Directional valve
Fluid valve with binary behaviour, i.e. it moves from one switching position to another (e.g. Open – Closed) without adopting an intermediate position.
Micro-emulsion
droplets. Micro-emulsions are associated with a far higher degree of dispersion — even reaching the colloid dispersion range — than commercially available macro-emulsions. Micro-emulsions may only be used
Power section
the control of hydraulic systems is concerned, a distinction must be made — since the term " control " is rather a general one — between control in the signal range and control in the power section. The
Mounting wall
Valve assembly system in hydraulics whereby a mounting area for valves — to which the pipe is screwed from behind — is attached to the drive unit, while the valves are mounted from the front so they are [...] is how the pressure and delivery flow pulsation in the pressure fluid cause higher noise emissions at the wall, not to mention the large amount of space taken up, the extensive pipework and the many areas
Circulation losses in hydraulic systems
used for this ( b ), with the full flow rate always circulated - even in the case of variable pumps if they do not have p/Q feedback control - which is not always without losses, as in addition to the internal [...] operation, hydraulic systems normally need the pump to continue running even if its flow rate is not needed at that time, e.g. in the loading phase of a working cycle. The pump is then switched to circulation,
Frictional pressure
The differential pressure required to move a piston without an external load – i.e. to overcome the friction Differential pressure under defined conditions in the cylinder chamber.
Measuring instruments
Devices — located along the signal flow — which make up a measuring device and whose measuring characteristics (errors, chain of influences) are specific to the measuring device in question ( Figure M
Nozzle
cross-section constriction (e.g. rounded inlet edge) on which the smallest flow cross-section - unlike on the orifice - is within the geometric cross-section constriction. The pressure losses due to fluid friction
Pre-charge of seals
To that end either –– as in lip seals — the lips are designed to be undersized or oversized, which is then to be stretched or –– as in compact seals and O-rings — the seal body changes shape and is compressed
Available force
The effective force F 2eff at the piston shaft for a cylinder . This is derived from the piston area A and the pressure p, having subtracted the friction forces F 2R associated with the seals and guide