Flow rate range of flow requirement
function of the pressure difference (inlet pressure minus outlet pressure): Q = f (p) under stated test conditions. temperature-controlled : Range between the minimum and maximum flow rate as a factor of [...] temperature of the hydraulic fluid at a constant pressure difference: Q = f ( t , p = const.) under stated test conditions.
Comparability
standardised framework conditions, and for freely selectable test procedures is the accurate reproduction of the selected framework conditions in the test protocol.
Voltage tolerance for solenoid valves
guaranteed given the maximum valve performance and at which the electrical actuation (under given test conditions) is still resilient under continuous operation.
Flow sensor with oval rotor assembly
Figure O 12 ). The flow sensor with oval rotor assembly operates with great precision. It is used on test benches in hydraulics.
Set pressure pe
312). On pressure-limiting and safety valves (DIN 3320): set pressure p e is the pressure at which in test stand conditions (atmospheric back pressure), directly actuated pressure-limiting valves start to [...] the pilot control starts to initiate the opening of the main stage. It is the response pressure in test stand conditions. In implemented systems the response pressure is at the set pressure. At the opening
Absolute filtration rating
through the filter. The expression should therefore only be used in conjunction with the glass bead test that only filter manufacturers use. It should however not be employed for users, as it will mislead
Pour point
Temperature at which the mineral oil still just flows under defined test conditions. It is somewhere between 6 and 8°C above the pour point . The pour point cannot be used to assess the characteristics
Wear protection capacity
are added (normally phosphate compounds). The wear protection capacity is determined by the Vickers test, in which the debris on a vane pump is measured under defined conditions.
Beta value (β value)
all parameters related to defining the β value must be stated, i.e. the complete test report. In ISO 4572 only the test procedure for particle size x = 10 μm is standardised. For all other particle sizes
Readily biodegradable fluids (hydraulic oils)
conditions in an environment containing water that continues as far as mineralisation (OECD screening test). The biodegradability, the pollution hazard for the ground and water, and the freedom from hazardous