JP3021891B2 - Butterfly valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve, and more particularly, to a butterfly valve having sanitary properties free of contamination in the fields of food, semiconductor, pharmaceutical and biotechnology. The present invention relates to a butterfly valve having sterility.

[0002]

2. Description of the Related Art The main types of conventional so-called sanitary valves include valves such as a globe valve, a diaphragm valve, a ball valve, and a butterfly valve.
Or other cooks. Of these, generally, globe valves and diaphragm valves are often used in the main line. However, these valves are not only very expensive,
It has drawbacks such as operability in use, which is not always simple.

On the other hand, the ball valve has a structure in which the port is equivalent to the diameter of the pipe when fully opened, and has a structure in which no valve element remains in the pipe. Has many advantages.
However, this type of valve has a gap (cavity) between the ball (valve element) and the body (body) during opening and closing operations.
Is formed, the fluid remains in this gap, and germs are easily generated, which may cause contamination. In order to prevent this, a drain mechanism is often provided at the bottom of the body. However, since it is necessary to open and close the drain valve for each batch, the structure is not suitable for an automation line, and It is also efficient.

Therefore, recently, there has been a tendency that butterfly valves are often used as sanitary valves. In particular, this type of valve generally has a split type structure in which a body is divided at a center portion of a valve shaft. Specifically, a valve body (disc) having a valve stem at a center portion of a combined body is generally used. Provided,
Further a ring-shaped rubber sheet formed by resilient rubber such as silicone rubber is mounted on the inner peripheral surface of the body, the flow passage of the valve by contacting the outer periphery of the valve body on the inner peripheral surface of the rubber sheet It is a structure that opens and closes. Therefore, this conventional butterfly valve has a simple structure as compared with the other valves described above, and is small, lightweight, has good operability, and is inexpensive. Therefore, the butterfly valve is used as a sanitary valve. Tend to.

[0005]

However, since this type of conventional butterfly valve is of a split type in which the body is split at the center of the valve shaft, the processing accuracy on the split surface of the valve stem of the body depends on the machining accuracy. In addition to this, as a valve having sanitary properties, there is a great problem in controlling the sealing properties and processing accuracy in this part. Also,
Rubber, which is the material of the rubber sheet, has problems in tear strength, tensile strength, and abrasion resistance from the viewpoint of mechanical properties, and therefore, the structure where the valve body is in constant contact with the rubber like a butterfly valve It has been confirmed that the rubber surface of the valve having the characteristic (1) causes a peeling phenomenon on the rubber surface due to the sliding force of the valve body, and it is not preferable to use a rubber sheet for the sanitary valve. As a material for this sheet, there is also an example in which a sheet is formed of tetrafluoroethylene resin while avoiding the above rubber, but even in this case, the resin sheet is likely to deteriorate, age, or permanently deform due to heat. Therefore, it has been confirmed that such a valve is not suitable for a seat portion of a butterfly valve that exhibits sanitary properties.

[0006] The present invention has been developed diligently to solve the problems of the conventional butterfly valve as described above, and it is a matter of course that the valve is a sterile valve exhibiting a sanitary function. That, especially, excellent sealing properties,
It is an object of the present invention to provide a new and useful butterfly valve which is easy to disassemble and assemble, and is easy to clean inside and outside of the valve.

[0007]

To achieve the above object, according to an aspect of the present invention, ring-shaped pack up the sheet of synthetic resin sheet liner on the contact surface formed of an elastic material such as rubber
To form a seat ring, a disc having a boss at the top and bottom is rotatably slid on the inner peripheral surface of the seat ring, and a stem is integrally provided in the diameter direction of the boss of the disc. , In the step provided in the flow path of the body body,
Insert the seat ring attached to the disc and seat ring
Side of the disc against the step, and the disc stem
ー Insert the body into the shaft mounting part, and
Hold the other side of the seat ring with the insertion end of the cap
A butterfly valve having a structure in which the pressure was maintained .

[0008] In this case, as toward and away from means a volume data body and the cap, or arranged to be separable and a flange of the main body of the flange and the cap via the ferrule clamp, or bolted or union nut both It can also be provided so as to be able to come and go by means of fastening or screwing.

[0009] Preferably the outer peripheral surface of the boss portion formed in the upper and lower disuccinimidyl is formed in <br/> spherical and sheet ring described above, the tubular stem holding position of the sheet liner formed in a U shape The backup portion is formed around the outer periphery of the sheet liner and the outer periphery of the cylindrical portion, or the boss portion contact surface of the sheet liner is formed in a spherical shape. By forming a protrusion on the contact surface of the boss or forming a protrusion of an appropriate shape on at least one side of the contact surface between the sheet liner and the backup sheet, high sealing performance and low operating torque can be achieved. It is preferable to secure them.

The lower stem of the disc provided in the body is inserted into the lower cylindrical portion of the seat ring, and the inner portion of the insertion groove formed in the lower stem is formed in a conical surface. The center cylinder of the bottom cap screwed from the outside of the lower part of the body into the bottom cap with a little clearance, and the bottom cap has a communication hole through which the conical surface of the insertion groove communicates with the outside of the bottom cap. It is preferable to adopt a structure that performs the following. In addition, the boss portion provided on the diametrically opposed surface of the disc stem provided in the body body is slidably brought into contact with the boss portion contact surface of the seat ring, and the communication is performed to communicate this contact surface with the outside of the body body. An example in which the holes are formed in the lower part of the seat ring and the body main body may be adopted.

Further, it is possible to control the flow rate by forming a curved surface portion of an appropriate shape on the surface of the disc, or to mount an actuator via a bolt on a flange formed at the upper end of the shaft mounting portion of the body. Alternatively, a bracket may be provided on a flange portion at the upper end of the shaft mounting portion of the body body, and an actuator may be mounted via the bracket to exert a heat radiation effect.

[0012]

Since the butterfly valve according to the present invention is constructed as described above, a disc with a seat ring mounted around the outer periphery is inserted from one side of the body body, and a stem integrated with the disc is inserted into the shaft mounting portion. When the seat ring is positioned on the step of the body, a cap is inserted from the other side, and the two are connected by ferrule clamping or bolting, or union nut tightening or screwing means. Since both sides are pressed and held by the step and the tip end face of the cap, the sealing performance of the seat ring is maintained and deformation due to fluid pressure is prevented.

[0013] Next, when retightening is performed with the upper gland and the bottom cap with a preset interference, the backup sheet is compressed and the volume is expanded, so that the sheet liner can have elasticity. In addition, since a communication hole is provided to allow the conical surface of the charging groove formed in the lower stem to communicate with the outside of the bottom cap, if the internal seat part is damaged in some way and the internal fluid leaks, the seat may be used. Since it leaks from the communication hole through the portion, the fact that the leak has occurred from the outside can be visually recognized, so that maintenance can be performed reliably and it is extremely safe. Moreover, when threading the bottom cap, the upper end of the central cylindrical portion of the bottom cap the conical surface of the inner part of the instrumentation insertion groove abuts, disuccinimidyl and stem generated by the flow body pressure inside play a centering action Deformation and misalignment can be prevented.

Further, since the body body is of a type separated from the cap, it has good sealing properties and processing accuracy, and is compact in appearance. Furthermore, since the handle and actuator for manual operation can be easily and alternately attached to the flange of the body main body in a piped state, it is effective for application of an automated line. A certain actuator can be mounted. The components of the butterfly valve described above include:
Since it is a material from which foreign matter does not precipitate, it has excellent sanitary properties.

[0015]

1 to 26 show embodiments of a butterfly valve having sterility according to the present invention. In FIG. 1, reference numeral 1 denotes a body body made of stainless steel, and a seat ring 4, which will be described later, is mounted on a step portion 3 formed on one side of a flow path 2 of the body body 1. Cap 5 fitted from the opening side
Since the seat ring 4 can be sandwiched between the stepped portion 3 and the insertion end face 5b of the cap 5, the sealing performance can be maintained, and the disassembly and assembly can be easily performed. Can be. The body 1
Since it is not a split type at the position of the valve shaft as in the related art, the sealability and processing accuracy at this portion are good, and the appearance can be made compact.

Further, in FIG. 4及beauty Figure 5, it is possible to mount the actuator 7 via bolts 1d to the flange portion 1c formed on the upper end of JikuSo portion 1b of the main body 1. Also, as shown in FIG.
b, a bracket 8 having a U-shaped cross section is provided on the flange portion 1c at the upper end thereof.
Is mounted to dissipate the heat of the fluid and the like to prevent the dew condensation phenomenon and high heat conduction. As described above, when switching from the manual type in which the handle stopper 9 and the manual handle 10 are provided in FIG. 1 to the automatic type as described above, the switching can be performed with the pipe attached to the pipe. It is valid.

As means for moving the body 1 and the cap 5 to and away from each other, as shown in FIG. 1, a flange 1a of the body 1 and a flange 5a of the cap 5 are provided so as to be able to come and go via a ferrule clamp 11. Or, as shown in FIG. 10, they are connected by bolts 6, or as shown in FIG. 11, the union nut 1 is connected via a gasket 12a.
As shown in FIG. 12, the two parts are provided so as to be able to come and go with the screwing means 13, and can be disassembled and assembled with a versatile tool.

The seat ring 4 is a ring-shaped backup sheet 1 made of an elastic material such as rubber disposed on the outer peripheral surface.
4 and a sheet liner 15 made of synthetic resin provided on the inner peripheral surface of the backup sheet 14. A disc 17 having a boss 16 at the top and bottom is rotatably slid on the inner peripheral surface of the seat ring 4. The stem 18 is integrally formed in the diametrical direction of the boss portion 16 of the disk 17, and the stem 18 is inserted into the shaft mounting portion 1 b of the body 1. The outer peripheral surface of the boss portion 16 formed above and below the disc 17 is formed in a spherical shape, and the above-mentioned seat ring 4 is provided with a cylindrical portion 15a at a holding position of a stem 18 of a sheet liner 15 formed in a U-shaped cross section. And the sheet liner 1
The backup sheet 14 is externally provided around the outer periphery of the tube 5 and the outer periphery of the cylindrical portion 15a. Further, the boss contact surface 15b of the sheet liner 15 is formed in a spherical shape, and further, a projection 15c is formed on the boss contact surface 15b of the sheet liner 15,
Alternatively, a ridge 15d is formed to maintain the sealing property. As shown in FIG. 13 to FIG.
A projection 19 having an appropriate shape is formed on at least one side of the contact surface between the sheet and the backup sheet 14 so as to ensure high sealing performance and low operating torque.

A disk 17 provided in the body 1 is provided.
The lower stem 20 is inserted into the lower cylindrical portion 4a of the seat ring 4, the inner part of the insertion groove 21 formed in the lower stem 20 is formed in the conical surface 22, and the body main body 1 is inserted into the insertion groove 21. Bottom cap 23 screwed down from outside
Is inserted with a slight clearance, and a communication hole 25 is formed in the bottom cap 23 so that the conical surface 22 of the insertion groove 21 and the outside of the bottom cap 23 communicate with each other. As another example, FIG.
A compact design excluding the lower stem 20
In FIG. 19, a disc 1 provided in the body 1 is provided.
The boss portion contact surface 15b of the seat ring 4 in a boss portion 16 provided diametrically opposed faces of the stem 18 of 7 to slidably contact, makes communication with the outside of the contact surface and the main body 1
Therefore, the communication hole 26 is formed in the seat ring 4 and the communication hole 26 is formed in the body 1.
A communication hole 26 'is formed. Further, as described above, the disc 17 is made to be compact and aseptic by integrating it with a stem.
Has a shape that allows a large flow passage area when fully opened. In particular, as shown in FIGS. 6 to 9, an appropriately shaped curved surface portion 27 can be formed to control the flow rate of the internal fluid,
It is possible to prevent the disc 17 and the seat ring 4 from deteriorating due to the minute opening and to alleviate the high flow velocity. This curved surface portion 27
In FIG. 9, the relationship of α ゜ <β ゜, 2α ゜ ≒ β ゜ was a preferable result.

Next, the operation of the above embodiment will be described. The disc 17 with the seat ring 4 attached to the outer periphery is attached to the body 1
And the disc-integrated stem 18 is inserted into the shaft mounting portion 1b, and the seat ring 4 is attached to the body 1
When the cap 5 is inserted from the other side and the two are connected by the connecting means of the ferrule clamp 11 or the method of the bolt 6, or the fastening method of the union nut 12, or the screwing means 13, Since both sides of the seat ring 4 are clamped and held by the step portion 3 and the tip end surface of the cap 5, the sealing performance of the seat ring 4 is maintained and deformation due to fluid pressure is reliably prevented.

Next, when the upper gland 28 and the bottom cap 23 are further tightened by a preset interference, the backup sheet 14 is compressed and its volume is expanded, so that the sheet liner 15 has elasticity. Can be. In addition, since the communication hole 25 is provided to allow the conical surface 22 of the insertion groove 21 formed in the lower stem 20 to communicate with the outside of the bottom cap 23, even if the internal sheet portion is damaged in any way, the internal Since the fluid is transmitted through the sheet portion and leaks from the communication hole 25, the leak phenomenon can be visually recognized from the outside, maintenance can be surely performed, and it is extremely safe. And bottom cap 2
When the screw 3 is screwed in, the upper end edge of the central cylindrical portion 24 of the bottom cap 23 comes into contact with the conical surface 22 at the back of the insertion groove 21, so that the deformation or misalignment of the disc or stem caused by the internal flow pressure resistance occurs. Can be prevented.

Further, since the body main body 1 is of a separated type from the cap 5, it has good sealing properties and processing accuracy, and moreover,
It is compact in appearance. Further, the manual handle 10 and the actuator 7 can be easily attached to the flange portion 1c of the body main body 1. In this case, if the bracket 8 is used as shown in FIG. it can.

Effect of the Invention] Thus, according to the present invention, it is possible to provide the sterility of the valve to exert a support Nitari properties, particularly, excellent in sealing property, exploded nor easy and equal cleaning is easy There is an effect that a new and useful butterfly valve satisfying the conditions can be provided. In addition,
ー Attached to the disc is a step provided in the flow path of the main body.
Insert the tring and abut one side of the seat ring against the step
And insert the disc stem into the shaft mounting part of the body.
Then, insert the cap provided on the opening side of the body.
The other side of the seat ring was pinched and held at the end face.
Performance and torque stability are improved.
Also, the assembly and disassembly properties are extremely good.
With no risk of stagnation and sterile sanitary valves
It is suitable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view in which a center position in FIG. 1 is cut.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a state where an actuator is mounted in FIG.

FIG. 5 is a longitudinal sectional view in which an actuator is mounted via a bracket in FIG. 4;

FIG. 6 is a side view of a disc according to the present invention.

FIG. 7 is a front view of a disc according to the present invention.

FIG. 8 is a front view of a disc according to the present invention.

FIG. 9 is an enlarged sectional view taken along the line AA of FIG. 8;

FIG. 10 is a longitudinal sectional view of a state in which the body body and the cap are bolted together.

FIG. 11 is a longitudinal sectional view of the union nut connected to the body body and the cap.

FIG. 12 is an enlarged vertical sectional view of a state where a body main body and a cap are screwed together in a part a of FIG. 10;

FIG. 13 is a partially enlarged cross-sectional view showing an example of a joined state between the sheet liner and the backup sheet in a portion b of FIG.

FIG. 14 is a partially enlarged cross-sectional view showing an example of a joined state between a sheet liner and a backup sheet in a portion b of FIG. 10;

FIG. 15 is a partially enlarged cross-sectional view showing an example of a joined state between the sheet liner and the backup sheet in a portion b of FIG.

FIG. 16 is a partially enlarged cross-sectional view showing an example of a joined state between a sheet liner and a backup sheet in a portion b of FIG. 10;

FIG. 17 is a partially enlarged cross-sectional view showing an example of a joined state between the sheet liner and the backup sheet in a portion b of FIG. 10;

FIG. 18 is a partially enlarged cross-sectional view showing an example of a joined state between the sheet liner and the backup sheet in a portion b of FIG.

FIG. 19 is a longitudinal sectional view showing another example of the butterfly valve according to the present invention.

FIG. 20 is a longitudinal sectional view of a sheet liner.

FIG. 21 is a front view of the half cut of FIG. 20;

FIG. 22 is a partially enlarged cross-sectional view of the seat liner.

FIG. 23 is a perspective view of a sheet liner.

FIG. 24 is a side view of the disc.

FIG. 25 is a front view of a backup sheet.

26 is a sectional view taken along line BB of FIG. 25.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body main body 1a Flange 1b Shaft mounting part 1c Flange part 2 Flow path 3 Step part 4 Seat ring 4a Lower cylinder part 5 Cap 5a Flange 6 Bolt 7 Actuator 8 Bracket 9 Handle stopper 10 Manual handle 11 Ferrule clamp 12 Union nut 12a Gasket Reference Signs List 13 Screwing means 14 Backup sheet 15 Seat liner 15a Cylindrical part 15b Boss contact surface 15c Projection 15d Projection ridge 16 Boss 17 Disc 18 Stem 19 Projection 20 Lower stem 21 Insertion groove 22 Conical surface 23 Bottom cap 24 Central cylindrical part 25 Communication hole 26 Communication hole 27 Curved surface 28 Ground

Claims (3)

(57) [Claims] 1. A rubber like annular backup sheet made of a synthetic resin sheet liner on the contact surface formed by the elastic material
To form a seat ring, a disc having a boss at the top and bottom is rotatably slid on the inner peripheral surface of the seat ring, and a stem is integrally provided in the diameter direction of the boss of the disc. , In the step provided in the flow path of the body body,
Insert the seat ring attached to the disc and seat ring
Side of the disc against the step, and the disc stem
ー Insert the body into the shaft mounting part, and
Hold the other side of the seat ring with the insertion end of the cap
A butterfly valve characterized by holding pressure . 2. A lower stay of a disc provided in a body body.
The lower ring, and insert the lower ring into the lower cylinder of the seat ring.
When the inside of the insertion groove formed in the
Bottom screwed into the insertion groove from the outside of the lower part of the body
The middle tube of the cap is inserted with some clearance
And the conical surface of the charging groove communicates with the outside of the bottom cap
The communication hole according to claim 1, wherein the communication hole is formed in the bottom cap.
Butterfly valve. 3. A disk stem provided in a body body.
The boss of the seat ring is attached to the boss provided on the diametrically opposed surface.
The contact surface is slidably contacted, and this contact surface and the body
The communication hole that communicates with the outside of the seat ring and body
The butterfly valve according to claim 1, wherein the butterfly valve is formed at a lower portion of the butterfly valve.