JP2000035140A - Slide valve for high temperature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain stable controllability regardless of opening by maintaining an opening shape of a port in a similar figure regardless of opening of a valve element and to restrain abrasion of a guide rail by preventing channeling. SOLUTION: A seat ring forming a port is arranged in the inside of a valve box, a valve element 5 to open and close the port is supported on the downstream side of the seat ring free to slide along the seat ring by a guide rail 4a, a cutout shape opening part 51 free to totally open the port is formed on a head end part of the valve element 5, both side parts of the valve body 5 along the opening part 51 are formed on a protective cover part 52 to cover the guide rail, and a deep end edge 53 of the opening part 51 is made in a shape to correspond with the port.

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 for controlling a high-temperature fluid containing a powdery fluid such as a chemical catalyst in a petroleum refining facility.

[0002]

2. Description of the Related Art A slide valve for a high temperature of this type is, for example, as shown in FIGS. In FIG. 4, an inlet 2a of a flow path 2 for flowing a high-temperature fluid including a powder fluid is formed in a tapered shape in a valve box 1, and a valve seat 3 is a cone member having ports 3a and 3b provided in the center thereof. 3A and a seat ring 3B provided on the downstream end surface of the cone member 3A. A valve element 5 that opens and closes the flow path 2 includes a pair of upper and lower guide rails 4 provided on the downstream end surface of the seat ring 3B.
a and 4b are slidably supported in the horizontal direction. By driving a hydraulic cylinder such as a hydraulic cylinder (not shown), the hydraulic cylinder slides horizontally through the piston stem 6 and opens or closes the flow path 2. I do. In the drawing, 8 is a heat-resistant material formed on the inner surface of the valve box 1, 9 is a connecting member for integrally connecting the cone member 3A and the valve box 1, and 10 is an inlet 2a, a valve seat 3 and a valve. A wear-resistant material lined to a portion of the body 5 to which the high-temperature fluid is strongly applied, which is made of a mesh-shaped stainless steel material having a large number of hexagonal holes, and a wear-resistant lining material filled in the mesh of the hexagonal steel. And formed from.

[0003]

In the above-mentioned conventional construction, the valve element 5 has a straight tip, and the ports 3a and 3b have a semicircular tip corresponding to the tip of the valve. . For this reason, port 3 at small opening
The opening shapes of a and 3b are arc-shaped, and the rate of change of the opening area is not constant, so that the controllability for performing a minute flow rate adjustment is poor. In the small opening, the opening positions of the ports 3a and 3b are shifted from the center of the flow path 2, and the opening shape of the ports 3a and 3b is changed from a shape combining a rectangle and a semicircle at a large opening to a semicircular shape. , The fluid drifts downstream of the valve body 5, and the guide rails 4a and 4b are exposed to the fluid and wear, resulting in a reduction in the life of components.

The present invention solves the above-mentioned problem, and maintains stable controllability irrespective of the opening degree by maintaining the port opening shape similar regardless of the opening degree of the valve element. It is an object of the present invention to provide a high-temperature slide valve capable of preventing a drift and suppressing abrasion of a guide rail.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a high temperature slide valve according to the present invention according to claim 1 is provided.
A high-temperature slide valve in which a seat ring forming a port is disposed in a valve box and a valve body for opening and closing the port is slidably supported by a guide rail along the seat ring on a downstream side of the seat ring. A notch-shaped opening capable of fully opening a port is formed in the portion, and both side portions of the valve body along the opening are formed in a protective cover portion covering the guide rail.

[0006] With the above arrangement, the rear edge of the opening overlaps with the port as the closing operation of the valve body proceeds, and the center of the opening of the port becomes the center of the flow path as the area of the opening in the port decreases. Going out of the way. However, on the valve body side, there is always a port opening portion adjacent to the rear end edge of the opening portion, and the protective cover always covers the guide rail in a certain range including the port opening portion in the sliding direction of the valve body. Therefore, even if the drift occurs due to the eccentricity of the port opening, the guide rail is not exposed to the fluid, and the wear of the guide rail can be prevented.

According to a second aspect of the present invention, there is provided a slide valve for high temperature, wherein a seat ring forming a port is disposed in a valve box;
In a high-temperature slide valve that supports a valve body that opens and closes a port on the downstream side of the seat ring by a guide rail so as to be slidable along the seat ring, the port is formed in a rectangular shape, and one diagonal line of the rectangle is a sliding direction of the valve body. And a notch-shaped opening capable of fully opening the port is formed at the distal end of the valve body, and the shape of the opening is formed along the shape of the port.

[0008] With the above structure, the rear edge of the opening overlaps with the port as the closing operation of the valve body progresses, and the center of the opening of the port becomes the center of the flow path with the decrease in the area of the opening in the port. Going out of the way. However, on the valve body side, there is always an opening portion of the port adjacent to the inner edge of the opening portion, and the opening portion of the port is formed by the opening edge of the valve body and the opening edge of the port that are opposed in the sliding direction of the valve body. Since the opening is formed and the shape of the opening of the valve body follows the shape of the port, the opening of the port is reduced while maintaining a similar relationship to the original rectangle. Therefore, the controllability of the fluid amount by opening and closing of the valve element becomes stable regardless of the valve element opening degree.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Members performing the same operations as those described above with reference to FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof is omitted. 1 to 3 show a main part of a high-temperature slide valve according to an embodiment of the present invention.

1 to 3, a rectangular port 31 is formed in a seat ring 3B constituting a valve seat 3.
The seat ring 3B is arranged such that one diagonal line of the port 31 is along the sliding direction of the valve body.

The valve element 5 has a notch-shaped opening 51 at the tip end. The opening 51 is formed so that the port 31 can be fully opened, and both sides of the valve element 5 along the opening 51 are formed. It is formed on a protective cover portion 52 that covers the guide rails 4a and 4b, and the rear end edge 53 of the opening portion 51 is formed in a triangular shape along the opening edge shape of the port 31.

With the above-described configuration, the rear end edge 53 of the opening 51 overlaps the port 31 as the closing operation of the valve body 5 proceeds. As the area of the opening A in the port 31 decreases, the center of the opening A of the port 31 shifts from the center of the flow path 2.

However, on the valve element 5 side, the opening portion A of the port 31 is always adjacent to the rear end edge 53 of the opening portion 51.
Is present, and the guide rails 4a and 4b in the fixed range area L including the opening A of the port 31 in the sliding direction of the valve element 5 can be always covered with the protective cover 52.

Therefore, even if the drift occurs due to the eccentricity of the opening A of the port 31, the guide rails 4a and 4b are not exposed to the fluid, and the wear of the guide rails 4a and 4b can be prevented.

The opening portion A of the port 31 is formed by the back edge 53 of the valve element 5 and the opening edge 31a of the port 31 which are opposed to each other in the sliding direction of the valve element 5. For this reason, the opening portion A of the port 31 is reduced while maintaining a similar relationship with the original rectangle. Therefore, the controllability of the fluid amount by opening and closing the valve element 5 becomes stable irrespective of the valve element opening degree.

[0016]

As described above, according to the present invention, when the valve body is closed, the opening portion of the port is always present adjacent to the inner edge of the opening portion of the valve body, and the opening of the port is opened. Since the protective cover covers the guide rail in a certain range including the region, even if drift occurs, the guide rail is not exposed to the fluid, and wear of the guide rail can be prevented. Further, since the opening of the valve body is formed in a shape along the port shape, the opening portion of the port formed by the opening edge of the valve body and the opening edge of the port is reduced while maintaining a similar relationship to the original rectangle, The controllability becomes stable regardless of the valve opening.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a high-temperature slide valve according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a shape of the valve body.

FIG. 3 is a schematic view showing the shape of the seat ring.

FIG. 4 is a cross-sectional view showing a conventional high-temperature slide valve.

FIG. 5 is a sectional view showing a main part of the slide valve for high temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Flow path 3 Valve seat 3B Seat ring 31 Port 31a Opening edge 31a 4a Lower guide rail 4b Upper guide rail 5 Valve body 51 Opening 52 Protective cover 53 Back end A Opening

Claims (2)

[Claims] 1. A high-temperature slide valve in which a seat ring forming a port is disposed in a valve box, and a valve body for opening and closing the port is provided downstream of the seat ring so as to be slidable along the seat ring by a guide rail. A notch-shaped opening capable of fully opening a port is formed at the tip of the valve body, and both side portions of the valve body along the opening are formed in protective cover portions covering the guide rails, for high temperature use. Slide valve. 2. A high-temperature slide valve in which a seat ring forming a port is disposed in a valve box, and a valve body for opening and closing the port is provided downstream of the seat ring so as to be slidable along the seat ring by a guide rail. The port is formed in a rectangular shape, and one diagonal of the rectangle is formed along the sliding direction of the valve body, and a notch-shaped opening capable of fully opening the port is formed at the tip of the valve body, and the opening of the opening is formed. A high-temperature slide valve characterized in that the shape is formed along the shape of a port.