Piston compressor Silent HE

heliumelectricstationary

Overview
The Silent HE is part of the HELIUM LINE: a four-stage, high-pressure helium compressor engineered for large-capacity helium compression and reliable breathing-air production while minimizing acoustic impact. Supplied in a silenced cabin chassis for installations where low noise is required.

Pumping unit (4-stage)

• Aluminum monoblock high-pressure pumping unit
• Forced lubrication via low-pressure gear pump
• Suction filter: 10 µm
• Pipes, fittings and nuts in AISI 316 stainless steel for the critical circuit
• Intermediate condensate separators after the 2nd and 3rd stages
• Minimum lubricating oil pressure switch
• Safety valves after each compression stage
• Special cast iron cylinders with low-roughness lapping
• Forged aluminum connecting rods
• Forged steel crankshaft
• High-flow valves on the 1st, 2nd and 3rd stages
• Heavy-duty roller bearings
• Hardened steel third stage with six special cast-iron bands
• Thrust pads on 2nd and 3rd stages to eliminate lateral piston forces
• Hyperfilter filtration system

Electric motor
Three-phase electric motor transferring motion to the pumping unit via belt. Available power ratings for this model: 7.5–11 kW.

Hyperfilter purification system
Positioned after the final compressor separator and before the pressure maintenance valve, the Hyperfilter is a high-capacity purification circuit composed of two cartridges in series: a molecular sieve cartridge for moisture removal followed by a cartridge combining molecular sieve and activated carbon to remove oil vapors and contaminants. When fitted with original cartridges, the system enables reliable breathing-air treatment according to DIN EN 12021. Filtering capacity (inlet air 20°C, 200 bar): 3,050 m³.

Electrical cabinet

• ON/OFF switch with motor protection
• Digital electronic pressure switch to stop the compressor at final pressure
• Drainage of all separators between stages and of the final separator during operation
• Timer for automatic condensate drain device
• Integrated no-load startup (automatic discharge at each shutdown)
• Condensate collection tank: 5 L (with silencer); usable capacity approx. 3 L for environmental disposal
• Interstage pressure gauges to display operating pressure per stage (useful for valve tightness checks and fault diagnostics)

Frame and cabin
Silenced cabin chassis with vertical layout for low-noise environments. External oil level and drain. Control console with interstage gauges, oil pressure gauge, internal temperature indicator, presence and phase-sequence alarm, oil shortage alarm, run/stop and manual condensate drain controls. Constructed in steel with scratch-resistant powder coating in RAL 9005 black.

Purification system (detailed)
The Hyperfilter comprises two cartridges in series: first a molecular sieve for moisture removal; second a combined molecular sieve and activated carbon cartridge to remove oil vapors and contaminants. An intermediate separator between the 2nd and 3rd stages maximizes moisture extraction. This configuration provides broad-range filtration for high-volume breathing-air applications.

Standard equipment

• Interstage control manometers
• Dual PED-certified Hyperfilter system
• Inside-cabin temperature monitoring with automatic shutdown
• Automatic rotation direction control
• Electronic pressure switch with automatic shutdown
• Oil level control with automatic shutdown
• Oil pump
• Automatic condensate drain with conveying system into the canister
• Frame color: Black RAL 9005

Technical specifications

• Pumping unit: 4-stage high-pressure unit (aluminum monoblock)
• Motor power options: 7.5–11 kW (three-phase)
• Suction filter rating: 10 µm
• Materials: AISI 316 stainless steel pipes/fittings/nuts for critical circuit
• Condensate collection tank: 5 L (≈3 L usable) with silencer
• Hyperfilter capacity: 3,050 m³ (inlet air 20°C, 200 bar)
• Safety: safety valves after each stage; interstage gauges for diagnostics
• Cabin: silenced vertical chassis, powder-coated steel RAL 9005
• Lubrication: forced lubrication via low-pressure gear pump; minimum oil pressure switch
• Separation: intermediate condensate separators after 2nd and 3rd stages
• Construction highlights: special cast-iron cylinders, forged connecting rods, forged steel crankshaft, hardened 3rd stage with six cast-iron bands, thrust pads on 2nd & 3rd stages