To prevent formation of a gap between the upper surface of a packing gland and the lower surface of a yoke sleeve even when the packing gland is lowered.

A valve stem 12 is journaled in a journaling portion 8 of a valve box in an upwardly and downwardly movable manner; a packing 19 is interposed between the journaling portion 8 of the valve box and the valve stem 12; a packing gland 21 which presses the packing 19 is arranged above the packing 19 through a packing gland ring 20; a yoke sleeve 26 inserted into a yoke portion 25 of the valve box and screwed into the valve stem 12 is provided above the packing gland 21; and a valve seat 4 in the valve box 2 is opened and closed with a valve element 11 provided at the lower end of the valve stem 12 by rotating a handle 27 fitted into the yoke sleeve 26 to move the valve stem 12 upward and downward. A protective tube 20a formed integrally with the packing gland ring 20 is provided between the packing gland 21 and the yoke sleeve 26 around the valve stem 12. A guide projection 26b with which the inner periphery of the upper end of the protective tube 20a comes into contact is provided on the lower surface of the yoke sleeve 26.