| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level detection cutoff valve usable for a volatile combustible fluid safely and inexpensively manufacturable. SOLUTION: This liquid level detection cutoff valve comprises a valve body 1 provided with a main valve seat 4 between an inlet-side channel 2 and an outlet-side channel 3, a main valve 5 contacting/separating to/from the main valve seat 4, and an opening and closing mechanism 7 for allowing the main valve 5 to contact to or separate from the main valve seat in accordance with a position of a float 6. The opening and closing mechanism 7 is provided with a diaphragm 72 connected to the main valve 5 through a main valve shaft 71, a pilot pressure chamber 74 including the diaphragm 72, and communicated with the inlet-side channel 2 through a hole penetrated through the main valve shaft 71, a pilot valve 77 for opening and closing a communication hole 76 to communicate the pilot pressure chamber 74 with the outlet-side channel 3, a spring 79 for constantly energizing the pilot valve 77 in the direction to close the communication hole 76, and a cam lever 81 slidably supported on the valve body 1, connected to the float 6 at its one end, abutted on the pilot valve 77 at the other end, and opening and closing the pilot valve 77 in accordance with the position of the float 6.
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