| 摘要 |
<p>Valve arrangement for introducing wash air in a shock-like manner in filters for air or gas cleaning, comprising a filter air valve and a wash air valve of which in principle one is open when the other is closed and vice versa. The wash air valve is a disk valve which in closed position is subjected to the difference between the wash air pressure and the filter air pressure, so that this pressure difference contributes to keeping the valve closed. The valves are actuated by a compressed air cylinder through the intermediary of a common, axially movable piston rod. The valve disk in the wash air valve is actuated by the piston rod through the intermediary of a spring the spring force of which in the closed position of the valve acts against said pressure difference and increases when the filter air valve is closed. The compressed air cylinder is dimensioned and arranged in such a way that in the same there is built up a compressed air reserve volume which by air spring effect gives a terminating, quick movement of the piston rod when the wash air valve is opened.</p> |
