thrust requirements based on Marine Industrial Valves, electric actuator in compact and its packaging ( Figure 5. 26) The larger combination with direct drive and handwheel. ( Figure 5. 27) Is desirable. As shown in figure 5. 28 and figure 5. 29. The basic structure of electric actuators controlled by the motor, gear box, or gear, electric switch, limit switch, torque and position control facilities, etc. According to its structure, the motor efficiency is higher when the large amount of speed, so most electric actuators using certain types of machinery facilities ( Such as hammer hydraulic yoke nut) To mesh loads. This is very important, because in the valve opening and closing requires greater thrust and torque. Because of the actuator is operating in two direction, the motor must be reversible to open or close the valve. : for efficiency reasons, motor under high speed operation ( 1000 ~ 3600 r / min) Is the best. Therefore, the valve need to use the gear to reduce speed. Use worm gear reduction gear box, in order to extend the life of the gear of the biggest it closed in the oil bath as a whole.

due to the electric actuator deviates from the resistance and torque, if the actuator failed to well adjust Marine valve will be overrun, it is likely to damage or destroy regulating elements or the limits of the valve stroke. To prevent excess schedule, when to open and close position, the limit switch to turn off the motor, also can use the torque switch to close or open a torque increases to turn off the motor. The additional benefit is that if - torque switch Objects are stuck in regulating elements were occlusion or valves, prefer to turn off the executing agency, rather than thrust to the closed position and further damage to the valve. Ideally, the torque switch best for floating together valves ( Such as Joan valve or wedge gate valves) Best used in fixed width, and the limit switch of the valve ( Such as cut-off valve or butterfly Industrial Valves) 。

electric control facilities can be attached to the Marine valve itself or in remote places use extension wire control. The use of hand lever or button motor operation. For hand lever, the hand lever clockwise, the executing agency; And counterclockwise, actuator stem shrinkage; The hand lever in the middle position, switch off the motor and keep in that location. For the button control, made on the structure; With three buttons - - Stem extension stem, a contraction, the other is switch off the motor. Use red or green light to inform the user, when the Industrial Valves is in open a volume is usually for the green, when the valve in the closed position, usually red, when the motor in operation, two lights all light up.

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