Scraping seal
an angled metal ring is vulcanised into the seal to improve the seating of the ring. In this way it can be secured axially with the aid of a circlip.
Sealing compatibility index (DVI)
Parameters for the behaviour of elastomer materials in different hydraulic fluids that can range from shrinkage, through slight swelling, to complete dissolution of the elastomer. If the DVI of the intended
Sampling error
arises if continuously changing variables are measured by digital means because the measured values can only be measured at specific times due to the finite time required for the A/D conversion . The change
Current-fed system
speed or stroke rotation speed is bound by the pump delivery flow . Due to this current feed, a pump can only ever actuate one drive unit. It is only possible to drive several units if they are functionally
Intrinsically safe
1. Term from electrical engineering: An intrinsically safe device has a power level so low that it can be used in potentially explosive atmospheres. 2. Machine controls are intrinsically safe if, in the
Setting point
Temperature, at which a liquid can no longer flow under the effect of its own mass when cooled down under defined conditions. In the course of adapting to international standards, the setting point was
Programmable control
random access memory (RAM) as program memory ( semiconductor memory ) the entire contents of which can be changed, even only slightly, without mechanical intervention in the control device. Mechanical
NBR
Acrylonitrile butadiene rubber. The acrylonitrile component can be anything between 18 and 50%. Numerous seals for hydraulic and pneumatic devices are made from this synthetic rubber, including radial
Braking valve
prevents a pulling load adopting an uncontrolled velocity. This problem occurs if the work equipment can run away from the inlet oil flow. To prevent this situation arising pressure that is sufficient to
Volume reduction on pressure increase
pressure Δp is increased. The factor is the reciprocal of the Kompressionsmodul K. The value of K can be assumed to be 1400 MPa for a hydraulic fluid. Calculate the volume reduction on pressure increase