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The base oil is of the paraffin variety. Paraffin base oils have a low aromatic content; they are associated with good lubricating performance and favour high loads during continuous operation. They o

Filter whose filter element contains paper made of natural or artificial fibres. Depending on the form involved, a distinction is made between star-shaped paper filters and wound paper filters.

Volume counter (not a flow rate counter !) based on two oval rotors with special teeth which cause the fluid flow to rotate ( Figure O 12 ). The flow sensor with oval rotor assembly operates with grea

Device used to visualise and record the course of physical processes which change over time, and particularly those involving oscillation. The following distinction is made in terms of functionality:

Circular ring with an almost perfectly round cross section which is mainly used in fluids technology to seal machine parts when at rest ( Figure O 11 ). Its sealing action is achieved through axial or

Special form of annular gear motor whereby the outer ring with its seven teeth remains still, while the inner wheel with its six teeth performs a planetary-type movement. As a result, a volume associa

The operational amplifier is a DC amplifier with a large negative gain factor, very high input resistance and very high output resistance. The operational amplifier always operates on the principle of

"Open loop"; because the term "control" applies to both ordinary controls and , the words "open loop" is added to designate an ordinary control (not involving feedback). Opposite: closed loop .

Pressure at which the safety valve delivers the stroke required for the mass flow to be discharged. The opening pressure is equal to the response pressure (operating conditions) plus the opening press

Valve which is closed in the rest position and opened when the flow rate is actuated. Opposite: normally open valve .