| 摘要 |
<p>A fuel cock (1) has a valve body having a bore (6) with a tapered bore portion therein, and fuel inlet (8) and outlet ports (14) and air inlet (20) and outlet ports (20a) which are communicated with the bore. The fuel cock is provided with a fuel plug (4) having a piston end (4a) and rotatably engaged in the tapered bore of the valve body so as to close and open a fuel passage between the fuel inlet and outlet ports, and an air plug (5) rotatably engaged in the bore so as to close and open an air passage between the air inlet and outlet ports. A chamber (6a) is formed between the piston end (4a) of the fuel plug and air plug (5), and the pressure of the air at the air inlet port (20) is applied to the chamber (6a) and to the piston end (4a) to urge the fuel plug (4) towards a small diameter end so as to ensure the sealing effect. The fuel plug (4) and air plug (5) are so arranged as to close and open both the fuel passage and air passage at the same time.</p> |
