Parker Hydraulic Group
NSD20 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 and Power Beyond Port For the Unloaded Pump

This system consists of a tandem pump and unloading valve with the unloading valve being sensitive to pump speed. The system has primary and secondary discharge ports such that both pumping sections are diverted to the primary port at low pump speeds. At an intermediate pump speed the rear pump section is metered from the primary port and a portion is diverted to the secondary port. At a predetermined higher speed, the rear pumping section is completely diverted to the secondary port while all of the front pumping section flow is maintained at the primary port.

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