| 摘要 |
A combination control device for main and pilot burner apparatus having a differential pressure operated diaphragm valve operated by an internal bleed line which is subject to pressure regulation, thermostatic on-off control, and high-temperature shutoff regulation. The pressure regulation, thermostatic on-off control, and high-temperature regulation features are independently provided by individual valve assemblies so as to increase the overall fail-safe characteristics of the combined device, the high-temperature valve assembly including a hydraulic snap acting mechanism actuated by a closed hydraulic system charged with a gas vapor having a vapor pressure which is less than atmospheric pressure for enabling rapid fuel flow cutoff upon the occurrence of a preselected excessive ambient temperature and for assuring fuel cutoff in the event of a rupture of the hydraulic system.
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