Electric pneumatic regulator what are the advantages and disadvantages of each

Advantages in addition to the characteristics of high reliability, full function, super light, electric pneumatic control valve has the following advantages: (1) with the power supply is both convenient and save, save the building air station, a series of cost; 2 use pneumatic valve + electric valve positioner, air way of complex, it not only increases the cost, it lead to a drop in reliability ( The more links, poor reliability factors increase) ； (3) from the economic point of view, in addition to save the cost of the air supply station, also save the cost of electric valve positioner, a good imported electrical valve positioner, usually in 5000 ~ 6000 yuan of above, the better price in 8000 ~ 10000, and the price can be basically to buy back the highly reliable electronic actuators; (4) link down, reducing the workload of maintenance accordingly. Shortcomings electric pneumatic regulator was not without his faults: motor running of internal heat can cause thermal protection, make the pneumatic - valve to stop work; Due to the motor must pass through multiple reduction to output torque, so the speed is not fast, in some requiring quick opening and closing is not applicable, big torque and high speed, is a more difficult to solve the contradiction between; Because of the moving parts, relatively prone to failure, especially in adjusting the working condition of frequent, easy to produce motor thermal protection, gear damage, module of fault, thyristor burnt under this condition, it is better to choose pneumatic pneumatic regulator is good.