Plastic ball valve

A plastic ball valve consists of a valve body, a valve base inside the valve body and a ball valve core with via hole. A seal surface is formed between the ball valve core and the valve base, the ball valve core is provided with a valve stem, a seal element is arranged between the valve stem and the valve body, the valve stem connects to external transmission mechanism, the valve body consists of a part which has a zygomorphy structure, the ball valve core takes the central shaft as symmetry axis, the ball valve core has a symmetry eccentricity structure, the unilateral eccentricity is 2 to 15 mm. The beneficial effects of the utility model are: 1. The seal structure of the valve base uses a symmetry eccentricity structure making the friction torque of the valve core and the valve body switching process greatly reduced, and it is easier to switch and resists abrasion. 2. Because of the using of symmetry eccentricity structure, when the ball valve is closed, the eccentricity generates larger sealing force to solve the problem of the sealing of valve base for plastic ball valve. 3. The utility model can lead plastic ball valve to high parameters development.