Technical manual
Sylax FM - CNPP
uksylaxfm_cnpp - Updated 12/01/2018
17
Bolts and nuts
For wafer type body ; assembly by rods :
L1 = a + 2(b+c)
L1 = minimum length of rods
a = width of the butterfly valve (face to face dimension)
b = thickness of the flange (customer)
c = thickness of thickness of nut + exceeding length of the rod.
c
b
a
b
c
L1
ØV
For wafer type body ; assembly by bolts :
L2 = a + 2b + c + j
L2 = minimum length of rods
a = width of the butterfly valve
b = thickness of the flange (customer)
c =
thickness of thickness of nut + exceeding length of the rod
j = thickness of washer at the head of the screw.
L2
j
b
a
b
c
ØV
For lug type body ; assembly by screws :
L5 ≤ b + e + j avec L6 ≥ L5 - (b + j)
L5 = maximum length under head of screw
L6 = minimum length of the threading of the screw
a = width of the butterfly valve (face to face dimension)
b = thickness of the flange (customer)
e = maxi depth of screw
j = thickness of washer
L7
L6
j
e
b
ØV
