Special device for grinding sealing surface of DUVE40H type low-pressure bypass valve

Abstract

The utility model discloses a special device for grinding a sealing surface of a DUVE40H type low-pressure bypass valve. When a sealing surface of a DUVE40H type low-pressure bypass valve selected by an existing 1000MW steam turbine generator unit is poor in contact condition, due to the fact that a sealing piece of the low-pressure bypass valve is high in material hardness and high in required flatness, the low-pressure bypass valve is mostly returned to a factory to be repaired after problems occur. The grinding head comprises a grinding end face (3) and a fixed end face (1), a threaded hole (6) is formed in the center of the grinding end face, and a valve rod (2) is in threaded connection with the threaded hole in the center of the grinding end face and then penetrates through a through hole (5) in the center of the fixed end face. The grinding device is used for grinding the sealing surface of the DUVE40H type low-pressure bypass valve.

Description

Technical Field

[0001] The utility model relates to a special device for grinding the sealing surface of a DUVE40H low-pressure bypass valve. Background Art

[0002] When the sealing surface contact of the DUVE40H low-pressure bypass valve used in the existing 1000MW steam turbine generator set is poor, most of the low-pressure bypass valve seals are returned to the factory for repair after problems occur, because the material hardness and flatness requirements are high. However, the return time is long, the process cannot be controlled, the maintenance time cannot be guaranteed, and the return cost is high, which is not economical. Utility Model Content

[0003] The utility model aims to solve the above-mentioned problems and provides a special device for grinding the sealing surface of a DUVE40H low-pressure bypass valve.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A special device for grinding the sealing surface of a DUVE40H type low-pressure bypass valve comprises a grinding end face and a fixed end face. A threaded hole is provided at the center of the grinding end face. A valve stem is threadedly connected to the threaded hole at the center of the grinding end face and then passes through a through hole at the center of the fixed end face.

[0006] The special device for grinding the sealing surface of the DUVE40H low-pressure bypass valve has a grinding end surface of a stepped disc structure.

[0007] The DUVE40H type low-pressure bypass valve sealing surface grinding special device, the fixed end surface is a stepped direction plate structure.

[0008] The DUVE40H low-pressure bypass valve sealing surface grinding device is characterized in that the end of the valve stem is threadedly connected with a fixing nut. Beneficial Effects

[0009] 1. The utility model has a modular design, adjustable size, convenient assembly and disassembly, and flexible assembly position. When repairing, you only need to stick grinding paper on the device, and then turn the special device to grind and repair the sealing surface. The operation is simple, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a three-dimensional diagram of the utility model;

[0011] Attached Figure 2 It is the front view of the utility model;

[0012] Attached Figure 3 It is the main view of the fixed end face;

[0013] Attached Figure 4 It is a top view of the fixed end face;

[0014] Attached Figure 5 It is the front view of the ground end face;

[0015] Attached Figure 6 It is a schematic diagram of the structure of the utility model when it is used;

[0016] In the figure: 1. Fixed end face; 2. Valve stem; 3. Ground end face; 4. Fixed nut; 5. Through hole; 6. Threaded hole; 7. Bypass valve; 8. Through hole; 9. Operating lever. DETAILED DESCRIPTION

[0017] Reference Figure 1-Figure 5 A DUVE40H type low-pressure bypass valve sealing surface grinding device, which comprises a grinding end face 3 and a fixed end face 1, the grinding end face is a stepped disc structure, a threaded hole 6 is provided in the center of the grinding end face, a valve stem 2 is threadedly connected with the threaded hole in the center of the grinding end face and then passes through the through hole 5 in the center of the fixed end face, the fixed end face is a stepped direction plate structure, the side surface of the fixed end face is an arc shape matching the end face step of the bypass valve, and a fixing nut 4 is threadedly connected to the end of the valve stem;

[0018] Working principle: When using, refer to Figure 6 First, the grinding end face is threadedly connected to the valve stem, and then the end of the valve stem is threadedly connected with a fixing nut, and the lower end face of the grinding end face is pasted with grinding paper to grind the sealing surface. The step structure of the grinding end face matches the step structure of the sealing surface of the bypass valve. After the handheld device drops the grinding end face on the sealing surface of the bypass valve, the fixed end face is inserted into the valve stem so that the fixed end face is stuck in the end face step of the bypass valve. This fixed end face has a limiting function, which can make the valve stem concentric when rotating. A through hole 8 is opened on the valve stem, and the through hole is a round hole. After the operating rod 9 is passed through the through hole, the valve stem is rotated by holding the operating rod with both hands, so that the grinding end face can grind the sealing surface of the bypass valve.

Claims

1. A special device for grinding the sealing surface of a DUVE40H low-pressure bypass valve, characterized by: The valve stem comprises a grinding end face and a fixed end face. A threaded hole is provided at the center of the grinding end face. The valve stem is threadedly connected with the threaded hole at the center of the grinding end face and then passes through the through hole at the center of the fixed end face.

2. The special device for grinding the sealing surface of the DUVE40H low-pressure bypass valve according to claim 1 is characterized in that: The grinding end surface is a stepped disc structure.

3. The special device for grinding the sealing surface of the DUVE40H low-pressure bypass valve according to claim 2 is characterized in that: The fixed end surface is a stepped direction plate structure.

4. The dedicated device for grinding the sealing surface of the DUVE40H low-pressure bypass valve according to claim 3 is characterized in that: The end of the valve stem is threadedly connected with a fixing nut.

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