Alcon Solenoid Valves: Selection, Wiring and Maintenance Guide
What Is an Alcon Solenoid Valve?
An Alcon solenoid valve is an electromechanically actuated valve that uses a solenoid coil to open or close the flow path. Models such as the 18E11 series are compact 2/2 or 3/2 way direct-acting or pilot-operated valves widely used for air, inert gas, water and light oil control in industrial automation, packaging and process skids.
Key Selection Criteria
Way / function: 2/2 (on-off), 3/2 (divert/exhaust) or 5/2 for double-acting actuators. Confirm whether you need normally closed (NC) or normally open (NO).
Port size and thread: Match the line size (e.g. G1/8, G1/4, G3/8) and confirm ISO or NPT threading.
Media compatibility: Verify the seal material (NBR, FKM, EPDM, PTFE) against the fluid. NBR suits air and water; FKM is better for oils and higher temperatures.
Pressure range: Check minimum operating pressure (direct-acting valves work from 0 bar) and maximum working pressure.
Voltage and duty: 24 V DC and 24/110/230 V AC are common. Use 100% ED (continuous) coils for always-on service.
Manual override: A manual pin is useful for commissioning and fault isolation.
Installation Best Practice
Mount the valve with the coil upright where possible and protect it from direct water spray unless rated IP65+.
Fit a 5–100 µm line filter upstream to prevent debris from sticking the armature.
Observe the flow arrow on the body; reversing supply/exhaust on a 3/2 valve will invert the action.
Use a surge-suppression diode (DC) or RC snubber (AC) at the PLC output to extend coil life.
Commissioning and Maintenance
Energise the coil and confirm audible click and flow change. If the valve fails to shift, check supply voltage at the coil, inlet pressure and cleanliness of the orifice. Periodic maintenance is minimal: blow out the line during shutdowns and replace seals if external leakage appears. Coils are field-replaceable without removing the valve from the manifold.
Troubleshooting Quick Reference
Coil hot but no shift: pressure below minimum, blocked orifice, or stuck armature — clean and re-test.
Valve passes in closed state: worn seal or particle on seat — service seal or flush line.
Intermittent operation: poor electrical connection or missing suppression — check terminals and add diode/snubber.
Why Source Through EFFSEN
EFFSEN stocks Alcon solenoid valves and supplies the matching coils, connectors and manifolds, with real-product photos and datasheets so you can verify the exact configuration before ordering.