| 摘要 |
PURPOSE: Preventing structure of LPG(Liquefied Petroleum Gas) from being leaked excessively is provided to regulate an LPG fuel feed line by controlling LPG without flowing back to prevent leakage of LPG. CONSTITUTION: A tank(51) is filled with liquid LPG and gas LPG therefrom. The liquid LPG is vaporized to gas if the temperature of external air is high. The pressure of the gas LPG rises up to be supplied. If the temperature of external air is low, the gas LPG has low pressure and the liquid LPG is supplied. To supply the liquid and gas LPG to an evaporator(50) selectively, a liquid LPG feed line(52) and a gas LPG feed line(53) are provided between the tank and the evaporator. A couple of isolation valves(54,55) are mounted at each feed line to isolate flow of LPG in emergency. Both conversion valves(57,58) communicates the liquid and gas LPG feed lines to a single feed line(56) of the evaporator selectively. When LPG is leakage through a damaged gas LPG feed line, liquid LPG having relatively high pressure flows into a body(61) of the conversion valve(58). The liquid LPG flows into a chamber(69) between a stopper(67) and the upper end of a plunger(64) through an orifice(68). The plunger is kept closed as the liquid LPG presses the plunger. A path(63) and an inlet(59) of the conversion valve(58) are isolated. Therefore, the liquid LPG does not flow to the gas feed line without leaking.
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