Dive compressor Silent

breathing airpistongear

Overview
The Silent compressor from Coltri's Heavy Duty Line is a silenced cabin chassis solution engineered for production of high-pressure breathing air where low noise and continuous professional operation are required.

Pumping unit

• 4-stage high-pressure pumping unit, aluminum monoblock construction
• Forced lubrication via low-pressure gear pump with minimum oil pressure switch
• Suction filter 10 µm; pipes, fittings and nuts in AISI 316 stainless steel
• Intermediate condensate separators after the 2nd and 3rd stages; safety valves after each stage
• Special cast iron cylinders with low-roughness lapping; forged aluminum connecting rods and forged steel crankshaft
• High-flow valves on 1st–3rd stages; heavy-duty roller bearings; thrust pads on 2nd and 3rd stages to eliminate lateral piston loads

Electric motor
Three-phase electric motor available from 7.5 to 11 kW. Motion is transmitted to the pumping unit via belt drive for straightforward maintenance and service.

Hyperfilter purification system

• Two-cartridge in-series purification: 1) molecular sieve for moisture removal; 2) molecular sieve + activated carbon for oil vapor and contaminant removal
• Separator between 2nd and 3rd stages improves moisture extraction
• Filtering capacity (inlet air @ 20°C, 200 bar): 3,050 m³
• Designed to enable conformity with DIN EN 12021 when original Hyperfilter cartridges are used

Electrical cabinet

• ON/OFF switch with motor protection
• Digital electronic pressure switch to stop compressor at final pressure
• Drainage of all interstage separators and final separator during operation; timer for automatic condensate drain
• Integrated no-load startup (automatic discharge at each stop) and 5 L condensate collection tank with silencer (usable ~3 L) for controlled disposal
• Interstage pressure gauges for diagnostics and valve tightness checks

Frame

• Silenced cabin chassis with vertical layout, steel construction with scratch‑resistant RAL 9005 powder coating
• External oil level and drain; control console with interstage gauges, oil pressure gauge and internal temperature indicator
• Alarms for presence, wrong phase sequence and low oil; manual condensate drain and run/stop controls to simplify operation and maintenance

Standard equipment

• 4 cylinder connections selectable: DIN 232, DIN 300 or INT/YOKE 232 bar
• 4 filling whips 1.2 m long
• Pressure holding valve; interstage control manometers
• Dual PED-certified Hyperfilter system; automatic condensate drain with conveying system into the canister
• Automatic rotation direction control; electronic pressure switch with automatic shutdown; oil level control with automatic shutdown; oil pump included
• Cabin automatic shutdown on high internal temperature; frame color RAL 9005

Applications

• Production of breathing air for professional use (diving, emergency services, industrial breathing-air systems) and high-pressure industrial applications requiring low-noise operation

Notes

• The Hyperfilter and original cartridges are required to achieve DIN EN 12021 compliance. Performance figures refer to inlet air at 20°C and 200 bar.

Technical specifications

• Product line: Heavy Duty Line
• Pumping unit: 4-stage high-pressure, aluminum monoblock
• Filtration: suction filter 10 µm; Hyperfilter dual-cartridge (molecular sieve + activated carbon)
• Hyperfilter capacity: 3,050 m³ (inlet air 20°C, 200 bar)
• Electric motor: three-phase, 7.5–11 kW
• Condensate tank: 5 L (usable ~3 L)
• Cylinder connections: DIN 232 / DIN 300 / INT-YOKE 232 bar (4 connections)
• Filling whips: 4 × 1.2 m
• Safety: safety valves after each stage; interstage gauges for diagnostics
• Cabin: silenced vertical chassis, external oil level/drain, RAL 9005 powder coating