Transmitter (unit transducer)
Measuring arrangement, in which a sensor is integrated in a device with a standard electrical with zero and end point comparison elements, which can be adjusted externally and issues a standard output
Thermoplastics
temperature resistance from –270° to +260° C. PTFE is used in seals with an elastomer core and in the case of sliding rings and guide rings with filler materials. PA (polyamide, e.g. nylon) has good sliding [...] absorption (swelling). POM (polyacetal, e.g. Delrin) has high mechanical strength, result in parts with a high degree of dimensional accuracy. Material commonly used for back rings, guide rings and scraper
Buckling of rams
value is referred to as the buckling force F K. Cylinders with a large stroke and/or a thin piston road should undergo further calculations with regard to possible buckling. Euler's formula applies in this [...] horizontal cylinders or those tilted at a considerable angle, since the bending stress associated with the component's own weight is added to the compressive stress in such cases (Figure K 13) .
Swivel motor
made between ( Figure S 41 ): The most simple construction type, which requires the most space, works with toothed rack pistons, which enter into a transversally mounted sprocket ( a ). This construction type [...] motors has the pistons arranged in an axial direction and transfers the torque over steep threads with different designs ( b ). Suitable for pivoting ranges of up to 360°. Rotor swivel motors generate [...] rotating wing to allow hydraulic fluid , which is connected to the drive shaft ( c ). Very compact design with a pivoting angle range up to approximately 310° (in the case of two rotating wings: approx. 110°)
Alpha value of filters
the permissible final pressure difference is reached at the rated flow rate QN: γ = contamination with ACFTD in the flow rate, Q = flow rate through the filter, τ = test time until the permissible final [...] dirt holding capacity". It is used to compare the service life of filter elements of the same size with the same β value. The α values is a calculated variable that does not take into account if the filter [...] performance the numerical value for α is very high. It must therefore always be evaluated in conjunction with the filter cumulative efficiency , otherwise it will cause confusion. See also dirt holding capacity
Primary and secondary control
transmission based on a combination of a pump and motor with adjustable geometric displacement. This ensures the highest rotation speed range is achieved with a good level of utilisation ( Figure P 16 ). The
Feed circuit
Low-pressure circuit in a hydrostatic transmission with the task of constantly replacing the small oil volume with fresh oil in a closed circuit. For this purpose, there is a feed circuit from the Charge
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. Of these, one
Contact controls
Controls which link signals with each other using logic by means of contactors and relays — fitted with contacts. These days, contact controls only tend to be used for small-scale controls, i.e. those
Digitally controlled valves
Pressure and flow valves with digital adjustment of the pressure and the flow rate by digital cylinders or by electrical stepper motors. While only a limited number of steps are allowed with cylinder actuation