Control-Valves and Sensors Pt 2 098.9

Control-Valves and Sensors Pt 2 098.9 - Surge Tanks Valves...

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Surge Tanks, Valves, Level sensors, and modeling Part 2 version 1.0
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dh dt = F - k 1 v 1 h h [0] = h 0 ODE model: Surge tank P&ID and model from previous lectures..
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LC1 What valve? What control line? What level sensor?
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On/off, reliable, inexpensive On/off, easy clean, see valve position Similar to ball valve, more $$, but more rugged High capacity, economical, can have good flow control Used for abrasive, sanitary, & corrosive environments Drain tanks w/o dead space High press. and high temp. environments Good flow control, hard to clean Best flow control, low flow Allows flow only in 1 direction Images courtesy of B. Barkel Angle valve Plug valve Bleed port plug valve Butterfly valve Diaphragm valve Flush bottom valve Gate valve Globe valve Needle valve Check valve Bleed port ball valve Ball valve Manual valve Type not specified
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(b) Low flow resistance when open, infrequently used but need reliability (a) Need to regulate the flow and robustly shut off if needed (c) Need good rangability, flow resistance okay, robust shutoff needed Globe valve? Gate valve? Needle valve? Name that valve!
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(e) Not a control valve, but vents if pressure is too high Safety valve (d) Low flow resistance with good control abilities Butterfly valve Check valve (f) Prevent backflow Name that valve!
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Solenoid operated valves (all valves except butterfly) Motor operated valves (all valves except butterfly) Air operated control valve (Globe, needle, ball valves) Air operated butterfly valve (circle in middle indicates butterfly) Air operated shut off valves (ball, plug, etc) Specify fail safe condition: FO: Fail Open FC: Fail Closed FL: Fail last position * Images courtesy of B. Barkel
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Automatic solenoid valve
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Name that valve! QuickTime  and a Cinepak decompressor are needed to see this picture. Movie from ChemE Visual Encyclopedia Answer : Motor operated (hydraulic) ball valve
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How to pick a valve? Type : Many kinds work, but some work better than others for specific applications. Materials : Can it withstand the pressure, temperature, pH, abrasiveness? Can it be cleaned?
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