Check Valves suitable for full Vaccum Condition

[Kaleem1013]

I am using Stock Check valves of size : 3/4" Socket Weld 800# of make BFE SpA, Italy.

The client has specified that valves shall be suitable for full vaccume condition. Can someone explain what does this mean.

I have checked the catalogue of BFE. It says " BFE valves can be used with standard design in "Medium Vacuum" range (up to 0.001 Torr)."


Thanks

 

[hsbcn]

Do you mean a stop check valve (where you can close the manually, even if the disc is forced open by the medium?)

High-alloy valves for corrosive petrochemical applications.

 

[Kaleem1013]

Hi hsdcn . Thanks for replying.

I meant the valves which were in stock in BFE. Not manufactured specially for any project.

The valve is a piston type, reduced bore, socket weld check valve , A182 F316L body , piston disc stellited. Tested as per API 598.
I need to confirm to my client if these are "suitable for full vaccume condition".

 

[gerhardl]

Hello Kaleem1013,

See my comment on vacuum in thread408-327392.

Get your customer to exactly specify the 'vacuum' conditions, which is meaningless technically and comercially without any limitations. Then you can start checking if your valve is OK. What about references from producer for the application? (Customer to specify again, if not already givien).

Best luck!

 

[LittleInch]

My take on this is that unless you know you are dealing with very low vacuum pressures, what people normally mean is that if you have any seals to the outside that you can't get air entering in the event of a pressure less than 1 bara.

Chevron seals which work well on positive pressure are a particular issue, but normally this is a line on the data sheet and vendors say if they comply or not.

Only you know your process conditions, but gerhardls post reference tells you lots about what to look for in very low vacuum conditions.

IMO these valves look ok.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way