Audible air escaping from muffler/vent well after the compressor has stopped.
1
Blowdown valve seat worn or debris on seat
Rotary screw
CheckWith unit stopped and pressure relieved (LOTO), inspect valve seat and poppet for wear/debris.
FixClean seat or replace valve seal kit.
SafetyBleed sump to 0 PSI and verify with gauge before disassembly.
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2
Check valve upstream of blowdown leaking, allowing continuous flow
Rotary screw
CheckIsolate and pressure-test the check valve independently if possible.
FixReplace check valve.
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3
Orifice in blowdown circuit oversized or missing
Rotary screw
CheckCompare orifice size to OEM parts diagram.
FixInstall correct OEM orifice.
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4
Solenoid valve failing to fully re-seat
Rotary screw
CheckCycle solenoid manually (de-energized) and check for full seating.
FixReplace solenoid valve.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.