•
Main valve spherical screw (015)
- Inspect the hinge surface (sphere) of the spherical screw.
If it is galled, scratched, corroded or pitted the disc shall be replaced.
•
Main valve seat (006)
- Inspect the centering diameter. It shall be free of any burrs.
- Inspect the seating. Any scratch or impact mark less than 0.5mm deep on the seating surface
shall be removed by lapping. The remachining or replacement of the nozzle seating surface is
recommended if there is any impact mark deeper than 0.5mm.
•
Main valve disc and disc washer (011,014)
Inspect each face of the disc and disc washer in particular the surface in contact with the primary seal
(007). If it is galled, scratched, corroded or pitted there shall be replaced.
•
Main valve diaphragm support and washer (021,022)
Inspect each face of the diaphragm support and washer in particular the surface in contact with the
diaphragm(020).If it is galled, scratched, corroded or pitted there shall be replaced.
9.2.3
MAIN VALVE RE-ASSEMBLY
•
Seat (006) /O-Ring seat gasket (043)
- Ensure the body groove is clean and insert the gasket (043) into it.
- Tighten the screws (036) with Nord-Lock
®
washer to rated torque shown on Table 1.
Grease the threads with cryogenic grease.
Nota:
Trillium Flow Technologies
TM
recommended to use cryogenic and oxygen grease type ORAPI CT830 (-
40°C/+280°C)
or
CT1240(-40°C/320°C).
FIGURE 8-SEAT
FIGURE 7-SPHERICAL SCREW
23
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74LP PRESSURE RELIEF VALVE
SARASIN-RSBD
™
