JPH03134378A - Butterfly valve - Google Patents

Abstract

PURPOSE:To lighten a valve by putting the valve seat of a valve box to the integrated type with the valve box, and putting the valve seal of a valve disc to the rigid body seal type, wherein metallic material high in bearing strength is used, and further putting it to the valve seal type of double seal where an O ring, the elastic body, high in sealing properties is set. CONSTITUTION:The bottom face AE of a valve disc is set to the position close to the end face 14 of a valve box, and a dovetail groove S is provided in circular shape at the valve seal WN of the valve disc in contact with the middle of the reverse- conical band-shaped valve seat AB of the valve box, and an elastic body O ring is set in this dovetail groove. From the point G at the lower end of the dovetail to the valve seat FF, a vertical GH is drawn, and also from the point A at the lower end of the valve seat AB, a perpendicular AD is drawn, and the intersection is made I, and the position of point C near, within angles DIG, to the center line O-O' of the valve seat of the valve box is made the center of a valve stem 3. The valve seat AB of a valve box AB and the valve seal AW of the valve disc are set in annulation in contact, within the range where respective angles D are set to 68 deg.+ or -5 deg., and also the angle theta of the upper end face of the dovetail groove S is set to an angle larger than theta'.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates primarily to a valve used in the field of mixing tanks for powder and granular materials or related piping, and particularly relates to valves used in the field of mixing tanks for powder and granular materials or related piping. It must be easy to clean the inside, be easy to disassemble and inspect even when attached to the tank, be easy to operate, and be lightweight.

(Prior Art) Conventionally, valves used as opening/closing mechanisms in the field of mixing tanks for powder and granular materials or piping thereof have a central shaft-shaped valve body, and an elastic valve seat between the valve body and the valve body. Butterfly valves with a ring-shaped body are often used. Therefore, commercially available products of the same shape,
This is a flangeless wafer type butterfly valve shown in Fig. 5, and the U symbol part in the figure becomes a liquid reservoir, and during mixing,
It has drawbacks such as causing abnormal flow. In addition, this form requires a companion flange 8 for connection to the tank, making installation complicated and making it difficult to reduce the weight to accommodate the rotational movement of the tank. Furthermore, the structure is such that the elastic valve seat cannot be replaced without removing it from the tank or piping. Next, Figure 6 shows the
895, which shows the structure of a double eccentric shaft type butterfly valve, in which the bottom surface of the valve body is inclined with respect to the axis of the valve box membrane, and therefore the angle of the valve seat surface is , and because the bottom surface of the valve body cannot be shaped close to the inner wall surface of the mixing tank due to the position of the valve shaft center, a liquid pool occurs in the U symbol part, which prevents abnormal flow when mixing powder particles. It is a structure that lacks correspondence.

Although the known examples have been described above, all of them have some kind of drawback and have a structure that cannot provide sufficient functionality.

(Problems to be Solved by the Invention) The present invention is based on the actual situation of the conventional type described above, and in order to solve the problems, in a butterfly valve, the bottom surface AE of the valve body is brought as close as possible to the end surface 14 of the valve body, , it is desirable to have a shape similar to the flat or curved surface of the inner wall surface of the tank. In response to this request, we made the bottom surface AE of the butterfly valve flush with the inner wall surface of the tank, and ensured that both valve seats were in close contact or separated from each other during the opening and closing operations of the valve body. It is a necessary condition to be able to In order to set the structure of both valve seat surfaces and the position of the valve axis C shown in Fig. 1,
, Y, and Y' dimensions are important points.

(Means for solving the problem) The valve seat surface with the valve body is made integral with the valve body in order to reduce the weight of the valve, and the valve seat surface with the valve body is made integral with the valve body in order to reduce the weight of the valve seat.
It has a rigid valve seat shape that uses a metal material with high surface pressure resistance, and is fitted with an elastic O-ring with high sealing performance.
The valve seat type has a double seal. Set the bottom of the valve body to be at the end of the piping connection part of the valve box, and also set the Y dimension position so that the bearing part can be formed at an appropriate position within the face-to-face dimension of the valve box. Assume. Next, set the angle θ of the valve seat surface, and draw a perpendicular line GH1 from point G of the rigid valve seat surface and a perpendicular line AD from point A of the rigid valve seat surface.
, set the 0 point within the angle DIG, and assume the X dimension position of the valve stem. Also, θ′ of the angle L N N′ of the valve seat surface of the valve body
is set larger than θ. Finally, after confirming that the valve seat surface with the valve body can be brought into close contact and separated by opening and closing operations, the above assumed dimensions are set as the specified dimensions.

(Function) The valve seat surface AE of the valve body is set at a position close to the end face of the valve box on the tank connection side, and the X and Y positions are the positions of the valve axis that enable the valve body to open and close. In order to do this, A of the valve box valve seat
The angle θ of the B plane was set to 68°±5°. Also, the angle θ of the AW plane of the rigid valve seat part of the valve seat AL plane of the valve body is 68° ± 5
°, and the angle θ' of the upper surface LN plane of the dovetail groove NW part is 90
''. Draw a perpendicular line GH from point G on the valve seat surface of the valve body, and draw a perpendicular line AD from point A, and let the intersection point be I. Set the axis C point of the valve shaft within the angle DIE. , is set at a position close to the center line 0-0' of the valve seat surface of the valve box.The valve shaft 3 is connected to the valve body 2 via a bearing 5.With the valve shaft point C as the center, the valve opening direction When the valve body is rotated, point A on the valve seat surface becomes A-
.

The point G moves away from the W plane, and the G point moves away from the G plane. Next, in the rotation in the valve closing direction, the W point on the valve seat surface is pressed in the W-A direction, and the E point on the valve seat surface is pressed in the E→G direction, and the valve stem and valve are pressed together. My body doesn't move. The valve seat surface of the elastic O-ring Q surrounded by the dovetail groove S is in close contact with the valve seat surface AB with the valve body in the valve closing direction, and since it is an elastic body in the valve opening direction, the AB valve seat surface can be easily removed from. In addition, the LN surface on the upper part of the valve seat surface of the valve body has θ′ of 6
Since the angle is 5° to 90°, the valve can open and close freely without sliding against the AB plane.

(Example) FIGS. 1 and 2 show a valve seat surface according to the present invention, and
This is an explanatory diagram related to setting the valve stem position, showing the conical belt-shaped valve seat surface A of the valve body.
θ of B and EF is set to 70', and the valve seat surfaces AW and EG on the lower side of the valve body are also rigid valve seats, and θ is set to 70°. A dovetail groove S is provided in the middle WN and GM portions of the valve body valve seat, and an elastic body 01J ring Q is attached.

LN above the valve body and θ' of the MK portion are 90°. Perpendicular lines AD and GH are drawn from points A and G of the valve seat surface of the valve body, respectively, with respect to the valve seat surfaces AB1 and EG, and the intersection point is I, and the axis C of the valve shaft 3 is Corner DIG
The valve seat is set at a position close to the center line O-0' of the conical valve seat. FIG. 3 shows an embodiment according to the present invention, in which the bottom surface 11 of the valve body 2 is the AE surface in FIG. 1, and has a shape that matches the surface of the inner wall 10 of the tank 6. Bento box l
In order to make the valve body integral, the maximum diameter of the valve seat part of the valve body 1 is
The valve body 2 and the valve stem 8 can be assembled and mounted as having a smaller size than the discharge port 12 of the valve body 2 . The valve shaft center C is set at a position where the valve body can open and close in the manner shown in FIG. The valve shaft 3 is mounted on a bearing 5 and fixed to the valve body 2 with a bearing fitting 13. The valve box bearing 4 is disposed in the middle of the valve box 1 at the x, Y, and Y' dimensional positions shown in FIG.

(Effects of the Invention) From the above, according to the present invention, the following useful effects can be obtained.

(1) θ of the angle B A A' of the valve seat surface is approximately 70°,
Since θ' of the angle L N N' is set to θ〉θ', the distance Y between the valve axis C and the bottom surface AE of the valve body is set so that the bearing part can be properly adjusted within the standard dimension between the valve body surfaces. I was able to set it up. This allows the bottom surface of the valve body to be similar to and close to the inner wall surface of the tank, thereby eliminating a liquid pool and improving the mixing efficiency of powder fluid.

(2) Since the valve shaft center point C could be set at the X position close to the center line of the valve box valve seat, the opening/closing operation torque of the valve was reduced.

In addition, the bearing with the valve box can be installed at an appropriate position at the Y' distance between the valve plate upper surface LK of the valve body and the zero point of the valve axis, which allows the valve box to be integrated and , weight reduction was achieved.

(3) Since the valve body has a structure in which an elastic material such as synthetic rubber 01J is fitted in the dovetail groove of the valve seat surface, internal cleaning can be done with the valve body open without removing the valve box from the tank. , and the elastic valve seat can now be replaced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram relating to the setting of the valve seat surface and valve stem position according to the present invention. FIG. 2 is a partially enlarged view of the valve seat shown in FIG. 1. FIG. 3 is a sectional view of an embodiment in which a valve according to the present invention is directly attached to a tank. FIG. 4 is a sectional view of an embodiment of a clamp connection type valve according to the present invention. FIG. 5 is a cross-sectional view of a commercially available wafer-shaped central axis butterfly valve. FIG. 6 is a sectional view of a known double eccentric shaft embodiment. In the drawing 1,...valve box Q...0 ring 2,...
Valve body S... groove a,... valve stem
C...Valve shaft center 4,...Bearing with valve box 5,...Bearing with valve body 6,...Tank 7,...Connection clamp type joint 8,...Connection phase flange 9, ... Synthetic rubber valve seat 10, ... Inner wall of the tank 11, ... Bottom surface of the valve body 12, ... Bore part (outlet side) of the valve box 13, ・
...Holding fitting 14 of the bearing with the valve body, ...End face 0-0' of the valve body...Center line A-B of the conical odd valve seat surface...Valve seat surface with the valve body A-W... Rigid valve seat surface with valve body W-N...Elastic body valve seat surface with valve body A-E...Bottom surface of the valve body A-D...Perpendicular line from point A on the valve seat surface G-H...・Perpendicular line E-F from point G on the valve seat surface... Valve seat surface with valve body X... Distance Y between center line o - O' and valve axis C
Distance Y' between the bottom surface A-F of the valve body and the valve axis C
・Distance between the upper surface L- of the valve body and the valve axis C...perpendicular line A-
Intersection between D and GH...liquid pool

Claims (2)

[Claims] (1) In a butterfly valve having a structure in which the valve seat surface is in the shape of a conical band, the valve shaft is eccentric from the center line of the valve seat surface with the valve body, and is mounted at a position away from the valve seat surface, the valve body The bottom surface AE of the valve body is set at a position close to the end surface 14 of the valve body, and the valve body valve seat surface WN contacts the middle of the conical band-shaped valve seat surface AB with the valve body,
A dovetail groove S is provided in an annular shape, and an elastic O-ring Q is fitted into the groove. Draw a perpendicular line GH from point G at the lower end of the dovetail groove S to the valve seat surface EF, and draw a perpendicular line GH at the lower end of the valve seat surface AB.
Draw a perpendicular AD from the point, let its intersection be I, and make the angle DIG
The butterfly valve is characterized in that the center of the valve shaft 3 is set at point C, which is close to the center line O-O' of the valve seat surface with the valve box. (2) The valve seat surface AB with the valve box and the valve seat surface AW with the valve body are set in an annular shape so as to abut each other within a range where the angle θ of the angle BAA' is 68°±5°, and 2. The butterfly valve according to claim 1, wherein the angle θ' of the angle LNN' of the upper end face of the dovetail groove S is set to a larger angle than θ.