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Type 439 Determination of coefficent of discharge in case of lift restriction or back pressure Diagram for evaluation of ratio of lift / flow diameter (h/d 0 ) in reference to the coefficient of discharge (K dr /α w ) h = Lift [mm] d 0 = Flow diameter [mm] of selected safety valve, refer to table article numbers h/d 0 = Ratio of lift / flow diameter p a0 = Back pressure [bar a ] p 0 = Set pressure [bar a ] p a0/p 0 = Ratio of back pressure / set pressure K dr = Coefficient of discharge acc. to DIN EN ISO 4126-1 α w = Coefficient of discharge acc. to AD 2000-Merkblatt A2 K b = Back pressure correction factor acc. to API 520 topic 3.3 Kdr = α w = f (h/d 0 ) Type 439 A lift restriction ist not applicable because the actual design and the certified lift are ≤ 1,5 mm / 1 /16 inch. Diagram for evaluation of ratio of the coefficient of discharge (K dr /α w ) in reference to the ratio of back pressure / set pressure (p a0 /p 0 ) 0,5 K dr = α w = f (p a0 /p 0 ) and K b = f (p a0 /p 0 ) 1,10 0,4 d 0 10 "S/G" 1,00 0,90 0,80 How to use please refer to page 00/08 Coefficient of discharge K dr / αw 0,3 0,2 0,1 0 0,2 0,3 0,4 0,5 0,6 0,7 Ratio of back pressure / set pressure p a0 / p 0 0,70 0,60 0,50 0,40 0,30 0,20 0,10 0,00 0,8 0,9 0,835 Back pressure correction factor K b 03/16 LWN 481.01-E
Accessories and Options Contents Chapter/Page Overview 04/02 Caps and Levers 04/03 Threaded connections 04/04 Flanged connections 04/05 Sealing surface 04/06 Soft seal material selection 04/08 Heating jacket 04/09 Installing instructions 04/10 Options LWN 481.01-E 04/01
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Compact Performance Safety Relief V
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General Type 437 Orifice diameter d
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Contents Type 459 05/01 Materials
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General Information General Applica
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Valve finder General How to find th
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Valve selection General Valve size
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How to use General Sample Determina
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How to use General 7 Base of capaci
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Sour gas service (H 2 S) General No
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Type Type 437 Type 437 Packed knob
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Page 35 and 36: Type 437 Capacities - Air Capacitie
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Type 462 Available designs - materi
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Type 462 Pressure temperature ratin
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Type 462 Order information - Spare
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Type 462 Approvals Europe Approvals
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Type 462 Capacities - US Units Capa
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Type 462 HDD Safety Relief Valves H
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Type 462 HDD Available designs - ma
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Type 462 HDD 4 5 6 Options Document
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Type 462 HDD How to order - Article
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Type 462 HDD Dimensions and weights
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Type 462 HDD Dimensions and weights
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Type 462 HDD Order information - Sp
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Type 462 HDD Approvals Europe Appro
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Type 462 HDD Capacities - US Units
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Accessories and Options Overview Op
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Accessories and Options Caps and le
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Accessories and Options Sealing sur
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Accessories and Options Balanced be
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Accessories and Options O-ring damp
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Accessories and Options Lift restri
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