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Reliability through Simplicity
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The Bulldog, a Rotary Screw Compressor that has the wonderful attributes of a rotary machine, but with the simplicity of a reciprocating unit! Designed for a long life, high efficiency, low noise levels and simple but effective controls.
The package contains the following major components:
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 Airend
Manufactured by GHH-Rand in Germany, this high capacity, lubricated, rotary screw unit has rotors that are mounted on roller and ball bearings which accommodate the radial loads and axial thrusts. Air compression is achieved in a single-stage of compression. The resultant heat is removed by the oil ‘coolant’, which is injected between the two rotors during the compression process.
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 The Electric Motor
The Electric motor that drives the air compressor is an important component, playing a significant part in reliability and overall efficiency.
The Bulldog features an S1 Class F motor with forced ventilation, to guarantee maximum reliability in the harshest of working conditions.
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Power Transmission system
The Electric motor drives the compressor by means of a flat multi grooved belt system. This ensures that perfect screw compressor / motor alignment can be achieved. Quiet operation is the result, as is lasting reliability and high drive performance, ensuring that efficiency is maintained.
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Multifunctional Coolant Separator and Oil Filter system
A three-Stage coolant separation system ensures a maximum coolant ‘carry-over’ of only 3 – 5 ppm. The ‘Screw on’ coolant & separator filters can be changed in minutes.
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Control System
All air compressors deserve to be controlled in the simplest most efficient manner, ensuring that compressed air power is available when required.
The Bulldog control system comprises all the necessary components to ensure that the machine operates when required and is also protected against malfunction.
Simple controls make the Bulldog much more user friendly, ie, switch it on and let it run to it’s pre set operating pressure.
When the operating pressure (set in the pressure switch) is reached, the compressor stops and starts again from the reset pressure.
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Bulldog - Floor Mounted
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Model
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Receiver Size
(litres)
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Free Air Del.
(CFM)
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Free Air Del.
(Ltr/min)
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Motor
HP/kW
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Noise Level
dB(A)
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Dimensions
(LxWxH) cm
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Net Weight
(Kg)
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BD4
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n/a
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18
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510
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5.5/4
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64
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69 x 53 x 78
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130
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BD5
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n/a
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25
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720
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7.5/5.5
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64
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69 x 53 x 78
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130
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BD7
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n/a
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35
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980
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10/7.5
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67
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69 x 53 x 78
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130
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BD11
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n/a
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54
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1530
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15/11
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64
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70 x 64 x 96
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190
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BD15
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n/a
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68
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1920
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20/15
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64
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70 x 64 x 96
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190
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Bulldog - Receiver Mounted
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Model
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Receiver Size
(litres)
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Free Air Del.
(CFM)
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Free Air Del.
(Ltr/min)
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Motor
HP/kW
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Noise Level
dB(A)
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Dimensions
(LxWxH) cm
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Net Weight
(Kg)
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BD4
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190
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18
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510
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5.5/4
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64
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118 x 59 x 149
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210
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BD5
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190
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25
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720
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7.5/5.5
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64
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118 x 59 x 149
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210
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BD7
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190
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35
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980
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10/7.5
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67
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118 x 59 x 149
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210
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BD11
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270
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54
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1530
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15/11
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64
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158 x 64 x 148
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TBA
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BD15
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270
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68
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1920
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20/15
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64
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158 x 64 x 148
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TBA
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Performance is at a working pressure of 10 bar(g). For performances at other working pressures contact our technical department. Noise levels are +/- 3 dB(A)
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 Space saving packages
The Bulldog Range of rotary screw compressors are available receiver mounted and with Integral compressed air dryers to provide the highest quality compressed air. When coupled to high efficiency compressed air filters, compressed air can be provided for the most demanding of compressed air applications.
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