ASCO Numatics 521 Series Mini-Spool Valves

Brand: ASCO

The ASCO Numatics Series 521 is a line of solenoid air-operated, mini-spool valves that are ideal for piloting pneumatic cylinders.

The valves have high-quality coils resistant to heat and moisture and suitable for high ambient temperatures and harsh environments. They can be mounted on joinable subbases for manifold applications.
  • Anodised aluminium G1/4-tapped body with NBR seals for extended service life
  • Non-breathing construction where the spring return chambers of the single- or double-acting actuator are collected with the solenoid valve exhaust
  • Handles lubricated or non-lubricated air or neutral gas
  • Ambient temperature range 5° C to 50° C
  • Satisfies all relevant EU Directives



Body Material

  • Aluminum


  • Over 12 Kv


  • 5/2, 5/3

Maximum Differential, Maximum Operating Pressure

  • Vacuum to 10.3 bar, Vacuum to 150 psig


  • Air, Inert Gas

Pipe / Port Size

  • 1/4

Port Type

  • G ISO 228 / 1-G BSPP

Standards & Regulations

  • UL

Valve Actuation

  • Solenoid, Solenoid - Air Pilot


  • 115 AC, 230 AC, 24 AC, 24 DC
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