Purge Cycle

Each Vmax system is tested and checked at the factory prior to shipment to ensure trouble-free operation. In the unlikely event you encounter a problem, we recommend that you consult with your local distributor for parts/service. Remember, when calling for service, parts or system information, always have the pump or system model number and serial number ready. 

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Purge cycles are designed to purge process air from the vacuum system at shutdown to prevent non condensables from collecting in the vacuum pump. This is often used in laboratory applications. Systems designed with purge cycles include automatic purging of the pump prior to pump shutdown and lead/lag operation with pump alternation for multiplex systems. On/off setpoints and alternation is accomplished through the use of a PLC or logic controller.

Auto Purge operates in the following manner: Pumps start based on vacuum setpoint demands. When the pump starts, the inlet isolation valve solenoid (normally closed) opens and allows air to reach the actuator and open the inlet isolation valve. The purge solenoid valve (normally closed) remains closed.

Before the pump shuts down, it must operate through a 10-minute purge cycle. In the purge cycle, the pneumatic inlet isolation valve solenoid is closed, allowing the inlet isolation valve to be closed. The purge solenoid valve opens to allow atmospheric air into the system to remove condensable vapors.

If the pump is stopped in the normal mode, it will continue to run through the 10-minute purge cycle. FOR EMERGENCY SHUT DOWN USE THE ESTOP! Do not forget that the inlet isolation solenoid needs to be energized to open the valve when the system demand requires it.

If the system is placed in the purge mode, the system will run through the 10-minute purge cycle and shut down. This is a momentary contact closure. This process is only for DEKKER Vacuum systems that are equipped with the optional Auto Purge function.

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