LOW TEMPERATURE LIQUEFIED GAS INTAKE/DISCHARGE VALVE, RECIPROCATING PUMP, AND FUEL GAS SUPPLY DEVICE

摘要

A fluid intake/discharge valve to be used when taking in a fluid of a low temperature liquefied gas into a cylinder liner and discharging the fluid by using a piston has: a valve seat body part (220) which includes a fluid supply part that supplies the fluid and a fluid ejection part that ejects the fluid; an intake valve (222) which is pressed towards the fluid supply part of the valve seat body part; and a discharge valve (228) which is pressed towards the fluid ejection part of the valve seat body part. The fluid supply part comprises: a supply path (244) which is connected to a supply pipe; a partition wall (248) which is provided to an end of the supply path and in which a plurality of intake holes are formed, said intake holes facing the intake valve; and counterbores (250) which are recessed parts provided to the partition wall in a manner so as to surround the peripheries of the plurality of intake holes and are configured such that the intake valve is in contact with the edges of the recessed parts when the intake valve presses the fluid supply part. Furthermore, a section at which the discharge valve receives fluid pressure from a discharge hole side has a pressure-receiving recessed part (228a) which is provided to a region that is wider than the outer periphery of the discharge hole.