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Variable pump which is adjusted by an electro-hydraulic closed circuit position control system according to the requirements of a parent control system such that it always moves an exactly defined flow

Pump block consisting of several individual pumps with a shared drive shaft. This is achieved by either arranging things axially in a row (where the shaft for the first pump has to transfer all the power)

External gear pump on which, for reasons of noise reduction, two pairs of gear wheels are used that are offset in relation to each other by half the tooth pitch. In this way the delivery flow pulsation [...] pulsation of, e.g., 14.3 % on a normal pump is reduced to 3.6 % (Figure D 88) .

The gear pump is a machine for conveying fluids in accordance with the Positive displacement principle . In principle it consists of three components: a housing with inlet and outlet and two gear wheels

Pump with two gear wheels in most cases whose outer (ring gear) has teeth on the inside. The inner sprocket is smaller. The fluid is conveyed in the spaces between the gaps in the teeth of the two gear [...] sprocket and ring gear (Figure I 11) . Their geometric displacement cannot be adjusted ( constant pump ). External gear pumps are also well suited for low-pressure drives and are an inexpensive alternative

Vane pumps operate according to the Positive displacement principle . The moving vanes, which are guided radially in a rotor and are supported in an eccentric stroke ring (stator), create an increasin

Special form of internal gear pump , in which no sealing sickle is required, as the seal between the fixed gear ring and the rotor (planetary gear) is directly possible through the suitable design of the

Pump with two or more gear wheels with teeth on the outside that rotate engaged in each other. As a result the hydraulic fluid is pressed out of the gaps between the teeth on the outlet side, while the

pumps the overall pump delivery flow can be adjusted to demand. Digital pumps are only used infrequently these days. Instead the easier to use but also more expensive variable pump is used with a delivery

Multiple pumps