The electric three-piece threaded/threaded ball valve is small in size and consists of a three-part valve housing with four longer bolts clamped between the valve body and the ball from both ends. Its advantage is when maintenance disassembly does not have to remove the pipe thread, and directly remove the four bolts, the middle part of the valve body can be taken out. The working principle is also to drive the rotation of the sphere through 90 degree rotation of the pneumatic actuator to achieve the flow of media and block. The direct connection between the actuator and the valve body reduces the chance of failure. It is suitable for light industrial machinery with small volume and narrow space.