德国贺德克比例换向阀，HYDAC比例换向阀

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    2. FLOW RATE

    Each valve is designed for a certain maximum flow

    - due to its nominal size. At ths flow it is still reasonable to operate the valve.

    An operation above this value will boost the power dissipation.

    This value also varies from valve to valve.

    3. TYPE OF HYDRAULIC FLUID

    The type of operating fluid is closely linked to its viscosity.

    HYDAC can only recommend hydraulic fluids according to

    DIN 51524 Part 1 and 2. For these fluids the function of the valves is warranted.

    HYDAC valves may be used generally

    only in specific viscosity ranges, as in

    too thin or thick liquids, the assured

    features can not be fulfilled. These

    viscosities are also different for the

    different valves, but in average in the

    range of 10 mm? /s to 420 mm?/ s.

    Like the ambient temperature the media temp.

    range has a direct effect on the used materials in the valve,

    e.g. their mech. strength. Generally, the maximum

    temperature depends primarily on the sealing materials. HYDAC defines here:

    zzNBR: from -30°C to +100°C (solenoid valves - 20°C)

    zzFPM: from -20°C to +120°C (all other influences see point 4)

    In solenoid valves coils are used

    which are designed to operate safely in the voltage

    range of +/- 15% of nominal voltage at max. 60 ° ambient temperature.

    The combination of steady surge and very hot temperatures

    can result in extreme cases to failure of the solenoid.

    Therefore always a good heat dissipation and voltage level has to be assured.

    德国贺德克比例换向阀，HYDAC比例换向阀