Armstrong CD72SR Manuale di installazione e funzionamento - Pagina 4
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Maintenance Requirements
Wear progresses simultaneously on both the disc and the seating surfaces. Simply replacing the
disc is not sufficient to repair a disc trap; both disc and seat must be renewed. In cases of minor
wear causing cycling, the disc may be replaced but the seat surfaces must also be lapped and/
or cleaned again to near flatness. If a trap's seat wear is deeper than .01 (0.25), it has progressed
beyond the depth of the hardened seat surface of most disc traps. If the seat is lapped flat, the
softer material is exposed, and additional service life will be shortened. Theoretically the seats
may be lapped or machined, however, any alteration of the internal components of any disc trap
can change its operating characteristics. Armstrong does not recommend re-lapping the seating
area of the Series CD Controlled Disc Traps.
Seat and Disc replacement procedure
CAUTION: This set of instructions is for a complete replacement of repair kit including
cap. It may be noted that, during disassembly of the cap, the cap threads may get
damaged and may not seal properly as intended during reassembly. In such case, the
existing cap needs to be replaced with a new cap.
Please refer to torque requirements for sealing the cap in step no.10 of the "Seat and
Disc replacement procedure".
DISASSEMBLY
1. Ensure that the pressure has been safely relieved and the trap is cooled out. Secure the trap
firmly with a vise with the cap facing upward.
2. Loosen the cap and unthread it by hand.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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