Discharge event refers to the time interval in milliseconds for the discharge valve plates to open, stabilize and close. Should this time window become too short, higher valve impact velocities will result, and consequently reduced valve reliability. Ariel has set the limit for the discharge event to be 2.7 milliseconds. Discharge event times of between 4.5 and 2.7 milliseconds should be reviewed by Ariel Valve Engineering to select proper valves for the application.
Discharge event times can be improved by lowering compressor speed, decreasing the compression ratio, decreasing cylinder clearance, or by decreasing valve lift.
Ariel
Corporation Application Manual
17-Sept-2001