| 摘要 |
A pressure-responsive valve operable to close when the pressure falls below a predetermined minimum level. After closure, the valve must be manually reset to its open position where it is retained by the pressure of the fluid against a diaphragm positioned within a chamber adjacent the valve. When used in conjunction with a oil-fired boiler, the valve prevents boiler flareback by closing when the pressure falls below a predetermined minimum level and by requiring a monitored, manual reopening, thereby preventing undesired ignition.
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