4270 & 4270 Stock Motor Mounted Pumps

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4270 Stock Motor Mounted Pump
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4270 & 4270 stock motor mounted pumps Line drawing

  • Summary
  • Applications

    Building services – Cooling towers, HVAC, general purpose

  • Description

    The Armstrong 4270 close coupled horizontal pumps are motor mounted and designed for long service life and easy maintenance.

  • Materials
    • Cast iron with ULTEM impeller
    • 416 stainless steel shaft
  • Configuration
    • Inside single-spring mechanical seal.
    • Bronze-fitted.
    • Designed for 3,600 RPM (1,800 RPM optional)
  • Performance range

    Up to 3,600 USgpm (227 L/s) flow; up to 130 ft (40 m) head

  • Temperature

    275°F (135°C)  

  • Power Range

    0.33 hp to 60 hp (0.25 kW to 45 kW) 

  • Size

    1.25", 1.5”, 2” (32 mm, 38 mm, 51 mm)

Extended durability and service life

  • High-strength resin impeller minimizes axial thrust, ensuring smooth performance and long life 
  • Permanently lubricated, heavy-duty motor ball bearings accommodate radial loads and residual hydraulic thrusts 
  • Self-lubricating mechanical seal prevents liquid seepage 
  • Aluminum die cast adaptor with integral support foot delivers lightweight and durable construction



Easy and cost-effective servicing

  • Radially-split volute can be left in the line while servicing the pump, eliminating needless disconnecting of pipes 
  • Back pull-out design eliminates the need to break piping connections when servicing the pump
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4270 Stock Motor Mounted Pumps - stock brochure

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