Design a system utilising valve positioners

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Reference no: EM131713132

Problem

FIGURE shows a partially completed diagram of a flow control system. The flow controller is reverse acting and has a 0.2 to 1.0 bar pneumatic output signal which will supply both control valves V₁ and V₂.

The small range control valve, V₂, only needs to operate on the first 25% output change of the controller output signal. For larger flow rates the small range valve will remain fully open and control will be achieved by operation of the large range valve. Note the differing air failure action of the two valves.

Design a system utilising valve positioners which will meet the prestated specifications.

Reference no: EM131713132

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