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AYLESBURY KB VALVE p7
25 OPENING WATER LEVEL (LWL) When the
actuator tube is held horizontal, the
opening water level is indicated by a line
on the opening buoy. Identify the desired
minimum water level & measure the
distance from the centre line of the valve;
this is Y.
26 Adjust the length of the chain from
the buoy to the hanger to match the
following:
Chain length = Y - 274mm
Do not cut the chain, loop any excess
chain on to the hanger.
27 Unhook the Float Adjusting Peg and
move the float along the chain so the
distance from the Hanger to the Float
Peg is as follows:
X - 190mm
28 The highest closing water level (X = 210)
can be achieved by having no spare
chain links between the hanger and the
float adjusting peg. The lowest closing
water level (X = 1610) can be achieved
by having the float touching the top of
the opening buoy whilst using all of the
available chain (last link on hanger).
29 Applications where the top water level
(TWL) can rise after the valve has closed
will cause the chain to become slack. A
cable tie/ratchet strap should be fitted
over the float adjusting peg in such a
way as to prevent the chain from slipping
off. Ensure the chain cannot become
entangled with tank tie bars etc.
IT MAY BE EASIER TO ADJUST THE CHAIN
LENGTH BEFORE INSTALLATION.
TESTING
Before leaving the installation, manually move
the valves to test operation a number of times,
ensuring that they move freely from the open
to the closed position and from the closed to
the open position.
Where a valve has not been in operation for
one month it is also recommended that the
above procedure is carried out.
