INSTAFLOW
8
The pressure relief valve is designed to discharge
water when there is a fault in the system.
In order to give a visible indication of the
operation and to avoid damage to the property,
the valve must connect to a discharge pipe
(g.4) which must conform to the following
requirements:
a. Discharge should be via an air break within
500mm of the pressure relief valve.
b. Must not exceed hydraulic resistance of
a straight 9 metre length pipe without
increasing in bore.
c. Must fall continuously throughout its length.
d. Outlet pipe from tun dish must be one pipe
size larger than the inlet pipe.
e. Must be of metal.
f. Must discharge to a safe and visible position.
g. The pipe diameter to tun dish must not be
smaller than the diameter of valve outlet.
h. There must be a 300mm straight drop below
tun dish before the rst bend.
Pressure
(expansion)
relief valve
500mm
max
Pipe close
to wall
25mm
100 to
150mm
max
Must be larger
than inlet pipe
Inlet pipe
300mm
min
Fig.4
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