JP2002228018A - Plug structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug structure without need to be repaired for a long time. SOLUTION: In a plug valve having a valve seat part 2 formed a port and a plug 11 getting in/out in the axial center direction of the port for abutting on/detaching from the valve seat part 2, abrasion proof linings 10, 14 are placed on the whole face of the plug 11 for improving durability of the plug.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plug structure,
For example, the present invention relates to a technology of a plug valve provided in a flow path through which a high-temperature fluid including a powder fluid such as a chemical catalyst flows.

[0002]

2. Description of the Related Art Conventionally, there is a plug valve of this type shown in FIGS. The plug valve has a valve seat 2 disposed inside the casing 1 and a plug 3 disposed opposite the valve seat 2, wherein the valve seat 2 forms a port and the plug 3 is a valve. The port area is adjusted by moving back and forth in the axial direction of the seat 2.

[0005] The plug 3 has a cylindrical portion 5 inserted into the plug body 4, and an opening 6 communicating with a flow path of the cylindrical portion 5.
have. The tubular portion 5 is opened at the base end side inside the plug body 4, and a rod 7 is connected to the base end. The rod 7 is connected to a cylinder device 8 arranged outside the plug body 4. The plug body 4 is provided with a carrier gas supply port 9.

[0004] The plug 3 is provided with a wear-resistant lining 10 on its periphery, a stellite ferrule 11 is provided at its tip, and the valve seat 2 is provided with a wear-resistant lining 12 on its inner and outer surfaces. In the above-described configuration, the carrier gas supplied into the plug body 4 from the supply port 9 is ejected from the opening 6 of the plug 3 toward the port of the valve seat 2 through the cylindrical portion 5, and
Into the port with the catalyst around.

To control the amount of catalyst, the plug 3 is moved in and out of the plug 3 by the cylinder device 8 through the rod 7, and the plug 3 and the valve seat 2 are moved.
The plug 3 is brought into contact with the valve seat 2 and is fully closed.

[0006]

The plug 3 is provided with an abrasion-resistant lining 10 around the exposed portion of the catalyst, and a stellite ferrule 11 at the tip. However, although the stellite metal 11 has no problem in operation for about two years, it is necessary to perform radical repair every two years. Since this repair work requires time and date, it is a factor that hinders efficient operation of an oil refinery plant or the like.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a plug structure which does not require repair for a long time.

[0008]

In order to solve the above-mentioned problems, a plug structure according to the present invention comprises a valve seat forming a port,
In a plug valve having a plug which retreats in the axial direction of a port and comes into contact with and separates from a valve seat portion, the entire surface of the plug is provided with a wear-resistant lining.

With the above structure, the durability of the plug is improved by providing a wear-resistant lining on the entire surface of the plug that comes into contact with the controlled object such as the catalyst.

[0010]

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. 2 to 4 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, a plug 13 has a conical structure 14 disposed at the tip of a cylindrical portion 5 forming a flow path of a carrier gas. A wear-resistant lining 15 is provided over the entire surface.

With the above construction, the plug 13 abuts on the wear-resistant lining 12 of the valve seat 2 at the surrounding wear-resistant lining 15 and is fully closed, and the cylinder device 8 projects the plug 13 through the rod 7. Then, the opening is adjusted by adjusting the distance between the plug 13 and the valve seat 2.

The carrier gas supplied from the supply port 9 to the inside of the plug body 4 passes through the cylindrical portion 5 and passes through the opening 6 of the plug 13.
From the valve seat 2 toward the port and flows into the port with the catalyst around the valve seat 2.

At this time, the durability of the plug 13 is improved by providing the wear-resistant lining 15 on the entire surface of the plug 13 with which the catalyst to be controlled comes into contact.

[0015]

As described above, according to the present invention, the durability of a plug that comes into contact with a controlled object such as a catalyst is improved by providing a wear-resistant lining on the entire surface of the plug, and it is necessary to repair the plug for a long time. Therefore, it is possible to contribute to improvement of operation efficiency of a plant or the like.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing a plug valve according to an embodiment of the present invention.

FIG. 2 is a front view showing a conventional plug valve.

FIG. 3 is a sectional view showing the operation of the plug valve.

FIG. 4 is an enlarged view of a main part showing the plug valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Valve seat part 4 Plug body 5 Cylindrical part 6 Opening 7 Rod 8 Cylinder device 9 Supply port 11 Stellite metallization 12,15 Abrasion resistant lining 13 Plug 14 Structure

Claims (1)

[Claims] 1. A plug valve having a valve seat portion forming a port and a plug which retreats and retreats in the axial direction of the port and comes into contact with and separates from the valve seat portion. Plug structure characterized by doing.