Patent ID: 8539977

Claim:
A surface pressure application method for a slide valve device for automatic surface pressure device, the slide valve device for automatic surface pressure application including: a fixed plate ( 3 ) fixed inside a base frame ( 2 ) that is mounted onto a bottom lower surface (l a ) of a molten metal vessel ( 1 ); a slide case ( 4 ) including a slide plate ( 5 ), the slide case ( 4 ) being provided below the fixed plate ( 3 ) so as to be slidable by an actuator ( 7 ); a seal case ( 21 ) provided below the slide case ( 4 ), the seal case ( 21 ) including a seal plate ( 6 ) or including a seal plate ( 6 ) and a shooting nozzle ( 21 a ); and a movable member ( 14 ) provided to each side portion of the seal case ( 21 ) so as to be movable on a support surface ( 13 ) situated at each side portion of the base frame ( 2 ), the slide case ( 4 ) and the seal case ( 21 ) being slidable by the actuator ( 7 ) so that a surface pressure is appliable and releasable, the base frame ( 2 ) of the slide valve device for automatic surface pressure application including: a positioning member ( 51 ) for determining an arrangement location (X) of the seal case ( 21 ); and a stopper ( 52 ) for fixing the seal case ( 21 ) at the arrangement location (X), the slide case ( 4 ) or a guide piece of the slide valve device for automatic surface pressure application including a pusher ( 53 ) for pushing the seal case ( 21 ), the surface pressure application method comprising: sliding the slide case ( 4 ) in a surface pressure application direction to move the seal case ( 21 ) to the arrangement location (X) together with the slide case ( 4 ) through the intermediation of the pusher ( 53 ); and fitting the stopper ( 52 ) to the seal case ( 21 ) that has been moved to the arrangement location (X) to fix the seal case ( 21 ) at the arrangement location (X).