Process control unitThe new Type 8630/31 fully integrated Top Control head unit is designed for decentralized intelligent process control.It can interface with a complete line of 1/2 in. to 2 in angle globe, quarter turn ball, and diaphragm valves with an advanced top-down control technology. With seven built-in flow characteristics (three fast opening, one linear, and three equal percentage) and the ability to design your own flow curve, the need for various internal valve trims is eliminated. The 8630/31 also allows set point adjust to be done at the valve or externally via standard analog input signals. A variety of direct sensor inputs is also available including RTD, 4-20 ma, and fre...

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