Open to open the electric flashboard valve structure design, with light weight, easy to maintain (o-ring seal replacement, electric hydraulic device maintenance inspection, change, the local maintenance of the valve are in outside, does not affect the normal operation of the valve), the movement process of the valve, switch state intuitive is good, after test completion status is extremely convenient, is irreplaceable by enclosed is superior,  the disadvantage is that there is a small amount of gas leakage when opening and closing operators pay attention to protection