Negative pressure issues with valves and gaskets
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This post was last edited by chinaecec on 2011-9-7 12:57. What special considerations are needed when selecting valves? Will a bellows seal be used? Also, can metal wound gaskets be used as shims?
Yes, if positive pressure can be sealed off, then negative pressure can also be sealed off. Absolute vacuum is only 0.1 MPa, right?
Reply 1# chinaecec Under what operating conditions is the negative pressure? During the hydrogenation of oxalate esters?
Reply 1# chinaecec: Negative pressure leaks are more dangerous than positive pressure leaks; it is essential to ensure airtightness when operating under negative pressure.
Hehe, it seems Donghua has taken some concrete actions now
Hehe, it seems Donghua has taken some concrete actions now
What are the operating conditions for negative pressure and vacuum in the original poster’s setup? I’ve only heard of using negative pressure conditions; I’ve never heard of a completely vacuum environment. There are no issues with the sealing provided by metal wound gaskets; there are valves designed for negative pressure operation, and they differ from ordinary valves in terms of design.