Stanley MB556 - DEFINITIONS; Hydraulic Terminology

MB556 User Manual ◄ 25
DEFINITIONS
Tool: The hydraulic attachment which the auxiliary circuit is intended to power. These
may include hydraulic breakers, compactors, shears, etc.
Operating Pressure: That pressure at which the tool will naturally operate without inuence of outside
pressure relief mechanisms. This pressure is an operating characteristic of the tool
and cannot be altered by the end user without changing the tool design.
Relief Pressure: The relief pressure is that pressure at which the circuit will dump uid in order to
protect itself from damage.
Back Pressure: The pressure at the tool’s connection to the return circuit of the carrier.
Flow Meter: Instrument for testing the operating characteristics of a hydraulic circuit. The data
usually available from this device are pressure (psi/bar), ow (GPM/LPM) and
temperature (°F/°C).
Restrictor Valve: A valve on the ow meter which allows the user to simulate an operating tool by
adding a pressure load (through restriction) to the circuit. This feature is used to
evaluate relief settings and ow ratings at pressure.
V60/V65/V100 Valves: A priority ow control valve manufactured by STANLEY. Allows for optimum opera-
tion of any attachment by providing the proper amount of ow for operation of
the tool the “priority” aspect allows the attachment to function properly if another
control function is activated.
Inlet Flow: The hydraulic oil supplied to the “IN” port of the tool or valve.
Regulated Flow: The ow of oil supplied to the tool by the V60/V100 valve.
By-Pass Flow: The oil ow that is supplied by the carriers pump, but not used in the operation of
the attachment. By-pass ow equals inlet ow (to the valve) minus the regulated
ow.
Pressure Line: The hydraulic line(s) which supply pressurized oil from the pump to the valve or
tool.
Return Line: The hydraulic line which connects the “OUT” port of the tool to the tank circuit of
the carrier.
Cracking Pressure: The pressure at which the relief valve starts to open. Can be seen by a drop in the
ow rate as shown by the ow meter.
Full Open Pressure: The pressure at which the relief valve is completely open dumping all system ow
to the tank.
Ambient Air Temperature: The temperature of the outside air.
Stabilized Temperature: The temperature at which the carrier hydraulic system temperature will stop rising
during testing or operation.