Ventilation valve for reciprocating internal combustion engine, has valve unit lifted from seat, so that valve is opened in direction, if positive pressure difference between pressures in crankcase and intake system exceeds preset value

摘要

The valve has valve spring (11) pressing a valve unit (12) against a valve seat (15). A deformable diaphragm (17) is arranged, on a side turned away from the spring, over an opening of the valve unit. The diaphragm is deformed, so that the valve is opened in one direction to ventilate a crank case, if pressure in an intake system exceeds pressure in a crank area of the case. The valve unit is lifted from the seat, so that the valve is opened in another direction, if a positive pressure difference between two pressures exceeds a preset value.