Electrohydraulic valve has plastic composite material of piston with mean thermal expansion coefficient which in specific temp. range deviates by 50 max. from mean linear thermal expansion coefficients of aluminum alloy of sleeve

摘要

The electrohydraulic valve (1) has a piston (4) consisting of plastic composite material which is axially movable in a sleeve (8) of aluminum alloy. The mean thermal expansion coefficient of the plastic composite material in a temperature range of 0 to 100 degrees C deviates at most by 50% from the mean linear thermal expansion coefficients of the aluminum alloy in the said temperature range.