Which one is more vacuum-resistant, the fluoroplastic butterfly valve of F4 or that of F46? Urgent!
Thread Content
Hello, experts: The company needs to install a DN400 flanged butterfly valve in the reactor as a bottom discharge valve (initially, a knife valve was considered, but it doesn’t have a fluorine-lined interior). When feeding material into the reactor, a vacuum of up to -0.08 MPa can occur. I would like to ask now whether the fluorine-lined bottom valve should be made of F46 or F4 – which one can withstand the conditions? The valve manufacturers provide different ones; thank you! ! !
There is not much difference between PTFE-lined and FEP-lined valves in terms of vacuum performance; PTFE-lined valves have slightly better characteristics. Valve manufacturers that require resistance to vacuum conditions (even low levels of vacuum) will implement certain structural optimizations to counteract the suction forces associated with vacuum.
Materials lined with PTFE generally cannot be used in vacuum reaction vessels; if the acidic substances are very strong, Hastelloy C series materials can be chosen
Are your pipe sizes DN400 and 600? The client is a chemical plant in Nanjing; I can tell you that no anti-corrosion butterfly valve of any kind can function in a vacuum environment. Because someone asked me about it these past two days.
No anti-corrosion butterfly valve can function in a vacuum environment
Well, I’m in charge of procurement; I’m not very familiar with the manufacturing processes. The reaction vessel uses vacuum feeding, so the negative pressure condition doesn’t last for long.
Talk to your company’s technician, understand the operating conditions first, and then make a decision
It’s not a matter of whether they can withstand vacuum conditions; fluorinated-lined valves cannot be used in vacuum systems
Vacuum cannot use fluorinated lining materials! There is a dedicated page at http://www.jdfam.com/html/product/diefa*lei/230.html! You can take this as a reference!
But our logistics products are corrosive and acidic; stainless steel is not suitable for them.
What material is your pipeline made of? Basically, a choice is available; it can’t possibly be lined with fluoropolymer, right?