vakuumski impuls

impuls = kratkotrajna promjena el. napona, stuje ili neke druge veličine koja je normalno konstantna
Anićev rječnik hrvatskoga jezika

Only 2 vacuum pulses (vs. 4 in a normal cycle) were used to create conditions of incomplete chamber air removal.
http://www.google.com/search?client=opera&rls=en&q="vacuum p...

This cycle has three or four vacuum pulses and three steam pulses into positive pressure during its conditioning phase which allows good air removal and steam penetration into the inside of hollow and/or complex instruments.
This cycle is very effective for air removal and steam penetration.
http://www.gkeaustralia.com/cycles.htm

removing air from the chamber during an air removal phase by admitting steam into the chamber and initiating a series of vacuum pulses by vacuum pump
http://www.freepatentsonline.com/20030035753.html

The cycle in FIG. 12 has one initial vacuum pulse before steam is injected, and the cycle in FIG. 13 uses four vacuum pulses.
http://www.patentstorm.us/patents/5866356-description.html