Danfoss VFS 2 Datasheet - Page 5

Browse online or download pdf Datasheet for Control Unit Danfoss VFS 2. Danfoss VFS 2 8 pages. Seated valve for steam pn25, 2-way valve, flange

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Data sheet

Control valve sizing diagram for steam

Max. Δp in low pressure steam application variance from 0.5 bar to 6 bar (see page 2)

VFS 2

Steam valve sizing is based on 40 % of the

absolute steam pressure (immediately upstream

of the valve), being dropped across the valve

when fully open. At this condition the steam

is travelling at or close to its critical velocity

Critical Pressure Drop (kPa)

(approx. 300 m/s) and throttling will occur over

the full valve stroke. If the steam is travelling

slower than this then the first part of the valve

stroke will merely increase the velocity of the

steam without reducing the volumetric flow.

Superheat °C

VD.HC.L3.02 | 5