2
Lower heavy valves using slings or chains
around the valve body. Lubricate the bolts or
studs and insert around flange. Lightly tighten
bolts until gaps are eliminated. Torque bolts in
an alternating pattern in graduated steps. If
leakage occurs wait 24 hours and re-torque the
bolts but do not compress the gasket more than
50% or exceed bolt maximum torque rating.
If installed outdoors, below ground in a vault or
in an unheated area, adequate freeze protection
must be provided.
Sizes 10-inch and smaller Figure F284-D Anti-
Slam Surge Check Valves have enough
clearance to allow it to be bolted to most
butterfly valves. Refer to Table 1 on page 4 for
clearance dimensions. However, the plug shaft
in 12-inch size valves extends past the outlet
flange and will interfere with an adjacent
butterfly valve
’s operation.
PREVENTIVE MAINTENANCE
GA Industries Figure 284-D Anti-Slam Surge
Check Valves require no scheduled lubrication,
adjustment, or preventive maintenance but a
periodic visual inspection should be performed.
TROUBLESHOOTING
If the associated air valve slams shut, close one
or more of the restriction ports in the Anti-Slam
Surge Check Valve disc by installing pipe
plug(s).
WARNING
Removing the valve from the line or
disassembling the valve while there is pressure
in the valve body may result in injury or damage
to the valve
DISASSEMBLY
The valve should be removed from the line
before disassembly. A skilled technician with
proper tools should perform all work. No special
tools are required.
Set the valve, with the flow arrow pointing down,
on wooden blocks or 2 x 4
’s under the flange
outboard of the bronze seat so that it can drop
out of the body. Ensure the surface beneath the
valve will not damage the internal components
when they drop out of the valve.
Place a metal rod on top of the stem inside the
bushing. Hit the top of the rod with a hammer or
mallet and the internal components should drop
out of the valve body.
Inspect the seating surfaces. Superficial marks,
or discoloration on the mating surface of the
poppet are normal. The rubber seat is retained
in a
“dove-tail” groove in the seat and can be
pulled out if damaged
Inspect the plug for damage, especially the
guiding surfaces to ensure they have not worn
unevenly. If they are not round, it can lead to
misalignment and sticking so they should be
replaced.
REASSEMBLY
Clean all parts especially the seating and
sealing surfaces before reassembling valve.
Worn parts should be replaced.
Set valve body on a flat surface with the flow
arrow pointing down. Install bushing (2) into
body (1). Set spring (3) over bushing (2). Install
poppet stem in bushing. Lubricate and install
new O-ring in dove-tail groove in seat being
careful not to damage or cut the O-ring during
installation.
Lubricate the O-Ring (6) and install in the groove
on the OD of the seat. It is very important to
lubricate this O-ring to prevent damage during
installation which will cause a leak and not allow
the seat to enter the body.
Place the seat into the valve making sure the
seat stem enters the poppet and the poppet
enters the bushing.
Using two hands, push down on the seat to pop
it into the body. Larger valves may require a 2 x
4 to be placed across the seat and hit with a
hammer.
Install valve in line with new gaskets, tighten
flange bolts, carefully introduce pressure and
check for leaks
