Weld Overlay of Sealing Areas
Weld Overlay of Sealing Areas
(OP)
One of our client asks for weld overlay on sealing areas only if Lip-Seal is used for Ball Valves.
If a valves with Lipseal type sealing is recommended to have seal areas with weld overlayed, is it due to corrosion of seal areas or due to corrosion of spring used in lipseal ? If a valves with Lipseal type sealing is recommended to have seal areas with weld overlay, is it due to corrosion of seal areas or due to corrosion of spring used in lipseal ?
If a valves with Lipseal type sealing is recommended to have seal areas with weld overlayed, is it due to corrosion of seal areas or due to corrosion of spring used in lipseal ? If a valves with Lipseal type sealing is recommended to have seal areas with weld overlay, is it due to corrosion of seal areas or due to corrosion of spring used in lipseal ?





RE: Weld Overlay of Sealing Areas
Valvit
RE: Weld Overlay of Sealing Areas
RE: Weld Overlay of Sealing Areas
Valvit
RE: Weld Overlay of Sealing Areas
RE: Weld Overlay of Sealing Areas
Ball valves with soft seat PTFE would have little problem of corrosion for the PTFE.
PTFE lip seals have been observed to cause 'fretting' on stainless steel pump shafts. Some add a ceramic coating to pump shaft in area of PTFE lip seals. Surface oxides might get embedded in the PTFE to result in abrasive edge on PTFE lip seal? Ball valve cycling open-closed would not be comparable to pump shaft rotation velocities.
RE: Weld Overlay of Sealing Areas
Irrespective of your intended service, using a CRA overlay in the lip seal area is a cheap form of insurance compared to reworking valves after installation.