Self-operated Control valve

The perseverance controls (B , the K) type coming to carry out an automation self\'s pressure change being one kind of unnecessarily outside sources of energy but making use of only that medium obj1 = " ?" ? is exchanged from strenuously dyadic pressure regulating valve in front of the regulating valve or after the valve or relax the pressure the energy conservation type product, may continue being put into use under 350 ~C steam across the temperature jar in passing.