BUSCH COBRA NF 0750 A, Instruction Manual

Page: 8 / 44

2 | Product Description
8 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en
2.4 Standard Features
2.4.1 Water Cooling
The machine is cooled by a cooling water circuit in the cylinder cover, cylinder and in the motor.
2.4.2 Temperature Switch
The temperature switch monitors the cooling water temperature of the machine.
The temperature switch has one switch point:
Switch point T = 70°C Trip, the machine must be stopped, pin 1+2 (see Electrical Connection
of the Monitoring Devices [
➔
21]).
2.4.3 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Sealing systems prevent the process gas going to the bearings chambers.
Depending on the application, the sealing systems efficiency can be improved with a barrier gas sys-
tem, see
Barrier Gas System [
➔
8].
WARNING
The barrier gas system is mandatory for the suction of process gas with a volume of oxygen
higher than 21% (>21%).
2.5 Optional Accessories
2.5.1 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to counteract the
condensation of vapor inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Technical Data.
2.5.2 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas noise.
2.5.3 Barrier Gas System
WARNING
The barrier gas system is mandatory for the suction of process gas with a volume of oxygen
higher than 21% (>21%).
The barrier gas system allows the supply of compressed air or nitrogen into the motor side shaft
seals to improve the sealing efficiency.