Controlled pump assembly with high vacuum, pilot pumps has control unit that switches on pilot pump based on pilot pressure, opens valve when pilot pressure exceeds upper threshold

摘要

The controlled pump assembly has a high vacuum pump (2) and a pilot pump (1) that prepares a certain input pressure for the high vacuum pump, a switchable valve (4) between the pumps, a pressure sensor (5) that determines the pilot pressure at the output of the high vacuum pump, a control unit (6) that switches on the pilot pump based on the pilot pressure and opens the valve when the pilot pressure exceeds an upper threshold. An Independent claim is also included for a method of controlling a pump assembly.