ASCO 8320 series 3-way pilot solenoid

The industry-standard 3-way general-service pilot valve used as a drop-in load/unload solenoid on many packages.

Also called: 8320G174 · red hat 3-way · universal pilot valve

Universal body — the piping determines NO or NC operation. Mark the ports before removing the old valve.

How it works

Direct-acting 3-way universal valve. Pressure can be applied to any port, so it can be piped normally closed, normally open, or as a diverter. Common replacement when an OEM pilot valve is obsolete.

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

Orifice

3/32" – 1/4"

Max operating pressure differential

Up to 150 PSI air (body dependent)

Body

Brass or stainless, 1/4" NPT

Coil class

F, continuous duty, epoxy encapsulated

Parts you can order

• ASCO (Emerson)

  Series 8320 3-way general service

  8320G174

  $130 – $260

Field test procedure

1. Ohm the coil per the voltage table — an AC coil measured with the plunger removed reads normally but will buzz and overheat in service.
2. AC coils burn if the plunger cannot seat: always fit the correct core/spring kit, not just a coil.

Symptoms & probable causes

• Loud AC hum
  Shading coil damaged or plunger not seating — replace the core assembly.
• Valve stays open after de-energising
  Debris on the seat or a bent core spring.