The Atlas Copco Screw Compressor MPV (Minimum Pressure Valve) Kit is a specialized maintenance solution designed to restore the functionality of the critical discharge valve located at the top of the air-oil separator tank. This kit contains all the necessary high-precision components—including the spring, piston, O-rings, and seals—to ensure the valve maintains a constant minimum internal pressure of approximately 4 bar ($60$ psi). By keeping this pressure stable, the MPV ensures proper oil lubrication to the screw element during startup and optimizes the efficiency of the air-oil separation process before compressed air is discharged to the system. Replacing these parts with a genuine kit prevents common issues like oil foaming, internal air leakage, and pressure instability, ultimately safeguarding the compressor's "heart" and reducing energy-wasting pressure drops.