Synchronizing cylinder
Double-acting cylinder with two piston rods. The velocity is the same in both directions if both piston rods are the same thickness and the same flow rate acts on both piston areas. ( Hydraulic cylinders
Gas filling pressure
Gas pressure that is applied to a fluid vessel with or without separator. On hydraulic accumulators the gas filling pressure corresponds to the precharge pressure. Example: hydropneumatic accumulator
Nominal width
previously used instead of " nominal size " to indicate a device size. 2. Standardised numerical variables with which the inside diameter of pipes is compared. The nominal width for pipes is defined in DIN 2402
Pressure gain on continuously adjustable valves
pressure-signal function , e.g. 2,000 bar/mA. It is crucial for the accuracy that can be achieved with a controller.
Load flow Q L
Flow through a valve as determined by a given load and a specific signal. With continuously adjustable valves , the load flow is described in terms of the flow rate load function Q L=f(y,pL).
ISO
standards institutes whose technical committee TC 131 works on all standardisation tasks associated with fluid technology. The resulting ISO standards are either adopted directly (DIN ISO ...) or incorporated
Impeller
Hydraulic pump which operates in accordance with the hydrodynamic principle (centrifugal pump) and is used as a filling pump for hydrostatic pumps, particularly variable pumps (Figure I 3) . Advantage:
Adhesive joint of pipes
Adhesives are increasingly being used for permanent installations of plastic pipes, with one end of the pipe being widened into a sleeve to ensure there is a long enough area to accommodate the adhesive
Opening/closing pressure difference
Hysteresis for pressure valves resulting from springs, the mechanical friction associated with the piston and flow forces. It ensures the closing pressure for a pressure valve is always lower than the
Displacement volume
output volume or flow rate Of a cylinder Geometric volume based on piston area and piston stroke. With differential pistons, the volume at the rear would have to be added.