The Turbo Air® 3000 Centrifugal Compressor Compressor Handbook

Maintenance
Discharge Air Check Valve Inspection
At 6 month intervals, use the following procedure to inspect the discharge air check valve to determine
whether it is still in good working order or whether it must be replaced.
1. Shut down the compressor and lockout the main motor starter.
2. Close the system block valve and exhaust any pressure in the check valve line.
3. Remove the check valve from the piping.
4. Remove both plugs and the hinge pin, and then inspect the hinge pin, disc, and seat for wear.
5. If any parts are worn or damaged, replace the valve.
— or —
If wear is not apparent, clean, reassemble, and reinstall the valve, being sure that the valve disc
operates freely.
6. To verify correct orientation of the discharge air check valve, use the following criteria:
· The check valve should be located downstream of the blow-off valve and upstream of the
system block valve.
· The arrow should be pointing in the direction of flow (away from the compressor).
· For horizontal installation (the recommended position) the hinge pin must be above the
centerline, which is assured when the metal label can be seen from the top of the valve.
WARNING:
When installing a new discharge check valve or reinstalling a valve, always be certain of
proper orientation. Incorrect orientation will cause equipment damage.
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