Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
  • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
  • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
  • F16K1/222—Shaping of the valve member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
  • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
  • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
  • F16K1/226—Shaping or arrangements of the sealing
  • F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
  • F16K1/2265—Shaping or arrangements of the sealing the sealing being arranged on the valve seat with a channel- or U-shaped seal covering a central body portion

Definitions

• the present invention is applied to piping lines for chemical factories, water and sewage systems, agriculture, and fisheries.
• the present invention relates to a suitably used butterfly valve, and more specifically, when the valve body is bent due to fluid pressure when the butterfly valve is fully closed, the valve shaft hole and the stem This prevents the inside of the valve body from leaking into the gap of the valve body, prevents the fluid from leaking from the shaft seal between the through hole of the seating and the stem, and operates the stem.
• the torque does not increase, and even if the valve is continuously opened and closed for a long period of time, fluid may leak from the downstream side of the valve, from the vicinity of the through-hole of the seat and the seal or shaft seal. There are no butterfly valves.
• a hollow cylindrical valve body 51 and an annular shape fitted on the inner peripheral surface of the valve body 51 The seat 5 2, the stem 5 3 that passes through the seat 5 2 and is supported by the valve body 5 1, and the stem 5 3 that passes through the valve shaft hole 5 4 are supported by the stem 5 3.
• the resin butterfly valve becomes larger in diameter, the stress is concentrated mainly in the middle part of the valve body 55 in the stem axis direction due to the fluid pressure applied when the valve is fully closed, and the deflection around the middle part is caused. (See Figure 9).
• the corrosive fluid corrodes the metal stem 5 3, and the strength and durability of the valve may deteriorate. There was a problem that it might be damaged. If the shaft seal 5 6 between the seating 52 and the stem 53 is not sufficiently sealed, it should be opened and closed continuously under high fluid pressure and long-term use. As a result, fluid leaks from the shaft seal part 56, and the fluid enters the back of the seat 57, that is, between the outer periphery of the seat 52 and the inner periphery of the valve body 51. There was a problem that the seating ring 52 may swell in the inner diameter direction, which may increase the operating torque or prevent the valve body 55 from closing.
• valve body 5 5 In the case of a metal butterfly valve, although not as noticeable as resin, the valve body 5 5 is deflected due to the fluid pressure applied when the valve is fully closed as the diameter becomes larger. There is a risk of internal leakage from the gap 5 9 between the seating 52 and the shaft seal between the seating 52 and stem 53 as in the case of resin. There was a possibility that the fluid from In the case of metal, when handling corrosive fluid, lining is applied to the valve body 5 5, but normally no lining is applied to the part where the fluid leaks, so the corrosive fluid is made of metal. Corrosion of the stem has a problem that the strength and durability of the valve may be deteriorated or damaged.
• the shaft seal device of the seat is disclosed in Japanese Patent No. 3 8 9 5 4 2 (pages 1 to 3, Fig. 3). ).
• a seating 6 2 made of an elastic material is fixed on the entire inner peripheral surface of the valve body 61 having a hollow cylindrical fluid passage, and the seating 6 2
• the valve rod 6 of the seat 6 2 is parallel to the 4 axis.
• the seat ring 6 2 that extends from the inner peripheral surface of the seat ring 6 2 without inserting a rigid body such as a ring in the inner diameter direction of the valve body 6 1, and the valve stem 6 It is characterized in that a seat ring 6 2 extending inwardly from the inner peripheral surface of the valve stem 64 and an integral bulging portion 6 6 are formed perpendicular to the four axes. The effect was that leakage of fluid in the axial direction of the valve stem 64 could be reliably prevented by making the compression ratio of the bulging portions 65 and 66 larger than the other portions.
• valve stem 6 4 and the seating 6 2 are sufficiently sealed by the bulging portions 65 and 66, so that the valve stem 6 4 and the seating 6 are sealed. Fluid leakage in the axial direction of the valve stem between 2 is prevented.
• the valve body 63 is deflected due to the fluid pressure applied when the valve is fully closed, sealing with the bulging portion 65 as shown in Fig. 11 is not sufficient, that is, the seat 6 2 and the valve body There is a possibility that a gap will be generated between 6 3 and the inside of the valve body, where fluid leaks from the gap into the attachment part of the valve stem 6 4 and the valve body 6 3.
• the present invention has been made in view of the problems of the prior art as described above.
• the purpose is to prevent internal leakage of the valve body when the valve body is deflected by fluid pressure when the butterfly valve is fully closed, and the shaft between the through-hole of the ring and the stem To provide a butterfly valve that prevents fluid from leaking from a sealing portion and that does not increase the operating torque of the stem and that does not leak even when continuously opened and closed over a long period of use.
• the present invention supports a seat body, which is fitted to the inner peripheral surface of a hollow cylindrical valve body, through the through-hole of the seating, and is supported by the valve body.
• a butterfly valve that opens and closes by rotating the valve body as the stem rotates, and a disc-shaped valve body that is supported by attaching the stem to the valve shaft hole.
• An annular projection having a tapered surface inclined with respect to the valve axis direction is provided in a state protruding in the inner diameter direction at the peripheral edge portion of the through hole in the inner periphery of the seat, and is engaged with the tapered surface.
• a butterfly valve characterized in that a mortar-shaped annular recess is provided on the inner periphery of the opening end of the valve shaft hole of the valve body.
• a boss portion that is always in pressure contact with the valve body is formed, and the contact surface of the boss portion is provided in a concave spherical shape. It is preferred that
• a ring made of a rigid material is provided around the through hole on the outer periphery of the seat.
• annular protrusion is provided on the inner periphery of the through hole of the seating.
• valve body and the valve body are preferably made of synthetic resin.
• the valve body can be rotated by any one of manual, pneumatic, and electric driving.
• FIG. 1 is a longitudinal sectional view showing a fully closed butterfly valve according to a first embodiment of the present invention.
• Fig. 2 is a longitudinal sectional view showing a state in which the fluid pressure is applied to the upstream side of Fig. 1 and the valve body is bent.
• Fig. 3 is an enlarged vertical sectional view of the main part of Fig. 2,
• FIG. 4 is an enlarged longitudinal sectional view showing a main part of the seat and the valve body according to the present invention.
• FIG. 5 is a partially cutaway perspective view showing the seating of the butterfly valve according to the present invention.
• FIG. 6 is a partially cutaway perspective view showing a valve body of a butterfly valve according to the present invention.
• FIG. 7 is a longitudinal sectional view of a butterfly valve with a pneumatic drive that is a second embodiment of the present invention
• FIG. 8 is a longitudinal sectional view of a conventional butterfly valve
• FIG. 9 is a longitudinal sectional view showing a state in which the fluid pressure is applied to the upstream side of FIG.
• FIG. 10 is an enlarged vertical sectional view of the main part of FIG.
• Fig. 11 is an explanatory diagram of the bulge shape and sheet surface pressure of a conventional butterfly valve. Detailed description
• FIGS. 1 and 3 A seat ring 1 fitted to the inner peripheral surface of a hollow cylindrical valve body 3 and a through hole of the seat ring 1 are described.
• 9 and 10 have a stem 4 supported by the valve body 3 and a disc-like valve body 2 supported by attaching the stem 4 to the valve shaft hole 16 and rotating the stem 4
• the butterfly valve which opens and closes by rotating the valve body 2 with the movement, has an annular projection 1 3 with a tapered surface 12 whose outer periphery is inclined with respect to the valve axis direction.
• Peripheral through-holes 9 and 10 are provided in a state protruding in the inner diameter direction at the peripheral edge portion, and a mortar-like annular recess 17 that engages the taper surface 12 is formed in the valve shaft hole 16 of the valve body 2.
• the first feature is that it is provided on the inner periphery of the open end.
• a boss portion 14 that is in constant pressure contact with the valve body 2 is formed on the outer periphery of the annular projection portion 13 of the seating 1, and the contact surface of the boss portion 14 is provided in a concave spherical shape. Is the second feature.
• a third feature is that a ring 15 made of a rigid material is provided around the through holes 9 and 10 on the outer periphery of the seat ring 1.
• a fourth feature is that an annular protrusion 11 is provided on the inner periphery of the through holes 9 and 10 of the seating 1.
• the fifth feature is that the valve body 3 and the valve body 2 are made of synthetic resin.
• valve body is rotated by any one of manual operation, pneumatic operation, and electric drive.
• the shape of the annular protrusion 13 of the seating 1 is not particularly limited as long as the outer periphery has a tapered surface 12 inclined with respect to the valve axis direction.
• a conical shape may be a truncated cone shape, but a truncated cone shape is preferable in order to facilitate assembly without increasing the opening / closing torque of the butterfly valve.
• the taper surfaces 12 and 18 of the seating 1 and the valve body 2 may be provided so as to have a gentle spherical surface.
• the tapered surface 12 of the annular projection 13 of the seat 1 is preferably in the range of 20 ° to 40 ° with respect to the surface perpendicular to the axis of the stem 4. More preferably, it is in the range of ° to 35 °.
• the taper surface 18 of the annular recess 17 of the valve body 2 is preferably in the range of 25 ° to 45 ° with respect to the surface perpendicular to the axis of the stem 4. More preferably, it is in the range of ° to 40 °. This is because when the sealability between the seating 1 and the valve body 2 is taken into account, the greater the taper angle, the better the sealability.
• the surface 12 is preferably larger than 20 ° and the tapered surface 18 is preferably larger than 25 °.
• the taper surface 12 should be less than 40 ° and the taper surface 18 should be less than 45 ° so that the taper angle will not be too large to make alignment difficult when assembling. It is preferable to do.
• the taper angle of the taper surface 18 of the valve body 2 is about 5 ° larger than the taper angle of the taper surface 12 of the seating 1.
• the taper surface 1 8 of the valve body 2 is provided about 5 ° larger than the taper surface 1 2 of the seating 1, This is because the protrusion 13 is not pressed against the annular recess 17 more than necessary, and the sealing performance can be maintained in the long-term use of the annular protrusion 13.
• the valve body 2 and the seating 1 can be aligned, and the valve can be easily assembled.
• the annular protrusion 1 3 by fitting the annular protrusion 1 3 into the annular recess 17, the seat 1 will not be strongly crushed between the valve body 2 and the valve body 3, so torque There is no increase in sealability, and there is no deterioration in sealing performance in long-term use due to the squeezing of the strongly crushed part.
• the boss 1 that is always in pressure contact with the opening end surface of the valve shaft hole 16 of the valve body 2 regardless of whether the valve is opened or closed, is located on the thrust surface near the outer periphery of the annular projection 13 of the seat 1. 4 may be provided.
• the contact surface of the boss 14 that contacts the opening end surface of the valve shaft hole 16 of the valve body 2 is formed in a concave spherical shape complementary to the opening end surface of the valve shaft hole 16 so that the valve body 2
• the valve seat sealability can be improved without smoothing the rotation and increasing the torque.
• a ring 15 made of a rigid material may be provided around the through holes 9 and 10 on the outer periphery of the seat ring 1. This is because when the valve body 2 is deflected due to fluid pressure, the through holes 9 and 10 of the seating ring 1 are eccentric due to the stress that deforms the seating ring 1. Therefore, it is necessary to prevent deterioration of the sealing performance of the shaft seal 21 and fluid leakage under high pressure, and to maintain the long-term sealing performance between the through holes 9 and 10 of the seating 1 and the stem 4. This is preferable.
• the material of the ring 15 is a rigid material that can maintain the sealing performance, it can be made of metal such as ⁇ iron, ⁇ steel, carbon steel, stainless steel, titanium, or vinyl chloride resin (hereinafter, PVC).
• PVC vinyl chloride resin
• PP polypropylene
• PVD F Polyvinylidene fluoride
• PE Polyethylene
• PPS Ho Uf X Dirensulfur H
• PDC Polydicycle ⁇
• An annular protrusion 11 may be provided on the inner periphery of the through holes 9 and 10 of the single 1.
• the ring-like protrusion 11 can improve the sealing property when used in combination with the lino 15.
• valve body 3 and the valve body 2 of the present invention As the material of the valve body 3 and the valve body 2 of the present invention, PVC or PP can be used. However, if the strength and characteristics required for a butterfly valve are satisfied, P VDF, PE, PPS, PDCPD, Synthetic resins such as FRP, or metals such as stainless steel, copper, pig iron, and pig steel may be used. Of these, the valve body 3 and the valve body 2 are preferably made of synthetic resin. The present invention is particularly suitable for large diameters, so if it is made of resin, it will be much lighter and more efficient than metal, and it can be used without problems for corrosive fluid applications. Because «.
• the material of the stem 4 of the present invention is not particularly limited as long as there is no problem in strength such as pig iron, pig steel, carbon steel, stainless steel, and titanium. Also
• the material of the first ring 1 of the present invention is preferably an elastic material, such as EPDM, NBR, rubber such as fluoro rubber, synthetic resin such as PVDF, etc.
• EPDM electroactive polymer
• NBR non-semiconductor-semiconductor
• fluoro rubber e.g., polymethyl methacrylate
• synthetic resin e.g. PVDF
• the butterfly valve of the present invention is mainly driven manually by attaching an octal to one end of the stem 4 protruding from the valve body 3 or by attaching an octal through a gear box. However, it may be driven by pneumatic type (see Fig. 7) by air pressure or by electric type (not shown) by a motor, etc.
• reference numeral 1 is an EPDM sheet, and a hollow cylindrical main body 5 and flange surfaces 6 on both side surfaces thereof are integrally formed.
• An annular ridge 7 having a rectangular cross section is provided at the center of the outer periphery of the main body 5 and is fitted into a fitting groove provided on the inner peripheral surface of the valve body 3 to be described later. Not to do.
• the outer periphery of the flange surface 6 is formed in a circular shape, and the ears 8 provided inwardly projecting from the upper end of the flange surface 6 are fitted into fitting grooves provided on both end surfaces of the valve body 3 to be described later. As a result, seating 1 is prevented from moving.
• through holes 9 and 10 through which the stem 4 passes are formed above and below the stem 4 in the axial direction of the main body 5 of the seat 1.
• annular protrusion 9 and 10 are provided with through-holes 9 and 10 having a semicircular annular protrusion 11 protruding in the inner diameter direction.
• the inner periphery of the sealing ring 1 is a flat and circular shape.
• An annular protrusion 13 having a tapered surface 12 whose outer periphery is inclined with respect to the valve axis direction is provided in a state protruding in the inner diameter direction at the peripheral edge of the through holes 9 and 10. Yes.
• the shape of 13 is a frustoconical shape, and the tapered surface 1 2 is provided so as to be 30 ° with respect to a surface perpendicular to the axis of the stem 4.
• a boss portion 14 that is always in pressure contact with the valve body 2 is provided.
• the boss portion 14 is provided with a concave spherical shape whose contact surface matches the shape of the valve body 2 so as to enhance the valve seat sealing performance.
• the ring 15 made of SCS 13 is fitted.
• a circular PP valve element 2 is arranged in the center of the valve body 3 to be described later.
• a valve shaft hole 16 passing through the valve body 2 is provided in the center of the valve body 2, and a stem 4 described later is passed through the valve shaft hole 16 6 so as not to rotate, and is supported by the stem 4.
• a mortar-shaped annular recess 17 is provided on the inner periphery of the opening end of the valve shaft hole 16 of the valve body 2.
• the tapered surface 1 8 of the annular recess 17 is provided at 35 ° with respect to the surface perpendicular to the axis of the stem 4, and the taper surface 1 8 and the outer peripheral edge 1 9 of the valve body 2 are
• the edge 2 3 which is the boundary is provided with R, that is, an appropriate roundness.
• the annular recess 1 7 of the valve body 2 and the annular projection 1 3 of the seating 1 are assembled so that the annular projection 1 3 fits into the annular recess 1 7.
• the valve 4 opens and closes by rotating in the valve body 3 as the stem 4 rotates, and the outer peripheral edge 19 of the valve body 2 is pressed against and separated from the inner periphery of the seating 1.
• Reference numeral 3 is a hollow cylindrical PP valve body, and a substantially disk-shaped top flange 20 protruding outward is provided at the top.
• a seat ring 1 is fitted on the inner peripheral surface of the valve body 3.
• a fitting groove is provided at the center of the inner peripheral surface of the valve body 3 so that an annular ridge 7 provided at the center of the outer periphery of the seat 1 is fitted.
• a fitting groove into which the ear 8 of the seating 1 is fitted is provided around the opening on both end faces of the valve body 3.
• Reference numeral 4 is a stem made of SUS4003 and is supported by the valve body 3.
• the upper end of the stem 4 is disposed so as to protrude from the center of a top flange 20 provided at the upper part of the valve body 3.
• the central portion of the stem 4 is tightly penetrated through the valve body 3 and the seating 1 in a rotatable state.
• reference numeral 26 denotes a pneumatic drive unit by air pressure, which is attached to the top flange 2 7 of the Nova fly valve via a mounting base 2 8.
• the drive of the pneumatic drive unit 26 is transmitted to the upper part of the stem 29, and the valve 28 is opened and closed by turning the stem 28 and turning the valve body 30.
• an electric drive unit including a motor drive may be provided. In that case, the electric drive unit is mounted on the butterfly valve via the mounting base.
• the butterfly valve of the first embodiment is fully closed, and the operation of the butterfly valve when fluid pressure is applied to the upstream side will be explained.
• the body 2 also rotates, the outer peripheral edge 19 of the valve body 2 is pressed against the inner periphery of the seating 1 and the valve is fully closed (the state shown in FIG. 1), and the inner part of the seating 1
• the valve seat is sealed by the circumference and the outer peripheral edge 19 of the valve body 2.
• the vicinity of the valve shaft hole 16 of the outer peripheral edge 19 of the valve body 2 is always pressed against the boss portion 14 to be sealed, and the annular protrusion portion 13 of the seating 1 is further provided. And the annular recess 17 of the valve body 2 are sealed.
• a double seal between the contact surface of the boss portion 14 and the tapered surface 1 2 of the annular projection portion 1 3 allows the valve shaft hole 16 and the stem 4 of the valve body 2 to be connected to each other. It is possible to prevent fluid from leaking into the gap 25 (hereinafter referred to as “valve internal leakage”).
• the shaft seal 21 between the seating 1 and the stem 4 is provided with a ring 15 so that the valve body 2 is deflected when fluid pressure is applied, and the seat seal 1 Even if a stress that deforms the ring 1 is applied, the through-holes 9 and 10 of the seating 1 do not become eccentric, so that the sealing performance of the shaft seal part 21 does not deteriorate.
• the seal with the stem 4 is improved by the annular protrusion 1 1 Therefore, reliable sealing is performed. Therefore, it is possible to prevent fluid from leaking from the shaft seal portion 21 to the seat back 22, that is, between the outer periphery of the seat 1 and the inner periphery of the valve body 3.
• the edge 2 3 of the valve body 2 bites into the tapered surface 1 2 of the annular projection 1 3 of the seat 1 and the taper surface 1 8 of the valve body 2 Since the taper surface 12 of the seating 1 is pressed to form a seal, the internal leakage of the valve body is prevented. Therefore, the corrosion of the stem by the fluid is also prevented.
• the outer peripheral edge 19 of the valve body 2 bites into the boss 14 due to the deflection of the valve body 2, and a double seal is formed by the taper surfaces 1 2 and 1 8. Even if deflection occurs in body 2, fluid does not leak downstream. In addition, the shaft seal 2 1 has little effect on the sealing performance even if it is bent.
• the water pressure of 0.8 3 MPa is set to 1.1 times the maximum allowable pressure on the upstream side for 1 minute.
• the presence or absence of leakage to the downstream side, internal leakage of the valve body, and leakage of the shaft seal 21 was confirmed visually.
• the shaft seal 2 1 leaks due to water entering the back of the seat 2 2 side. The presence or absence was confirmed.
• the first embodiment of the present invention that is, the annular projection 13 having a tapered surface 12 whose outer periphery is inclined with respect to the valve axis direction on the seat 1, and the valve body 2 is provided with a mortar-shaped annular recess 17, and the ring 1 is provided around the through-holes 9 and 10 on the outer periphery of the seat 1, and the annular protrusion 11 is provided on the inner periphery of the through-holes 9 and 10.
• the valve seat leakage test and durability test were conducted using a butterfly valve with a boss 14 with a concave spherical contact surface that is always in pressure contact with the valve element 2 on the outer periphery of the annular projection 1 3 became. Table 1 shows the test results. In Table 1, “Good” indicates that no leakage occurred, and “Bad” indicates that internal leakage of the valve body occurred.
• Example 1 a valve seat leakage test and a durability test were performed using a butterfly valve that was flat, that is, in a flat state without providing the annular recess 17 in the valve body 2.
• the test results are shown in Table 1 together with the examples. Comparative Example 2
• Example 1 an annular protrusion having a semicircular cross section was provided on the seating 1 instead of the annular protrusion 13, and the valve body 2 was made flat without providing the annular recess 17.
• a valve seat leakage test and a durability test were performed using a butterfly valve. The test results are shown in Table 1 together with Examples and Comparative Example 1.
• Example 1 a butterfly valve that is flat without providing the annular protrusion 13 on the seating 1 and is flat without providing the annular recess 17 on the valve body 2 is used.
• a valve seat leakage test and a durability test were conducted. The test results are shown in Table 1 together with Examples, Comparative Examples 1 and 2.
• Valve seat sealability test and durability test
• Example 1 there was no fluid leakage even after repeated opening and closing 100,000 times.
• Comparative Example 1 to Comparative Example 3 are valves. An internal leak occurred. From this result, the following can be confirmed.
• an annular protrusion 1 3 on the seat 1 as in Example 1 and an annular recess 1 7 on the valve body 2 an annular shape is provided only on the seat 1 as in Comparative Example 1 or 2.
• the valve body 2 is subjected to higher fluid pressure.
• valve body 2 and the seating ring 1 can be sealed without any problem, and even if the valve is fully opened and closed repeatedly for long-term use, the seal 1 does not sag for a long time. Sex can be maintained. For this reason, in the first embodiment, the valve body does not leak and the stem 4 is not corroded by the fluid.
• the annular protrusion 1 3 of Comparative Example 1 in which the annular recess 17 was not provided was always strongly crushed between the valve body 3 and the valve body 2. Although there is no problem with water resistance for a short period of time, in the long-term use, the part to be crushed of the annular projections 1 3 is depressed by repeated full open and closed, so the crushed part is sealed. It can be seen that leakage occurs from the shaft sealing part 21.
• the sealing performance of the shaft sealing part 21 is as follows. There was no fluid leakage due to the annular projections 1 1 provided on the inner periphery of the through holes 9 and 10.
• the valve body 2 and the seating 1 are confirmed by the configuration of the present invention. Since the seal is actually performed, fluid does not flow to the shaft seal 2 1.
• the butterfly valve according to the present invention has the above-described structure, whereby the following excellent effects can be obtained.
• a boss part that is always in pressure contact with the valve body is formed on the outer periphery of the annular projection of the seating, and the contact surface of the boss part is provided in a concave spherical shape, so that the valve body rotates smoothly.
• the seat sealability can be improved without increasing the torque.
• valve body and valve body are made of synthetic resin
• the large-diameter butterfly valve is lightweight and improves workability, and can be used without corrosive problems even in corrosive fluid applications.

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• 2005
  • 2005-03-31 JP JP2005104547A patent/JP4703235B2/ja not_active Expired - Fee Related
• 2006
  • 2006-03-28 WO PCT/JP2006/307005 patent/WO2006107005A1/ja not_active Ceased
  • 2006-03-28 US US11/887,655 patent/US7775505B2/en not_active Expired - Fee Related
  • 2006-03-30 TW TW095111191A patent/TWI376471B/zh not_active IP Right Cessation

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