The continuous blowing of the solenoid valve of the baghouse dust collector is essentially caused by abnormalities in three links: the electromagnetic system,
mechanical components, and control system, which prevent the valve from resetting and closing properly.
Electromagnetic System Malfunctions
Coil Abnormalities: Short circuit, burnout, or insulation failure caused by moisture of the coil will keep the solenoid valve energized continuously, making it impossible
to power off and close normally, thus triggering continuous blowing.
Pilot Head Sticking: After the electrical signal disappears, the movable column of the pilot head is stuck by burrs or impurities and cannot reset, remaining in the open
state all the time.
Sticking/Damage of Mechanical Components
Spool Stagnation: Impurities such as dust and rust enter the valve body and get stuck between the spool and the valve body, or the spool deforms due to long-term
wear, failing to return to the position normally to shut off the air circuit.
Diaphragm/Seal Failure: The diaphragm suffers fatigue damage and loses elasticity due to aging, or foreign matters are trapped in the sealing gasket, making it
impossible to block the air circuit. The air will continue to jet even if the coil is powered off.
Spring Failure: The return spring of the spool has fatigue elasticity or breaks, losing the reset thrust, which prevents the spool from returning to the closed position.
Throttle Hole Blockage: The compressed air is not clean, and impurities block the damping hole. The upper chamber of the diaphragm cannot build up pressure
normally to reset, so the main air circuit remains continuously open.
Control System Abnormalities
Control Circuit Faults: Loose circuit connectors or short circuit caused by damaged insulating layer will result in the failure of shutdown signal transmission, and the
solenoid valve will continuously receive the blowing command.
Controller Faults: Program logic error or hardware damage of the pulse controller will make it continuously output blowing signals to the solenoid valve, failing to send
the normal shutdown command.
