Metal Seated Gate valves are widely used for pipeline isolation in the water industry, typical applications include pump suction, pump discharge and upstream control valve isolation for large bore sizes.)
Butterfly valves are rotary valves in which a disc-shped closure member is rotated through 90d. Or approximately, to open or close the flow passage.
Air valves use to filling orenptying of the water main plus removal of accumulated air in normal servicee.
