Low-torque plug valve

The utility model relates to a low-torque plug valve which comprises a valve body, a valve deck, a plug body, a valve rod, a driving device, a packing gland and a driving rod. The lower end of the driving rod is connected with a first connecting sleeve in a sleeved mode. The upper end of the valve rod is connected with a second connecting sleeve in a sleeved mode. The first connecting sleeve is sleeved with a transfer sleeve. The first connecting sleeve is connected with the second connecting sleeve. A first ball is arranged between the first connecting sleeve and the transfer sleeve. The first ball has the first position and the second position, wherein the first position is between the transfer sleeve and the first connecting sleeve, and the second position is between the first connecting sleeve and the driving rod. A second ball is arranged between the first connecting sleeve and the second connecting sleeve. The second ball has a first position and a second position, wherein the first position is between the first connecting sleeve and the second connecting sleeve, and the second position is between the second connecting sleeve and the transfer sleeve. In the valve opening and closing process, the plug body firstly ascends and is rotated by 90 degrees after the sealing face of the plug body is disengaged from the valve body, the plug body is rotated to descend, it is ensured that a plug body channel is concentric with a valve body channel, contact between the plug body and the valve body is avoided due to the motion, and torque is reduced.