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The Pq double eccentric hemispherical valve is successfully developed on the basis of digesting and absorbing the high flow direct method produced by foreign companies. Its structure adopts the principle of eccentric tightening, and achieves the purpose of locking, adjusting and closing through the transmission mechanismThe sealing pair is a hard surface contact seal with a large metal face ring. The double eccentric structure has a large flow section and the valve is not washed when it is opened, and the valve core is not washed when it is closed. When it is opened, the spherical surface of the valve core is gradually along the valve seat, effectively removing the scaling obstacle and realizing reliable sealing.