Pratt large diameter butterfly valve seat sealing ring replacement method

A replacement method and sealing ring technology, which is applied in the direction of lifting valves, valve devices, connecting components, etc., can solve the problems of large-diameter butterfly valve equipment that cannot be repaired, and achieve the effect of saving equipment purchase funds

Active Publication Date: 2019-08-13
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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Problems solved by technology

[0007] The purpose of the present invention is to develop the valve seat sealing ring replacement technology for large-diameter PRATT butterfly valves, solve the problem that such large-diameter butterfly valve equipment in the third factory cannot be repaired in China, save spare parts procurement and on-site maintenance costs, and meet the needs of on-site work

Method used

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  • Pratt large diameter butterfly valve seat sealing ring replacement method
  • Pratt large diameter butterfly valve seat sealing ring replacement method

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] A method for replacing the sealing ring of a PRATT large-diameter butterfly valve seat, specifically comprising the following steps:

[0045] Step 1: Clean up the old valve seat

[0046] Step 1.1: Place the valve body 5 horizontally with one end of the sealing surface of the valve seat facing up, open the butterfly plate 2, and remove the old valve seat 1.

[0047] Step 1.2: Clean up waste glue and valve seat debris, keep the valve seat installation groove 8 clean, and avoid damaging the surface of the valve seat installation groove 8 during work.

[0048] Step 1.3: Drill two glue injection holes 7 for glue injection symmetrically on the plane of the valve body flange 6 and tap them.

[0049] Step 1.4: Grind the valve seat installation groove 8 with sandpaper, so that the surface layer of the inner wall of the groove exposes the substrate and s...

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Abstract

The invention belongs to the technical field of operating maintenance of power stations, particularly relates to a PRATT large-caliber butterfly valve seat seal ring replacement method and aims at researching and developing of the PRATT large-caliber butterfly valve seat seal ring replacement technology. By means of the PRATT large-caliber butterfly valve seat seal ring replacement method, the problem that this type of large-caliber butterfly valve equipment of Qinshan Third Nuclear Power Company Ltd. cannot be repaired is solved; the spare part purchasing and on-site repair cost is saved, andthe requirements for field work are met. The method is characterized by comprising the steps of cleaning an old valve seat, assembling a valve seat, conducting air testing before glue injection, conducting glue injection and conducting cleaning and checking. Since the PRATT butterfly valve seat seal ring maintenance and replacement technology is developed successfully, about 130 seawater system large-caliber butterfly valves are sequentially repaired successively in total, and the equipment purchase funds are saved by RMB 50 million or more.

Description

technical field [0001] The invention belongs to the technical field of power station operation and maintenance, and in particular relates to a method for replacing a valve seat sealing ring of a PRATT large-diameter butterfly valve. Background technique [0002] The large-diameter PRATT butterfly valves for the seawater system of Qin No. 3 Plant are manufactured by HENRY PRATT Company of the United States. The main sizes and specifications are 42″, 54″, 90″ and 108″. The total number of equipment for the two units is 72. Due to comprehensive factors such as system layout, valve structure design, on-site installation method, and the harsh seawater environment in the third phase, most of the large-diameter butterfly valve equipment on site failed prematurely, and the site needed to be repaired in time. [0003] Considering factors such as the on-site maintenance environment and equipment defect handling requirements, the site generally adopts direct replacement of the overall ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K1/226F16B11/00
CPCF16B11/006F16K1/2263
Inventor 吴奈勋郑立军陈宝成陈明军姜向平王欣张春东吴唯洁
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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