permissible with regard to its resistance to mechanical
vibrations. The resistance of hydraulic valves to mechanical
vibrations is usually tested in accordance with the relevant
standards, such as, e.g. DIN-IEC68, part 2–6 [12] in the case of
the D1FP distribution valve. Valve mechanical vibration
resistance tests can also be conducted in accordance with
other procedures described in Polish and international
standards.