MVD – Motorized valve drive

Block SymbolLicensing group: STANDARD

Function Description
The MVD block simulates a servo valve. The UP (DN) input is a binary command for opening (closing) the valve at a constant speed $1 ∕ tv$ , where tv is a parameter of the block. The opening (closing) continues for $UP = on$ ( $DN = on$ ) until the full open $y = hilim$ (full closed $y = lolim$ ) position is reached. The full open (full closed) position is signalized by the end switch HS (LS). The initial position at start-up is $y = y0$ . If $UP = DN = on$ or $UP = DN = off$ , then the position of the valve remains unchanged (neither opening nor closing).

Inputs

UP	Open	Bool
DN	Close	Bool

Outputs

y	Valve position	Double (F64)
HS	Upper end switch	Bool
LS	Lower end switch	Bool

Parameters

y0	Initial valve position	Double (F64)
tv	Time required for transition between $y = 0$ and $y = 1$ [s] $⊙$ 10.0	Double (F64)
hilim	Upper limit position (open) $⊙$ 1.0	Double (F64)
lolim	Lower limit position (closed)	Double (F64)

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