JPH11173459A - Slide valve for high temperature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide valve for high temperatures capable of coping with the thermal difference between a valve casing and each internal part. SOLUTION: In a slide valve for high temperatures where a heat insulating member is provided in the inner surface of a valve casing 21, a slide valve body 23 is advanced/retreated along the seat surface of a valve seat 22, a feeding passage for purge gas 27 is provided in the inside of the valve seat 22, and concurrently, a curved part 29a in a U-shape which has a spouting hole communicated with the feeding passage in the seat surface of the valve seat 22 while its tip end side is connected with the feeding passage and concurrently, has its base end side positioned at the outside part of the valve casing 21, the provision of the curved part 29a in a U-shape in an area located in the inside of the valve casing 21 thereby allows load due to the difference in thermal expansion to be appropriately absorbed by letting the curved part 29a of a tubing 29 in a U-shape be elastically deformed, and the elastic deformation can cope with load in the whole of three dimensional directions applied to the tubing 29 in a U-shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature slide valve interposed in a pipeline through which a high-temperature fluid containing a granular material such as a catalyst flows.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in a high-temperature slide valve 1 interposed in a pipeline through which a high-temperature fluid flows, a slide valve element 4 is provided downstream of a valve seat 3 in a valve box 2. The valve rod 5 is connected to the slide valve element 4. The bonnet portion 2a of the valve box 2 is formed on the base end side of the slide valve element 4 in the sliding direction.
The opening a is closed by a bonnet cover 6 which holds the valve stem 5 so as to be able to move back and forth. The valve stem 5 slides along the guide rail 7 by driving the operating device (not shown) to move in and out, thereby controlling the flow rate of the high-temperature fluid.

A supply path 3 for a purge gas 8 is provided in a valve seat 3 corresponding to a base end side of the slide valve element 4 in the sliding direction.
a, and a plurality of ejection ports for ejecting the purge gas 8 are formed on the bottom surface of the valve seat 3 facing the slide valve element 4. A straight pipe 10 is connected to the supply path 3a via a joint 9, and a ground portion 6a for holding the straight pipe 10 is provided on the outer wall of the bonnet cover 6.
Is provided.

[0004] The purge gas 8 is blown out from the jet port through the straight pipe 10 and the supply passage 3a, flows out into the valve box 2 through the gap between the slide valve body 4 and the valve seat 3, and flows out of the valve seat 3 A powder fluid such as a catalyst is prevented from entering between the slide valve body 4 and the slide valve body 4.

[0005]

In the above-mentioned conventional structure, the high temperature slide valve 1 has a valve box 2 of a hot shell type, and the valve box 2 and internal parts are formed of the same material. No difference in thermal expansion occurs between the valve box 2 and the internal components. As a result, the internal components can be used without any problem without receiving the load caused by the difference in thermal expansion.

However, when a heat insulating member is provided on the inner surface of the valve box, a difference in thermal expansion occurs between the valve box and the internal parts, and when a load is applied to the internal parts due to the difference in thermal expansion, As a result, there is a problem that the straight pipe may be damaged or the purge gas may leak.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-temperature slide valve which can be adapted to a difference in thermal expansion between a valve box and internal components.

[0008]

In order to achieve the above-mentioned object, a high temperature slide valve according to the present invention has a heat insulating member on the inner surface of a valve box, and a valve element extends along a seat surface of a valve seat. Retreat,
A purge gas supply passage is provided inside the valve seat, and a discharge port communicating with the supply passage is provided on the seat surface of the valve seat. A distal end is connected to the supply passage, and a base end is located outside the valve box. In the high-temperature slide valve having the purge gas supply pipe located therein, the purge gas supply pipe has a U-shaped curved portion at a position located in the valve box.

With the above-described structure, when a high-temperature fluid flows through the valve box, a difference in thermal expansion occurs between the valve box and the valve seat. When a load is applied to the purge gas supply pipe due to the difference in thermal expansion, The purge gas supply pipe absorbs the load by appropriately elastically deforming the curved portion according to the difference in thermal expansion. This elastic deformation occurs in a form such as expansion, narrowing, or twisting of the curved portion, and can cope with all loads in the three-dimensional direction applied to the purge gas supply pipe.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-temperature slide valve according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the high temperature slide valve 20 is a so-called cold shell type in which a heat insulating member is provided on the inner surface of a valve box 21, and is located downstream of a valve seat 22 in the valve box 21. The slide valve body 23 is disposed at the bottom. A valve stem 24 is connected to the slide valve element 23, and a bonnet part 21 of the valve box 21 is provided at a base end side of the slide valve element 23 in the sliding direction.
a. The opening of the bonnet part 21a is the valve stem 2
4 is closed by a bonnet cover 25 that holds the door 4 so that it can freely move in and out. The valve stem 24 is driven by an operating device (not shown) so that the slide valve element 23 is moved in and out of the guide rail 2.
Slide along 6, thereby controlling the flow rate of the hot fluid.

A supply path 22a for a purge gas 27 is formed inside the valve seat 22 corresponding to the base end side of the slide valve body 23 in the sliding direction, and the bottom surface of the valve seat 22 facing the slide valve body 23 is formed. A plurality of ejection ports 22b for ejecting the purge gas 27 are formed.

A U-shaped tubing 29, which is a purge gas supply pipe, is connected to the supply path 22a through a joint 28. A ground portion 25a for holding the U-shaped tubing 29 is provided on the outer wall of the bonnet cover 25. doing.
Further, the U-shaped tubing 29 has a U-shaped curved portion 29 a at a position located in the valve box 21, and the curved portion 2
9a is appropriately elastically deformed according to the difference in thermal expansion.

According to the above configuration, the purge gas 27 is blown out from the jet port 22b through the U-shaped tubing 29 and the supply path 22a, and then into the valve box 21 through the gap between the slide valve body 23 and the valve seat 22. Spilled toward the valve seat 2
A powder fluid such as a catalyst is prevented from entering between the slide valve body 2 and the slide valve body 23.

When a high-temperature fluid flows through the valve box 21, a difference in thermal expansion occurs between the valve box 21 and the valve seat 22, and the U-shaped tubing 29 is caused by the difference in thermal expansion.
Load. However, U-shaped tubing 29
Absorbs the load by appropriately elastically deforming the curved portion 29a according to the difference in thermal expansion. The elastic deformation of the curved portion 29a occurs in a form such as expansion, narrowing, or twisting of the curved portion 29a, and can cope with all loads applied to the U-shaped tubing 29 in the three-dimensional direction.

As described above, the load caused by the difference in thermal expansion between the valve box 21 and the internal components is absorbed by the curved portion 29a of the U-shaped tubing 29 being appropriately elastically deformed. The slide valve 20 can be adapted to thermal expansion even in a cold shell type without causing the leakage of the purge gas 27 or the breakage of parts.

[0017]

As described above, according to the present invention, the load caused by the difference in thermal expansion is absorbed by the curved portion of the purge gas supply pipe being appropriately elastically deformed. Since it is possible to cope with all loads in the three-dimensional direction applied to the pipe, it is possible to adapt to the difference in thermal expansion between the valve box and the internal parts.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a horizontal sectional view of a main part of a high-temperature slide valve.

FIG. 2 is a schematic view showing a cross section of a valve seat and a valve element of the high-temperature slide valve.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a horizontal sectional view of a main part of a conventional high-temperature slide valve.

[Explanation of symbols]

 Reference Signs List 20 High temperature slide valve 21 Valve box 22 Valve seat 22a Supply path 22b Spout port 23 Slide valve body 27 Purge gas 29 U-shaped tubing 29a Curved portion

Claims (1)

[Claims] An insulated member is provided on an inner surface of a valve box, and a valve body extends and retreats along a seat surface of a valve seat. The valve body has a purge gas supply passage inside the valve seat. A high-temperature slide valve having a jet port communicating with the supply path, a distal end connected to the supply path, and a purge gas supply pipe having a base end located outside the valve box, wherein the purge gas supply pipe is a valve. A high temperature slide valve having a U-shaped curved portion in a portion located in a box.