。 Make pressure semi-automatic stem must have value and pressure transmitter sent 4 ~ 20 ma current signal, after the regulator operation difference to the servo amplifier, servo amplifier, judge the phase, the output positive and negative turn signal to electric actuator stem of the valve opening and closing, electric control valve position feedback signal to the servo amplifier imposed on the comparison, a cop value is zero, no stem signal output, the valve stops in the corresponding position. At this point, you don't have to add the controller and the servo amplifier. If have the DCS system, such as Marine valves to stem, DCS itself should have corresponding AI mimic current signal input card, deserve to go up again a dedicated and relay output card, through configuration, can curb the electric control Industrial Valves. Office principle a: q: steam electric regulator for early common electric regulator to add regulator, add the servo amplifier. If not curb the motor and reversing the card, you need to match the corresponding instrument suitable grade card, before to stem and reversing motor, thus achieve stem electric regulator office. For the intelligent electric valve because itself has the function of the servo, because this can directly accept 4 - from the transmitter 20 madc current signal, Can also be accepted from DCS stem system such as card output 4 - 20 madc mimic current signal) And at the same time add 220 vac power to Industrial Valves. But if do in present fixed value adjustment, demand plus regulator, don't need to add the servo amplifier. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate Industrial Valves, globe valve, check valve, relief valve, safety valve, Marine valve, oil valve, hydraulic control valve and other kinds of valves.
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