| 摘要 |
A thermally responsive valve (10) for valving adjacent first (21) and second (22) fluid ports is disclosed which prevents harmful fuel vapors from adversely affecting the valve power element (12). An elongated valve member (82) is movably contained within a housing fluid chamber (18) and spring-biased toward a closed position whereupon a first seal ring (90) located around the valve member engages with a valve seating surface (70) located intermediate the two fluid ports. When predetermined temperatures are encountered, a thermally responsive power element (12) connected to the lower end of the valve housing overcomes the biasing force of the spring (106) and moves the valve member to an open position in which the valve surface is spaced from the valve seat, thereby permitting fluid communication between the two ports. A lower portion (104) of the valve member extends beyond the fluid chamber and abuts with an output rod (60) of the power element. A stationary seal ring (72) is mounted in a housing counterbore (76) and engages the periphery of the valve member lower portion for sealing the fluid chamber from the thermal power element.
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