JP2509859Y2 - Seat ring fixing device for butterfly valves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for fixing a rubber seat ring of a butterfly valve to an inner surface of a main body made of a steel pipe.

[Conventional technology]

As shown in FIG. 3, a conventional butterfly valve has an annular shape that fits inwardly curved ear portions 2a of a rubber seat ring 2 on a side peripheral surface of a body (valve body) 1 made by casting. A groove 1a is formed, and the ear portion 2a of the seat ring is fitted into the groove 1a to hold the seat ring 2 and seal between the side surface of the seat ring and a flange surface of a pipe end (not shown) (flange seal). And are doing. In the figure, 3 is a valve body and 4 is a valve rod.

When the valve is operated, by rotating the valve rod 4 from the outside, the valve body 3 rotates in the range of 0 to 90 °, and the fluid flowing in the main body 1 is detached from the valve body 3 and the rubber seat ring 2. It can be closed (position shown) or opened.

[Problems to be solved by the device]

In the above-mentioned conventional butterfly valve, the main body 1 is made by casting, and in order to assemble the rubber seat ring 2 to the main body 1, both the main body 1 and the seat ring 2 have complicated groove 1a and The ears 2a had to be formed.

Therefore, it takes a lot of man-hours to process the main body 1, and
On the other hand, in forming the seat ring 2, there has been a problem that the die becomes complicated and therefore the cost becomes high.

An object of the present invention is to solve the above-mentioned problems of the conventional technology and to provide a butterfly valve which is highly productive, inexpensive and lightweight.

[Means for solving the problem]

In order to achieve the above-mentioned object, the invention of claim 1 is a butterfly valve whose main body is made of steel pipe. In the butterfly valve, the both ends of a cylindrical rubber seat ring stretched on the inner surface of the main body are made thin pipes. It is formed by a press die, etc., and the axially outer side is fitted into the groove portion on the inner surface of the main body and fixed in the axial direction.
Each of the seat retainers is press-fixed on the inner side in the axial direction, and the invention of claim 2 is characterized in that both ends of a cylindrical rubber seat ring stretched on the inner surface of the inner diameter of the main body, A thin pipe is formed into a stepped cylinder with a large diameter part and a small diameter part by a press die, and a tongue-shaped notch provided at one end of the large diameter part is forcibly inserted into the groove provided on the inner surface of the main body. It is characterized in that the small diameter portions of the two projecting seat retainers are respectively pressed and fixed.

[Action]

Since the present invention is configured as described above, the present invention
According to the invention, a cylindrical rubber seat ring made of a commercially available steel pipe and stretched on the inner peripheral surface of the inner diameter of the main body is formed by pressing a thin-walled pipe with a press die or the like to form an outer side in the axial direction. The seat rings are fixedly supported in the radial direction and the axial direction because they are respectively pressed and fixed on the inner sides in the axial direction of the two seat retainers that are fitted in the groove portions on the inner surface of the main body and fixed in the axial direction.

As described above, since the cylindrical rubber seat ring is fixed to the inner surface of the inner diameter of the main body in the radial direction and the axial direction, the movement of the seat ring due to friction when sliding with the seat ring due to the opening / closing operation of the valve body. It is also possible to suppress the movement of the seat ring due to the flow velocity of the fluid.

In addition, according to the invention of claim 2, the both ends of the cylindrical rubber seat ring stretched on the inner surface of the inner diameter of the main body,
A thin pipe is formed into a stepped cylinder with a large diameter part and a small diameter part by a press die, and a tongue-shaped notch provided at one end of the large diameter part is forcibly inserted into the groove provided on the inner surface of the main body. By pressing and fixing the small diameter portions of the two projecting seat retainers respectively, the rubber seat ring can be easily and more reliably fixed to the inner surface of the main body with a simple structure.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing a closed state of a butterfly valve according to an embodiment of the present invention, in which the same reference numerals as those shown in FIG. 3 denote the same or similar parts. And

In the figure, the main body 11 is made of a commercially available steel pipe, and the seat ring stretched at the position corresponding to the circumferential surface of the valve body 3 on the inner surface of the inner diameter of the main body is made of a cylindrical rubber. The seat ring 12 is formed, and both axial ends of the cylindrical rubber seat ring 12 are fixed to the inner surface (inner peripheral surface) of the main body 11 by a seat retainer 15 described below.

As shown in FIGS. 2A and 2B, the seat retainer 15 is formed by forming a thin pipe into a stepped cylinder having a large diameter portion 15a and a small diameter portion 15b by a press die or the like, and by the small diameter portion 15b, Both ends of the seat ring 12 are sandwiched so as to be restrained from the inner side in the radial direction, and tongue-shaped notches 16 provided at several places at one end of the large diameter portion 15a are enlarged views of a main part (A portion) of FIG. 1a. As shown in FIG. 3, the seat retainer 15 is axially held by forcibly fitting the groove 17 formed in the inner surface of the main body 1 from the inner side toward the outer side in the radial direction. The seat ring 12 made of steel is easily and surely fixed in the main body 1. In the figure,
4a is a lower valve rod, 18 is an O-ring, 19 is an O-ring holder, 20
Is a bonnet, 21 is an upper bearing, and 21a is a lower bearing.

With the above-mentioned configuration, the main body 11 is made of a commercially available steel pipe, so the rubber seat ring 12 for the main body 11 may be an extremely simple cylindrical shape, and the seat retainer 15 that suppresses the seat ring 12 is also included. A commercially available thin-walled pipe press-molded is sufficient. Moreover, the seat retainer 15 is fitted from the inside by sandwiching the seat ring 12 from both sides in the main body 11, and the tongue-shaped notch 16 is forcibly extended and fitted into the groove 17 provided on the inner surface of the main body, The seat ring 12 can be easily and surely fixed in the main body 11.

In this way, movement of the seat ring 12 due to friction when sliding with the rubber seat ring 12 during opening / closing operation of the valve body 3 is suppressed, and the seat ring due to the flow velocity of the fluid is suppressed.
You can eliminate 12 moves.

In the embodiment described above, the large diameter portion of the seat retainer 15
Needless to say, the shape and number of the tongue-shaped notches 16 formed at one end of 15a and the shape and number of the corresponding grooves 17 on the inner surface of the main body 11 can be appropriately changed.

[Effect of device]

As described above, according to the present invention, in the invention of claim 1, in a butterfly valve whose main body is a copper tube, both ends of a cylindrical rubber seat ring stretched on the inner surface of the inner diameter of the main body. On the inner side in the axial direction of the two seat retainers that are fixed in the axial direction by forming a thin pipe with a press die or the like and fitting the outer side in the axial direction into the groove on the inner surface of the main body,
The following effects can be obtained by pressing and fixing them.

(I) Since the main body is composed of a commercially available steel pipe, the shape of the rubber seat ring can be simplified to a cylindrical shape, and the seat retainer that suppresses it can also use a commercially available thin pipe, and is further processed by press molding. Therefore, there is no waste meat, the cost is low, and the productivity can be remarkably improved.

(Ii) Both ends of a cylindrical rubber seat ring stretched on the inner surface of the main body are fixed in the axial direction by fitting a thin pipe into a groove on the inner surface of the main body by molding a thin pipe with a press die or the like. By pressing and fixing each of the two seat retainers on the inner side in the axial direction, the cylindrical rubber seat ring can be easily fixed to the inner surface of the inner diameter of the main body in the radial direction and the axial direction with a simple configuration.

Further, in the invention of claim 2, the seat retainer for suppressing the seat ring is formed into a stepped cylinder having a large diameter portion and a small diameter portion from a thin pipe by a press die or the like, and a tongue notch is formed at one end on the large diameter side. The cylindrical rubber seat ring can be easily and more surely fixed to the inner surface of the main body with a simple structure by providing the above-mentioned structure and forcibly protruding and fitting it into the groove portion of the inner surface of the main body.

As described above, it is possible to provide a butterfly valve which has a simple structure, is easy to process and assemble, and thus has high productivity, low cost, and light weight.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a butterfly valve showing an embodiment of the present invention, FIG. 1a is an enlarged sectional view of an essential part of FIG. 1A, and FIGS. 2A and 2B are side views of a seat retainer. FIG. 3, a front sectional view, and FIG. 3 are vertical sectional views of a butterfly valve showing a conventional example. 3 ... Valve, 4 ... Valve, 11 ... Main body, 12 ... Rubber seat ring, 15 ... Seat retainer, 15a ... Large diameter part, 1
5b ... Small diameter part, 16 ... tongue notch, 17 ... groove.

Claims (2)

(57) [Scope of utility model registration request] 1. A butterfly valve, the main body of which is a steel pipe, wherein both ends of a cylindrical rubber seat ring stretched on the inner surface of the main body are formed by pressing a thin-walled pipe or the like in the axially outer side of the main body. On the inner side in the axial direction of the two seat retainers that are fixed in the axial direction by fitting in the groove on the inner surface,
A seat ring fixing device for a butterfly valve, which is press-fixed. 2. A butterfly valve having a main body made of steel pipe, wherein both ends of a cylindrical rubber seat ring stretched on an inner surface of the inner diameter of the main body are divided into a large-diameter portion and a small-diameter portion by pressing a thin pipe with a press die or the like. In the small diameter part of the two seat retainers, a tongue-shaped notch that is formed into a stepped cylinder and is provided at several places at one end of the large diameter part is forcibly extended into the groove provided on the inner surface of the main body. A seat ring fixing device for a butterfly valve, which is press-fixed.