tlas Copco 1622-3694-80 Blow Off Valve — OEM Replacement for GA Series Screw Compressors

The Atlas Copco Blow Off Valve (Part No. 1622-3694-80 / 1622369480) is a genuine replacement component for the GA series oil-injected rotary screw air compressors. It is an essential part of the compressor's unloading system: when the machine switches to idle or stops, the valve releases the pressure from the oil separator / air receiver, allowing the non-return valve to close and ensuring a load-free start on the next cycle.

Keeping this valve in good working condition protects your compressor from hard starts, reduces wear on the drive train and air end, and extends the service life of the entire machine.

Fitment & Compatibility

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Key Features & Benefits

• Reliable unloading — safely releases separator pressure when the compressor idles or stops, preventing oil carry-over and hard re-starts
• Extends service life — avoids pressure-loaded starts that stress the motor, drive and air end
• OEM-equivalent fit — exact part number match, bolt-on installation, no modification required
• Durable construction — built to withstand high-pressure operation and demanding industrial environments
• Easy maintenance — straightforward replacement keeps your planned maintenance schedule simple and cost-effective

How It Works

During compressor operation the valve stays closed. When the compressor is switched to load/unload or stop mode, the blow off valve opens and vents the pressure inside the oil separator to atmosphere. This lets the minimum pressure / non-return valve close, so the compressor can restart without torque load — a key factor for energy efficiency and reliability.