Abstract: In a PTC heater unit configured to heat gas flowing through an inside of a heating gas passage with a PTC element, a gap passage (60) forming at least part of the heating gas passage (59) is formed between an inner peripheral surface of a base tube portion (42a) having the PTC element (43) disposed on an outer peripheral surface thereof and an outer peripheral surface of an insertion tube (61) inserted in the base tube portion (42a). Accordingly, it is possible to provide a pressure reduction valve for LPG fuel attached with a PTC heater unit capable of improving efficiency of heating using a PTC element.

Abstract: In an LPG fuel heating device in which a heat source for heating LPG fuel circulating through a gas passage is placed in a passage forming body outside of the gas passage, the passage forming body is provided with a passage-longitudinal-direction protruding wall (125) extending in a normal circulation direction of the gas passage (93) and multiple passage-width-direction protruding walls (126) being orthogonal to the normal circulation direction (124) and extending in a width direction of the gas passage (93) so as to enter the gas passage (93); multiple passage chambers (127) and multiple communicating passages (128, 129), which make mutually adjacent ones of the passage chambers (127) communicate with each other in a way that makes the LPG fuel sequentially circulate through the passage chambers (127), are formed in the gas passage (93) through cooperation among the passage forming body, the passage-longitudinal-direction protruding wall (125) and the passage-width-direction protruding walls (126); and the