API St 608 pdf download Metal Ball Valves—Flanged, Threaded, and Welding Ends 5.3.9 Upstream sealing, trunnion-mounted ball valves shall have a test port into the body cavity between seats toallow seat testing as specified in APl 598. This test port shall have taper pipe threads in accordance withASME B.1.20.1 and shall be fited with a solid test plug conforming to...