Atlas Copco Oil Stop / Check Valve Kit – 2901021704

The Atlas Copco 2901021704 Oil Stop / Check Valve Kit C111 is a genuine OEM maintenance kit designed for selected Atlas Copco oil-injected rotary screw air compressors. This service kit restores the performance of the oil stop and check valve assembly, a critical component that prevents oil backflow when the compressor unloads or shuts down. By maintaining proper oil circulation and system pressure, the kit helps protect the airend, bearings, and other internal components from premature wear while ensuring reliable compressor operation.

Manufactured to Atlas Copco’s stringent OEM specifications, the 2901021704 Oil Stop / Check Valve Kit includes all the essential components required for a complete valve overhaul, including the oil stop valve, check valve, springs, O-rings, gasket, plugs, and sealing washer. Each component is precision-engineered for accurate fitment, dependable sealing, and long service life under demanding industrial conditions. Regular replacement during scheduled maintenance helps improve compressor efficiency, reduce oil leakage, and minimize unexpected downtime.

Features

• Genuine Atlas Copco OEM maintenance kit
• Part Number: 2901021704
• Oil Stop / Check Valve Kit C111
• Restores proper oil flow and backflow prevention
• High-quality valves, springs, and sealing components
• Precision-engineered for OEM fit and performance
• Durable construction for extended service life
• Easy installation during preventive maintenance

Typical Kit Contents

• Oil Stop Valve – 1 pc
• Check Valve (C111/C106) – 1 pc
• Spring Check Valve – 1 pc
• Spring Oil Stop Valve – 1 pc
• O-Ring 59.5 × 3 – 1 pc
• O-Ring 32.2 × 3 – 1 pc
• O-Ring 19.2 × 3 – 1 pc
• Gasket – 1 pc
• Plug G 1 – 1 pc
• Plug G 1/4 A – 1 pc
• Dowty Seal Washer (1/2″) – 1 pc
• Installation Instructions – 1 pc

Applications

• Atlas Copco Oil-Injected Rotary Screw Air Compressors
• C111/C106 and compatible compressor platforms
• Compressor oil circulation and lubrication systems
• Preventive maintenance and valve overhaul

Benefits

• Prevents oil backflow during shutdown
• Maintains proper oil pressure and lubrication
• Improves compressor reliability and efficiency
• Reduces internal wear and oil leakage
• Minimizes maintenance costs and unplanned downtime
• Extends compressor service life

Specifications

• Part Name: Oil Stop / Check Valve Kit C111
• Part Number: 2901021704
• Brand: Atlas Copco
• Application: Oil stop and check valve maintenance for oil-injected rotary screw air compressors
• Approximate Weight: 533 g