30 GPM Internal Bypass Relief Valve Pump – Tri-Rotor Model 20DX

  • Tri-Rotor Bypass Head Pump Model 20DX
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Tri-Rotor Pump model 20DX, along with model 20CPX, is the smallest in the family of Tri-Rotor bypass head pumps that incorporate an internal relief valve and provide constant flow rates.  This pump is designed to protect discharge piping and equipment from excessive pressures.  The pump serves a wide range of industrial markets and applications.  Examples of the 20DX model’s diverse applications include pumping tallow, lube oil additive, thixotropic clay slurry, petroleum aromatic pitch, corrosion inhibitor, mineral oil, and coal mill oil.

The pump is designed with side suction and top discharge threaded ports and is available in both clockwise (CW) and counterclockwise (CCW) rotations for pump installation flexibility.  Materials of construction for the 20DX model include Iron Fitted, All Iron, Bronze Fitted, or All Bronze configurations.  One feature of the pump is that the shaft housing (or stuffing box) is integrated into the pump body, reducing the number of parts and the time required for maintenance.

Specifications of Tri-Rotor Pump Model 20DX:
  • Flow rate:  4 to 30 GPM
  • Viscosity range:  4 to 21,625 cPs (40 to 100,000 SSU)
  • Inlet and Discharge Port size:  1-½” NPT Ports (std.) or 1-¼” NPT Ports
  • Operating temperature range:  -40 °F to 650 °F
  • Maximum operating pressure:  100 PSI
  • Pump displacement per revolution:  0.0176 gal/rev
  • Pump speed range:  240 to 1800 RPM
  • Solids passage available:  0.023 in.
Do you know your system parameters and would like us to quote the best pump model?  Please fill out the Pump Systems & Analysis Sheet.
Configure Your 20DX Bypass Head Pump
Part Number:
20DX
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As with all Tri-Rotor pump models, the 20DX is available with a Steam Jacketed option for fluids requiring to be heated or cooled in order to be pumped.  Tri-Rotor also offers an interesting option for its’ 20DX bypass head design: a Reduced Stroke Pump Head.  With this option, the pump can be designed to target a specific flow rate at a percentage of full flow.
 
Other Options for Pump Model 20DX:
  • Other Materials of Construction options:
    • Shaft:  Steel (std.), Stainless Steel, or Hardened Stainless Steel
    • Piston:  Iron (std.), Bronze, or Steel
    • Bypass Head Gasket options:
      • Standard  {to 250 °F (121 °C)}
      • Heat Resistant  {to 650 °F (345 °C)}
  • Shaft length:  “M” (8-3/8”) (std.), “T” (8-3/8”), “MO” (10-13/16”), or “BD” (10-13/16”)
  • Shaft seal and lubrication:
    • Packing options (grease fitting provided):
      • Teflon Impregnated Packing (std.)  {to 550 °F (288 °C)}
      • FDA Food Grade (PTFE) Packing  {to 500 °F (260 °C)}
      • Heat Packing  {to 650 °F (345 °C)}
      • Zero-Leak #3 (Beaded) Packing  {-40 °F to 500 °F (-40 °C to 260 °C)}
      • Zero-Leak #30 (Non-Beaded) Packing  {-40 °F to 500 °F (-40 °C to 260 °C)}
    • Mechanical seal options (grease fitting provided):
      • Type 1 Mechanical Seal – Viton  {-40 °F to 300 °F (-40 °C to 150 °C)}
      • Type 1 Mechanical Seal – Buna  {10 °F to 180 °F (-10 °C to 80 °C)}
      • Type 9 Mechanical Seal – PTFE  {to 320 °F (160 °C)}
  • Bypass Head Spring options:
    • Standard  {to 60 PSI}
    • Heavy Duty  {to 100 PSI}
    • Heavy Duty Hi Temp  {to 100 PSI}
  • Shuttle design:  Formed Shuttle only
  • Relieved Rotor Group (for higher viscosities: >10,000 SSU/2,150 cPs)
  • Sanitary Preparation of pump internal components for food applications
  • Grease feeder available for shaft lubrication
  • Exterior Protection:  Orange Paint (std.), Black Paint, White Lacquer, or 316SS Epoxy Coating
The bare weight of the pump is approximately 21 lbs.  The estimated shipping weight is 27 lbs.

Besides offering just a bare pump only for the Model 20DX, Tri-Rotor offers a complete mounted pump system, including motor drive assembly and mounting.  Replacement parts for all Series 20 pumps can be found here.