JPS6017573Y2 - butterfly valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a screw valve, particularly for corrosive and potentially harmful liquids, as well as chemical liquids, liquid food ingredients, etc.

More specifically, the present invention is a conventional spiral valve in which a disc-shaped or lens-shaped valve plate is rotated one-quarter of a turn to shut off a conduit for liquid and open the valve. The present invention relates to a spiral valve of the type configured to rest against an annular valve seat having a U-shaped cross section covering the inside and sides of the body.

This annular valve seat must be resilient to ensure a seal, and at the same time must be corrosion resistant to corrosive and potentially harmful liquids, and also: Friction with the valve body is allowed, but the coefficient of friction must be small and there must be no permanent deformation or wear.

Since a single material does not have such contradictory properties,
It has been proposed to make this valve seat from an elastomer, for example rubber, and to cover the outside of the U-shaped cross-section with a polymer, for example Teflon®.

However, these two materials necessarily and to a considerable extent differ, on the one hand, with respect to their modulus of elasticity and, on the other hand, with respect to the extent of their elastic range, and their connection is generally by lamination; poses vexing technical problems that are difficult to solve.

This problem arises particularly with respect to permanent deformation of the polymer and its flow during operation.

In order to solve these problems, US Patent No. 36611
No. 71 (Cosmos Corporation) discloses a spiral valve structure including the following components:

(B) A valve body having an opening defined by an annular inner surface having an internal groove and a pair of side wall surfaces; (B) A valve member mounted on the valve body so as to be driven within the valve body opening; (C) a flexible lining surrounding the valve member and the aperture and having spaced apart ribs on an outer surface between and extending substantially around the inner surface and disposed within the groove; and b) Resilient expansion means disposed within the groove between the ribs of the lining and exerting a localized radial force on the area between the ribs.

In such valve constructions, the valve body has two diametrically opposed openings through which the drive shaft of the valve member extends.

The flexible lining has an integral cylindrical portion axially aligned to substantially communicate with the interior of each of the apertures.

A plurality of members are disposed in surrounding relation to the outer surface of one of the cylindrical portions to close the leakage or passageway of liquid outwardly along the axis.

Similarly, U.S. Pat. No. 3,778,028 (Gall W., Grapes) also discloses a spiral valve, which includes a valve body,
a substantially rigid plastic resin lining mounted in the aperture of the valve body, a disc pivotally mounted in the aperture, and a disc disposed between the disc of the valve disc and a support member of the lining; first and second filler means for forming an effective seal to prevent leakage between the first and second filler means.

A resilient valve seat is disposed between the lining and the valve body to flexibly bias the lining into engagement with the disc.

It is an object of the present invention to improve the structure of the valve plate as described above so that the sealing engagement of the valve member on the lining is enhanced without the flexible lining becoming stuck or permanently deformed. The goal is to improve

Another object of the invention is to obtain both a sealing engagement and a seal along the valve member pivot axis while maintaining continuity in shape, flexibility, resiliency and compressibility around the entire circumference of the valve plate. .

These purposes are distantly related to the spiral valve according to the present invention.

This spiral valve has an internal cylindrical hole, two radially coaxial conduits diametrically opposed to each other with respect to the cylindrical hole, and an annular groove 15 formed on the circumferential surface of the cylindrical hole. bodies 1, 2; spherical portions 5, 6 and two coaxial protrusions rotatably arranged in said conduit to impart a pivoting movement to the valve plate 4 between open and closed positions within the valve body; Axis 7, 9
an annular plastomer lining with a U-shaped cross section constituting a valve seat 11 that receives the coaxial protruding shafts 7 and 9 of the valve plate 4, the lining comprising a spherical surface of the valve plate 4 in each of the conduits; a valve seat lining (hereinafter simply referred to as valve seat) comprising a spherical part 31 which is substantially complementary in shape to the parts 5, 6 and a sleeve part surrounding the associated coaxial projecting shafts 7, 9; an elastic annular support 14 which is independent of the seat 11 and is composed of an elastomeric material which completely fills and is accommodated in said annular groove 15 and has a free surface in contact with the bottom of the U-shaped cross-section of the valve seat 11; More specifically, the annular support 14 is a sleeve portion surrounding each of the coaxial protruding shafts 7, 9 and the corresponding sleeve portion of the valve seat 11 and supporting the corresponding sleeve portion,
The spherical portion 31 of the valve seat 11 is constantly compressed against each spherical portion 5, 6 of the valve plate 4 to form a seal facing outward of the conduit of the coaxially protruding shafts 7, 9, and In the closed position of 4, a sleeve part is provided to ensure the continuity of the seal between the upstream and downstream of the valve plate on the valve seat 11; a first bearing 39 which is a bearing for the coaxial protruding shafts 7 and 9 and is movable in the axial direction and has an inclined end 41 that abuts one of the surfaces of the ring member 42; a washer 43 having a chamfered side 44 in contact with the other surface of the valve; and a spring 40 provided between the first bearing 39 and a second bearing 38 fixed with respect to the valve body, 40 acts on said first bearing 39 and presses it against the ring member 42 , the valve body is provided with a shoulder 45 and presses the washer 43 under the action of a spring 40 transmitted through the ring member 42 . The sleeve portion of the valve seat 11 rests on a shoulder 45 which is at a level with the upper surface of the sleeve portion of the annular support 14 such that the sleeve portion of the valve seat 11 abuts the ring member 42 to form a seal. It is characterized by being configured as follows.

In such a spiral valve, the elastic deformation of the valve seat made of an elastic material is localized to the central region of the valve seat, which is very close to the point where the valve plate is supported in the closed position of the valve. The eugenic deformation ensures sufficient pressure on the valve seat for sealing even if the thickness of the support part is small.

Since the valve plate lightly engages the valve seat, deformation of the valve seat is also slight and remains within the elastic limits of the elastic material of which the valve seat is made.

On the other hand, the support precisely fills the annular groove of the valve seat, so
It is immobilized by the sides and bottom of the U-section of the valve seat on both sides of the support.

According to a preferred embodiment of the invention, the valve seat is thinner in the center of the U-shaped bottom of its cross section in order to provide greater elasticity.

As a non-limiting example, the support elastomer is natural or synthetic rubber and the valve seat elastomer is FETXPF.
A may be polytetrafluoroethylene or other fluoric acid polymers with the required qualities.

According to another advantage of the invention, the seals in the shaft conduit between its upstream and downstream sides and the outward seal in the shaft conduit are compressed against the spherical part of the valve plate by the support. This is ensured by the spherical part of the valve seat.

This assembly advantageously ensures continuity of shape, flexibility, elasticity and compressibility over the entire circumference of the valve plate.

According to another advantage of the invention, the support and the valve seat form a sleeve encircling the shaft, the valve plate having a slightly larger diameter than the sleeve of the valve seat supported by the support, and the valve plate having a slightly larger diameter than the sleeve of the valve seat supported by the support. This large diameter of the plate defines the overall elastic compressibility and seals between the upstream and downstream passages of the shaft.

In this regard, it will be appreciated that the seal on the spherical shape of the valve plate is sufficient to prevent any leakage along the axis under normal operating conditions.

Yet another advantage of the invention is that it has a second method for sealing the valve or shaft portion of the line, as mentioned above, which can be used, for example, with graphite. A ring member or gasket made of polytetrafluoroethylene containing compressed by a spring,
The gasket is supported by a flange portion provided at an upper portion of the sleeve constituted by the valve seat and projects into the washer.

An embodiment of the invention will now be described, by way of non-limiting example, with reference to the accompanying drawings.

In FIGS. 1 and 2, the valve body (hereinafter simply referred to as the valve body) of the spiral valve of this embodiment consists of valve body parts 1 and 2 connected by screws, and has a circular shape in the conduit of the valve body. A plate-shaped valve plate 4 is rotatably arranged, and the valve plate 4 is provided with spherical portions 5 and 6 at the upper and lower ends along the line indicated by XX in FIG.

The cross section of the disc-shaped valve plate 4 is desirably spherical and has the same diameter as the spherical portion.

The valve plate 4 is made of a corrosion-resistant metal material, a painted or enameled metal material, or a metal material coated with an elastomer or polymer, such as Teflon.

The valve plate 4 is mounted on an upper shaft 7 and a lower shaft 9 having a protrusion 8 projecting outward from the valve plate.

(The lower shaft 9 may not be provided for small diameter valves.

) The valve is mounted by flanges B between opposite openings of tube C (FIG. 1).

The flange B is integrally attached to the pipe C by welding as shown in FIG.

Further, the inner periphery of the flange B may be covered with a normal protective material like the pipe C.

As shown in FIGS. 1 and 3, the lining 11 that constitutes the valve seat (hereinafter simply referred to as the valve seat) is made of elastomer and has a ring shape with a U-shaped cross section. The side edge 12 is clamped by the flange B (FIG. 3 shows the state before clamping and the two are separated), thereby firmly holding the valve seat 11 and This seals between the valve body portions 1 and 2.

In this embodiment, in the U-shaped cross section of the valve seat 11, the thickness of the bottom surrounded by the side edges 12 becomes thinner at the center of the bottom, and a thin elastic layer made of elastomer supports the thin bottom from behind. The annular support 14 is attached to the valve body portion 1
, and is fitted into an annular groove 15 formed between the two.

The outer surface of the bottom of the U-shaped cross section of the valve seat 11 is preferably spherical.

As shown in FIG. 4, in the valve closing position, the valve plate 4 is slightly deformed at the bottom central portion 13 of the U-shaped cross section of the valve seat 11, but is supported by the support 14 and receives the reaction. The center portion 13 of the bottom of the U-shaped cross section of the valve seat 11 presses against the outer periphery of the valve plate 4 to seal that portion.

Further, as is clear from FIG. 4, since the side edge 12 of the U-shaped cross section of the valve seat 11 is clamped, the valve seat 11 will not be pulled out by the flow of fluid, and the support 14 will also be firmly attached to the annular groove 15. Since they are fitted, they cannot be pulled out, so there is no possibility that the sealing function will deteriorate due to the valve seat or support coming off.

By way of example only, in a valve having a diameter of 80 mm, the thickness of the Teflon valve seat 11 in the U-shaped cross section is 1 m from the bottom central part 13 to the sides, and 3 mm from the bottom to the sides, and 2 mm at the side parts 12. , the thickness of the rubber support 14 is 51rrI14.

According to FIG. 5, the valve is provided with two types of seals in the conduit section for the shaft 7, namely an operating seal and a safety seal.

The operational seal acting between upstream and downstream and in the outward direction of the valve is the spherical surface of the valve seat 11 compressed by the support 14 against the corresponding spherical portions 5, 6 of the valve plate 4 in the conduit section of the shaft 7. This is ensured by the shaped part 31.

For this purpose, the support 14 and the valve seat 11 form a sleeve surrounding the shaft 7.

The outer surface of the bottom of the U-shaped cross-section of the valve seat 11 has a spherical shape, the diameter of which is equal to the diameter of the spherical part surrounding the conduit part for the shaft 7. This is advantageous because the continuity of the shape of the valve seat can be maintained.

In order to maintain the same elasticity at the portion where the valve seat contacts the valve plate, the thickness of the valve seat at that portion should be the same.

The valve plate 4 has a diameter slightly larger than the sleeve portion of the valve seat 11 supported by the support 14;
The slightly larger diameter establishes an elastic compression in that region and seals the conduit section of the shaft 7 between its upstream and downstream sides.

This sealing method is also sufficient to prevent leakage in the conduit section of the shaft 7 and ensures that the shape, flexibility, elasticity and compressibility around the valve plate 4 remains constant.

The safety seal along the axis 7 is for example a bronze ring 3
2, provided with an inner gasket 34 and an outer gasket 35, secured by a retainer 33 holding the ring 32;

The shaft 7 is held and rotated by two bearings 38 and 39, and a compression spring 40 is interposed between the bearings 38 and 39.

The second bearing 39 exerts a force by its beveled beveled end 41 towards a ring member 42, which has a triangular cross-section and is made of polytetrafluoroethylene containing graphite, for example, and which serves as a gasket.

This ring member 42 is stopped by a washer 43 made of stainless steel, for example with a chamfered side, i.e. a chamfered side 44, which is formed on the valve body in the upper region of the sleeve formed by the support 14. It is held by the shoulder of the hole 45.

The safety seal along the axis 7 is thus essentially compressed by the spring 40 between the bearing 39 and the washer 43 and abuts the upper end surface of the part 46 of the sleeve formed by the valve seat 11. Ring member 42 (i.e. gasket)
Guaranteed by.

For this purpose, the upper end of the upper part 46 of the sleeve part formed by the valve seat has a washer 4 which extends further upwards beyond the upper part of the sleeve formed by the support 14.
It protrudes slightly above 3.

The chamfered side 41 of the second bearing 39 has a triangular cross-sectional shape.
and the ring member 4 compressed between the chamfered side 44 of the washer 43
2 exerts a radial pressing force on the upper part 46 of the sleeve by the valve seat to prevent leakage to the outside if the seal by the spherical part 31 is somehow incomplete or broken.

It must be noted that the compressibility of the ring member 42 is clearly greater than that of the elastomeric support 14, so that the washer 43 always rests on the shoulder of the bore of the valve body.

It should be noted that the support 14 is enclosed within a limited volume and the two types of seals described above are completely independent of each other.

In the embodiment shown in FIGS. 1 and 2, the lower opening of the conduit in part 2 of the valve body is closed with a catch 50. In the embodiment shown in FIGS.

A retainer 51 held by a retainer 52 supports a strong compression spring 53 under a flange 54 of the lower shaft 9, which flange 54 supports a bearing 55 for the end of the shaft 7 of the valve plate 4.

The flange 54 carries, in a manner similar to that previously described, a graphite-loaded Teflon gasket 57 thereon, and a washer 58 which is stopped by a shoulder in the hole of the valve body above it, by means of a ring 56. It comes into close contact with the cross section of the flange provided in the lower part of the sleeve formed by the valve seat 11.

As constructed as described above, the conventional spiral valve according to this invention has various advantages as described following the purpose of the invention at the beginning of the detailed description of the invention. The effect can be advantageously exerted.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views passing through the axis of the valve plate of a spiral valve according to an embodiment of the present invention, with FIG. 1 showing the valve plate in the closed position, and FIG. FIG. 2 shows the valve plate in the open position, and FIGS. 3 and 4 are cross-sectional views of the above embodiment taken perpendicular to the axis of the valve plate and passing through the axis of the pipe, 3 shows the valve plate in the closed position, FIG. 4 shows the valve plate 4 in the open position, and FIG. 5 is an enlarged partial sectional view of the above embodiment, FIG. 4 more clearly illustrates the two types of seals used in the valves shown in FIGS. 1, 2, 3, and 4, namely operational seals and safety seals. Explanations of the symbols in the figure are as follows. 1.2... Valve body part, 3... Screw, 4
... Valve plate, 5, 6 ... Spherical part, 7
... Upper shaft, 8 ... Protrusion of valve body shaft, 9 ... Lower shaft, 11 ... Valve seat, 12
・・・・・・Side edge of U-shaped cross section of valve seat, 13.
・・・・・・Central part of the bottom of the U-shaped cross section of the valve seat, 1
4... Support for supporting the center part of the bottom in the U-shaped cross section of the valve seat, 15... Annular groove, 31.
... Spherical part, 32 ... Ring, 33
...Retainer, 34...Inner gasket, 35...Outer gasket, 38.39...
...Bearing, 40...Compression spring, 41...
... Inclined end of bearing 39, 42 ... Ring member with triangular cross section, 43 ... Washer, 44 ...
・Chamfered side of washer, 45... Hole provided in valve body, 4
6...flange, 50...stopper, 5
1...Receiver, 52...Retainer, 53
... Spring, 54 ... Upper part of sleeve by valve seat, 55 ... Bearing, 56 ...
・Ring, 57...Gasket, 58...
...Washer, X-X... Valve plate axis, Y-Y...
...Pipe axis, B...Flange, C...
...Tube, D...Protective material.

Claims (1)

[Claims for Utility Model Registration] 1. An internal cylindrical hole is formed, two radially coaxial conduits facing diametrically oppositely with respect to the cylindrical hole, and an annular groove formed on the circumferential surface of the cylindrical hole. 15: a spherical portion 5, 6, rotatably arranged in said conduit to impart a pivoting movement to the valve plate 4 in the open and closed positions in the valve body; Two coaxial protruding shafts 7 and 9
a valve plate 4 comprising; an annular plastomer lining with a U-shaped cross section constituting a valve seat 11 for receiving the coaxial protruding shafts 7, 9 of the valve plate 4;
a valve seat comprising a spherical portion 31 substantially complementary in shape to the spherical portion 5, 6 of the valve plate 4 in each of said conduits, and a sleeve portion surrounding said associated coaxial projecting shaft 7, 9; a lining, which is independent of the valve seat 11 and is composed of an elastomeric material that completely fills and is accommodated in the annular groove 15;
A helical valve comprising: a resilient annular support 14 having a free surface in contact with the bottom of the U-shaped cross-section of the valve seat 11; The sleeve portion surrounds and supports the corresponding sleeve portion of the valve seat 4, and the sleeve portion is configured to constantly compress the spherical portion 31 of the valve seat 11 against each of the spherical portions 5, 6 of the valve seat 4, and the coaxial protruding shaft 7, 9, and in the closed position of the valve plate 4, the valve seat 1
The helical valve further includes a ring member 42 of triangular cross-section around each of said coaxially projecting shafts 7, 9. , a first bearing 39 which is a bearing for the coaxial protruding shafts 7 and 9 and is movable in the axial direction and has an inclined end 41 that abuts one of the surfaces of the ring member 42; and a ring member 42.
a washer 43 having a chamfered side 44 in contact with the other surface of the valve; and a spring 40 provided between the first bearing 39 and a second bearing 38 fixed with respect to the valve body, 4
0 acts on said first bearing 39 and presses it against the ring member 42 , the valve body is provided with a shoulder 45 and under the action of a spring 40 transmitted through the ring member 42 the washer 4
3 supported by its shoulder 45, said shoulder 45 having a height perpendicular to the upper surface of said sleeve portion of the annular support 14, and said valve seat 11
4. A spiral valve according to claim 1, wherein said sleeve portion is configured to abut a ring member 42 to form a safety seal. 2 Utility Model Registration Claims 1. The spiral valve according to claim 1, wherein the ring member 42 is made of a material whose compression ratio is greater than that of the annular support 14.