Floating valve seat balanced-type high-temperature regulating cutoff valve

The invention provides a floating valve seat balanced-type high-temperature regulating cutoff valve, which comprises a valve body, a valve seat, a spool, a sleeve, a floating valve seat on the spool, and a valve rod. The spool is arranged in the valve body. The valve seat is arranged at a position between a water inlet and a water outlet in the valve body. The valve seat is fixedly arranged in the valve body through the sleeve. The end of the valve rod is connected with the spool. The upper end surface of the spool is connected with a spool cover plate through a screw. A ring notch is arranged on the side surface of the spool. The floating valve seat on the spool is sheathed at the ring notch. A ring groove with a rectangular section is formed between the floating valve seat on the spool, the spool and the spool cover plate. An alloy-graphite composite gasket and a spring are arranged in the ring groove. One end of the spring is elastically butted with the spool cover plate. The other end of the spring is butted with the alloy-graphite composite gasket. A gap is left between the spool cover plate and the floating valve seat on the spool. The floating valve seat balanced-type high-temperature regulating cutoff valve has the advantages that the two sealing pairs can be fully and simultaneously sealed, the sealing effect is better and the tolerable temperature is high.