PSI-Polymer Systems

Hydraulic Power Unit (HPU)

Hydraulic Power Unit for Polymer Extrusion Screen Changer Melt Filter

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PSI Hydraulic Power Units (HPU) provide the power to actuate hydraulically operated screen changers and divert valves.  Depending on the functional demand, HPUs are provided with pressure accumulators for a rapid change, or without an accumulator when a steady flow of pressure suffices to operate the system.  A single HPU can be arranged to operate multiple devices, either hard plumbed or with quick-disconnects.  HPUs are designed to operate with petroleum-based fluids and can optionally run water glycol.

HPU-15.0A Hydraulic Power Unit

Specifications

Hydraulic fluidAW-32 or equivalent
Viscosity index90+
Relief pressure3,000 PSI
Operating temp. (max.)120°F [49°C]
Pump typeGear
Accumulator style HPU:
Pressure switch2,700 PSI
Accumulator pre-charge1,400 PSI*
* HPUs with accumulators shipped by air freight have zero pre-charge. In these cases, the customer is responsible for charging the accumulator to the required pre-charge pressure before starting the system.
HPU ModelScreen Changer TypePump GPMMotor HpReservoir (Gal)Accumulator Vol. (Gal)Accumulator Type
HPU-0.4SCSC/DSC0.40.7510NANA
HPU-0.9SCSC/DSC0.9210NANA
HPU-1.2SCSC/DSC1.2310NANA
HPU-1.8SCSC/DSC1.8510NANA
HPU-2.7SCSC/DSC2.77.520NANA
HPU-4.2SCSC/DSC4.21020NANA
HPU-6.5SCSC/DSC6.51520NANA
HPU-8.5SCSC/DSC8.52030NANA
HPU-1.8S/0.5ACSC-BF1.85200.5Piston
HPU-2.7S/0.5ACSC-BF2.75200.5Piston
HPU-4.0S/1.0ACSC-BF47.5201Piston
HPU-1.5AHSC1.82101.5Piston
HPU-2.5AHSC1.83102.5Piston
HPU-5.0AHSC2.75205Piston
HPU-10.0AHSC3.17.53010Bladder

Features

  • Simple start-stop switch
  • Interlock prevents operation if device guards are open
  • System pressure relief valve prevents over-pressurization
  • Easy-to-read system pressure gauge
  • Control panel mounted to HPU
  • Reservoir includes oil level and temp gauges, breather cap filter and sump strainer

Accumulator Models

  • Piston accumulator through HPU-5.0A
  • Bladder accumulator for large HPUs
  • Auto-dump solenoid valve relieves system pressure when power is off or disrupted
  • Anti-restart relay prevents automatic restart after power loss
  • Controls wired for 115V with control transformer included
  • Interlock prevents operation unit if pressure ready is not met
  • Accumulators rated for 3000 psi
  • Check valve – holds pressure after pump shuts off

Non-Accumulator Models

  • Controls wired for 24VDC with power supply
  • Return filter

Options

  • Special power-frequency for motor and controls
  • Manifolds for multi-screen changer operation
  • High-pressure hydraulic hoses
  • Water Glycol in lieu of petroleum-based fluid
  • Accumulator models:
    • Bladder accumulators
    • Nitrogen gas recharge kits 
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