Kaeser Y1 load / venting solenoid

Sigma Control-operated pilot valve for the inlet valve and venting on ASD/BSD/SK/SM units.

Also called: Y1 · Sigma Control load valve

How it works

Sigma Control energises Y1 to pressurise the inlet valve control chamber and simultaneously close the venting path. On unload Y1 drops and the sump vents through the venting valve down to about 2 bar residual.

Coil resistance (typical, cold DC)

Typical values for the stated wattage class. Always compare against the coil tag. Open circuit = burnt winding; near 0 Ω = shorted turns.

Specifications

Control voltage

Follows the panel transformer — check the machine wiring diagram sheet

Connector

DIN 43650-A

Parts you can order

• Kaeser (OEM)

  Load solenoid / venting valve

  Serial-specific (Kaeser Parts portal)

  $160 – $500

Field test procedure

1. Sigma Control: I/O test screen forces the Y1 output — the cleanest way to separate a controller fault from a coil fault.
2. Ohm the coil against the tag wattage; replace coil only.

Symptoms & probable causes

• Machine cycles rapidly load/unload
  Pressure band too narrow or the venting valve leaks back into the sump.
• Oil blown out the intake on shutdown
  Inlet valve non-return failed, or Y1 vented while the inlet stayed open.