JPH05164252A - Butterfly valve - Google Patents

Abstract

PURPOSE:To provide a germ-free valve having sanitary capability, particularly excellent in sealing quality, and allowing an easy assembly and overhaul work, and an easy washing work for both inside and outside thereof. CONSTITUTION:A seat ring 4 is coupled to a step section 3 formed at one side of the flow passage of a valve body 1, and pressed and held with a cap 5 coupled from the other side of the body 1. Also, the flange of the body 1 and the flange 5a of the cap 5 are so formed as to come in contact with and part from each other via a ferrule clamp 11. A seat ring 4 is constituted of a ring of a backup seat 14 formed with a resilient material such as rubber laid on the external surface of the ring 4, and a synthetic resin seat liner 15 laid on the internal surface of the seat 14. In addition, a disc 17 having upper and lower boss sections is kept in slidable contact with the internal surface of the seat ring 4 for free turning and a stem 18 is formed as integral part of the disc 17 in the radial direction of the boss sections. This stem 18 is inserted in the shaft mounting section of the body 1.

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, this butterfly valve has a sanitary piping line free from contamination in the food field, semiconductor field, pharmaceutical field or biotechnology field. The present invention relates to a butterfly valve which is also provided with a sterilization function.

[0002]

2. Description of the Related Art The main types of conventional so-called sanitary valves are valves such as globe valves, diaphragm valves, ball valves and butterfly valves.
Or other cooks can be mentioned. Among them, generally, a globe valve and a diaphragm valve are often used in the main line. But not only are these valves very expensive,
The operability in use is not always simple.

On the other hand, the ball valve has a structure in which it has a port equivalent to the diameter of the pipe when it is fully opened, and since the valve body does not remain in the pipe, there is no cause of contamination due to securing a flow rate or a step. Has many advantages of.
However, this type of valve has a gap (cavity part) between the ball (valve body) and the body (main body) when opening and closing.
As a result, the fluid remains in this gap and various bacteria are likely to be generated, which may cause contamination. In order to prevent this, a drain mechanism is often provided at the bottom of the body, but this requires work to open and close the drain valve for each batch, so this structure is unsuitable for automated lines and is unsuitable. It is also efficiency.

Therefore, recently, a butterfly valve is often used as a sanitary valve. In particular, this type of valve generally has a split type structure in which the body is divided at the center of the valve shaft. Specifically, a valve body (disk) having a valve rod at the center of the joined body is used. Provided,
In addition, a ring-shaped rubber sheet made of elastic rubber such as silicon rubber is attached to the inner peripheral surface of the body, and the inner peripheral surface of the rubber sheet is brought into contact with the inner peripheral surface of the rubber sheet so that the flow path of the valve It is a structure that opens and closes. Therefore, this conventional butterfly valve uses a butterfly valve as a sanitary valve because it has a simpler structure than other valves described above, and is small, lightweight, easy to operate, and inexpensive. Tend to do.

[0005]

However, since the conventional butterfly valve of this type is a split type in which the body is divided at the central portion of the valve shaft, the accuracy of processing on the split surface of the body of the body depends on the dividing surface. Not only that, but as a valve having a sanitary property, there was a great problem in controlling the sealing property and processing accuracy in this portion. Also,
The rubber, which is the material of the rubber sheet, has problems in tear strength, tensile strength, and wear resistance from the mechanical properties, and therefore the valve body is in constant contact with the rubber like a butterfly valve. It has been confirmed that the rubber sheet of the valve having the above-mentioned causes a peeling phenomenon on the rubber surface due to the sliding force of the valve body, and it is not preferable to use the rubber sheet for the sanitary valve. As a material for this sheet, there is an example in which the above-mentioned rubber is avoided and the sheet is molded with ethylene tetrafluoride resin, but even in this case, the resin sheet is likely to cause deterioration, aging or permanent deformation due to heat influence. Therefore, it has been confirmed that it is not suitable for the seat portion of a butterfly valve that exhibits such sanitary properties.

The present invention has been developed eagerly in order to solve the problems of the above-mentioned conventional butterfly valves, and it goes without saying that it is a sterile valve that exhibits a sanitary function. Especially, it has excellent sealing properties,
It is an object of the present invention to provide a new and useful butterfly valve that is easy to disassemble and assemble, and is easy to clean the inside and outside of the valve.

[0007]

In order to achieve the above-mentioned object, the present invention mounts a seat ring on the inner peripheral surface of the flow passage provided in the body main body at a substantially central position.
A ring-shaped backup sheet formed of an elastic material such as rubber disposed on the outer peripheral surface, and a synthetic resin sheet liner provided on the inner peripheral surface of the backup sheet,
A disc having upper and lower boss surfaces is rotatably slidably contacted with the inner peripheral surface of the seat ring to integrally form a stem in the diametrical direction of the boss surface of the disc. It was a butterfly valve with a structure that was inserted into.

In this case, a seat ring is attached to a step portion formed on one side of the flow path of the body main body, and the seat ring is held by a cap provided from the other side of the body main body so as to facilitate disassembly and assembly. Is preferred. As a means for contacting and separating the body body and the cap, the flange of the body body and the flange of the cap can be provided so as to be contactable and separable via a ferrule clamp, or both of them can be bolted or union nut tightened or screwed. It can also be provided so that it can be contacted and separated.

It is preferable that the outer peripheral surfaces of the boss portions formed on the upper and lower sides of the disc are formed in a spherical shape, and in the seat ring described above, the tubular portion is integrally formed at the stem holding position of the seat liner formed in a U-shaped cross section. The outer periphery of the seat liner and the outer periphery of the tubular portion are covered with a backup sheet, or the boss contact surface of the seat liner is formed into a spherical shape, and the boss contact surface of the seat liner is further formed. It is possible to secure high sealability and low operating torque by forming a protrusion on the surface or forming a protrusion having an appropriate shape on at least one side of the contact surface between the seat liner and the backup sheet. preferable.

Further, the lower stem of the disc provided inside the body is inserted into the lower cylindrical portion of the seat ring, and the inner part of the charging groove formed in the lower stem is formed into a conical surface, and the inside of the charging groove is formed. The central cylindrical part of the bottom cap, which is screwed in from the bottom of the body, is inserted with a slight clearance, and the bottom cap has a communication hole that connects the conical surface of the insertion groove and the outside of the bottom cap. It is preferable to adopt a structure that In addition, the contact surface of the boss of the seat ring is slidably brought into contact with the boss provided on the diametrically opposed surface of the disc stem provided inside the body, and the contact surface communicates with the outside of the body. It is also possible to adopt an example in which the holes are formed in the seat ring and the lower portion of the body.

Further, a curved surface having an appropriate shape may be formed on the surface of the disk to control the flow rate, or an actuator may be mounted on a flange formed on the upper end of the shaft mounting portion of the body body via a bolt. Alternatively, a bracket may be provided on the flange portion at the upper end of the shaft mounting portion of the body body, and the actuator may be mounted via this bracket to exhibit the heat radiation effect.

[0012]

Since the butterfly valve according to the present invention is constructed as described above, the disc with the seat ring mounted on the outer periphery is loaded from one side of the body main body, and the stem integrated with the disc is loaded into the shaft mounting portion. When the seat ring is positioned on the stepped portion of the body, the cap is inserted from the other side, and the both are connected by the ferrule clamp method or bolt tightening, or the union nut tightening or screwing means. Since both sides are held by the stepped portion and the tip surface of the cap, the seat ring is maintained in a sealing property and is prevented from being deformed by fluid pressure.

Then, when the upper gland and the bottom cap are retightened by a preset tightening margin, the backup sheet is compressed and its volume is expanded, so that the seat liner can be given elasticity. In addition, since a communication hole that allows the conical surface of the charging groove formed in the lower stem to communicate with the outside of the bottom cap is provided, if the internal fluid part is damaged and the internal fluid leaks, Since it is transmitted through the portion and leaks from this communication hole, the fact that it has leaked from the outside can be visually recognized, so that reliable maintenance is possible and it is extremely safe. Moreover, when the bottom cap is screwed in, the upper end edge of the central tubular portion of the bottom cap contacts the conical surface at the inner part of the charging groove, so that the centering function is fulfilled and the disc or stem generated due to the internal flow pressure is generated. Deformation and misalignment can be prevented.

Further, since the body body is of a separable type from the cap, it has good sealing properties and processing accuracy, and is compact in appearance. In addition, manual handles and actuators can be simply and alternately attached to the flange of the body while it is still in a piping state, which is effective for application to automation lines. An actuator can be installed. The components of the butterfly valve described above are
Since it is a material that does not deposit foreign matter, it has excellent sanitary properties.

[0015]

1 to 26 show each embodiment of a butterfly valve having sterility in the present invention. In FIG. 1, reference numeral 1 is a body body made of stainless steel, and a seat ring 4 described later is attached to a step portion 3 formed on one side of a flow path 2 of the body body 1, and the seat ring 4 is attached to the body body 1. Cap 5 fitted from the other side
The seat ring 4 is held in place by holding the seat ring 4 in place.
Since the tip surface of the cap 5 can be pressed, the sealability is maintained and the disassembly and assembly can be easily performed. Since the body 1 is not a split type at the valve shaft position as in the conventional case, the sealability and processing accuracy in this portion are good, and the appearance can be made compact.

Further, in FIG. 4, the actuator 7 can be mounted on the flange portion 1c formed at the upper end of the shaft mounting portion 1b of the body body 1 via the bolt 6. Also,
As shown in FIG. 5, a bracket 8 having a U-shaped cross section is provided on the flange portion 1c at the upper end of the shaft mounting portion 1b of the body body 1,
The actuator 7 is mounted via the bracket 8 to radiate heat of fluid or the like to prevent a dew condensation phenomenon or high heat conduction. As described above, even when the manual type having the handle stopper 9 and the manual handle 10 in FIG. 1 is switched to the automatic type as described above, it can be performed in a state where the pipe is attached, which is extremely effective in an automation line. It is valid.

As a means for contacting and separating the body 1 and the cap 5, 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 contactable and separable via a ferrule clamp 11. Alternatively, as shown in FIG. 10, the two are connected by bolts 6, or, as shown in FIG. 11, the union nut 1 is inserted via a gasket 12a.
It is possible to tighten and fix it with No. 2, or as shown in FIG. 12, both are provided so as to be able to be brought into contact with and separated from each other by a screwing means 13, and further, it is possible to disassemble and assemble with a versatile tool.

The seat ring 4 is a ring-shaped backup sheet 1 formed of an elastic material such as rubber disposed on the outer peripheral surface.
4 and a seat liner 15 made of synthetic resin provided on the inner peripheral surface of the backup sheet 14, and a disc 17 having a boss portion 16 on the upper and lower sides is rotatably slidable on the inner peripheral surface of the seat ring 4. The stem 18 is integrally formed in the boss portion 16 of the disc 17 in the diameter direction, and the stem 18 is inserted into the shaft mounting portion 1b of the body body 1. The outer peripheral surfaces of the boss portions 16 formed on the upper and lower sides of the disc 17 are formed in a spherical shape, and the seat ring 4 described above has a tubular portion 15a at the holding position of the stem 18 of the seat liner 15 formed in a U-shaped cross section. The seat liner 1
The backup sheet 14 is placed on the outer periphery of the outer peripheral portion 5 and the outer periphery of the tubular portion 15a. Further, the boss contact surface 15b of the seat liner 15 is formed into a spherical shape, and further, the protrusion 15c is formed on the boss contact surface 15b of the seat liner 15,
Alternatively, the protruding portion 15d is formed to maintain the sealing property. As shown in FIGS. 13 to 18, the seat liner 15
A protrusion 19 having an appropriate shape is formed on at least one side of the contact surface between the backup sheet 14 and the backup sheet 14 to ensure high sealing performance and low operating torque.

Also, a disc 17 provided in the body 1
The lower stem 20 is inserted into the lower cylindrical portion 4a of the seat ring 4, the inner portion of the charging groove 21 formed in the lower stem 20 is formed into the conical surface 22, and the lower body 20 is inserted into the charging groove 21. Bottom cap 23 screwed in from below
The central cylindrical portion 24 is inserted with a slight clearance, and the bottom cap 23 is formed with a communication hole 25 through which the conical surface 22 of the insertion groove 21 and the outside of the bottom cap 23 communicate. As another example, in FIG.
The boss portion contact surface 15 of the seat ring 4 is attached to the boss portion 16 provided on the diametrically opposed surface of the stem 18 of the disc 17 provided therein.
b is slidably contacted with each other, and a communication hole 26 for communicating this contact surface with the outside of the body 1 is formed in the seat ring 4 and the lower part of the body 1. Further, as described above, the disc 17 is made integral with the stem so as to be compact and sterilized.
Has a shape capable of taking a large flow-through aperture area when fully opened, and in particular, as shown in FIGS. 6 to 9, a curved surface portion 27 having an appropriate shape can be formed to control the flow rate of the internal fluid.
It is possible to prevent deterioration of the disc 17 and the seat ring 4 due to the minute opening and to alleviate the high flow velocity. This curved surface portion 27 is
In FIG. 9, the relationship of α ° <β °, 2α ° ≈β ° is 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
From one side, the disc-integrated stem 18 is inserted into the shaft mounting portion 1b, and the seat ring 4 is attached to the body body 1
When the cap 5 is inserted from the other side while connecting them by the connecting means of the ferrule clamp 11 or the method of the bolt 6, or the tightening method of the union nut 12 or the screwing means 13, Since the both sides of the seat ring 4 are held by the stepped portion 3 and the tip end surface of the cap 5 with a confining pressure, the sealability of the seat ring 4 is maintained and deformation due to fluid pressure is reliably prevented.

Then, when the upper gland 28 and the bottom cap 23 are retightened by a preset tightening margin, the backup sheet 14 is compressed and its volume is expanded, so that the seat liner 15 is made to have elasticity. You can Further, since the communication hole 25 that allows the conical surface 22 of the charging groove 21 formed in the lower stem 20 and the outside of the bottom cap 23 to communicate with each other is provided, even if the internal seat portion is damaged in some way, Since the fluid travels through the sheet portion and leaks from the communication hole 25, the leak phenomenon can be visually recognized from the outside, and reliable maintenance can be performed, which is extremely safe. Moreover, the bottom cap 2
When 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 inner portion of the charging groove 21, so that the disk or stem is deformed or misaligned due to internal flow pressure resistance. Can be prevented.

Further, since the body 1 is of a type separated from the cap 5, the sealing property and the processing accuracy are good, 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 body 1. In this case, when the bracket 8 is used as shown in FIG. 5, the actuator having a heat radiation effect can be mounted. it can.

Therefore, according to the present invention, the following excellent effects can be obtained. It is possible to provide an aseptic valve that exhibits sanitary properties, and in particular, it has excellent sealing properties.
There is an effect that it is possible to provide a new and useful butterfly valve which is easy to disassemble and assemble and is easy to clean.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view in which a central position of FIG. 1 is cut.

FIG. 3 is a plan view of FIG.

FIG. 4 is a vertical sectional view showing a state where the actuator is mounted in FIG.

5 is a vertical cross-sectional view in which an actuator is mounted via a bracket in FIG.

FIG. 6 is a side view of the disk in the present invention.

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

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

9 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 10 is a vertical cross-sectional view showing a state where the body body and the cap are connected to each other by bolts.

FIG. 11 is a vertical cross-sectional view of the body main body and the cap in a state in which the union nut is coupled.

FIG. 12 is an enlarged vertical cross-sectional view of a state where the body body and the cap are screwed together in the portion a of FIG.

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

FIG. 14 is a partially enlarged cross-sectional view showing an example of a joined state of the sheet liner and the backup sheet in the part b of FIG.

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

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

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

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

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

FIG. 20 is a vertical cross-sectional view of the seat liner.

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

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

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

FIG. 24 is a side view of the disc.

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

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

[Explanation of symbols]

 1 Body Main Body 1a Flange 1b Shaft Mounting Section 1c Flange Section 2 Flow Path 3 Step Section 4 Seat Ring 4a Lower Cylindrical Section 5 Cap 5a Flange 6 Bolt 7 Actuator 8 Bracket 9 Handle Stopper 10 Manual Handle 11 Union Rule 12a Gasket 13 screwing means 14 backup sheet 15 seat liner 15a tubular portion 15b boss contact surface 15c protrusion 15d ridge 16 boss 17 disc 17 stem 19 protrusion 20 lower stem 21 charging groove 22 conical surface 23 bottom cap 24 Central tubular part 25 Communication hole 26 Communication hole 27 Curved surface part 28 Ground

Claims (14)

[Claims] 1. A seat ring is attached to an inner peripheral surface of a flow passage provided in a body main body at a substantially central position.
A ring-shaped backup sheet formed of an elastic material such as rubber disposed on the outer peripheral surface, and a synthetic resin sheet liner provided on the inner peripheral surface of the backup sheet,
A disc having upper and lower boss portions is rotatably slidably contacted with the inner peripheral surface of the seat ring, and a stem is integrally formed in the diameter direction of the boss portion of the disc. Butterfly valve characterized by being inserted into. 2. A seat ring is attached to a step formed on one side of a flow path of the body main body, and the seat ring is held by a cap provided from the other side of the body main body. Butterfly valve. 3. The butterfly valve according to claim 1, wherein the flange of the body and the flange of the cap are provided so as to be able to come into contact with and separate from each other via a ferrule clamp. 4. The butterfly valve according to claim 1, wherein the body and the cap are provided so as to be able to come into contact with and separate from each other by means of bolt fastening, union nut fastening or screw fastening means. 5. The butterfly valve according to claim 1, wherein the outer peripheral surfaces of the boss portions formed on the upper and lower sides of the disc are spherical. 6. A seat portion having a U-shaped cross section, wherein a tubular portion is integrally formed at a stem holding position, and a backup sheet is provided on the outer periphery of the seat liner and the outer periphery of the tubular portion. The butterfly valve according to claim 1. 7. The butterfly valve according to claim 1, wherein the contact surface of the boss portion of the seat liner is formed into a spherical shape. 8. The butterfly valve according to claim 1, wherein a protrusion is formed on the contact surface of the boss portion of the seat liner. 9. The butterfly valve according to claim 1, wherein a projection having an appropriate shape is formed on at least one side of the contact surface between the seat liner and the backup sheet. 10. A lower stem of a disc provided in a body body is inserted into a lower tubular portion of a seat ring, and a deep portion of a charging groove formed in the lower stem is formed into a conical surface, and the inside of the charging groove is formed. The central cylindrical part of the bottom cap, which is screwed in from the bottom of the body, is inserted with a slight clearance, and the bottom cap has a communication hole that connects the conical surface of the insertion groove and the outside of the bottom cap. The butterfly valve according to claim 1, wherein the butterfly valve is provided. 11. A contact surface of a boss portion of a seat ring is slidably brought into contact with a boss portion provided on a diametrically opposed surface of a stem of a disc provided in the body body, and the contact surface and the outside of the body body. 10. The butterfly valve according to claim 1, wherein a communication hole communicating with each other is formed in a lower portion of the seat ring and the body of the body. 12. The flow rate can be controlled by forming a curved surface portion of an appropriate shape on the surface of the disk.
To 11 butterfly valves. 13. The butterfly valve according to claim 1, wherein an actuator is mounted on a flange portion formed at an upper end of a shaft mounting portion of the body body via a bolt. 14. A bracket is provided on a flange portion of an upper end of a shaft mounting portion of a body body, and an actuator is mounted via the bracket.
Butterfly valve.