b'MULTI-WAY BALL VALVES - BV509/509A, BV2057, BVL50~L54, SL8142-FZ SERIES2.2 PREPARATION FOR INSTALLATIONRemove protective end caps or plugs and inspect valve ends for damage to threads, weld ends or flange faces.Thoroughly clean adjacent piping system to remove any foreign material that could cause damage to seating surfaces during valve operation.Verify that the space available for installation is adequate to allow the valve to be installed and to be operated.2.3 END CONNECTIONSStud nuts should be tightened in an opposing criss-cross pattern in equal increments to ensure even gasket compression.2.3.1 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 flowpath.2.3.2 Flanged EndsCheck to see that mating flanges are dimensionally compatible with the flanges on the valve body ensure sealing surfaces are free of debris. Install the correct studs and nuts for the application and place the gasket between the flange facings.2.3.3Socket weld EndsRemove all debris, grease, oil, paint, etc., from the pipe that is to be welded into the valve and from the valve end connections. Insert the pipe into the valve end connection until it bottoms out in the socket weld bore. Withdraw the pipe 1/16 so that a gap remains between the pipe and the bottom of the socket weld bore to prevent cracks (ASME B16.11). Tack the pipe into the valve and complete thefillet weld.8 Flowturn - Installation, Operation and Maintenance Manual'