Which brand of electric valve works well?

Shan Ye in Taiwan Province and i-tork in Korea are both good. One feature of Shan Ye is the handwheel device, which is designed without clutch. When the current is interrupted, the valve can be directly turned to the required position by manual operation without using any auxiliary tools (wrenches, brakes, etc.). ), and in the case of normal power supply, there will be no personal injury or driver failure caused by handwheel error.