常用管件和阀件底局部阻力系数c值管件和阀件名称E值标准弯头45°,£=0.3590°,£=0.7590°方形弯头1.3180°回转头1.5活接管0.4①*30°R/d45°60°75°90°105°120°弯管1.50.080.110.140.160.1750.190.202.00.070.100.120.140.150.160.17突然扩大A/A,00.10.20.30.40.50.60.70.80.91C10.810.640.490.360.250.160.090.040.011突然缩小A>/A200-10.20.30.40.50.60.70.80.91%0.50.470.450.380.340.30.250.200.150.090标准二通管中0.4£=1.5£=1.3£=1闸阀全开3/4开1/2开1/4开0.170.94.524截止阀全开£=6.41/2开£=9.5(球心阀)碟阀a5°10°20°30°40°45°50°60°70°J0.240.521.543.9110.818.730.6118751旋塞G5°10°20°40°60°C0.240.521.5617.3206单向阀摇板式£=2球形式£=70角阀(90°)5底阀1.5波水器2(或波水网)水表(盘形)7沿程阻力损员失系数表管子内径mm50751001251501752C<0225X0.04550.04180.0380.03520.03320.03160.03040.0293管子内径mm250275300325350400450500X0.02840.02760.0270.02630.02580.0250.02410.0234沿程损失:H=九x-fd2g局部损失:h—j2g。