Screw air compressors are essential for continuous and efficient compressed air supply in industrial environments. However, low pressure issues can occur during operation, affecting performance and productivity. Understanding the potential causes of low pressure in screw air compressor systems is crucial for timely troubleshooting and maintenance.
In this article, we’ll explore the 10 most common reasons for low pressure in screw air compressors, along with practical solutions to help you maintain optimal performance.
📌 Learn more about Baldor’s high-efficiency screw air compressors and how they deliver stable pressure for diverse industrial applications.
1. Air Release Valve Malfunction
When the air release valve fails to close properly during load mode, compressed air escapes, leading to reduced system pressure. Inspect and replace faulty valves promptly to restore proper functionality.
2. Pressure Switch Set Too Low
In relay-controlled systems, an incorrectly set pressure switch can cause premature unloading, preventing the compressor from reaching the desired pressure. Re-calibrate the pressure switch according to system requirements.
3. Faulty Pressure Gauge
A broken pressure gauge may display incorrect readings, misleading operators. If in doubt, replace the pressure gauge with a new, accurate model.
4. Pressure Switch Failure
When the pressure switch itself malfunctions, it can prevent the compressor from switching modes properly. Inspect the switch and replace it if necessary.
5. Air Leakage in Control Pipeline
Leaks in the control pipeline can cause the intake valve to fail to open fully, limiting airflow and system load. Check all control lines and fittings for air leaks and repair them to ensure full compressor load capacity.
6. Air Demand Exceeds Supply
When compressed air demand surpasses the compressor’s supply capacity, the system pressure will drop. Check for open valves or air leaks in the system and reduce non-essential air usage where possible.
7. Clogged Air Filter
A blocked air filter restricts air intake, reducing the air volume available for compression. Regularly inspect and replace air filter elements to maintain steady airflow and compressor efficiency.
8. Malfunctioning Pressure Regulator
The pressure regulator ensures balanced air output based on system demands. If it fails or becomes misaligned, pressure may fluctuate or drop. Replace or recalibrate the pressure regulator as needed.
9. Oil-Gas Separator Blockage
A clogged oil-gas separator increases resistance in the system and reduces airflow, resulting in low pressure. Monitor pressure differential indicators and replace the separator filter when required.
10. Intake Valve Not Fully Opening
The intake valve controls the volume of air entering the compressor. If it doesn’t fully open due to mechanical issues or control malfunctions, the compressor cannot deliver full pressure. Clean, inspect, and test the intake valve to ensure it opens correctly during full load operation.
Conclusion
Low pressure in a screw air compressor can stem from various mechanical and control issues. Routine inspections, timely part replacements, and correct system calibration are key to preventing these problems.
By understanding and addressing the root causes listed above, you can ensure reliable performance and extended lifespan of your air compressor system.
💡 For more expert guidance on troubleshooting and optimizing your compressed air system, explore Baldor’s knowledge center or contact our technical support team.