410 02.06.1998 SENTO OY HÖGFORS P.O.BOX 13, FIN-24101 SALO, FINLAND TEL + 358 2 727 7200 FAX + 358 2 727 7201 Butterfly valve of stainless steel PN 16 PN 10 Design The butterfly valve is flangeless and has a double eccentric disc. The disc is mounted to the shaft with tangential conical keys. The stuffing box can be tightened. The butterfly valve is supplied complete with optional actuators - lever for DN 80... 200 valves besides with metal seal DN 80...150 valves - manual gear for DN 80...600 valves - electric, pneumatic or hydraulic actuator for DN 80 ...600 valves. Face to face lenghts according to ISO 5752 series 25 The mounting is between drilled flanges according to DIN 2501 PN16 PN10 Nominal sizes DN 80...600 The following classification societies have approved these valves Det Norske Veritas DN 80...600 Bureau Veritas DN 80...600 Maritime Register of Shipping DN 80...600 Operation The butterfly valve is a stop and regulating valve which is tight for both directions of flow. The valve is used in demanding industrial pipelines. Nominal pressure 16 bar DN 80 ... 250 10 bar DN 300 ... 600 Disc seal alternatives - FPM (Viton) chemical-resistant + 150°C - EPDM heat-resistant + 100°C - NBR (Nitril) oil-resistant + 80°C - PTFE chemicals + 180°C - AISI 316 + 260ºC Maximum closing pressure difference depends on the working temperature Pressure (MPa) Temperature (°C) Pressure (bar) Code number Seal 410 VS_ _ _ FPM (Viton) 410 ES_ _ _ EPDM 410 NS_ _ _ NBR (Nitril) 410 TS_ _ _ PTFE 410 CS_ _ _ AISI 316
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Butterfly valve of stainless steel PN 16 PN 10products.onninen.com/documents/original/12488/7/3/410ukpdf.pdf · TEL + 358 2 727 7200 FAX + 358 2 727 7201 Butterfly valve of stainless
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The butterfly valve is flangeless and has a double eccentricdisc. The disc is mounted to the shaft with tangential conicalkeys. The stuffing box can be tightened.The butterfly valve is supplied complete with optionalactuators- lever for DN 80... 200 valves besides with metal seal DN 80...150 valves- manual gear for DN 80...600 valves- electric, pneumatic or hydraulic actuator for DN 80 ...600 valves.
Face to face lenghts according to ISO 5752 series 25
The mounting is between drilled flanges according toDIN 2501 PN16 PN10
Nominal sizes DN 80...600
The following classification societies have approvedthese valvesDet Norske Veritas DN 80...600Bureau Veritas DN 80...600Maritime Register of Shipping DN 80...600
Operation
The butterfly valve is a stop and regulating valve whichis tight for both directions of flow. The valve is used indemanding industrial pipelines.
Nominal pressure 16 bar DN 80 ... 25010 bar DN 300 ... 600
Butterfly valves are supplied with following actuator options:- a lever or gear,- electric , pneumatic or hydraulic actuators.
Hand leverA lever is suitable for manual operation of small sizes ofbutterfly valves DN 80 to 200, except for valves withmetal to metal seats, where gear and handwheel is used insize DN 200 and larger. The position of the disc can befirmly fixed in any position between open and closedby the locking device incorporated. The hand lever is sup-plied positioned crosswise to the pipe with the valve closed.
Manual gear
The valves are supplied with gearbox and handwheel.The disc position is shown by a mechanical indicatoron the actuator.
The effect of conesOften it is advantageous to choose a valve one or twonominal sizes smaller than the pipe. When the openingangle of the inlet cone is under 40°, the effect of conescan be approximately determined by the following table.
Picture 1:
The consistency of the mass Coefficient
Picture 2. Piping geometry factor Fp and pressure drop ratiofactor XTP of butterfly valve
GasesFpKv = 36000 w
Ψ √ ρ1∆pKv = capacity of valve (picture 1 )
Fp = piping geometry factor (picture 2)
w = mass rate (kg/s)
k1 = gas density (kg/m3) incoming
∆p = pressure drop (Pa) over valve
Y = expansion factor
∆pY = 1-
Butterfly valves. Guidelines for choosingMassWhen the flowing medium is a mass the necessary capacitycoefficient depends among other things on the rate of flowand the quality of the mass. For practical needs the approxi-mate constants can, however, be determined, and whenmultipled the requisite capacity coefficient can be obtainedin each case.
∆pmax = Fkp1xTP
Ymin = 0,67{
Fk = factor dependent of specific heats rate(example for air Fk = 1,0 and for steamFk = 0,94)
p1 = the absolute incoming pressure (Pa)
xTP = pressure drop ratio factor specific for valvetype (picture 2)
1) watervapor density is on sheet "Water characteristics"Pipe size D = 200 mmRequired capacity