| 摘要 |
<p>The flap valve (2) incorporated in the exhaust pipe (1) of an engine, to regulate the pressure generated is locked in a sloping position inside the pipe to block it. In this position, it is retained by a spring loaded piston (10) sliding in a chamber (8) in the top of the pipe. - The edge of the flap in contact with the piston projects for a min. of a fifth of its dia. The piston projects both sides of the edge of the flap for at least a quarter of its diameter. The spring (17) which holds the piston down has an increasing characteristic.</p> |
