Product Description | 2
Instruction Manual COBRA NX 0950 A WCV_EN_en
7 | 44
NOTICE
Chemical compatibility of the process gases with the machine component materials.
Risk of corrosion inside the compression chamber which can reduce performance and its life-
time!
●
Check if the process gases are compatible with those following materials:
- Cast iron
- Steel
- Fluoroelastomer (FKM/FPM)
●
In doubt, please contact your Busch representative.
2.3
Start Controls
The machine is equipped with a variable speed drive.
2.4
Standard Features
2.4.1
Water Cooling
The machine is cooled by a cooling water circuit in the cylinder cover and cylinder.
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 [
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 [
7].
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
The barrier gas system allows the supply of compressed air or nitrogen into the motor side shaft
seals in order to improve the sealing efficiency.
