Why must ball valves be used for the drain ports and emptying ports on vacuum pipelines?
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I see what it says in the specification. I don’t know what the special considerations are for using a ball valve. Thank you.
Generally, the emptying and draining valve is relatively small, and the smaller ball valve opens and closes quickly!
Which standard stipulates this? It is still required by the unified design requirements of the project, and the difference between the two is quite large.
1# lyls uses ball valve, first: The switch is fast and can perform quick opening and closing. second: When fully open, the ball valve is equivalent to a pipe and can minimize resistance during discharge. third: Ball valve can discharge media with impurities
3# GHJDSM HG 20559-93 Pipeline Instrument Flowchart Design Regulations is written in the vacuum pump chapter: I don’t understand why ball valves are used for vacuum pipeline exhaust valves and purge valves.
You made it up yourself, right? Is there any regulation that says so? However, the quick opening and closing of the ball valve is a big advantage.
Shouldn't a vacuum valve be used on the vacuum pipeline? Such as vacuum gate valve, vacuum stop valve
There should be no such regulations. I think gate valves can be used as valves for emptying and purging.
HG 20559-1993 Design regulations for pipeline instrument flow diagrams 2.0.2.1 The cut-off valves of the vacuum pipeline use ball valves, gate valves and vacuum butterfly valves. Those that need to be adjusted use stop valves. The exhaust valves and purge valves are ball valves.
Mainly consider the speed of opening and closing and the operating space
What you are talking about is not in the main text of HG20599, but in the appendix of HG20599, the vacuum pump basic unit mode. In fact, the reason why you should choose a ball valve is very simple. The main problem is sealing. Compared with stop valves and gate valves, the sealing performance of ball valves is better. Ball valves can easily reach level 6, while stop valves and gate valves cannot reach level 6 unless they have soft seals.