JPH112340A - High temperature slide valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a valve element sliding surface of a guide rail for a long time, by slidably supporting a valve element, which opens or closes a passage, on the guide rail placed on an end surface downstream of a seat ring, and by removably fixing hard facing guide pieces on a valve sliding surface of the guide rail. SOLUTION: A valve element 5 which opens or closes a passage is supported on the guide rail 4 placed on an end surface downstream of a seat ring 3, and is driven by a hydraulic cylinder. Recessed grooves 17a, 17b are formed on valve element sliding surfaces 4a, 4b of the guide rail 4 longitudinally of the guide rail 4. Guide pieces 18a, 18b with hard building up part 12 at their surface are removably engaged respectively with recessed grooves 17a, 17b. Each guide piece 18a, 18b has plural screw holes with a given interval longitudinally. By screwing bolts 21 into the holes, each guide piece 18a, 18b is fixed to the guide rail 4 replaceably.

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 flow path for flowing a high-temperature fluid including a powdery fluid such as a chemical catalyst in a petroleum refining facility.

[0002]

2. Description of the Related Art An example of this type of high temperature slide valve is shown in FIG.
4, the inlet 2a of the flow path 2 through which the high-temperature fluid including the powdered fluid in the valve box 1 flows is formed in a tapered shape, and a valve provided substantially in the center of the flow path 2 is provided. The seat 3 is formed by a cone member 3A having through holes 3a and 3b in the center and a seat ring 3B provided on the downstream end surface of the cone member 3A. The valve body 5 is slidably supported by a guide rail 4 provided on a downstream end surface of the seat ring 3B, and a valve body 5 is slid via a piston stem 6 by driving a hydraulic cylinder such as a hydraulic cylinder (not shown). Thus, the flow path 2 is opened (solid line state in FIG. 4) or closed (virtual line state in FIG. 4). In the drawing, reference numeral 8 denotes a heat-resistant material formed on the inner surface of the valve box 1, and 9 denotes a cone member 3A and the valve box 1.
And a connecting member 10 for integrally connecting the inflow port 2a and the valve seat 3
And a wear-resistant material lined at a portion of the valve body 5 where the high-temperature fluid is strongly applied. It is formed from a wearable lining material.

Conventionally, as shown in FIGS. 5 and 6, hardening overlays 12 and 13 are entirely applied to the sliding surfaces 4a and 4b of the valve body of the guide rail 4 and the outer peripheral surface of the valve body 5. . In addition, 14 is a fastening tool such as a bolt for fastening the seat ring 3B to the cone member 3A, and 15 is a fastening tool such as a bolt and nut for fastening the guide rail 4 to the seat ring 3B.

[0004]

In the above-mentioned conventional configuration,
Since the valve body sliding surfaces 4a and 4b of the guide rail 4 are bent inward in a substantially L-shape, the valve body sliding surfaces 4a and 4b
It is difficult to use a high-hardness material as the hardfacing material 12 to be applied to the surface, and the hardfacing material 12 is worn by the high-temperature fluid including the powder fluid flowing through the flow path 2 in a short period of time. The moving surfaces 4a and 4b are easily scratched by sliding. When the hardfacing 12 is worn, the guide rail 4 is removed and the hardfacing 12 is repaired by welding. However, when the welding repair is performed about twice, a large welding to the guide rail 4 is performed. Since the distortion occurs, the guide rail 4 cannot be used repeatedly.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a high-temperature slide valve that protects a sliding surface of a valve body of a guide rail for a long period of time and allows the guide rail to be used repeatedly. And

[0006]

In order to achieve the above-mentioned object, the present invention provides a valve seat provided at a substantially central portion of a flow path through which a high-temperature fluid including a powder fluid flows in a valve box. And a seat ring fixed to the downstream end surface of the cone member, and a valve body for opening and closing the flow path is slidable on a guide rail provided on the downstream end surface of the seat ring. In the supported high-temperature slide valve, a guide piece having a hardfacing overlay is detachably fixed to a valve body sliding surface of the guide rail.

In the above structure, when the hardfacing of the guide piece is worn by the high temperature fluid including the powder fluid flowing through the flow path, the guide rail is removed from the seat ring and the guide piece is removed from the guide rail. Then, after the hardfacing of the guide piece is repaired by welding, the guide piece and the guide rail may be attached in the reverse procedure.

In this case, the guide piece is detached from the guide rail, and the hardened overlay is applied to the guide piece. Since the shape of the guide piece is simple, a hard material is used as the hardened overlay. This makes it possible to reduce the abrasion of the hardfacing due to the high-temperature fluid including the powder fluid flowing through the flow path, and to protect the sliding surface of the guide rail on the valve body for a long time.

Further, when the hardfacing of the guide piece is worn, it is only necessary to remove the guide piece from the guide rail and repair the hardfacing by welding, and the welding repair causes a large welding distortion to the guide piece. When this occurs, only the guide piece needs to be replaced, which allows the guide rail to be used repeatedly, which is economical.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a main part of a high-temperature slide valve according to an embodiment of the present invention. The slide valve 4 has a sliding surface 4a, 4b of a guide rail 4 in the longitudinal direction of the guide rail 4. Grooves 17a, 17b are formed along the grooves, and the guide pieces 18a,
18b is removably fitted into each of the guide pieces 18
The hardfacing 12 is applied to the surfaces of a and 18b. Also, a plurality of screw holes 19 are formed at predetermined intervals along the longitudinal direction of each guide piece 18a, 18b, and a plurality of through holes 20 penetrate the guide rail 4 concentrically with each screw hole 19. The guide pieces 18a and 18b are fixed to the guide rails 4 by screwing the bolts 21 inserted into the through holes 20 into the screw holes 19. Note that the head 21a of each bolt 21 is
0, so as not to protrude from the guide rail 4 to the outside. The configuration other than the above is shown in FIG.
6 are substantially the same as those of the conventional example shown in FIG.

In the above configuration, the guide pieces 18a and 18b are heated by the high-temperature fluid including the powder fluid flowing through the flow path 2.
When the hardened overlay 12 is worn, the fastening by the fastening tool 15 is released, and the guide rail 4 is attached to the seat ring 3B.
, The fastening by the bolt 21 is released, the guide pieces 18a, 18b are removed from the guide rail 4, and the hardened overlay 12 of the guide pieces 18a, 18b is repaired by welding. The guide pieces 18a and 18b and the guide rail 4 may be attached in accordance with the procedure.

In this case, since the guide pieces 18a and 18b are formed in a rectangular shape and have a simple shape, a high-hardness material can be used as the hardened overlay 12, whereby the flow path 2 can be circulated. The wear of the hardfacing cladding 12 due to the high-temperature fluid containing the powder fluid can be reduced, and the valve body sliding surfaces 4a and 4b of the guide rail 4 can be protected for a long time.

When the hardfacing 12 of the guide pieces 18a, 18b is worn, the guide pieces 18a, 18b are worn.
a, 18b are removed from the guide rail 4 and the hardfacing 1
2 only needs to be welded and repaired. When a large welding distortion occurs in the guide pieces 18a and 18b due to the welding repair, only the guide pieces 18a and 18b need to be replaced, whereby the guide rail 4 is repeatedly used. It can be economical.

[0014]

According to the present invention, since the shape of the guide piece is simple, a high-hardness material can be used as the hardfacing applied to the guidepiece, thereby reducing abrasion of the hardfacing. By reducing the number, the sliding surface of the valve body of the guide rail can be protected for a long time.

Further, by repairing the hardfacing of the guide piece by welding, when a large welding distortion occurs in the guide piece, only the guide piece needs to be replaced, and the guide rail can be used repeatedly. Is economical.

[Brief description of the drawings]

FIG. 1 is a horizontal cross-sectional view (a cross-sectional line taken along line AA of FIG. 4) of a main part of a high-temperature slide valve according to an embodiment of the present invention.

FIG. 2 is a perspective view of the main part.

FIG. 3 is a vertical sectional view of a high-temperature slide valve.

FIG. 4 is a cross-sectional view of the same.

FIG. 5 is a horizontal sectional view of a main part showing a conventional example.

FIG. 6 is a perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Flow path 3 Valve seat 3A Cone member 3B Seat ring 3a Through hole of cone member 3b Through hole of seat ring 4 Guide rail 4a Valve body sliding surface 4b Valve body sliding surface 5 Valve body 12 Hardening 18a Guide piece 18b Guide piece 21 Bolt

Claims (1)

[Claims] 1. A cone member having a through hole formed in a substantially central portion of a flow path through which a high-temperature fluid including a powder fluid flows in a valve box, and a downstream end face of the cone member having a through hole in the central portion. A high-temperature slide valve formed of a fixed seat ring and a valve body for opening and closing the flow path, the valve body being slidably supported by a guide rail provided on a downstream end surface of the seat ring; A high-temperature slide valve characterized in that a guide piece having a hardfacing on its sliding surface is detachably fastened.