There is service-system with electric actuator without equipped with service-amplifier. It’s controlled by inputting signal and power, simple connection. Trim and seat sealing of adjust actuator with surfacing carbide which allow large pressure difference, small leakage. Trim sealing surface with PTFE to charge no leakage. So this kind of valve is widely used in petroleum, chemical industry, metallurgy, power station, light production where requires large pressure difference and closely occasion.
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