Operation
56 Series 505G2 SilentFlo™ Hydraulic Power Unit
High pressure
When the Series 505 HPUs are running in high pressure, a considerable amount of heat is generated.
During normal testing, this heat is dissipated by running the hydraulic fluid through the system from the
return line to the heat exchanger. During periods of low system demand, this heat is dissipated by
running the hydraulic fluid through the auto-cooling circuit to the heat exchanger.
Auto-cooling
The Auto-Cooling Valve is adjusted such that the shift between valve closed and valve opened occurs
just below the output pressure level. Whenever system pressure is above the shift level of the Auto-
Cooling Valve (indicating low system demand), the valve opens to port hydraulic fluid through the
return filter to the heat exchanger. When system pressure drops below the shift level (indicating an
increase in system demand), the valve closes and full flow is available to the system.
The effective operating range of the auto-cooling circuit is between system pressures of 14 MPa (2000
psi) to 21 MPa (3000 psi). In order for the Auto-Cooling Valve to function properly, it must be re-
adjusted anytime the output pressure will be changed for longer than 10 minutes.
Note: If the test condition requires a maximum pressure level less than 14 MPa (2000 psi),
consult MTS.
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