3.1.3 Thermometer
The thermometer shows the cooling water temperature in the cooling water chamber.
3.1.4 Shaft seal on motor side and vacuum side
The sealing systems prevent any penetration of process gases into the storage chambers. A sealing
gas system may improve effectiveness of the sealing systems, depending on the respective application.
3.1.5 Gas ballast
An integrated gas ballast system serves the controlled supply of ambient air or inert gas into the suction
chamber. Gas ballast supports the reduction of condensate accumulating in the pumping system.
3.1.6 Sealing gas system
Sealing gas is used to protect the screw pump in dusty processes, or wherever excessive gas through-
puts are prevalent. Sealing gas prevents the ingress of damaging substances into the motor and bear-
ing area. The supply is carried out either via a sealing gas valve or a sealing gas throttle without control.
3.1.7 Flushing gas system
Injecting flushing gas dilutes the process gas and avoids condensation in the vacuum pump.
3.1.8 Safety valve
The safety valve prevents overpressure in the secondary cooling loop and opens at a pressure of
6000 hPa.
3.2 Identifying the product
► To ensure clear identification of the product when communicating with Pfeiffer Vacuum, always
keep all of the information on the rating plate to hand.
► Observe the motor-specific data on the motor rating plate attached separately.
3.3 Product features
Pump type
Characteristics
Hepta 630 P
● Nominal pumping speed at 50 Hz/60 Hz: 630 m
3
/h
● Water cooling
● Thermal circuit breaker
● Sealing systems
Tbl. 4:
Characteristics of the screw pumps
3.4 Scope of delivery
● Screw pump
● Lubricant
● Cooling liquid (Zitrec M 25), filled
● Locking caps for vacuum and exhaust connection
● Protective strainer
● 3 eye bolts
● Coupling for screw pump without a motor
● Operating instructions
Product description
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