21 Vacuum Series




  • Poppet construction for high dirt tolerance
  • ROSS vacuum valves have larger orifices, allowing greater flow and easing the transport of air even though there is a small differential between the vacuum within the valve and atmospheric pressure outside the valve
  • Can be mounted close to actuator, reducing length of pipe to be pressurized/exhausted on each cycle
  • Internal/external pilot supply
  • Near zero leakage


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Product Information

Description 21 Series Vacuum Valve, 3/2 Single Pilot, Normally Closed, 1-1/4" NPT (In-Out), 1-1/2" NPT (Exhaust)
Valve Type Directional Control
Series 21
Application Vacuum
Actuation Pneumatic
Default Position Normally Closed
Return Spring
Thread Type NPT
Construction Poppet
Mounting Inline
Pilot Type External
Manual Override Not Included
Ambient Temperature -40 to 175 F (-40 to 80 C)
Ambient Temperature (Celsius) -40 to 80
Media Temperature -40 to 175 F (-40 to 80 C)
Media Temperature (Celsius) -40 to 80
Fluid Media Filtered air
Operating Pressure Vacuum to 150 psig (vacuum to 10 bar)
Operating Pressure (bar) Vacuum to 10
Pilot Supply Minimum Equal to or greater than inlet pressure
Valve Body Material Aluminum
Poppet/Spool Material Aluminum and Stainless Steel
Seal Material Fluorocarbon
Function 3/2 Single Pilot
Exhaust Pipe Size 1-1/2"
Cv (2-3) 39.0
Length 6.63 in (168 mm)
Length (mm) 168
Height 7.49 in (190 mm)
Height (mm) 190
Weight 11.0 lb (5.0 kg)
Weight (kg) 5
Inlet Pipe Size 1-1/4"
Outlet Pipe Size 1-1/4"
Size 1-1/2
Width 4.84 in (123 mm)
Width (mm) 123
Cv (1-2) 29.0
Weight 11.0 lbs (4.99 kg)
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