Shut-off valve for high temperature erosive flow

Claim 1

A shut-off valve for high temperature erosive flow comprising, a body provided with a flow passage through it including an enlarged internal chamber, the downstream end of the flow passage projecting into the enlarged internal chamber, a valve seat having a valve seating portion disposed in the enlarged internal chamber about and upstream of the downstream end of the flow passage in the enlarged internal chamber, said valve seating portion projecting from the downstream end of the flow passage and having a tapered outer wall and a surface extending outwardly from said tapered outer wall, a resilient seal secured to said surface extending outwardly from said tapered outer wall, a valve member having a seating surface arranged to seat on the valve seating portion, the valve member valve seating surface having a tapered portion engaging the tapered outer wall and another portion extending outwardly engaging said resilient seal when seating against the valve seating portion, means disposed in the enlarged internal chamber operable to rotate the valve member to seat the valve seating surface thereof against the valve seating portion to close the valve and to rotate the valve member out of the direct flow through the flow passage to open the valve, said last-named means including a rotatably mounted shaft disposed in the enlarged internal chamber out of the erosive flow path, and means connecting the valve to the shaft effective so that rotation of the shaft rotates the valve member to open and close the valve as aforesaid, whereby, there is an effective shut-off by the valve when closed and the valve seating portion and the valve seating surface are out of the erosive flow path through the valve when the valve is open.