Objet de la recherche «fluides».

Device used to add heat to the hydraulic fluid. It is required where the temperature of the fluid should also be constant at the start of the operating period. The preheating normally takes place electrically

density of the pressure fluid p 1 - p 2 = pressure before the pressure resistance minus pressure after the flow resistance. The flow coefficient takes into account all losses due to fluid friction and turbulence [...] turbulence on flowing through the resistance. These losses appear in the energy balance as heating of the fluid. The flow coefficient is essentially dependent on the Reynolds number Re and the shape of the edge

Time that is measured between the hydraulic fluid entering the cylinder and the start of the piston movement.

Pressure created by flow resistances which must be overcome when feeding back the pressure fluid (to the tank).

connected to the intake port of a hydraulic pump or compressor and permits the transport of hydraulic fluid.

Device that indicates the absolute pressure at a measuring point in a hydraulic fluid, referred to a perfect vacuum.

barometric pressure of a column of fluid (Figure F 23) . They are only suitable for measuring low pressures or differential pressures. Alcohol, water or mercury is used as the fluid. Vertical column pressure gauges

contains an electrical switch, the contact of which is actuated at a given flow of the hydraulic fluid.

pascal: 1 Pa = 1 N/m2. In fluid technology p is mostly stated in bar (1 bar = 105 N/m2). However, MPa (106 N/m2) is also used. Pressure figures, if not otherwise stated, in fluid technology are to be understood [...] pressure as the reference variable. The pressure of a medium is one of the most important parameters in fluid technology. It occurs, as shown, in numerous variants that each have a specific significance for the

Contact seals for fluid technology are predominantly manufactured from polymer materials in the group "elastic materials". The most important characteristics of these materials are their elasticity (adaptation [...] n to unevenness and to changing pressure), hardness (wear behaviour), resistance in the pressure fluid (swelling behaviour), sliding and friction behaviour, wear resistance among others. The elastic materials [...] thermoplastics for special tasks. Metal materials have become significantly less important for seals in fluid technology. Occasionally there are piston rings and sealing rings made of soft metals that must be