[MW:545] Re: Hydrotesting of Bellow Seal Valves

Shwani,

Hydrotest of bellow seal valve is carried out with bellows installed. The manufacturer do the low pressure air testing internally to ensure the welds in bellows are free from any leakage. Then the hydrotest of complete body including bellows will be undertaken. The valve is kept open and the bellows will be subject to external pressure.

When conducting the seat closure test the bellow will not see the pressure.
 

Best Regards,

Sanjay Gandhi

desaid@toyoindia.com Sent by: materials-welding@googlegroups.com 31/01/2008 12:29 PM Please respond to materials-welding@googlegroups.com

To piping_valves@yahoogroups.com cc materials-welding@googlegroups.com Subject [MW:542] Hydrotesting of Bellow Seal Valves

Dears,

Can any one inform how testing (hydro & pneumatic) of Bellow seal valves are generally carried out? Shell Test & seat test both.
i.e. with bellows or without bellows?

If there is some detailed procedure available of reputed vendor then pls. send.

Thanks & Regards,
Dhwani Desai.

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