JPH0676776U - Butterfly valve - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to develop a butterfly valve for sanitary products that can be easily and reliably disassembled, inspected, cleaned, and reassembled regularly. [Structure] After the valve shafts 4 and 5 of the valve body 3 are penetrated by a valve seat ring 6 made of an elastic body, they are sandwiched by a pair of straight tube type valve cases 1 and 2, and this is divided into a clamp 7 , 8 and fitted with bolts. The valve box does not have a bearing portion for the valve shaft, one end is fitted to a joint shape on the pipe side, the other end is provided with a spigot portion on the flange portion, and the valve seat ring is clamped to the spigot portion.
The slope, spigot or end face of the flange of the valve box, the inner face of the clamp, the slope and the inner face, and the valve seat surface of the valve body are in close contact with the contact surface on the entire circumference of the valve seat ring. It is installed.
As a result, the vertical axis and horizontal axis of the valve can be automatically retained.
Further, the stopper 12 is screwed into the flange portion 11 of the clamp, and the position of the stopper end surface V is adjusted, whereby the surface pressure of the valve seat surface can be fixed or increased or decreased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to sanitary specification piping for beverages, dairy products, pharmaceutical products, etc., or with a mixing tank for powder and granules, and a butterfly valve used for fluid control of the related piping.

[0002]

[Prior art]

 In conventional butterfly valves, the pipe and connection end have a joint shape integrated in the valve box.For example, wafer type with flange connection, ferrule joint type, screw type, butt welding type, etc. are specified. The shape of the valve box and the joint were difficult to separate. In addition, disassembling, cleaning, and reassembling the valve box, the valve body of the valve body, the valve seat ring, etc. were complicated and could not be done easily.

[0003]

[Problems to be solved by the device]

 Valves used for sanitary applications require a structure in which the fluid is rectified and there is no liquid pool inside the valve diameter, and it is possible to ensure regular disassembly, inspection, cleaning, and reassembly. It is a condition. Therefore, the connection end with the pipe and the valve box must be detachable. In addition, when reassembling each part, it has a structure that can be easily disassembled without using a special tool, and the horizontal axis and vertical axis of the valve are automatically centered so that liquid can be directly passed through the inside of the bore. No reservoir is required. Further, since the pressure resistance of the valve and the airtightness of the valve seat surface are ensured, a constant surface pressure is generated on the contact surface of the elastic valve seat ring, and the restoration at the time of reassembly can be facilitated. .

[0004]

[Means for Solving the Problems]

 The valve body and valve shaft are integrated with each other, and the valve shaft is closely attached to the valve seat ring so that it is assembled, and both ends are sandwiched between a pair of straight pipe type valve boxes. This is a butterfly valve structure in which it is fitted and fixed to the pipe with a clamp that is divided in the horizontal axis direction. In assembling the valve, first, a valve shaft with a valve element is penetrated into a valve seat ring to be assembled, and a pair of valve boxes are sandwiched from the side surface of the valve seat ring. One side of the valve box is shaped to match the joint shape on the piping side, the other end is flanged, and the slope is on the back and the spigot for fitting the valve seat ring is arranged on the end. The structure will be kept in mind. In addition, the bearing of the valve shaft with the valve body is installed only on the clamp side, not on the valve box, to avoid overlapping of the bearings and to simplify the process and facilitate centering.

The pressure resistance of the valve and the airtightness of the valve seat surface correspond to the surface pressure generated on the entire circumferential surface of the contact surface of the valve seat ring made of an elastic body, and the outer diameter surface of the valve seat ring. Is to be in contact with the inner diameter surface of the clamp, the side surface is in contact with the end surface of the valve box, and the inner diameter surface is in close contact with the outer peripheral valve seat surface of the valve body. These contact surfaces are provided with a rigid topper surface in order to make the compression margin of the elastic part a fixed size, and in combination with the above-mentioned centering structure, restoration during reassembly is easy and reliable. I have to.

Next, the clamp 12 is arranged on the flange portion 11 of the clamp, and the stopper 12 is screwed in close proximity to the bolt 10 for tightening both clamps, and the end surface V of the screw is used as the stopper surface. The bottom surface of the flange is contacted to allow the clearance R between the bottom surfaces of the flange to be adjustable.

Further, in order to prevent the joint portion between the valve box and the clamp from rotating due to vibration or the like, a notch portion is provided in the flange portion of the valve box, and the retainer attached to the clamp is The valve box and clamp are fixed by making contact with the notch.

[0008]

[Action]

 With the pair of valve boxes, the valve body integrated with the valve shaft, the detachable elastic valve seat ring, and the divided clamps configured as described above, the disassembly work of the valve is facilitated, and inspection, It became possible to reliably perform a series of cleaning and reassembly work.

In order to disassemble the valve, first, the drive mechanism for opening and closing the valve is removed from the clamp, then the nut of the bolt 10 for clamping the clamp is removed, and both clamps are disassembled. The valve box is automatically removed, the valve seat ring is disengaged from the short shaft with valve body and then from the long shaft, and all parts inside the valve are disassembled into a single unit. After inspection, these parts are cleaned, repaired or replaced if necessary.

To assemble the valve, the long shaft 4 with the valve body and then the short shaft 5 are inserted into the shaft hole of the elastic valve seat ring 6 and mounted, and the outer peripheral valve seat surface of the valve body and the valve seat ring are attached. After the valve is closed, that is, at the position where the inner diameter surface is in close contact, the outer diameter surface and the side surface portion of the valve seat ring 6 are sandwiched between the spigot parts J of the valve boxes 1 and 2, so that the parts inside the valve are It is automatically held to a fixed size, and in this state, it is fitted into the divided clamps 7 and 8 through the valve shaft to maintain the center, and then fixed by the tightening bolt 10. Further, a drive mechanism for opening and closing the valve is attached to complete the assembly work.

The pressure resistance of the valve and the airtightness of the valve seat surface when the valve is closed depend on the repulsive force of the elastic body generated between the entire circumferential surface of the elastic valve seat ring 6 and the surface abutting against this, so-called surface pressure. Held by. On the entire circumferential surface of the elastic body of the valve seat ring 6, the outer diameter surface F is the inner diameter surface C of the clamp, both side surfaces G and g are the inlay portions J of the valve box, and the inner diameter surface K is the valve seat of the valve body 3. The surface M and each elastic surface are brought into contact with the rigid surface. The dimension of the rigid surface is set in advance in consideration of the compression amount α at which a predetermined surface pressure is generated. For example, when the width of the side surface B-b of the clamp inner diameter portion is 1, the width of the side surface G-g of the elastic valve seat ring is L, and the depth of the spigot portion J of the end surface A of the valve box is y. , L = (l + 2y) + α holds, the dimensions of the corresponding part are set.

Stoppers 12 are disposed on the left and right flange portions 11 of the clamp 7, and the outer diameter portion of the stopper is brought into contact with the opposite side surface of the hexagonal head of the bolt 10 to stop the rotation of the bolt. In addition, the end surface V is moved as a stopper so that the clearance R between the bottom surfaces of the flanges is adjustable.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. FIG. 1 is a side view of a butterfly valve according to an embodiment of the present invention in an assembled state in which a drive mechanism is removed, and a cross-sectional view of other portions except a valve body. Is. The valve seat ring that passes through the valve shaft of the valve body 3 is sandwiched by the valve casings 1 and 2 in which the connecting end on the piping side is a ferrule joint type and the spigot part is provided on the flange part on the other end, and this is the bearing part. It is fitted and assembled by the clamps 7 and 8 having. FIG. 2 is a front view of FIG. 1, and one of the flange portions of the clamp is a partial sectional view, so that the clamps 7 and 8 are fixed and joined with a bolt 10. 3 (a) and 3 (b) are sectional views of a pair of valve boxes 1 and 2 and FIG. 3 (c) is a sectional view of an elastic valve seat ring 6. As shown in FIG. In the valve boxes 1 and 2, the connection end S with the pipe is a ferrule joint type, the back surface of the flange portion at the other end is an inclined surface E, and an inlet J is provided at the connection end with the valve seat ring. . A valve shaft hole U is provided in the valve seat ring, but the valve housing has no valve bearing portion. The side surfaces G and g of the elastic valve seat ring 6 are set to fit the spigot portion J of the valve box. The F surface is closely contacted with the C surface inside the clamp and the K surface is closely contacted with the valve seat surface of the valve body. It In addition, a rigid cored bar T is provided inside the valve seat ring for reinforcement when necessary for high-speed fluids. FIG. 4 is a sectional view of the parts of the clamps 7 and 8 similar to FIG. 3, in which the inner surface has a surface C that contacts the outer surface F of the valve seat ring 6, and a surface D that contacts the surface A of the valve box. The d surface and the B and b surfaces that are in close contact with the slope E of the collar portion are provided. FIG. 5 is a partial cross-sectional view of the flange portion 11 of the clamps 7 and 8, showing an embodiment in which the butterfly nut 14 is attached to the bolt 10 and both clamps are fixed. FIG. 6 is a partial plan view of FIG. 5, in which the stopper 12 is arranged close to the opposite side of the hexagonal head of the bolt 10. FIG. 7 is a partial cross-sectional view in which a hexagon socket set screw type screw is attached to the flange portion as the stopper 12, and shows an embodiment in which the end surface V of the screw is in contact with the bottom surface of the flange portion. FIG. 8 shows another embodiment of the valve boxes 1 and 2, in which the connecting end S with the pipe is of a screw joint type, the flange portion at one end is provided with the end face A and the spigot portion J, and the slope E A notch H is provided in the outer diameter portion of the. FIG. 9 is a front view of FIG. 8, in which a notch H is provided on the outer diameter surface of the collar portion, and the retainer 9 is in contact with the notch portion. The clamp shown in FIG. 4 is provided with an N hole at a position facing the notch H, and a retainer 9 is attached in contact with the N hole. FIG. 10 is a cross-sectional view of another embodiment of the valve boxes 1 and 2 in the case where the connection end S with the pipe is butt-welded. FIG. 11 shows an embodiment in which the connection end S has a flange shape as in FIG.

[0014]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. (1) An elastic valve seat ring is sandwiched between a pair of valve boxes according to the first aspect of the present invention, and the valve seat rings are fitted and fixed by separate clamps. The mating surface of the elastic body that contacts the entire circumference of the valve seat ring is made rigid, and in order to keep the surface pressure generated by compressing the elastic body surface constant, the contact surfaces are set to appropriate dimensions. . When reassembling after disassembling, it is possible to obtain a predetermined pressure resistance and an appropriate surface pressure required to keep the valve seat surface airtight. Therefore, the operating force for opening and closing the valve is constant and not excessive for a given fluid pressure, and quality is improved.

(2) The spigot portion J is provided on the end surface of the flange portion of the valve box according to claim 2, the outer diameter surface F of the valve seat ring is fitted to the spigot portion, and the end surface A is clamped. Is in contact with the end surface D-d of the inner diameter of. In addition, the bearing of the valve shaft with the valve body is not on the valve box side but only on the clamp side, which simplifies the assembly, and the horizontal axis and the vertical axis of the valve are automatically centered by the assembly. To be done. Therefore, there is no step on the diameter surface of the valve, and no liquid pool is generated, so that the fluid is rectified. In addition, the automatic maintenance of the core shortens the assembly time and improves the quality.

(3) A stopper 12 is provided on the flange portion of the clamp according to claim 3 in the vicinity of the bolt 10, and is generated from an elastic body of the valve seat ring 6 by adjusting the screw position of the screw portion of the stopper. It is now possible to freely adjust the surface pressure applied. As a result, it became possible to absorb the processing error of the parts and adjust the valve opening / closing operation force to suit the operating conditions.

The connecting end of the valve box is shaped and assembled according to the connecting shape of the pipe or the device. There are ferrule joint types, flange types, butt welding types, screw-in types, etc. at the connection end. is there. To cope with this, planned production of valve boxes is planned regardless of other parts, and product assembly is shortened by selective assembly. Since the valve box has a pipe shape with a direct bore, it is lighter in weight and easier to mirror-finish the wetted bore. Further, since the fluid does not come into contact with the clamp, it is possible to use a material having a low specific gravity or a low price, such as an aluminum alloy, regardless of the corrosion resistance, so that the weight and cost can be reduced.

[0018]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an assembly unit with a drive unit removed, which is a side view when a valve is opened according to an embodiment of the present invention.

2 is a front view of FIG. 1 and is a partial cross-sectional view of a part of a flange portion of clamps 7 and 8. FIG.

3 (a) and 3 (b) are valve boxes 1 and 2 and FIG. 3 (c) is a side sectional view of a valve seat ring 6.

FIG. 4 is a sectional view of a side view of clamps 7, 8.

FIG. 5 is a partial sectional view of a flange portion 11 of the clamp.

FIG. 6 is a partial plan view of FIG. 4, showing a state in which a stopper 12 is arranged.

FIG. 7 is a partial cross-sectional view in which a stopper 12 is attached to a flange portion.

FIG. 8 is a side view of another embodiment of the valve box.

9 is a front view of FIG. 8. FIG.

FIG. 10 is a sectional view of a side surface portion in another embodiment of the valve box.

FIG. 11 is a sectional view of a side surface portion in another embodiment of the valve box.

[Explanation of symbols]

 1 Valve box 2 Valve box 3 Valve body 4 Long shaft 5 Short shaft 6 Valve seat ring 7 Clamp 8 Clamp 9 Clasp 10 Bolt 11 Clamp flange part 12 Stopper 13 Bearing part 14 Wing nut A A valve box flange end face B Slope of clamp flange b Slope of the other flange of the clamp C Inner diameter surface of the clamp D End surface of the flange of the clamp d Edge of the other end of the flange of the clamp E Slope at the back of the flange of the valve box F Outside diameter of the valve seat ring Surface G Side of valve seat ring g Other side of valve seat H Notch J Inner part K Inner surface of valve seat ring M Valve seat surface of valve disc N Hole for attaching retainer R Between bottom of flange of clamp Gap S Connection end on the piping side of the valve box T Reinforcement mandrel of valve seat ring U Hole for valve shaft of valve seat ring V End face of screw y Depth of J part α Compression amount

Claims (3)

[Scope of utility model registration request] 1. A major axis (4) and a minor axis (5) with a valve body (3).
In a butterfly valve having a structure in which a valve seat ring (6) made of an elastic material penetrates through a shaft hole and is assembled, and the valve seat ring is sandwiched between the divided valve boxes (1) and (2). Box (1)
In (2), one end has a shape that matches the joint shape on the pipe side,
At the other end, a flange portion for sandwiching the valve seat ring (6) is arranged inside the valve, and the collar portion is fitted and fixed by divided clamps (7) and (8). The bearing portions (13) of the long axis (4) and the short axis (5) of the valve body are not provided in the valve boxes (1) and (2) but are provided in the clamps (7) and (8). The inner diameter side end surface (D-d) and slope (B-b) of the clamp, and the valve box (1) (2)
The end surface (A) and the sloped surface (E) of the collar portion of the valve abut, and the outer diameter surface (F) and the side surface (Gg) of the valve seat ring (6).
Also, the inner diameter surface (K) means the inner diameter surface (C) of the clamps (7) and (8), the end surfaces (A) of the valve boxes (1) and (2), and the valve seat surface (M) of the valve body (3). ) And the valve seat ring (6) in close contact with each elastic body surface, the butterfly valve. 2. A spigot portion (J) is provided on an end surface (A) of a collar portion of a valve box (1) (2), and an outer diameter surface (F) of a valve seat ring (6) is fitted to the spigot portion. The end face (A) of the collar portion of the valve box, and the end face (D-) of the clamps (7) and (8) on the inner diameter side.
The device according to claim 1, characterized in that the device is attached to and abutted against d).
Butterfly valve described in. 3. A stopper (12) is screwed onto the flange (11) of the clamp (7) or (8),
The butterfly valve according to claim 1 or 2, wherein a position of an end surface (V) of the stopper is moved so that a clearance (R) between bottom surfaces of the flange portion is adjustable.