| 摘要 |
A double-pintle valve ( 20 ) has two seats ( 54, 56 ) each circumscribing a respective through-hole for exhaust gas flow. The through-hole of one seat ( 56 ) is large enough diametrically to allow the closure ( 46 ) that seats on the other seat ( 54 ) to pass through during fabrication of the valve. The closure ( 46 ) seats substantially on a radially outermost portion of a frustoconical surface zone ( 54 B) of the seat ( 54 ) and the other closure ( 48 ) seats substantially on a radially innermost portion of a frustoconical surface zone ( 56 B) of the one seat ( 56 ) when the valve is disallowing flow.
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