b'OILFIELD PLUG VALVE - LT - SP STYLE1.3 END CONNECTIONS - INSTALLATION1.3.1 Threaded EndsCheck condition of threads on mating pipe.Apply joint compound to the male end of joint only. This will prevent compound from entering the valve flow path.1.3.2 Flanged EndsCheck to see that mating flanges are dimensionally compatible with the flanges on the choke and ensure sealing surfaces are free of debris.Install the correct studs and nuts for the application and place the flange gasket between the flange facings.Stud nuts should be tightened in a an opposing criss-cross pattern in equal increments to ensure proper gasket compression.1.3.3 Buttweld EndsClean the weld ends as necessary and weld into the line using an approved weld procedure. Make sure the pipe and body material given on the nameplate is compatible with the welding procedure. 1.3.4 Valve Installation by WeldingLeave valves assembled and in the lightly closed position during installation, welding and post-weld heat treatment. This will prevent the valve seat from floating or distorting during the process. After welding completion, open the valve and flush line to clean out any foreign matter.Stem seal leakage could result in personal injury. Valve stem area is tested prior to shipping but should be again checked to ensure no leakage.Check the stem sealing area for pressurised process fluids even after the valve has been removed from the line, particularly when removing seals or fittings.Australian Pipeline Valve - Installation, Operation and Maintenance Manual 5'