Unison Valves Pvt Ltd manufactures Three Piece Design Three Way Flanged Ball Valve. Unison Valves Pvt Ltd is an ISO 9001:2000 certified company. The company manufactures `UNISON` make Thermodynamic Steam Traps, Ball Valves, Globe Valves and Pneumatically Actuated Ball Valves at present and continuous efforts are on to increase the range. Three Piece Design Three Way Flanged Ball Valve has design standard at IS 9890-1981. The pressure testing stands at BS 6755 Part I/API 598/IS 6157-1981. Flange dimensions are ANSI B 16.5.