PURPOSE: To maintain the stable sealability of a globe valve, even if the temperature and the heat transfer coefficient may change, by allowing a bellows to be compressed or expanded, so that the dimensional difference due to the difference of thermal expansion can be absorbed.

CONSTITUTION: A seat part 9 that is expansible in the open/close direction of a valve body 6 is provided to the seat part 5 for forming the valve body port 4, and the seat part 9 is made up of a cylindrical bellows 10 that has a flow passage 12 in its inside and is expansible in the open/close direction of the valve body 6, and a seat ring 11 that has been provided to the opening peripheral part of the bellows 10 and also that is pressedly brought into contact with the closing valve body 6.