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Hydraulic pump with constant geometric displacement V 1 for each revolution and therefore a constant delivery flow Q 1 at constant drive speed n 1: Q 1 = V 1 · n 1.

Multiple pump whose units supply separate circuits with a pressure-limiting valve because their working cycles overlap. If a constant pump is involved, the installed power will be equal to the total for

specific point (Figure E 11) . After adjustment such a pump operates like a constant pump . [...] Variable pump on which the geometric displacement can be set (limited) to a specific flow rate . This setting is made, e.g., by means of a stop screw that fixes the pivoting of the cylinder drum to a specific

Construction type of displacement pumps with multiple pistons, which, as in the radial piston pump, are arranged in a star shape around and perpendicular to the drive axis. They can be subjected to pressure [...] eccentric thrust ring. Movement beyond the zero position will reverse the flow rate direction ( reversing pump ). Pressurised from the outside (supported on the inside) : The pistons in the fixed cylinder block

Hydraulic pump with a to the pressure, the flow rate or the state variable of an actuator . Servo pump Also known as variable displacement pump. The reason for using a variable pump is to improve the [...] in particular if the consumer frequently operates with low flow rates. Unlike a constant pump, the variable pump only supplies the necessary flow rate. This means no excess flow rate returns to the tank

this device. As during this process the pump operates against the related system pressure, the resulting losses must not be underestimated. Here the losses in the pump often make up the major part of the losses [...] Device that sets the delivery flow of a variable pump to zero on reaching a set pressure such that this pressure is maintained in the system (Figure D 71) . This means that all internal and external pressure [...] response pressure can be pre-selected on a case-by-case basis (see Pressure-flow (p-Q) control of a pump ).

Hydraulic pump in which the pressure fluid is displaced by one or more pistons . Pistons may be arranged in a row or aligned radially or axially in relation to the drive shaft.

The torque M of a pump is calculated from the pressure p, the volume per revolution Vg and the hydraulic mechanic efficiency factor ηhm of the pump. Calculate the torque input of a pump directly and easily

product of the chamber volume, number of gears and rotation speed (Figure Z 1). The accuracy of the gear pump flow meter depends on the leakage in the gears; it is around ±0.5 % of the nominal flow .

moved in a linear manner such as a pump with banked pistons/in-line piston pump , displacement chamber pump, axial piston machine , radial piston motor, radial piston pump .