JPH0534366U - Chiyo valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To make the amount of protrusion of the valve seat with respect to the valve seat clamping portion accurate, prevent deterioration and falling of the valve seat, and reinforce the valve body. [Structure] A valve body having two discs 2 and 2'adhered to each other and having valve seat sandwiching portions 4 and 4'formed on the outer periphery thereof, and an annular valve seat sandwiched between the valve seat sandwiching portions 4 and 4 '. Consisting of 9 and
The engaging grooves 8, 11 'provided around both sides of the valve seat 9 are engaged with the engaging ridges 8, 8'which are provided around the valve seat holding portions 4, 4'by press molding. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a butterfly valve, which is intended to prevent the valve seat from deteriorating and falling off due to the suction action due to the negative pressure phenomenon of the fluid passage, and to reinforce the valve body, which is a sheet metal processed product, by the locking strip by press molding. Related to

[0002]

[Problems to be solved by conventional techniques and devices]

 In this type of valve, in which a valve seat is mounted on the outer periphery of the valve body, the valve body is made of a disc-shaped rigid body, and an annular ring is formed in the valve seat mounting groove formed on the outer periphery. Of the valve seat, or an annular valve seat with one holding part that is integrally provided around the valve body and the other holding ring that is attached to it by a fastening bracket so as to face the holding part. In general, the valve seat mounting part of the valve body is finished by cutting, and the protrusion amount of the valve seat with respect to the outer peripheral edge of the valve body is made uniform. ing.

However, not only is it costly to construct the valve body with a rigid body, but since the valve seat mounting portion of the valve body is finished by cutting, it is time-consuming to manufacture the valve body and When the seat mounting portion is formed by the valve seat mounting groove formed on the outer peripheral portion of the valve body, it is difficult to fit the annular valve seat into the valve seat mounting portion. Further, in the case where the valve seat mounting portion is formed by one holding portion integrally provided around the valve body and the other holding ring which is attached to the valve seat facing the valve body by the tightening metal fitting, the tightening by the tightening metal fitting is performed. Due to the strength, the sealing pressure in the circumferential direction of the valve seat becomes uneven. Furthermore, there is a problem in that the valve seat deteriorates due to the suction action due to the negative pressure phenomenon in the fluid passage, resulting in the valve seat falling off.

The present invention solves the above-mentioned problems of the prior art. A locking strip formed by press molding is formed on the opposite side of the valve seat holding portion of the valve body, and is formed on both sides of the valve seat. By engaging the locking groove, the amount of protrusion of the valve seat with respect to the outer peripheral edge of the valve seat holding portion is made accurate, and the deterioration of the valve seat caused by the suction action due to the negative pressure phenomenon of the fluid passage, or the like. It is an object of the present invention to provide a butterfly valve capable of preventing the valve body from falling off and reinforcing the valve body, which is a sheet-metal processed product, with a locking strip formed by press molding.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the butterfly valve of the present invention, a valve body in which a valve rod mounting portion and a valve seat holding portion are formed in an outer peripheral portion in a radial direction by two discs that are bonded to each other, An annular valve seat that is sandwiched between the valve seat sandwiching parts, and a locking strip that is formed in the circumferential direction by press molding on the opposite part of the valve seat sandwiching part. The engaging groove formed in the direction is engaged.

[0006]

[Action]

 The butterfly valve constructed as described above includes a valve main body having a valve stem mounting portion formed in the radial direction and a valve seat sandwiching portion on the outer peripheral portion by two discs bonded to each other, and a valve seat sandwiching portion. Since it has an annular valve seat sandwiched between the valve seat and the valve seat, the butterfly valve is rotatably mounted on the valve box mounted on the fluid passage via the valve shaft mounted on the valve shaft mounting part. By doing so, the fluid passage is closed or opened by the valve closing or opening operation of the butterfly valve, but the locking strips formed in the circumferential direction by press molding on the opposite part of the valve seat sandwiching part. Since the locking grooves formed in the circumferential direction are engaged on both sides of the valve seat, both the locking ridges of the valve seat holding portion and the locking grooves of the valve seat are formed in the mold. Since the molding dimensions are uniform and the valve is formed by the engagement of the locking ridge and the locking groove, The valve seat can be accurately attached to the outer peripheral edge of the valve holding portion with a uniform protrusion amount, and the valve seat is prevented from deterioration or falling off due to the suction action due to the negative pressure phenomenon of the fluid passage. Can be prevented. In addition, the valve body, which is a sheet metal product, can be reinforced by the locking strip formed by press molding of the valve sheet sandwiching portion.

[0007]

EXAMPLES Examples 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 ′. Is formed by symmetrical press forming in the radial direction with the valve rod mounting portions 3 and 3'and the outer peripheral portions with the valve seat holding portions 4 and 4 ', respectively. 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 sandwiched between the valve seat sandwiching portions 4 and 4 ′ of the valve body 1 is formed in an annular shape, and each of the circular seats faces the symmetrical position in the radial direction. The valve rod 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. Reference numeral 11 'is recessed in correspondence with each locking strip 8, 8'of the valve body 1. Further, the seal portion 12 formed on the outer peripheral surface of the valve sheet 9 is formed in a mountain-shaped cross section, and the top ridge of the seal portion 12 is directed toward the valve opening direction side with respect to the center plane of the valve seat 9. It is formed with a displacement L 1.

The thus formed valve seat 9 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 line 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 be applied to the sealing pressure.

Since the embodiment is configured 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 respective locking grooves 11, 11 'of the valve seat 9 are locked to the respective locking strips 8, 8'of the respective valve seat sandwiching parts 4, 4'of the valve body 1, the respective valve seat sandwiching parts 4, 4'. The valve seat 9 can be accurately attached to the outer peripheral edge of the ′ with a uniform protrusion amount, and the valve seat 9 can be prevented from deteriorating and falling off due to the suction action due to the negative pressure phenomenon of the fluid passage. it can. Moreover, the valve main body 1 which is a sheet metal processed product can be reinforced by the respective locking ridges 8 and 8 ′ formed by press molding the respective 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 cross section of the sealing portion 12 on the valve closing direction side is formed. 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 sealing pressure by increasing the pressing working angle of the seal portion 12 with respect to the valve box 14 in FIG.

In addition, by forming small grooves on both sides in the radial direction of each locking ridge 8, 8 ′ in each valve seat sandwiching portion 4, 4 ′ of the valve body 1, each locking ridge 8, 8 ′ is formed. By increasing the wall thickness and forming small ridges on both sides of the respective locking grooves 11, 11 'of the valve seat 9 corresponding to the small grooves, the valve seats for the respective valve seat clamping portions 4, 4'are formed. The locking of 9 can be further strengthened.

[0014]

[Effect of the device]

 The present invention is configured as described above, and since the valve body is formed by sheet metal working by pressing two discs, it is possible to facilitate the production and reduce the cost. You can A locking groove formed in the circumferential direction on both sides of the valve seat is engaged with a locking line formed by press molding in the circumferential direction on the opposite side of the valve seat sandwiching section. Therefore, since both the locking strips of the valve seat holding part and the locking grooves of the valve seat are formed by the mold in the same molding dimension, the valve seat holding part by the engagement of the locking line and the locking groove. By equalizing the amount of protrusion of the valve seat with respect to the outer peripheral edge of the valve seat, the valve seat can be mounted accurately, and the sealing function of the valve seat caused by the suction action due to the negative pressure phenomenon of the fluid passage or the like It is possible to prevent the valve seat from falling off. Moreover, it is possible to reinforce the valve body, which is a sheet-metal processed product, by the locking strip formed by press molding of the valve seat holding portion.

[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 8, 8'locking strip 9 valve seat 11, 11 'locking groove

Claims (1)

[Scope of utility model registration request] 1. A valve main body having a valve rod mounting portion and a valve seat sandwiching portion formed on an outer peripheral portion thereof in a radial direction by two discs bonded to each other, and an annular valve sandwiched between the valve seat sandwiching portions. The seat has a seat and a circumferentially formed locking groove is formed on both sides of the valve seat by engaging a circumferentially formed locking striation on a facing portion of the valve seat sandwiching portion by press molding. A butterfly valve characterized by being present.