# 7.3 L, L over D, K, and Kv for Conventional Type Valves

A 100 mm class 600 steel angle valve, has a full area seat.

Calculate its resistance coefficient K, flow coefficient Kv, the equivalent length of it L/D, and the length for complete turbulent L.

    [1]:

    from fluids.units import *
    NPS, Di, Do, t = nearest_pipe(Do=0.103*u.m, schedule='80')
    fd = 0.0165 # provided - note equivalent length is proportional to this value
    d = 0.0972*u.m # diameter of seat
    K = K_angle_valve_Crane(D1=d, D2=Di, fd=fd, style=1)
    Kv = K_to_Kv(K, d)
    L_D = L_equiv_from_K(K, fd)
    L = L_D*d

    print('Loss coefficient = %s' %K)
    print('Valve flow coefficient = %s' %Kv)
    print('Equivalent length = %s' % L_D)
    print('Length for complete turbulence = %s' %L)

    Loss coefficient = 2.47296378211 dimensionless
    Valve flow coefficient = 240.316529308 meter ** 3 / hour
    Equivalent length = 149.876592855 dimensionless
    Length for complete turbulence = 14.5680048255 meter

The values given in the solution are K=2.475, Kv = 240.2, L/D=150, and L = 14.6.