The VCE lubricated vacuum pumps have a fine micro filter on the suction side and on the outlet side an oil and oil mist separator to return the oil to the oil circulation system. A fan between the pump housing and the motor provides intensive air cooling. The fan is located in a fan housing that guards against it being touched. An integral non-return valve prevents the evacuated system from being ventilated after the pump has stopped and it prevents the feed chamber from being saturated with oil after the system has stopped. This would lead to oil knocking when the system started up again. A gas ballast valve fitted as standard prevents condensation of water vapor in the inside of the pump when low amounts of steam are sucked in when the pump is at operating temperature. A reinforced gas ballast can be provided for higher amounts of water vapor. The pumps are driven by standard flanged three-phase motors using a coupling.

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