Curtiss-Wright 2600 Series - Appendix C: O-Ring Construction

Figure C.1 – O-ring Detail D-K Orifice
Figure C.2 – O-ring Detail L-U Orifice
31
Appendix C: O-Ring Construction
Due to corrosion, metal-to-metal seats can eventually leak. With the proper
selection of the Farris O-ring seat pressure seal, seat tightness can be
improved and maintained. Because O-rings are elastomeric, they should
be handled carefully. Typically, O-rings should be replaced during your
normal maintenance interval. O-rings are not repairable.
Standard seat tightness for O-ring seated valves is no leakage at 90% of
set pressure for both conventional and bellows valves following Farris
standard seat tightness test procedure. At set pressures of 50 psig and
below, leakage test shall be made at 5 psig below set pressure.
The O-ring seat seal option is available for
2600/2600L/2600S Series valves in both
conventional and bellows construction. Farris
Engineering has two different O-ring designs
which depend on the orifice of the pressure
relief valve.
Stem Retainer
Disc Holder
Disc
O-ring
Flat Head Machine Screw
Nozzle
Stem Retainer
Disc Holder
Disc
O-ring Retainer
O-ring
Flat Head Machine Screw
Nozzle
Jack Screw Plug
NOTICE
O-rings are not repairable
and should be replaced
if worn or damaged.