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FQ647M pneumatic coal powder unloading ball valve adopts upper and lower stem fixed spool (shaft support) and movable sealing seat design.Work is more stable.With automatic compensation function, two-way sealing valve seat has a great shear force and self-cleaning function when turning without clearance.It is especially suitable for the on and off of imperial fiber, suspension and viscous medium with tiny solid particles.Deposited with straight-through type structure, the port open, there will be no jam phenomenon, seal USES the alloy material, with special heat treatment, anti-scouring wear-resisting valve, eccentric spherical valve with automatic compensation performance at the same time, through adjusting bolt on the worm gear, make the seal under the condition of a certain degree of wear and tear, still can reach to the effect of the seal.(dust gas, particle fluid).