78 SERIE SAFETY RELIEF VALVE
SARASIN-RSBD
™
• Main valve piston (12)
Inspect the external diameter of the piston part. It shall not have any scratches or be galled. If this diameter is
damaged carefuly check the sliding rings. They might be damaged. Inspect the dynamic seal seating surface.
Roughness of the seating surface of the nozzle shall be Ra 0.4µm (16 RMS). Touch check the roughness of lapped
seating surfaces according to ISO 2632 (or equivalent) test specimen. If the surface is scratched, pitted or corroded,
the piston shall be changed.
• Main valve sliding rings (8) (61)
Inspect the pairs of sliding rings for any missing splinter, broken part, desintegrating area. If the sliding rings are in
proper state, proceed with thickness verification. If not replace them. If any sliding ring thickness falls below the
tolerancy given in table below, the sliding ring pair shall be replaced.
• Main valve piston seal (10)
Inspect the piston seal for any scratches or impact marks on its lips. Ensure the internal spring is present and in good
state. Any abnormal deformation of the spring, due to improper disassembly or reassembly, will cause the piston to
leak. In case of any of these damages, the piston seal shall be replaced
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