The main drive is made up of the spur gear pair and 2k-H type planetary gear trains. The motor can be dismantled independently.

For the design of the planetary gear, the shift from manual to motor operation is fully automatic and no hand/auto lever is provided. The handwheel could be turned to operate the valve at any time.

The motor and the control mechanisms are mounted in an aluminum alloy cover. Wiring, debugging and repairing could be operated conveniently when the cover is removed.