Butterfly or Gate Valve for 30"diameter?
Butterfly or Gate Valve for 30"diameter?
(OP)
It seems that BFV's are cheaper than GV's at this diameter, but makes 'pigging' the line much more difficult. Any opinions on what to select if you are worried about: Initial cost , lifetime cost , and maintenance? I understand that BFV's are cheaper initially, but GV's may catch up when you consider the ability to clean the line and make the lifetime electricity bill of the pumps less expensive.





RE: Butterfly or Gate Valve for 30"diameter?
RE: Butterfly or Gate Valve for 30"diameter?
RE: Butterfly or Gate Valve for 30"diameter?
Gate valves are excellent, and in my opinion, preferred, for isolation.
It depends what you are doing with each valve.
Remember: The Chinese ideogram for “crisis” is comprised of the characters for “danger” and “opportunity.”
-Steve
RE: Butterfly or Gate Valve for 30"diameter?
RE: Butterfly or Gate Valve for 30"diameter?
This extra stuff usually drives the cost above the GV alone.
Also consider the cavitation effects on the BFV with respect to is proximity from changes in direction and diameter of the waterway. AWWA has a handbook on the subject of cavitation in a BFV