4300 Vertical In-Line Pumps

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4300 Vertical In-Line (VIL) pumps
4300 Vertical In-Line (VIL) pump - FrontView
4300 Vertical In-Line (VIL) single pumps

  • Summary
  • Applications

    HVAC-system pumping; light industrial/ process pumping (water or glycol based)

  • Description

    The Armstrong 4300 pipe-mounted pumps are designed for space-saving installation, high operating efficiency, and long service life

  • Materials
    • Cast, ductile iron or bronze casing 
    • Cast iron or bronze impeller
  • Configuration

    Outside balanced or inside single spring mechanical seal

  • Performance range

    Up to 28,000 USgpm (1,800 L/s) flow; up to 500 ft (150 m) head

  • Temperature

    300oF (150oC)

  • Power Range

    1 hp to 1250 hp (0.75 kW to 900 kW)

  • Size

    1.5" to 20” (40 mm to 500 mm)

Low installed cost

  • Vertical In-line design eliminates the need for inertia bases, housekeeping pads, flex connectors, and field alignment or grouting requirements
  • Vertical In-line design minimizes space and pipe requirements
  • Isolated mechanical seal design with optional sediment filters or separators available to extend seal life in contaminated systems

Low energy consumption and operating cost

  • Armstrong 4300 pumps are available with high-efficiency NEMA-premium motors for significant reduction in energy consumption and cost
  • All motors are suitable for inverter-fed service
  • Vertical In-line design minimizes pipe requirements and related friction losses resulting in higher system efficiency
  • Split-coupling allows replacement of mechanical seal without disturbing the pump or motor
  • No lubrication or seal adjustments required



Low operating risk

  • Universal replacement seals, bearings, and motors available locally world-wide
  • Optional isolated mechanical seal with sediment filters or separators for extended seal life in contaminated systems
  • Vertical In-Line configuration allows for less disruptive pump service (casing stays in place)

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