Can the factory repair valves on its own? The valve after repair does not have a supervision certificate; is it illegal to use it?

Is this the valve disc of a globe valve? How can it look more like a gate valve?

It seems there’s no such term; it’s only applicable to safety valves.

This post was last edited by Shutong on 2021-12-26 at 14:23. Let me say this: the maintenance requirements for pressure-rated valves are very strict; you can’t just do things however you want! 1. In accordance with the requirements for pipeline valves specified in API 6D, edition 2014, version 23, manufacturing must be carried out in line with pressure resistance requirements; welding procedures need to be certified, welders must possess the required qualifications, heat treatment is necessary after welding, and all such qualifications must be documented in the welding procedure qualification documents. Of course, this standard is recommended for use in China. In my opinion, such requirements from API are very strict, especially regarding the sealing surfaces. ! For the repairs involved with the 65-year-old unit, if there is welding required on the sealing surfaces, section 7.2 still applies, and non-destructive testing must be carried out; in addition, the welders must have the necessary certifications. 2. TSG DB001-2008 Code for Safety Supervision of Pressure Pipeline Valves: Components that require patch welding are treated in accordance with the requirements for pressure-bearing components, and personnel must hold relevant certificates to carry out such work. Look at clause 4: The design, manufacturing, inspection, testing, installation, use, maintenance, and repair of valves shall all comply with the provisions of these regulations. 3. Other maintenance tasks such as grinding and cleaning, as well as other auxiliary work, should be carried out carefully as long as the results are satisfactory.

We have experience in repairing gate valve sealing surfaces, and have repaired the sealing surfaces of high-pressure main steam valves and stop valves for various power plants

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It depends on what kind of valve it is; ordinary valves are fine, but those used in environments with toxic or harmful substances, as well as high-pressure valves, seem not to be suitable

We have a dedicated department for repairing valves

Senior, I hope this reply can clear everyone’s doubts.

For safety reasons, it is not recommended to repair high-pressure valves; it is better to replace them with new ones, as this provides a greater level of safety