Hydrodynamic torque converter in wind power plant transmission system. The paper presents results of a test rig investigation of a hydrodynamic torque converter. The dynamic characteristics base on a step change of hydrodynamic torque converter feed pressure. The results showed that it is possible to control of hydrodynamic torque converter in wide range on this way and the control system can be used in small wind power plants.

Magnetic fluid seals operated in utility water environment. The results of experiments aimed at determination of characteristics of magnetic fluid seals in immediate contact with utility water have been presented. Four grades of magnetic fluids were tested. These seals can operate in water environment but in a very limited velocity range and with magnetic fluids of strong hydrophobic properties.

The new conical seats of hydraulic valves used in mining. Construction of new conical seats in hydraulic valves used in mining has been described. The importance of right selection of material for such structures has been pointed out. It has been presented the tests range of valves and the calculation methodology of strength in dangerous cross-sections of designed conical seats.

Modal parameters of hydraulic leg with gas accumulator. A method for determination of modal parameters of a hydraulic leg with a gas accumulator has been presented. Impact of technical parameters of a gas accumulator on a change of free vibration frequency and damping coefficients has been analyzed. A possibility of excitation of resonant vibrations in components of the analyzed leg due to dynamic impact of rock mass has been negated.