V-TORK AWWA/water Knife Gate valve standard describes Bonneted / Bonnetless and one piece/two piece construction which is made of stainless steel /cast iron /ductile iron body with resilient or metal seated knife gate valves. Theses AWWA valves are especially used in water, wastewater, and sludge water systems. V-TORK Valves are specially manufactured by AWWA standard to suit critical water applications.