Australian Pipeline Valve - Installation, Operation and Maintenance Manual
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LUBRICATED PLUG VALVES - SAPM/SAPL
Install the correct studs and nuts for the application and place the gasket between the flange facings.
Stud nuts should be tightened in an opposing crisscross pattern in equal increments
to ensure even gasket compression.
3.4.3 Socket weld Ends
Remove 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 the fillet weld.
Welded end plug valves in smaller diameters should be lightly closed to prevent
damage to the seating surfaces and stem caused by thermal expansion during the
weld process.
3.4.4 Buttweld End Valves
Clean 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 or body is compatible with the welding procedure.
(Refer our compatibility cross reference chart for equivalent pipe, valve & fittings grades).
3.4.5 Valve Installation by Welding
After welding completion, open the valve and flush line to clean out any foreign matter.
The responsibility for welding of the valves into piping systems is that of those performing the welding.
Refer to ASME B31.1, B31.3 etc. Written welding procedures covering all attributes of the process and
materials to be welded shall be in accordance with Section IX of the ASME Boiler and Pressure Vessel Code
and any additional requirements from the applicable piping code including any possible necessary
localised post weld heat treatment depending on material specifications.
Packing leakage could result in personal injury. Valve packing is tightened prior to
shipping but may require readjustments to meet specific service conditions. Do not
attempt to change packing or stem seals whilst the valve is in line under pressure.
