Compressor Unloader IntakeValves

Main Features

Cast Aluminum Alloy Body: High‑strength precision casting, good heat‑resistance and anti‑corrosion performance, adapts to high‑temperature and high‑pressure working environment of screw compressors.

Integrated Unloading‑blow‑off Structure: Built‑in blow‑down port and check‑valve function. Prevents oil‑gas reverse ejection during emergency shutdown, reduces cavitation noise of air‑end, stable response for frequent load‑unload cycles.

Complete Assembly Design: Comes with valve disc, spring and sealing components. Whole‑unit replacement, convenient for field overhaul and maintenance.

Applications

Opens inlet for loading to suck fresh air into air‑end; closes inlet and triggers blow‑down venting under unloading condition. Stabilizes system pressure, avoids heavy‑load startup and protects compressor main unit.

Extended Application: Air intake control for other screw compressors with matching flange installation size.

Working Principle

Loading state: Control air signal pushes internal actuator, valve disc opens, fresh air flows into compressor air‑end, unit runs under loaded condition.

Unloading state: Control air exhausts, spring pushes valve disc to close air inlet; meanwhile built‑in blow‑off port releases internal pressure, compressor switches to no‑load running.

Shutdown state: Check‑valve keeps closed position to prevent oil‑gas back‑flow.