| 摘要 |
<p>This automatic valve for controlling gas passage through ducts, particularly through feed ducts of two-stroke internal combustion engines, is provided with a chamber (4) arranged to determine the opening and closure of slot-shaped flow ports (2A min , 2B min ) by pressure difference; this takes place by the movement away from and towards contact surfaces of only edges which are perpendicular to the direction of flow, using dihedron-shaped flaps of which those edges parallel to the flow graze end walls provided parallel to them to prevent transverse flow seepage. The prevention of such transverse flow seepage is favoured by inserting the dihedron-shaped flaps into containing seats which support the sides at said edges parallel to the flow, and which also limit transverse deformation by the pressure on the inside of the dihedron which determines valve closure.</p> |
