Technical manual
Sylax
DN
25-350 mm
uksylax25_350 - Updated 20/09/2016
16
Version lug type with unthreaded holes, (permanent
downstream dismantling)
assembly by bolts
:
L3 = a/2 + b + c + j
L3 = minimum length under head of screw
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
j = thickness of washer under head of screw
Mounting in case of downstream pipework dismantling (see page 8).
Use nuts with reduced face-to-face dimensions between the butterfly
valve and the downstream flange.
Bolts and nuts
c
b
a
b
c
L1
ØV
L2
j
b
a
b
c
ØV
L1
c
b
a
b
c
L2
b
a
b
c
j
L3
j
b
a
c
Mounting in case of downstream pipework dismantling (see page 8).
Use nuts with reduced face-to-face dimensions between the butterfly
valve and the downstream flange.
For wafer type and lugs with unthreaded holes ; 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.
For wafer type and lugs with unthreaded holes ; assembly by
bolts :
L2 = a + 2b + c + j
L2 = minimum length under head of screw
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.
