The invention discloses a multi-gear steady-supporting
ball valve controlled by a double rocker. The multi-gear steady-supporting
ball valve comprises a left
flange, a pre-tightening piece, a separation ring, a left pressing ring, a lower convex
valve seat, an upper valve body, a shaft sleeve, a connecting plate, a right
valve seat, a right pressing ring, a pressing plate
flange, a lower spring, aleft protruding part, a lower valve body, an outer valve rod, a lower valve shaft, a ball body, a first long rod, a first short rod, an upper connecting rod, a second long rod, an auxiliary shaft, alower connecting rod, a second short rod, an auxiliary valve plate and an inner valve rod, wherein the inner valve rod is arranged in the outer valve rod, the first long rod and the first short rod are arranged at the lower end of the inner valve rod, the
tail end of the first long rod is connected with the lower connecting rod, the
tail end of the first short rod is connected with the upper connecting rod, the other end of the upper connecting rod is connected with the top end of the second long rod, and the other end of the lower connecting rod is connected with the top end of the second short rod; and the upper connecting rod and the lower connecting rod are located on different horizontal planes and do not interfere with each other, the lower end of the second long rod is connected with the auxiliary valve plate, and the lower end of the second short rod is connected with the auxiliary valve plate. The multi-gear steady-supporting
ball valve is characterized in that the inner valverod rotates to drive the first long rod and the first short rod to rotate so as to drive the second long rod and the second short rod to rotate, and therefore the auxiliary valve plate can be drivento be opened and closed, and the auxiliary valve plate is screwed into the ball body when opened; and a groove for containing the auxiliary valve plate in the ball body is formed by injection molding.