Our standard butterfly valves can be used for air, gas, and water applications where absolute "tight" shut-off is not required. These low pressure, metal seated valves are furnished with a cast iron body and disc. Type 304 stainless steel shafts, teflon bearing, teflon packing, steel packing gland and a steel pipe plug. 

http://www.advancedvalve.com/images/standard-butterfly-valve.jpg

Our standard valves are:

• Available in wafer or lug.
• Suitable for 25 psi differential pressure through the 12" size and 15 psi differential in sizes 14" and above.
• Designed to fit between ANSI 125/150 LB. or RPM flanges.
• Able to handle temperature from -20ºF to +450ºF.

All standard valves are available in various seat configurations to meet specific applications and service conditions. Some of the available seat designs would be: angle seat, step seat, scissor seat, clearance seat, resilient seat, o-ring seat, and tadpole seat.

(Note: These valves can also be furnished for 50 psi differential pressure with the same trim options that are available for the low pressure series.)