JPH0534363U - Chiyo valve - Google Patents

Abstract

(57) [Summary] [Purpose] To smooth the valve opening / closing operation and improve the durability of the valve seat by relaxing the stress of the seal portion against the sealing pressure when the valve is closed. [Structure] A valve body having two discs 2 and 2'symmetrically press-formed to form valve seat holding portions 4 and 4'on the outer periphery thereof and a valve seat holding portion 4 and 4 '. And the inner surface of the valve seat holding portion 7, 7'formed at the outer peripheral end of the valve seat holding portion 4, 4 ', which is formed of a ring-shaped seal portion 12 having an outer peripheral surface with a mountain-shaped cross section. And the base of the seal 12 form gaps 13, 13 '.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a butterfly valve, which is intended to relieve stress in a sealing portion against a sealing pressure, thereby improving smoothness of valve opening / closing operation and improving durability of a valve seat.

[0002]

[Problems to be solved by conventional techniques and devices]

 In a butterfly valve in which a valve seat is mounted on the outer peripheral portion of this type of valve body, the valve main body is formed of a disc-shaped rigid body, and an annular shape is formed in the valve seat mounting groove formed on the outer peripheral portion. A valve seat is fitted, or an annular valve sheet is sandwiched by one sandwiching part that is integrally provided around the valve body and the other sandwiching ring that is mounted opposite to this sandwiching part. In general, the valve seat seals the valve seat against the valve box in a wide shape in the axial direction of the box to increase the contact area between the valve seat and the valve box. The leakage of fluid is prevented.

However, forming the seal portion of the valve seat for the valve box in a wide shape in the box axis direction can prevent fluid leakage at the time of valve closing, but on the other hand, at the time of valve closing operation and valve opening. Not only does the sliding contact length of the seal part with the valve box during operation increase, which reduces the smoothness of valve opening and closing operations, but also increases the amount of deformation of the seal part, causing deterioration of the seal part and especially closing the valve. During operation, the trailing side of the seal portion is bent and deformed from the outer peripheral edge of the valve body, causing rapid deterioration of the trailing side of the seal portion, resulting in a significant decrease in the durability of the valve seat.

The present invention solves the above-mentioned problems of the prior art. The elasticity of the valve body formed by sheet metal working by a press and the inner surface of the valve seat holding portion of the valve body and the outer peripheral surface of the valve seat. The gap formed between the base of the seal part and the base of the seal part, and the cross-sectional shape of the seal part cooperate with each other to relieve the stress of the seal part against the seal pressure, thereby opening and closing the valve. It is an object of the present invention to provide a butterfly valve which can improve the smoothness of operation and the durability of a valve seat.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the butterfly valve of the present invention, the valve rod mounting portion and the valve seat clamping portion are formed in the radial direction by the symmetrical press forming of two discs. It has a valve body and an annular valve seat sandwiched between the valve seat sandwiching parts, and is formed on the inner surface of the valve seat sandwiching part formed on the outer peripheral end of the valve sheet sandwiching part and the outer peripheral surface of the valve seat. A gap is formed between the base of the formed seal having a mountain-shaped cross section.

[0006]

[Action]

 The butterfly valve constructed as described above has a valve body in which a valve rod mounting portion and a valve seat holding portion are formed in the outer peripheral portion in a radial direction by symmetrical press forming of two discs, and a valve. Since it has an annular valve seat sandwiched in the seat sandwiching part, the butterfly valve can be freely rotated through the valve rod mounted in the valve stem mounting part in the valve box interposed in the fluid passage. The valve passage is closed or opened when the butterfly valve is closed or opened, but the outer peripheral surface of the seal part of the valve seat that is sandwiched between the valve seat sandwiching parts is closed. Since it has a mountain-shaped cross section, the sliding contact length of the seal part with the valve box during valve closing and opening operations can be minimized, so valve opening and closing operations can be performed. The smoothness of the seal can be improved and the seal of the seal part can be improved. Deformation amount due can also be minimized.

Moreover, since a gap is formed between the inner surface of the valve seat holding portion formed at the outer peripheral end of the valve seat holding portion and the base portion of the seal portion of the valve sheet, the valve closing operation is performed. At the same time, the bulging deformation that occurs on the subsequent side of the seal part due to the seal pressure is absorbed in the gap between the base part of the seal part and the valve seat holding part, and in addition, excess seal pressure is applied to the sheet metal working by pressing. It is reduced by the elasticity of the valve body molded by.

Therefore, the cross-sectional mountain shape of the seal portion as a whole, the gap formed between the inner surface of the valve seat holding portion of the valve body and the base portion of the seal portion of the valve seat, and further the sheet metal working by pressing It is possible to prevent deterioration of the sealing function of the seal portion by relaxing the stress of the seal portion against the seal pressure by the three-way cooperation with the elasticity of the molded valve body.

[0009]

【Example】

 An embodiment will be described with reference to the drawings. 1 is a valve body, and the valve body 1 is composed of two discs 2 and 2 ', and each disc 2 and 2'is symmetrical. By press molding, the valve rod mounting portions 3, 3'are formed in the radial direction and the valve seat holding portions 4, 4'are formed on the outer peripheral portion. Each valve rod mounting portion 3, 3'has a right-angled cross-section between each rib 5, 5'which is formed at a central portion in a direction orthogonal to the rod shaft and each valve seat holding portion 4, 4 '. Each valve rod fitting portion 6, 6'is formed and each valve seat holding portion 4, 4'in each valve rod mounting portion 3, 3'is formed in a semicircular shape. Further, the valve seat holding portions 4, 4'excluding the valve rod mounting portions 3, 3'are provided with valve seat holding portions 7, 7'at their outer peripheral ends inclining in opposite directions. At the same time, the locking seats 8 and 8'in the circumferential direction are formed in the radial center portions of the valve seat holding portions 4 and 4 ', respectively, so as to project in the opposite direction at the same time when the valve body 1 is press-molded. ..

On the other hand, the valve seat 9 that is sandwiched between the valve seat sandwiching portions 4 and 4 ′ of the valve body 1 is formed in an annular shape, and the circular valve stems are opposed to each other in the radial symmetrical position. The fitting portions 10 and 10 are formed, and the locking grooves 11 extending in the circumferential direction are formed in the radial center portions on both sides of the valve seat 9 excluding the valve rod fitting portions 10 and 10. 11 'is recessed corresponding to each locking strip 8, 8'of the valve body 1. Further, the seal portion 12 formed on the outer peripheral surface of the valve seat 9 is formed in a mountain-shaped cross section, and the top ridge line of the seal portion 12 is displaced L toward the valve opening direction side with respect to the center plane of the valve seat 9. Has been formed.

The valve seat 9 thus formed is locked in the respective locking grooves 11, 11 ′ by the respective locking ridges 8, 8 ′ formed in the respective valve seat holding portions 4, 4 ′ of the valve body 1. As a result, the discs are sandwiched between the valve seat clamping portions 4 and 4 ', and the discs 2 and 2'between the valve rod mounting portions 3 and 3'of the valve body 1 and the valve seat clamping portions 4 and 4'are separated. By fixing the contact portion by fixing means such as spot welding, the valve seat 9 is sandwiched between the valve seat sandwiching portions 4 and 4'of the valve body 1 and the valve seat sandwiching portions 4 and 4'of each valve seat sandwiching portion 4 and 4 '. Gaps 13, 13 'are formed between the inner surface of each valve seat holding portion 7, 7'formed at the outer peripheral end and the base of the seal portion 12 having a mountain-shaped cross section formed on the outer peripheral surface of the valve seat 9, respectively. And the top ridge of the seal portion 12 is formed on the valve box 14 with respect to the peripheral edge portion of each valve seat holding portion 7, 7 '. It is projected to adapt to the seal pressure.

Since the embodiment is constructed as described above, the valve body 1 is formed by sheet metal working of the two discs 2 and 2 ′ by pressing, so that its manufacture is easy. Since the locking grooves 11, 11 ′ of the valve seat 9 are locked by the locking ridges 8, 8 ′ of the valve seat sandwiching parts 4, 4 ′ of the valve body 1, the valve seat 9 is locked by the valve body 1. The valve seat 9 can be accurately attached to the valve seat 9 and the valve seat 9 can be prevented from falling off due to suction due to a negative pressure phenomenon in the fluid passage. Moreover, the valve main body 1 can be reinforced by the respective locking ridges 8 and 8'formed by press molding the valve seat holding portions 4 and 4 '.

Further, between the elasticity of the valve body 1 formed by sheet metal working by a press and the inner surface of each valve seat holding portion 7, 7 ′ of the valve body 1 and the base portion of the seal portion 12 of the valve seat 9. The deterioration of the sealing function of the seal part 12 is prevented by relaxing the stress of the seal part 12 against the seal pressure by the three-way cooperation of the formed gaps 13 and 13 'and the cross-sectional mountain shape of the seal part 12. be able to.

Further, since the top ridge line of the seal portion 12 having a mountain-shaped cross section is formed by being displaced L toward the valve opening direction side with respect to the center plane of the valve seat 9, the seal portion 12 has a cross section on the valve closing direction side. Since the mountain shape becomes gentle and the sliding contact length of the seal portion 12 with respect to the valve box 14 at the time of valve opening / closing operation is shortened, the smoothness of the valve opening / closing operation can be improved and at the time of valve closing operation. It is possible to effectively increase the seal pressure by increasing the pressing working angle of the seal portion 12 with respect to the valve box 14 in FIG.

In the embodiment, the top ridge line of the seal portion 12 of the valve seat 9 is formed by being displaced L toward the valve opening direction side with respect to the center plane of the valve seat 9, but the seal portion 12 of the seal portion 12 is described. It goes without saying that the object of the present invention can be achieved in the same manner even when the top ridge line is coincident with the center plane of the valve seat 9.

[0016]

[Effect of the device]

 The present invention is configured as described above, and the valve body has the valve rod mounting portion and the valve seat clamping portion on the outer peripheral portion formed in the radial direction by symmetrical press forming of two discs. Therefore, the manufacture of the valve body can be facilitated and the cost can be reduced. Since the outer peripheral surface of the seal portion of the valve seat sandwiched between the valve seat sandwiching portions has a mountain-shaped cross section, it seals the valve box during valve closing and opening operations. Since the sliding contact length of the portion can be minimized, the smoothness of the valve opening / closing operation can be improved and the amount of deformation of the seal portion due to the sealing pressure can be minimized. Moreover, since a gap is formed between the inner surface of the valve seat holding portion formed at the outer peripheral end of the valve seat holding portion and the base portion of the seal portion of the valve seat, a seal is formed during the valve closing operation. The bulging deformation that occurs on the trailing side of the seal part is absorbed by the gap between the base part of the seal part and the valve seat holding part, and in addition, excess seal pressure is formed by sheet metal working by a press. The elasticity of the valve body is reduced. Therefore, as a whole, from the above points, the three-dimensional cooperation of the gap between the cross-sectional mountain shape of the seal part and the valve seat holding part at the base part of the seal part, and the elasticity of the valve body formed by sheet metal working by pressing is By alleviating the stress of the sealing part against the sealing pressure, it is possible to prevent the deterioration of the sealing function of the sealing part and thus improve the durability of the valve seat.

[Brief description of drawings]

FIG. 1 is a front view of a butterfly valve.

FIG. 2 is a side view of a butterfly valve.

FIG. 3 is a plan view of a butterfly valve.

FIG. 4 is a cross-sectional plan view taken along the line AA in FIG.

FIG. 5 is an enlarged cross-sectional view showing a main part of a butterfly valve rotated by 90 °.

[Explanation of symbols]

 1 valve body 2,2 'disk 3,3' valve rod mounting part 4,4 'valve seat holding part 7,7' valve seat holding part 9 valve seat 12 sealing part 13,13 'gap

Claims (1)

[Scope of utility model registration request] 1. A valve main body having a valve seat mounting portion and a valve seat sandwiching portion formed in an outer peripheral portion in a radial direction by symmetrical press forming of two discs, and an annular body sandwiched by the valve seat sandwiching portion. And a valve seat, and a gap is formed between the inner surface of the valve seat holding portion formed at the outer peripheral end of the valve seat holding portion and the base of the cross-sectional chevron seal portion formed on the outer peripheral surface of the valve seat. A butterfly valve characterized by being formed.