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essentially defined by the programming of the computer (CNC system program = sequence of statements with which the system functions are defined) (DIN 66 257). Today the CNC has largely replaced the conventional

Seal combination comprising a ring made of wear-resistance material (mostly filled PTFE) with a smooth or recessed edge sliding surface that is energised by an O-ring behind it (Figure G 27) . The somewhat

Hydraulic power pack, consisting of a hydraulic pump and a large Filter with a fineness of 10 or 25 μm, which is used in the main flow to remove the built-up dirt in a hydraulic system before it is actually

Directional valve with a second tank connection. This design was very popular for a long time, as on the one hand it was possible to place different loads on the two connections and on the other hand special

must be selected according to the largest flow rate present. This occurs when refluxing a cylinder . with A K = piston surface area, c R = return velocity.

out the air can then flow in again unhindered. This means a damping seal should have the action of a with a defined leakage.

of the operating period. The preheating normally takes place electrically using heating cartridges with a low specific heat performance (max. 2 W/cm2 for heating rods and 0.5 W/cm2 for heating cartridges)

value of a physical variable — the measured variable — by means of an indirect or direct comparison with a known reference variable. Measuring requires a master reference element and a device for reading

the outlet (to approx. 5 bar min.). Example: A valve pilot-controlled by a directly controlled valve with internal pressure tap.

Behaviour of a binary element or circuit associated with a stable state whereby a corresponding signal change at the input is needed to take the element out if its stable state for a specific period of