5
To install the limit switch on the visual position
indicator assembly:
•
Attach the limit switch mounting bracket
(29) to the channel bracket (25) using
the limit switch bracket mounting screws
(30).
•
Mount the limit switch (28) on the
bracket using the limit switch mounting
screws (31) so that the switch
’
s
“
whisker
”
is on the left side of the flag
(23) when looking at the flag.
Typically, the limit switch contacts close when
the valve is closed. Adjust the switch position so
that the indicator flag (23) actuates the switch
when the valve is fully closed. DO NOT
ADJUST THE FLAG POSITION.
Figure 3
Item
Description
Material
19
Lower Bushing
Brass
20
Roller
Stainless Steel
21
Roller O-Ring
Buna-N Rubber
22
Retaining Ring
Stainless Steel
23
Indicator Flag
Stainless Steel
24
Indicator Flag Screw & Washer
Stainless Steel
25
Channel Bracket
Aluminum
26
Upper Bushing w/Flush Port
Stainless Steel
27
Upper Bushing O-Ring
Buna-N Rubber
28
SPDT Limit Switch
See Switch for
Model Number
29
Switch Mounting Bracket
Aluminum
30
Bracket Mounting Screw & Nut
Stainless Steel
31
Switch Mounting Screw
Stainless Steel
BACKFLOW ACTUATOR OPERATION
The actuator is not designed to open the valve
with pressure at its outlet. Therefore, prior to
using the actuator, close the pump isolation
valve and relieve line pressure between the
check valve and isolation valve. To open the
valve, loosen the jam nut (15) turn the T-handle
clockwise. The handle should turn easily.
When resistance is felt, the disc has reached its
body stop and is in the fully open position. Then
open the isolating valve to allow backflow
through the valve.
WARNING
Relieve line pressure before using back flow
actuator or damage may occur.
Upon completion of the backflushing operation,
turn the T-handle fully counterclockwise to allow
the valve disc to return to the closed position.
Lock the backflow actuator in the closed position
with the jam nut (15). The system is again ready
for normal operation.
BACKFLOW ACTUATOR FIELD
INSTALLATION
•
Isolate the rubber flapper check valve,
depressurize and drain pipeline.
WARNING
Removal of the bottom plug while under
pressure may cause bodily harm.
•
Remove the pipe plug in the bottom
boss of the valve.
•
Inspect the backflow rod (16) and
ensure the T-handle has been turned
fully counterclockwise. The rod should
extend
about 1” past the end of the
brass backflow tube (14). Apply thread
sealant to brass threads.
•
Insert the threaded end of the assembly
into the valve boss. Slowly turn the
assembly into the boss. Continue
turning the assembly into the valve for a
tight fit.
•
Introduce pressure and check for leaks.
Tighten if needed.
