Linearisation
that a transfer element with a non-linear characteristic curve is supplemented to such a degree by the addition of further transfer elements that a new transfer element emerges with an overall linear cha [...] characteristic curve (DIN 19 225). A comparable process is shown in ( Figure L 21 ), with the linearisation of a displacement transducer by means of two coils, S1 and S2, in a regenerative circuit.
Pressure-reducing valve (pressure control valve)
Q L in the secondary area. Pressure-reducing valve with secondary pressure limitation (three-way pressure-reducing valve) Pressure-reducing valve with a relief feature that prevents the pressure on the [...] Valve that keeps the (lower) outlet pressure (secondary pressure) p 2 constant even with changing inlet pressure (primary pressure) p 1 . This action is achieved by a valve cone, held open by a spring
HVLP oils
Short term for hydraulic oils with additives designed to provide protection against ageing, corrosion and wear and with viscosity improvement additives (Figure H 10) ; viscosity index: type 1: 125 to 190;
Conical piston
Pump piston with a spherical piston area which uses the piston rings provided for sealing purposes. The piston shaft — unlike the spherical piston — is conical in shape and is responsible for taking the [...] the Cardan-free cylinder drum with it (Figure K 4) .
Hand pump
pump — mostly with a single piston — for manual operation. It is single-acting in most cases, i.e. priming occurs during the first section of the cycle and delivery during the second. With double-acting
Error-tolerant computer
Computer with excess capacity, i.e. with redundant component configuration in which a replacement component becomes active as soon a part fails. Originally only used in large computers, today so-called
Two-line system
Accumulator drive system , which supplies its consumers via two pipeline networks, one with low-pressure and one with high-pressure, in order to save energy. In hydraulic systems, the low-pressure line provides
Digital technology
Collective term for the area of electronic processing and control technology that operates with digital signals with the characteristic that the numerical input signals in turn correspond to numerical output
HLPD oils
Non-standardised short term used for hydraulic oils with additives designed to provide protection against ageing, corrosion and wear, as well as an additive with emulsifying (dispersing) and detergent properties
Hardness of materials for seals
penetration by another. With materials for seals, this is measured as Shore A. For seals , the chosen degree of hardness would be a Shore A score of between 70 and 90. A material with a Shore A score of 98