GRV includes quarter-turn Gearbox and the multi-turn gearbox. The quarter-turn Gearbox is mainly applied in the ball valve, butterfly valve and plug valve. As the best selection for process adjustment and control of power, chemical industry and metallurgy, such product is applicable to the manual and automatic operation. The multi-turn gearbox is mainly applied in the globe valve, gate valve and pressure pipeline valve. As the best selection for process adjustment and control of the power, chemical industry, metallurgy and water  onservancy, such product is applicable to the manual and automatic operation.