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SECTION 2 ITEM 1040
DATED NOVEMBER 2012
SUPERCEDES MAY 2010
MODEL 3DV THREADED – STRAIGHT
TRIPLE DUTY COMBINATION VALVE
1.0 INTRODUCTION:
1.1 The Aurora Model 3DV Triple Duty Combination Valves
are designed for installation on the discharge side of
centrifugal pumps. The Aurora Triple Duty Combination
Valve incorporates two functions in one valve:
• Flow regulator valve
• Positive shut-off valve
2.0 INSTALLATION:
2.1 Mount 2" and 2½" valves with the stem in a vertically
up or horizontal position and the flow arrow (Cast in the
valve body) aligned with the direction of flow.
2.2 Install valve in a location which allows easy access for an
adjustment wrench and flow meter connections.
2.3 Install with the equivalent of at least 10 diameters of
straight pipe, sized to the 3DV threaded valve, upstream
of the valve and the equivalent of at least 5 diameters of
pipe downstream of the 3DV threaded valve.
2.4 Once a flow rate has been set, adjust the memory stop
located on the stem of the 3DV threaded valve (see below
for memory stop adjustment instructions). The memory
stop allows the valve to be closed and re-opened to the
same balance position.
3.0 MEMORY STOP ADJUSTMENT INSTRUCTION:
Valve is shown
Valve Plug is rotated to
in open position.
selected balance position.
Memory Stop
Memory stop is rotated
has not been set.
until it intercepts the stop on
cover. Tighten lock screw on
memory stop.
4.0 CLAPPER SEAL REPAIR:
Aurora Model 3DV Threaded Triple Duty Combination valves
are equipped with Buna-N clapper seals. If the clapper seal
is damaged, it can be replaced by removing the clapper and
installing a new seal (see steps 1-3 below).
Step 1
Step 2
Place the outer edge of the
Using a blunt screwdriver,
seal into the clapper groove
force the inside lower edge
as shown.
of the seal into the clapper.
10
Valve plug may be
closed and re-opened
to same balance
position.
Remove all sharp edges
from the screwdriver to
prevent damage to the seal.
Step 3
As the seal is pressed into
the groove, maintain force
on the portion of the seal
that has been installed. This
will prevent elongation and
excessive build-up of closing
portion.
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