What are the differences in the applications of blind plates compared to valves?
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Now a blind flange is being installed on the branch pipe. I saw on the forum that valves are installed at both ends of the 8-shaped blind flange; so does installing such a blind flange still serve any purpose? I saw some people say they were worried about leaks inside the valves; so should we just use two valves, without blind plates? Beginners, please be patient and answer our questions! ! Thank you! !
Blind plates serve a purpose of isolation; valves cannot replace them, and no matter how many are installed, it still won’t work
Thank you! The boss wants to save money, so he wants to install a blind flange directly on the branch pipe without using valves. But I’ve seen many responses saying that valves must be installed at both ends; so it seems the boss’s idea of avoiding valves won’t work after all ‘:D’
Just add a valve and then a blind flange
Blind plates can securely isolate materials, while valves may leak internally.
Firstly, no matter how good a valve is, over time (due to factors such as medium corrosion and component aging), internal leakage can occur. Therefore, to achieve better and safer isolation, blind flanges of the appropriate specifications must be used. Why are blind flanges installed between two valves? That is because it facilitates operations better when the device needs to be shut down for purging or when there are leaks in the pipelines that require welding work. Generally, an additional drain valve is installed between the two valves, so that a blind flange can be used for isolation without the need to completely drain the medium from the pipeline