Parker Hydraulic Group
NST20 Series Flow-Sensitive Unloading Gear Pumps

Key Features

  • Flows to 98 GPM per section
  • Tandem & triple section units available
  • Pressures to 2500 PSI
  • Speeds to 2500 RPM
  • Pressure & flow sensing valves available
  • Dry valve option
  • Piggy back option available
  • Also available as motor
  • Cast iron versions available
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Tandem Pump with Flow Sensitive Unloading Valve At low pump speeds the flow from both pump sections is to the circuit. As speed increases, the rear pump section begins to bypass internally to the inlet of the front pump section. After approximately a 400 RPM spread, the rear pump is completely bypassing and only the flow of the front pump is to the circuit. The bypass set point is field adjustable within approximately ±200 RPM.

Description ...................... Flow-Sensitive Unloading Gear Pumps
Combined Flow Range ...... To 98 GPM Per Section (370.9 LTR.)
Displacements ... To 9.10 C.I.R Each Section (149.12 CC’s/REV.)
Maximum Pressure to ...................................... 2500 PSI (172 BAR)
Maximum Speed to ........................................................... 2500 RPM
Rotation ......................................................................................A or C
Bearings ................................................................................... Journal
Construction .......................................................................Aluminum