Purpose: Valves rack and pinion used for the production of grain and products of its recycling bins, storage facilities and pipelines, and to load product into process equipment. Working principle: The valve combination of the type RS-RR-e have two drive – manual and electric. The valves with a combo drive has two gate. One gate is moved by means of a manual actuator at the required distance, or you can block the entire cross section. The second gate is driven by the electric drive, moving the damper to close the section completely or at the required distance. Opening/closing a gate controlled electric drive, can be performed with the remote control.