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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.