Check Valve Kit Replacement – 2901050301

The 2901050301 Check Valve Kit is designed to service the compressor’s oil stop check valve. This valve allows compressed air and oil to flow in the correct direction while preventing reverse flow when the compressor unloads or stops. It protects the airend, maintains oil circulation, and prevents oil from draining back into the compressor, ensuring smooth start-up and efficient operation. The kit typically includes a check valve, spring, O-rings, and washer for complete valve maintenance.

Working Process

1. Compressor Start-up
   • As the compressor starts, the check valve remains properly seated until sufficient pressure is generated.
2. Normal Operation
   • The valve opens automatically under system pressure, allowing compressed air and lubricating oil to flow in the correct direction through the compressor system.
3. Backflow Prevention
   • When the compressor stops or unloads, the spring forces the valve closed, preventing compressed air and oil from flowing backward into the airend.
4. Oil Retention
   • The valve helps retain oil in the lubrication circuit, preventing oil drain-back and ensuring immediate lubrication during the next startup.
5. Continuous Protection
   • During every operating cycle, the valve automatically opens and closes according to pressure changes, maintaining system efficiency and protecting internal components.

Key Features

• Prevents reverse flow of compressed air and lubricating oil.
• Maintains proper oil retention for quick lubrication at startup.
• Protects the airend and internal compressor components.
• Restores reliable check valve performance during maintenance.
• Includes check valve, spring, O-rings, and related sealing components.
• Compatible with selected Atlas Copco GA30, GA45, and GA55 rotary screw air compressors using Part No. 2901050301.