this way, when the protruding portion is arranged, the radial deformation allowance of the seal ring can be reduced accordingly. In addition, when the protruding portion is disposed, the foreign substance accommodating portion can be partitioned between the groove bottom portion and the radially inner end portion. For this reason, according to the valve assembly of the present invention, the displacement of the valve body and the housing due to shape accuracy, assembly error, thermal deformation, etc. is suppressed while suppressing the displacement of the seal ring accompanying the rotation of the valve body. It can be absorbed by elastic deformation.

  (2) Preferably, in the configuration of the above (1), the protruding portion protrudes radially outward from the groove bottom portion of the ring groove, and can contact the radially inner end portion of the seal ring. Is better. According to this configuration, the elastic deformation in the radial direction of the seal ring can be allowed between the radially inner end portion of the seal ring and the protruding portion.

  (2-1) Preferably, in the configuration of the above (2), the protruding portion is preferably formed integrally with the groove bottom portion of the ring groove. According to this configuration, the number of parts of the valve assembly is reduced.

  (2-2) Preferably, in the configuration of the above (2), the projecting portion may be a pin separate from the groove bottom portion of the ring groove. According to this configuration, the valve assembly of the present invention can be realized by retrofitting a pin to an existing valve assembly. For this reason, versatility is high.

  (3) Preferably, in the configuration of the above (2), the protruding portion may be configured to be capable of point contact or line contact with the radially inner end portion of the seal ring. According to this structure, when a protrusion part contacts the radial direction inner end part of a seal ring, the pressure of the protrusion part with respect to a radial direction inner end part can be enlarged. For this reason, even if it is a case where a foreign material is caught between the protrusion part and the radial direction inner end part of a seal ring, the said foreign material can be crushed with pressure. Therefore, the foreign matter can be accommodated in the foreign matter accommodating portion in a finer state.

  (4) Preferably, in the configuration according to any one of (1) to (3), the housing is disposed in the flow path, and a partially back spherical shape in which the seal ring is slidably contacted when the valve body rotates. It is better to have a configuration having a sheet surface. Here, the “back spherical surface shape” refers to the shape of the back surface of the hollow sphere.

  According to this configuration, the housing includes a partially back spherical sheet surface. For this reason, a seal ring and a seat surface can be made to contact reliably irrespective of the shape of the outer periphery of a seal ring. Therefore, the sealing performance in the fully closed state is increased. In addition, the degree of freedom of the shape of the seal ring is increased.

  According to the present invention, it is possible to provide a valve assembly in which the elastic deformation in the radial direction of the seal ring is hardly hindered even when foreign matter enters between the ring groove and the seal ring.

It is a perspective view of the valve assembly used as one embodiment of the present invention. It is a perspective view of the butterfly valve of the valve assembly. It is a disassembled perspective view of the butterfly valve. FIG. 4 is a sectional view in the IV-IV direction of FIG. 1. It is an enlarged view in the circle V of FIG. It is sectional drawing seen from the upper direction in the half open state of the butterfly valve of the valve assembly. It is sectional drawing seen from the upper direction in the fully open state of the butterfly valve. It is an expanded sectional view near a seal ring of a valve assembly of other embodiments (the 1). It is an expanded sectional view near a seal ring of a valve assembly of other embodiments (the 2). It is a vertical cross-sectional view of the vicinity of the valve body of the valve assembly reference type status. It is an expanded sectional view near a seal ring of a valve assembly of other embodiments (the 3 ).

  Hereinafter, embodiments of the valve assembly of the present invention will be described.

<Configuration of valve assembly>
First, the configuration of the valve assembly of this embodiment will be described. The valve assembly of this embodiment is disposed in an EGR (Exhaust Gas Recirculation) passage. In the following drawings, the rear corresponds to the downstream side of the EGR passage, and the front corresponds to the upstream side of the EGR passage.

  FIG. 1 shows a perspective view of the valve assembly of the present embodiment. FIG. 2 is a perspective view of the butterfly valve of the valve assembly. FIG. 3 shows an exploded perspective view of the butterfly valve. FIG. 4 shows a cross-sectional view in the IV-IV direction of FIG. FIG. 5 shows an enlarged view in the circle V of FIG. FIG. 6 shows a cross-sectional view of the butterfly valve of the valve assembly as seen from above in the half-open state. FIG. 7 shows a cross-sectional view of the butterfly valve as viewed from above in the fully opened state.

  As shown in FIGS. 1 to 7, the valve assembly 1 of this embodiment includes a housing 40, a butterfly valve 42, a seal ring 43 (shown by hatching in FIG. 2), and a protrusion 44. .

  The housing 40 includes a housing main body 400 and a sleeve 401. The housing body 400 is made of stainless steel and has a rectangular parallelepiped shape. The housing main body 400 has a hole extending in the front-rear direction (the passage extending direction of the EGR passage 91). The sleeve 401 is made of stainless steel and has a cylindrical shape. The sleeve 401 is fitted into the hole of the housing main body 400. As shown in FIG. 4, a gas passage A through which exhaust gas passes is defined inside the sleeve 401 in the radial direction. The sleeve 401 includes a seat surface a that is exposed to the gas passage A. As shown in FIG. 5, soot P is contained in the exhaust. Exhaust is included in the “fluid” concept of the present invention.煤 P is included in the concept of “foreign matter” of the present invention. The gas passage A is included in the concept of the “flow path” of the present invention.

  The gas passage A extends in a straight line extending in the front-rear direction. As shown by the alternate long and short dash line in FIG. 4, the sheet surface a has a partially back spherical shape with a radius of curvature r1. The width of the seat surface a in the direction perpendicular to the gas passage extending direction (front-rear direction) (left-right direction, up-down direction) gradually increases toward the rear (downstream side).

  The butterfly valve 42 includes a valve shaft 420, a valve body 421, a pair of bolts 422, and a detent pin 423. The valve shaft 420 is made of stainless steel and has a round bar shape. The valve body 421 is made of stainless steel and has a disk shape. As shown in FIG. 4, in the fully closed state, the valve body 421 is disposed in front (upstream side) of the valve shaft 420. That is, the center (axial direction and radial direction center) O2 of the valve body 421 is shifted forward with respect to the axis O1 of the valve shaft 420. As shown by hatching in FIG. 3, a ring groove 421 a is formed on the outer peripheral edge of the valve body 421 so as to be entirely circumferential. From the left end of the ring groove 421a (the front end in the rotational direction of the valve body 421 when switching from the fully open state shown in FIG. 7 to the fully closed state shown in FIG. 4), the rotation preventing pin 423 is on the left side (the radially outer side of the valve body 421). Is projected. The pair of bolts 422 fixes the valve body 421 to the valve shaft 420.

  As shown in FIG. 3, the seal ring 43 is made of stainless steel and has an end ring shape, that is, a C shape. A gap B <b> 1 is set between one end of the C shape and the other end of the C shape of the seal ring 43. The seal ring 43 is disposed in the ring groove 421a of the valve body 421. The radial cross section of the seal ring 43 has a rectangular shape. A detent pin 423 is relatively inserted in the gap B1 of the seal ring 43. The anti-rotation pin 423 suppresses the seal ring 43 from moving in the circumferential direction with respect to the ring groove 421a.

  As shown in FIG. 5, the protruding portion 44 protrudes radially outward from the groove bottom portion 421b of the ring groove 421a. The radial cross section of the projecting portion 44 has a triangular shape that is pointed outward in the radial direction. On both sides of the projecting portion 44 in the front-rear direction (the axial direction of the valve body 421), a foreign substance containing portion 441 is defined. The foreign matter storage part 441 stores the soot P in the exhaust gas that has entered between the seal ring 43 and the ring groove 421a.

  As shown in FIG. 3, the seal ring 43 can be elastically deformed in the radial direction by expanding and contracting the gap B1. As shown in FIG. 5, when the seal ring 43 is elastically reduced in diameter, the linear top portion 440 of the protruding portion 44 is in line contact with the inner peripheral surface 430 of the seal ring 43 from the radially inner side. The inner peripheral surface 430 is included in the concept of the “radially inner end portion” of the present invention.

<Valve assembly movement>
Next, the movement of the valve assembly of this embodiment will be described. The valve assembly 1 of the present embodiment has a cross-sectional area of the gas passage A between the fully closed state shown in FIG. 4 and the fully opened state shown in FIG. Thus, the cross-sectional area of the gas passage A in the orthogonal direction can be adjusted.

  As shown in FIG. 4, the gas passage A is completely blocked by the valve body 421 in the fully closed state. Here, as shown in FIG. 4, ideally, the axis O <b> 1 of the valve shaft 420 passes through the spherical center of the seat surface a. Ideally, the curvature radius r1 of the seat surface a and the distance from the axis O1 of the valve shaft 420 to the outer peripheral edge of the seal ring 43 substantially coincide with each other. In this case, the valve body 421 and the seat surface a do not shift. For this reason, even if the seal ring 43 cannot be elastically deformed, the outer peripheral edge of the seal ring 43 can be brought into full contact with the seat surface a in the fully closed state.

  However, in reality, when the shape accuracy of the valve body 421 and the seat surface a is low, when the assembly error (for example, the assembly error between the valve shaft 420 and the valve body 421 shown in FIG. 3) is large, thermal deformation occurs. For example, when it is large, the axis O1 of the valve shaft 420 does not pass through the spherical center of the seat surface a. Further, the radius of curvature r1 of the seat surface a and the distance from the axis O1 of the valve shaft 420 to the outer peripheral edge of the seal ring 43 do not match. Further, the curvature radius r1 of the sheet surface a is not constant. For this reason, the valve body 421 and the seat surface a shift.

  In this regard, as shown in FIG. 5, the seal ring 43 is elastic by an amount corresponding to the gap B <b> 2 with respect to an unloaded state (a state in which the seal ring 43 is not in contact with the seat surface “a”) shown in FIG. 5. It can be deformed. That is, the seal ring 43 can be elastically deformed radially inward while reducing the gap B1 shown in FIG. 3 with respect to the no-load state shown by the one-dot chain line in FIG. For this reason, even when the valve body 421 and the seat surface a are deviated, by utilizing the “deviation adjustment allowance” called the gap B2, as shown by the bold dotted line in FIG. That is, a seal part can be formed. That is, in the fully closed state, the outer peripheral edge of the seal ring 43 can be brought into full contact with the seat surface a.

  As shown in FIG. 6, in the half-open state, the gas passage A is partially opened by the valve body 421. Here, the sheet surface a has a partially back spherical shape. On the other hand, the seal ring 43 is elastically deformable in the radial direction. For this reason, as shown by a thick dotted line in FIG. 6, the contact portions S can be formed at two places in the upper and lower sides (two places separated in the extending direction of the valve shaft 420). That is, in the half-opened state, the outer peripheral edge of the seal ring 43 can be brought into contact with the seat surface a at two locations, upper and lower. In other words, two places of the seal ring 43 can be supported by the seat surface a.

  As shown in FIG. 7, in the fully opened state, the gas passage A is completely opened by the valve body 421. As shown by a thick dotted line in FIG. 7, the contact portions S can be formed at two upper and lower positions in the fully open state as in the half open state. In other words, two places of the seal ring 43 can be supported by the seat surface a.

<Effect>
Next, the function and effect of the valve assembly of this embodiment will be described. According to the valve assembly 1 of the present embodiment, the seat surface a has a partially back spherical shape. For this reason, regardless of the shape of the outer peripheral edge of the seal ring 43, the seal ring 43 and the seat surface a can be reliably brought into contact with each other. Therefore, the sealing performance in the fully closed state is increased. Further, the degree of freedom of the shape of the seal ring 43 is increased.

  Further, according to the valve assembly 1 of the present embodiment, as shown in FIG. 5, the gap B <b> 2 is secured between the inner peripheral surface 430 of the unloaded seal ring 43 (one-dot chain line) and the top 440. ing. Therefore, the seal ring 43 can be elastically deformed radially inward while reducing the gap B1 shown in FIG. Therefore, even if the valve body 421 and the seat surface a are displaced due to shape accuracy, assembly error, thermal deformation, etc., the bold line in FIG. As shown by the figure, an annular contact portion S, that is, a seal portion can be formed. That is, in the fully closed state, the outer peripheral edge of the seal ring 43 can be brought into full contact with the seat surface a.

  Further, according to the valve assembly 1 of the present embodiment, as shown in FIG. 3, the seal ring 43 has an end ring shape. For this reason, the seal ring 43 can be easily elastically deformed in the radial direction by expanding and contracting the gap B1.

  Further, as shown in FIG. 5, a foreign matter container 441 is defined between the groove bottom 421 b and the inner peripheral surface 430. The spear P that has entered between the ring groove 421a and the seal ring 43 is accommodated in the foreign matter accommodating portion 441. Therefore, the elastic deformation in the radial direction of the seal ring 43 can be allowed by the gap B5 (the gap between the top portion 440 and the inner peripheral surface 430). Thus, according to the valve assembly 1 of the present embodiment, the elastic deformation in the radial direction of the seal ring 43 is not easily inhibited by the flange P.

  Further, as shown in FIGS. 4, 6, and 7, the position and length of the contact portion S with respect to the seal ring 43 change as the valve body 421 rotates. For example, when the fully closed state shown in FIG. 4 is switched to the half-open state shown in FIG. 6, the length of the contact portion S is shortened. Further, the position of the contact portion S moves from the entire circumference of the seal ring 43 to the vicinity of the upper and lower ends of the seal ring 43. Further, when the half-open state shown in FIG. 6 is switched to the fully-open state shown in FIG. 7, the length of the contact portion S is shortened. Further, the position of the contact portion S moves from the vicinity of both upper and lower ends of the seal ring 43 to the front (left side when facing the valve body 421, rearward in the rotation direction of the valve body 421).

  For this reason, if the protruding portion 44 shown in FIG. 5 is not disposed, the gap B4 (gap between the groove bottom portion 421b and the inner peripheral surface 430) accompanies changes in the position and length of the contact portion S. The seal ring 43 may be displaced from the ring groove 421a by the amount.

  In this regard, the valve assembly 1 of the present embodiment includes a protruding portion 44. For this reason, the gap B4 can be raised to the gap B5. That is, the radial deformation allowance of the seal ring 43 can be reduced. Therefore, when the valve body 421 rotates, the seal ring 43 is not easily displaced with respect to the ring groove 421a. On the other hand, since the gap B2 is secured, the elastic deformation of the seal ring 43 in the radial direction is hardly hindered. Therefore, the displacement between the valve body 421 and the seat surface a due to shape accuracy, assembly error, thermal deformation, and the like can be absorbed by the elastic deformation of the seal ring 43.

  Thus, according to the valve assembly 1 of the present embodiment, the position and length of the contact portion S as shown in FIGS. 4, 6, and 7 are secured while ensuring the elastic deformation of the seal ring 43 in the radial direction. The shift of the seal ring 43 accompanying the change can be suppressed.

  In particular, as shown in FIG. 4, in the case of the butterfly valve 42 in which the center O2 of the valve body 421 is deviated from the axis O1 of the valve shaft 420, that is, the valve body offset type butterfly valve 42, FIGS. As shown, the position of the contact portion S tends to be biased to one side (left side when facing the valve body 421, rearward in the rotation direction of the valve body 421) with respect to the axis O1. For this reason, the seal ring 43 tends to be displaced with the rotation of the valve body 421. Therefore, when such a valve body offset type butterfly valve 42 is used in the valve assembly 1 of the present embodiment, the effect of suppressing the deviation of the valve assembly 1 when the valve body 421 rotates can be utilized to the maximum extent. it can.

  Further, according to the valve assembly 1 of the present embodiment, as shown in FIG. 5, the protruding portion 44 is formed integrally with the groove bottom portion 421b of the ring groove 421a. For this reason, the number of parts of the valve assembly 1 is reduced.

  Further, according to the valve assembly 1 of the present embodiment, as shown in FIG. 5, the top portion 440 of the protruding portion 44 is in line contact with the inner peripheral surface 430 of the seal ring 43 on the entire circumference. For this reason, even when the ridge P is caught between the top portion 440 and the inner peripheral surface 430, the linear top portion 440 passes through the pressure (from the seat surface a via the seal ring 43 and the ridge P).圧 力 P can be pulverized by the pressure of the reaction force of the load F applied to. Therefore, the bag P can be accommodated in the foreign matter accommodating portion 441 in a finer state.

  Further, according to the valve assembly 1 of the present embodiment, the seat surface a and the seal ring 43 are both made of stainless steel. For this reason, in the contact part S, a metal touch can be ensured. Therefore, sealing performance, heat resistance, and pressure resistance are high.

<Others>
The embodiment of the valve assembly of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  FIG. 8 shows an enlarged cross-sectional view of the vicinity of the seal ring of the valve assembly of the other embodiment (part 1). FIG. 9 is an enlarged cross-sectional view of the vicinity of the seal ring of the valve assembly of the other embodiment (part 2). In FIGS. 8 and 9, parts corresponding to those in FIG.

  As shown in FIG. 8, the radial section of the protrusion 44 may be a square shape. That is, the top portion 440 may be planar. As shown in FIG. 9, the plurality of protrusions 44 may be arranged side by side in the axial direction of the valve body 421. And the foreign material accommodating part 441 may be partitioned between the adjacent protrusion parts 44. FIG.

10 shows a vertical cross-sectional view in the vicinity of the valve body of the valve assembly reference type status. In addition, about the site | part corresponding to FIG. 4, FIG. 5, it shows with the same code | symbol. As shown in FIG. 10, a plurality of pins 45 may be arranged at predetermined intervals in the circumferential direction of the valve body 421 . Pin 45 is protruded from the groove bottom portion 421b of the ring groove 421a, radially outward. The top portion 450 of the pin 45 supports the inner peripheral surface 430 of the seal ring 43. Between the groove bottom portion 421b and the inner peripheral surface 430, a foreign matter storage portion 441 is partitioned on the entire periphery. According to the valve assembly of the present embodiment, the foreign substance container 441 can be easily set by retrofitting the pin 45 to the existing valve assembly. For this reason, versatility is high.

FIG. 11 is an enlarged cross-sectional view of the vicinity of the seal ring of the valve assembly of the other embodiment (part 3 ). In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown in FIG. 11, the protruding portion 44 may be disposed on the inner peripheral surface 430 of the seal ring 43. Further, instead of the protruding portion 44, a protruding portion 44 shown in FIGS. 8 and 9 may be arranged. Further, the pin 45 shown in FIG. 10 may project radially inward from the inner peripheral surface 430 of the seal ring 43.

  In the above embodiment, as shown in FIG. 3, the end ring-shaped seal ring 43 is used, but an endless ring-shaped (O-shaped) seal ring may be used. Further, the seal ring 43 may be formed by connecting a plurality of partial arc-shaped ring pieces in a circular shape. A general-purpose piston ring may be diverted as the seal ring 43. In this way, the manufacturing cost of the seal ring 43 can be reduced.

  In the said embodiment, the valve assembly 1 of this embodiment was embodied as an EGR valve. However, the present invention may be embodied as a wide variety of valves used in the intake and exhaust systems, such as an exhaust side turbo bypass valve, an intake side turbo bypass valve, a throttle valve, an exhaust brake valve, and an exhaust throttle valve. Moreover, the kind of the foreign material accommodated in the foreign material accommodation unit 441 is not limited to the bag P. It may be particles, sand, dust, dust, etc. contained in the fluid.

  In the above embodiment, as shown in FIG. 4, the valve body 421 is disposed on the front side (upstream side) of the valve shaft 420, but the valve body 421 may be disposed on the rear side (downstream side) of the valve shaft 420. . In this case, the width of the seat surface a in the direction perpendicular to the passage extending direction (front-rear direction) (left-right direction, up-down direction) is gradually narrowed toward the downstream side. In the above embodiment, as shown in FIG. 4, the gas passage A extends in the front-rear direction, but the extending direction of the gas passage A is not particularly limited. The vertical direction, the horizontal direction, and the like may be used.

  The material of the housing body 400 and the sleeve 401 is not particularly limited. For example, it may be made of aluminum, cast iron, resin, or the like. Further, the sheet surface a having a partially back spherical surface may be formed directly on the housing body 400 of the housing 40 without arranging the sleeve 401.

  Further, as the butterfly valve 42, a butterfly valve in which the axis O1 and the center O2 shown in FIG. 4 overlap when viewed from above, that is, a butterfly valve of a type in which the valve element 421 is not offset with respect to the valve shaft 420 is used. It may be used.

1: valve assembly, 40: housing, 400: housing body, 401: sleeve, 42: butterfly valve, 420: valve shaft, 421: valve body, 421a: ring groove, 421b: groove bottom, 422: bolt, 423: rotation Stop pin, 43: Seal ring, 430: Inner peripheral surface (diameter inner end), 44: Projection, 440: Top, 441: Foreign substance storage, 45: Pin (projection), 450: Top, 91: EGR passage.
A: Gas passage (flow path), B1: Gap, B2: Gap, B4: Gap, B5: Gap, F: Load, O1: Axis, O2: Center, P: Wrinkle (foreign material), S: Contact part, a : Sheet surface, r1: radius of curvature.

Claims (5)

A rotatable valve shaft, and a disc-shaped valve body connected to the valve shaft and having a ring groove recessed in the outer peripheral edge;
A butterfly valve having
A seal ring disposed in the ring groove and elastically deformable in a radial direction;
A housing in which the valve body is disposed and defines a flow path through which fluid flows;
With
A valve assembly capable of adjusting a channel cross-sectional area of the channel by rotating the valve body,
The fluid contains foreign matter;
It is disposed at least one of the groove bottom portion of the ring groove and the radial inner end portion of the seal ring, protrudes in the radial direction and can contact the other, and between the groove bottom portion and the radial inner end portion. A projecting portion that divides a foreign matter container that can contain the foreign matter ,
The protrusion has a linear top portion extending in the circumferential direction,
The valve assembly characterized in that the foreign matter container is defined on both sides of the protruding portion in the axial direction (axial direction of the valve body) . 2. The valve assembly according to claim 1, wherein the top portion of the projecting portion is capable of line contact with the other of the entire circumference . 3. The valve assembly according to claim 1 , wherein the top portion of the protruding portion protrudes radially outward from the groove bottom portion of the ring groove and is capable of making line contact with the radially inner end portion of the seal ring. .   The valve assembly according to any one of claims 1 to 3, wherein the housing has a seat surface having a partially back spherical surface that is disposed in the flow path and is in sliding contact with the seal ring when the valve body rotates.   5. The valve assembly according to claim 1, wherein a radial cross section of the protruding portion has a triangular shape that is pointed toward the top.

Images