'UDLQDJH DQG 6HZDJH À :DVWH :DWHU 7UDQVSRUW ... - WILO

Planning guidePressure lossesFactors for adapting to other materials/older pipesk bPipe type0.1 new galvanized steel pipes0.8 newly rolled steel pipes, new plastic pipes1.0 new cast-iron pipes, bitumen coated cast-iron pipes1.25 older surface corroded cast-iron pipes1.5 newly galvanised steel pipes, cleaned cast-iron pipes1.7 encrusted pipes2.0 new concrete pipes, medium-gloss2.5 Stoneware pipes3 new concrete pipes, flat line markings15-30 Cast-iron pipes with light to heavy encrustationsLosses in valves and pipe line contentsValve type Unit Nominal diameterDN 40,1¼DN 32,1½DN 50,2DN 65,2½DN 80,3DN 100 DN 150Non-return valve K V m 3 /h - - 158 267 405 632 1423Non-return ball valve with flange K V m 3 /h - - 87 136.5 267 396 890Non-return ball valve with female thread K V m 3 /h 26 54 70 115 180 - -Gate valve K V m 3 /h - - 160 280 470 830 2000Pipe contents l/m 0.8 1.3 2.1 2.9 4.3 8.2 17Formula for calculating the losses in valvesΔ PV =Q [m³/h] ²( K V [m³/h] )Q = volume flow in the duty pointK V = Flow coefficient from tableExampleNon-return ball valves with flange, DN 80,dutypoint 40 m 3 /hΔ PV =( )40 2= 0.022 bar = 0.22 m26712 Wilo Water Management catalogue – 50 Hz – Drainage and sewage – Waste water transport and dewatering – Edition 2012 – Subject to change without prior notice