Series 450RC Recirculating Valve

The 450RC valve allows continuous flow of material. Typical uses are for heated materials or materials with fillers that need to remain suspended. Gear pump applications can also benefit from the recirculating valve as pumps can be kept running while material is shut off at the mixer.

Recirculation occuring at the valve instead of the pump eliminates pressure buildup in the lines, preventing off-ratio dispensing. The valve also incorporates a snuff-back feature that minimizes or eliminates the possibility of material dripping or stringing when the valve shuts off.


  • Dispenses two-component adhesives and sealants
  • Dispenses low- to high-viscosity urethanes, epoxies and silicones
  • Adjustable snuff-back prevents dripping
  • Can be mounted for beads or timed shots; optional handle is available for handheld applications
  • Provides an ON-OFF function. The metering of the adhesives in the proper ratio of A:B is controlled by the metering pumps.
  • Flow rates of 2-3 gallons/minute, depending on pump and material viscosity
  • Materials remain separate until they enter the mixer
  • Available in aluminum or stainless steel configurations
  • Manual, robotic or stationary operation.


  • Valve
    • Size: 5.2“ X 2.5“ X 2.3“ (132mm X 63.5mm X 58.4mm)
    • Body Material: 6061-T6 Aluminum or 303 Stainless Steel
    • O-ring Options*: Viton®, PTFE, Ethylene-Propylene (E-P)
    • Lip Seal Options*: Viton®, Polyurethane (PU), PTFE,
      Polytuff, Ethylene-Propylene (E-P)

      * Repair kits containing a complete set of lip seals and O-rings are available.
  • Manifold
    • Size: 1.9“ X 2.5“ X 1.5“ (48.3mm X 63.5mm X 38.1mm)
    • Material: 6061-T6 Aluminum or 303 Stainless Steel
    • Options: 1:1 Ratio (with or without solvent check valve)
      Wide Ratio (with or without solvent check valve)
  • Weight
    • Aluminum Valve and Manifold: 2.0 lb (0.9 kg)
    • Stainless Steel Valve and Manifold: 3.4 lb (1.5 kg)
  • Operating Parameters
    • Min. Operating Pressure: 80 psi (5.5 bar)
    • Max. Fluid Pressure: 3500 psi (240 bar)
    • Electric Handle Mount Switch: 24V

Related Products

Series 160 Disposable Plastic Spiral Bell MixerSeries 160 Disposable Plastic Spiral Bell Mixer

Nordson EFD's spiral bell mixer keeps reactive materials separate until they are intended to mix, unlike conventional meter/mix manifolds, where the reactive materials meet within the manifold before the mixer.

Series 100 Spiral Pipe MixersSeries 100 Spiral Pipe Mixers

Nordson EFD's Series 100 spiral pipe mixer is a stainless steel mixer, built to be rugged and reliable.