... Screwed Ball Valve With Pneumatic Actuator1)Material:SS304,304L,316,316L2)Size:1/4''-4'&DN6-DN1003)Certificate:API 6D & ISO9001:2000 & CE4 ... . Chemical, Refinery Plant2. Gas Purification Plant3. Power Station, Shipbuilding4. Recycling Facilities 1. Manual ValveBall Valve, Butterfly Valve, Gate, Globe, Check Valve, Strainer, Needle valve2 ...