Closed loop control system

If liquid flow-control valve is opened in a step-change fashion, flow through the pipe tends to selfstabilize at a new rate very quickly. The following illustration shows a typical liquid flow control installation, with a process trend showing the flow response following a manual step-change in valve position:...
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Glob Valve

Glob valve is so much used in current industries now a days. In glob valve flow is controling by movable plug and stationary seat. Glob valve design is one of the most popular design of sliding stem valve. Cut view of Glob valve photos are...
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