| 摘要 |
<p>A torch valve (10) for pressurized fuel includes a valve body (20) having a central, axial bore (22) and a valve needle (50) threadedly mounted in the bore for selectable axial positioning in the bore. A inlet portion (24) of the bore forms an inlet connectable to a source of pressurized fuel. A second portion of the bore carries the valve needle (50). An outlet passage (26) communicates with the bore at a point approximately where the second portion joins the first portion. The outlet passage extends laterally from the bore to open at an outlet orifice on the outer surface of the valve body. The outlet orifice includes means for attaching a torch and igniter assembly to the valve body. The needle includes a stem (52) that terminates in a needle tip. An annular ridge extends from the stem spaced from the tip and defines a first groove (54) between the ridge and stem. A second groove (56) is formed in the stem spaced from the first groove. Each of the first and second grooves carries a resilient sealing ring (72,74). The second groove and ring seal the outlet passage from the ambient environment. By positioning the needle valve with the first groove and ring between the outlet passage and the inlet, the outlet is closed from the inlet. A spring (82) and pin (80) arrangement is coupled with the needle on the inlet side of the valve body to regulate the pressure of gas in the outlet passage (26). <IMAGE></p> |
