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ASCO™ 401 Air Slide Valve
The ASCO Series 401, also known as 8401, is a line of pilot-operated air slide valves designed for air and inert gas service in heating equipment applications.
The aluminum valves incorporate a unique sliding and sealing member that provides a durable and non-stick sealing method. Optional flow control regulates cylinder speed in either direction and permits adjustable Cv from 0.2 to 0.8.
ASCO™ 401 Air Slide Valve


Valve Actuation
Solenoid - Air Pilot
Body Material
Air, Inert Gas
Pipe / Port Size
1/4 "
Port Type
4 way - 5/2
From 0.5 Cv to 1.0 Cv, From .43 to .86 Kv
24 AC, 110 AC, 6 DC, 12 DC, 24 DC, 48 DC, 120 DC, 240 AC, 120 AC
Max Differential / Max Operating Pressure
Vacuum to 150 PSIG
Operating Environment
Indoor, Outdoor
Standards / Regulations
CSA, Type 1, Type 2, Type 3, Type 3S, Type 4, Type 4X, Type 6, Type 6P, Type 7, Type 9, UL


  • Dual solenoid versions hold last position, even after loss of electric power. Solenoid may be energized momentarily (1/10 second) or continuously
  • Standard manual operator both momentary and maintained
  • Sub-base and manifold mounting for installation flexibility; direct-mount constructions are available
  • Watertight Types 1, 2, 3, 3S, 4, and 4X and explosion-proof and watertight Types 3, 3S, 4, 4X, 6, 6P, 7, and 9 offer reliable operation in challenging environments


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