Specification sheets

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GEMÜ 488

Motorized butterfly valve

GEMÜ 490

Butterfly valve with bare shaft

GEMÜ 491

Pneumatically operated butterfly valve

GEMÜ 497

Manually operated butterfly valve

GEMÜ 498

Motorized butterfly valve

GEMÜ C481

Pneumatically operated butterfly valve

GEMÜ D450

Butterfly valve with bare shaft

GEMÜ D451

Pneumatically operated butterfly valve

GEMÜ D457

Manually operated butterfly valve

1 2 3 4

Standard formula calculator

Calculation for:

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mBar

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Volume flow

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l/h

l/d

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UK gal. / h

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Short tons (tn.sh.)

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Liquids

Absolute pressure upstream of the valve (p1) in bar

Absolute pressure downstream of the valve (p2) in bar

Density (p) in kg/dm³

Flow rate (Q) in _nm³/h

Pressure differential (ΔP) in bar

Mass flow (G) in kg/h

Standard density (ρn) in kg/m³

Valve key value (KVs) in m³/h

Volume flow (Qn) in _nm³/h

Absolute temperature upstream of the valve (T1) in °C

Specific volume at p2 and t1 (V2) in m³/kg

Specific volume at p1/2 and t1 (V*) in m³/kg

Supercritical volumetric flow

Subcritical volumetric flow

Gases

Absolute pressure upstream of the valve (p1) in bar

Absolute pressure downstream of the valve (p2) in bar

Density (p) in kg/dm³

Flow rate (Q) in _nm³/h

Pressure differential (ΔP) in bar

Mass flow (G) in kg/h

Standard density (ρn) in kg/m³

Valve key value (KVs) in m³/h

Volume flow (Qn) in _nm³/h

Absolute temperature upstream of the valve (T1) in °C

Specific volume at p2 and t1 (V2) in m³/kg

Specific volume at p1/2 and t1 (V*) in m³/kg

Supercritical volumetric flow

Subcritical volumetric flow

Steam saturated

Absolute pressure upstream of the valve (p1) in bar

Absolute pressure downstream of the valve (p2) in bar

Density (p) in kg/dm³

Flow rate (Q) in _nm³/h

Pressure differential (ΔP) in bar

Mass flow (G) in kg/h

Standard density (ρn) in kg/m³

Valve key value (KVs) in m³/h

Volume flow (Qn) in _nm³/h

Absolute temperature upstream of the valve (T1) in °C

Specific volume at p2 and t1 (V2) in m³/kg

Specific volume at p1/2 and t1 (V*) in m³/kg

Supercritical volumetric flow

Subcritical volumetric flow

Water

Absolute pressure upstream of the valve (p1) in bar

Absolute pressure downstream of the valve (p2) in bar

Density (p) in kg/dm³

Flow rate (Q) in _nm³/h

Pressure differential (ΔP) in bar

Mass flow (G) in kg/h

Standard density (ρn) in kg/m³

Valve key value (KVs) in m³/h

Volume flow (Qn) in _nm³/h

Absolute temperature upstream of the valve (T1) in °C

Specific volume at p2 and t1 (V2) in m³/kg

Specific volume at p1/2 and t1 (V*) in m³/kg

Supercritical volumetric flow

Subcritical volumetric flow

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