Why the Air Tank Accumulators required for the single acting
actuators SDV's or BDV's as I see in some Schematic diagrams
of ROTORK ??
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Answer Posted / ayaz
Sdv or bdv work on demand of emergency, so we use the fail safe position
1-when any electrical or pneumatic supply fail the valve will be go on safe position
2- when use double action means two side supply produce not a spring to close.
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pls give me presant awerness quistion and answer in my emailid.
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
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