128691-003 Minimum Pressure Valve for Quincy Screw Air Compressor System

Product Overview
Also known as a pressure sustaining valve or minimum pressure check valve, 128691-003 is installed in the compressed air outlet path of the compressor package. It allows airflow only after system pressure reaches the set minimum, preventing pressure collapse and improving separator efficiency.

Key Advantages
System Stability: Maintains minimum line pressure for smoother load/unload operation.
Separator Protection: Helps the air/oil separator reach working pressure faster and reduces oil carryover.
Industrial Build: Designed for continuous-duty screw compressor service.
Direct Maintenance Use: Suitable for compressor servicing, overhaul, and spare-parts stock.
Startup Support: Reduces sudden pressure loss when the compressor unloads.

Application Scenarios
Quincy screw air compressors such as QSF 125/150, QSI 1175/1500
Industrial plants, workshops, and compressed air stations
Compressor preventive maintenance and minimum pressure valve replacement
Service kits for air compressor repair teams