Inspect seating surface and rubber O-ring
for wear and/or damage. Replace as
needed.
•
Valve Does Not Pass Flow
Verify valve is installed with the flow
arrow in the correct direction
Verify there
’s no debris in the valve
preventing it from opening.
•
Valve Slams
Inspect spring for damage, replace if
needed
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 on a flat, stable surface with the
flow arrow pointing down. For Figure 280 globe
style valves, remove the screws (7) and lift out
the seat (5), plug (4), spring (3) and bushing (2).
Note that because of the construction of 12
”
Figure 280 globe valves, the seat will need to be
retained before disassembly. Place a metal bar
or piece of wood across the seat in between the
retaining screws and secure to the valve flange
with C-clamps. Remove the retaining screws
and slowly open the C-clamps and remove. For
Figure 290 wafer style valves, unscrew the seat
from the body then lift out the plug, spring and
bushing.
Inspect the seat surface. Superficial marks and
discoloration are normal but replace the seat if it
is gouged or has grooves indicating the valve
had been leaking.
Inspect the plug for damage, especially the
upper and lower stem to ensure they have not
worn unevenly. If they are not round, it can lead
to misalignment and leakage so the plug should
be replaced. The rubber seat (6) is retained in
a
“dove-tail” groove in the seat (4) and can be
pulled out if damaged.
Inspect all parts for wear and damage. Replace
damaged parts.
REASSEMBLY
Reassembly is performed in reverse order from
disassembly. Clean all parts especially the
threaded, seating and sealing surfaces before
reassembling valve. Worn parts should be
replaced.
Install bushing (2) into body (1). Set spring (3)
over bushing (2). Install new seat O-Ring (6)
into dovetail groove in seat (4). Carefully install
plug (4) so that downstream stem enters spring
and bushing. Install seat (4) over upstream plug
stem.
If globe style Figure 280 install seat retaining
screws (7). Note that for 12-inch valves, the bar
and C-clamps must be used to compress the
spring so that the seat is flush with the flange
face before installing the retaining screws. If
wafer style Figure 290, thread seat (4) into body
Install valve in line with new gaskets, tighten
flange bolts, carefully introduce pressure and
check for leaks
REPLACEMENT PARTS
Genuine replacement parts are available from
your local VAG/GA Industries representative or
from the factory:
VAG USA, LLC
234 Clay Avenue
Mars, PA 16046 USA
Telephone: 724-776-1020
Fax: 724-776-1254
E-mail:
Please have the nameplate data available when
ordering parts.
WARRANTY
The Warranty for GA Industries valves is
included in our Terms and Conditions which can
be found here:
https://gaindustries.com/terms
