JP2602581Y2 - High temperature ball valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature ball valve, and more particularly to a high-temperature ball valve for flowing or shutting off high-temperature coal gas obtained by gasifying coal.

[0002]

2. Description of the Related Art In a conventional ball valve, a high-temperature fluid can be passed or shut off without leakage because a sealing gasket capable of withstanding temperatures up to about 350 ° C. or higher does not exist. Rubber-based or resin-based packings cannot withstand high temperatures. Graphite-only packings can withstand high temperatures, but at temperatures around 400 ° C, they decompose and oxidize, making them unusable.

FIG. 4 shows an example of a conventional ball valve for high temperature.
There are the following. In this high temperature ball valve, a housing 102 penetrating the flow path 101 and a housing 104 penetrating the same flow path 103 are opposed to each other so that the flow path 101 and the flow path 103 communicate with each other. The cylindrical sheets 105 and 106 are press-fitted and fixed to the respective inner ends of the sheets 103.
At 106, a spherical ball 108 having a flow path 107 penetrating the center is held. The inner surfaces of the distal ends of the sheets 105 and 106 are formed along the spherical surface on the outer periphery of the ball 108, and both of them are metal-touched, as shown in FIG.
Is biased by disc springs 109 and 110 so as to sufficiently contact the ball 108.

A rotating shaft 111.1 serving as a center of rotation of the ball 108
12 are pressed and fixed to the ball 108 so as to be opposed to each other from above and below, and are supported by the housing 102. Housing 102 and housing
104 is screwed by bolt 113 and nut 114,
The ball 108 is supported by the seats 105 and 106,
Rotating around 112, the fluid flows through and shuts off the flow path 101 and the flow path 103.

The back of the seats 105 and 106 and the housing 102
As shown in FIG. 6, asbestos filler 11 in which asbestos and stainless steel thin plates are alternately laminated
5 is attached, the asbestos filler 115 has a large reaction force in a short stroke, seals the back of the sheets 105, 106, and makes the sheets 105, 106 abut the ball 108.

Although the base end of the rotating shaft 111 is press-fitted and fixed to the ball 108, the rotating shaft 111 is rotatably supported on the housing 102 with a stellite metal 116 interposed near the base end. Next, the gland packing 119 is interposed between the rotating shaft 111 and the housing 102, and is brought into contact with the rear end surface of the gland packing 119 with the holding cylinder 120, and the holding cylinder 120 is pressed with the holding plate 121, and A nut 123 is screwed onto the upright bolt 122 and tightened.

On the other hand, the base end of the rotating shaft 112 is press-fitted and fixed to the ball 108, and a stellite metal 124 is interposed between the ball and the housing 102 at the leading end so that the rotating shaft 112 can rotate. Cover the outer end of the rotating shaft 112 with the lid plate 125, and
Fix to the housing 102 with 6. The seal at the joint between housing 102 and housing 104 is body gasket 127
Do with.

[0008]

With the above-mentioned conventional high-temperature ball valve, fluid is allowed to flow through or shut off. Sheet
105, 106 Body gasket 127 for sealing between the back and housings 102, 104, rotating shaft 111 and housing 10
The gland packing 119, which seals between them, is made of a material such as graphite and asbestos.
Although it can cope with high temperatures of ℃ or more, the packing that seals between the sheets 105 and 106 and the housings 102 and 104 uses asbestos filler 115, but leakage occurs, and leakage is used. .

Sheets 105 and 106 and housings 102 and 104
Currently, an appropriate packing cannot be selected for sealing. When trying to seal from a low temperature to a high temperature with this high temperature ball valve, when the temperature becomes high, the housings 102 and 104, the seats 105 and 106, and the ball 108 adhere to each other due to the difference in expansion coefficient between metal and non-metal. However, at high temperatures, an increase in valve operating torque is inevitable.

[0010]

SUMMARY OF THE INVENTION In view of the above circumstances, in order to prevent leakage between the rear surface of the seat and the housing, the present invention fits a cylindrical seat to the housing on both sides of a ball penetrating the flow path. In a ball valve for high temperature, in which a ball is seated on a seat and flows or shuts off a high-temperature fluid, a disc spring is arranged on the rear end surface of the seat to urge the seat to contact the ball. A gland packing made of graphite and asbestos is externally fitted to the outer periphery of the sheet, a disc spring is arranged at the back of the gland packing, and the end face of the gland packing is pressed by a packing press screwed to the housing, and the sheet is pressed. A ball valve for high temperature was obtained by disposing a disc spring between the back surface of the housing and the housing.

[0011]

[Function] In the present invention, the packing is not installed, only the disc spring is arranged on the back of the seat, and the gland packing is externally fitted on the outer periphery of the sheet, and the sheet is urged by the disc spring as a measure against retightening. The leakage on the back side of the seat is eliminated, and even if the temperature becomes high, the difference in expansion between the ball seat and the housing is absorbed by the disc spring on the back of the seat, thereby preventing an increase in valve operating torque.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to a specific embodiment shown in the accompanying drawings. The housing 2 having the passage 1 penetrated therethrough is replaced with the housing 4 having the passage 3 penetrated therethrough.
Are made to face each other so that the flow path 1 and the flow path 3 communicate with each other, and sheets 5 and 6 are slidably fitted to the respective inner ends of the flow paths 1 and 3 so that the central portions of the sheets 5 and 6 are formed. A spherical ball 8 having a penetrating flow path 7 is sandwiched. The inner surfaces of the tips of the sheets 5 and 6 are formed along the spherical surface on the outer periphery of the ball 8 and both are metal-touched.

The rotating shafts 11 and 12 serving as the center of rotation of the ball 8 are pressed and fixed to the ball 8 while being opposed to each other from above and below, and the cylindrical bodies 31 and 32 are fixed.
To support. The cylinders 31 and 32 are located between the housing 2 and the housing 4 and are screwed by bolts 33 and 34 and nuts 35 and 36. The ball 8 is supported by the seats 5 and 6 and rotates around the rotation shafts 11 and 12 to allow the fluid to flow through and block the flow path 1 and the flow path 3.

As shown in FIG. 2, disc springs 41 and 42 are disposed between the back surfaces of the seats 5 and 6 and the housings 2 and 4, so that the seats 5 and 6 are constantly kept in the spherical outer periphery of the ball 8. Energize to abut the surface. As shown in FIG. 3, gland packings 45 and 46 made of graphite 43 and asbestos 44 are externally fitted on the outer peripheral surfaces of the sheets 5 and 6, and
-Disc springs 51 and 52 are arranged at the back of 46 to seal between the seats 5.6 and the housings 2.4. The gland packings 45 and 46 are brought into contact with the packing pressers 47 and 48 from the front end side, and bolts 49 and 50 are screwed and fixed.

Although the base end of the rotating shaft 11 is press-fitted and fixed to the ball 8, the rotating shaft 11 is rotatably supported on the cylindrical body 31 with a stellite metal 16 interposed near the base end. Next, the gland packing 19 is interposed between the rotating shaft 11 and the cylinder 31, the holding cylinder 20 is brought into contact with the gland packing 19, pressed by the holding plate 21, and the bolts 22 and nuts raised from the cylinder 31.
Screw 23 and tighten.

On the other hand, the base end of the rotating shaft 12 is press-fitted and fixed to the ball 8, and a stellite metal 24 is interposed between the ball 8 and the cylindrical body 32 at the distal end so that the rotating shaft 12 can rotate with respect to the cylindrical body 32. .
The outer end of the rotating shaft 12 is covered with a cover plate 25, and a cylindrical body 32 is
Fixed to. The connection between the housing 2 and the housing 4 is sealed with a body gasket 27.

Disc springs 41 and 42 are arranged on the back of the seats 5 and 6, and the difference in thermal expansion is absorbed by the disc springs 41 and 42 while securing the sealing surface pressure of the metal 8 between the ball 8 and the sheets 5.6. And In addition, graphite 43 and asbestos 44 are provided on the outer peripheral surface of the sheets 5.6 against leakage on the back side of the sheets 5.6.
The packings 45 and 46, which are formed by laminating the seals, are mounted, and the sealing surface pressure of the packing is ensured by disposing the disc springs 51 and 52 also against the heat loss of the packing.

[0018]

According to the present invention, as described above, a cylindrical sheet is disposed on both sides of a ball penetrating a flow passage so as to be fitted in a housing, and the ball is seated on the sheet to allow a high-temperature fluid to flow. In a high-temperature ball valve that opens and closes, a disc spring is arranged on the rear end surface of the seat to urge the seat to contact the ball, and the outer periphery of the seat is made of graphite and asbestos that can withstand the invention especially. The packing is externally fitted, a disc spring is arranged at the back of the gland packing, the end face of the gland packing is pressed by a packing press screwed to the housing, and a disc spring is arranged between the rear surface of the seat and the housing. Since the ball valve for high temperature is formed, a ball valve which does not leak from low temperature to high temperature can be provided. In particular, by disposing a disc spring at the back of the gland packing, the sealing surface pressure of the packing can be secured.

Further, according to the present invention, it is possible to obtain a ball valve in which the operating torque of the valve hardly changes from a low temperature to a high temperature.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a specific embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion II in FIG.

FIG. 3 is an enlarged sectional view of a part III in FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional high-temperature ball valve.

FIG. 5 is an enlarged sectional view of a portion V in FIG. 4;

FIG. 6 is an enlarged sectional view of a portion VI in FIG. 4;

[Explanation of symbols]

 7 ... Flow path 8 ... Ball 5.6 ... Sheet 41/42 ... Belleville spring 45/46 ... Gland packing 47/48 ... Packing presser

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Etsuko Tamura 4-97, Uedahigashi-cho, Nishinomiya City, Hyogo Prefecture Inside Konan Electric Machinery Co., Ltd. (72) Kumiko Tanaka 4-97, Uedahigashi-cho, Nishinomiya City, Hyogo Prefecture Konan Electric Machinery Incorporated company (56) References Japanese Utility Model Hei 1-140074 (JP, U) Japanese Utility Model Showa 52-170327 (JP, U) Japanese Utility Model 46-1759 (JP, Y1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16K 5/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A high-temperature ball valve for arranging cylindrical seats on both sides of a ball penetrating a flow passage so as to be externally fitted to a housing, seating the ball on the seat, and flowing or shutting off a high-temperature fluid. , A disc spring is arranged on the rear end face of the sheet to urge the sheet into contact with the ball, a gland packing made of graphite and asbestos is fitted around the outer periphery of the sheet, and a plate A high-temperature ball valve comprising a spring disposed, an end face of the gland packing pressed by a packing retainer screwed into the housing, and a disc spring disposed between the back surface of the seat and the housing.