3 replies to this topic

[ayan_dg]

What are the advantages of " Pilot Operated Safety Relief valve" over normal " Safety relief valve" ? Are there any disadvantages of POSRV ?

[Doggert]

Here is a good description of the differences in safety valve types:

http://www.spiraxsar...afety-valve.asp

[Zauberberg]

Here is another good reference, Crosby's PSV engineering handbook:

http://www.tycoflowc...OMC-0296-US.pdf

Regards,

[JoeWong]

What are the advantages of " Pilot Operated Safety Relief valve" over normal " Safety relief valve" ? Are there any disadvantages of POSRV ?

Advantages

• Relieving pressure not affected by backpressure
• Can operate at up to 98% of set pressure
• Less susceptible to chatter (some models)

Please also read " Why use a pilot valve ? "

Disadvantages

• Pilot is susceptible to plugging
• Limited chemical and high temperature use by “O-ring” seals
• Vapor condensation and liquid accumulation above the piston may cause problems
• Potential for back flow

Another comprehensive comparison...Advantages and Limitations of Valve Types - Valve Type Comparison