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Equalization system - 3 valves vs. 2 valves

Thread starter engmat2007
Start date Oct 11, 2007

Status: Not open for further replies.

Oct 11, 2007

engmat2007

Mechanical

Hi everyone.

In our standards we specified that gate valves (2" to 24") in steam service shall have an external 3 valve bonnet relief/equalization system. We got a suggesting to use an external 2 bonnet relief/equalization system instead of 3. What do you think?, which configuration is the best?, which configuration is more commonly use in the industry?. What is the code to design this type of gate valves?

Thanks!