Hydraulic Power Unit (HPU)
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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.
Specifications
| Hydraulic fluid | AW-32 or equivalent |
| Viscosity index | 90+ |
| Relief pressure | 3,000 PSI |
| Operating temp. (max.) | 120°F [49°C] |
| Pump type | Gear |
| Accumulator style HPU: | |
| Pressure switch | 2,700 PSI |
| Accumulator pre-charge | 1,400 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 Model | Screen Changer Type | Pump GPM | Motor Hp | Reservoir (Gal) | Accumulator Vol. (Gal) | Accumulator Type |
| HPU-0.4S | CSC/DSC | 0.4 | 0.75 | 10 | NA | NA |
| HPU-0.9S | CSC/DSC | 0.9 | 2 | 10 | NA | NA |
| HPU-1.2S | CSC/DSC | 1.2 | 3 | 10 | NA | NA |
| HPU-1.8S | CSC/DSC | 1.8 | 5 | 10 | NA | NA |
| HPU-2.7S | CSC/DSC | 2.7 | 7.5 | 20 | NA | NA |
| HPU-4.2S | CSC/DSC | 4.2 | 10 | 20 | NA | NA |
| HPU-6.5S | CSC/DSC | 6.5 | 15 | 20 | NA | NA |
| HPU-8.5S | CSC/DSC | 8.5 | 20 | 30 | NA | NA |
| HPU-1.8S/0.5A | CSC-BF | 1.8 | 5 | 20 | 0.5 | Piston |
| HPU-2.7S/0.5A | CSC-BF | 2.7 | 5 | 20 | 0.5 | Piston |
| HPU-4.0S/1.0A | CSC-BF | 4 | 7.5 | 20 | 1 | Piston |
| HPU-1.5A | HSC | 1.8 | 2 | 10 | 1.5 | Piston |
| HPU-2.5A | HSC | 1.8 | 3 | 10 | 2.5 | Piston |
| HPU-5.0A | HSC | 2.7 | 5 | 20 | 5 | Piston |
| HPU-10.0A | HSC | 3.1 | 7.5 | 30 | 10 | Bladder |
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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