Most of the 2.5 inch valves
used in the walkway begin to be made of ductile cast iron, as copper or stainless steel becomes much more expensive. The number of butterfly valves
used in the 2.5 inch small bore pipe will be more because butterfly valves
are light in structure, open and close quickly and have low flow resistance. The opening and closing of the valve rely on the rotating handle to drive the stem, which makes the disc produce 90 degrees of rotary motion. The valve is closed when the handle is pulled clockwise or the hand wheel is turned. Otherwise open.Low price to wafer butterfly valves
, very adaptable to installation controls.