Vag GA INSTRUMENTS K-1255 User manual

INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
10”to 16”Figure 626-D Drawing K-1255
Sewage Surge Relief Valve
TABLE OF CONTENTS
Introduction ….………………………… 1
Function ……………………………….. 1
Receiving & Storage .....……………… 1
Installation ......…………………………. 1
Operation ………………………………. 1
Valve Construction ......………………. 1
Start-Up ...………………………………. 2
Preventive Maintenance ....………….. 2
Trouble Shooting ...…………………… 2
Disassembly ....………………………… 2
Assembly ....……………………………. 3
Replacement Parts List..……………….. 3
Warranty .……………………………….. 3
Assembly Drawing/Parts Location........4-5
234 Clay Avenue • Mars, PA 16046 USA
Telephone [phone] • Fax [phone]
E-mail: [e-mail]
Manual Number 626.02-IOM-061922

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INSTALLATION, OPERATION and
MAINTENANCE
10”to 16”Figure 626-D
Sewage Surge Relief Valve
INTRODUCTION
This manual will provide the information to properly
install, operate and maintain the valve to ensure a
long service life. The Figure 626-D Sewage Surge
Relief Valve is ruggedly constructed to provide years
of trouble-free operation with minimal maintenance.
CAUTION
The valve is NOT recommended for use with toxic or
highly corrosive fluids, fuels or fluids containing
hazardous gases
The Shop Order (SO) Number, Figure Number, size
and pressure rating are stamped on a nameplate
attached to the valve. Please refer to the SO number
when ordering parts.
FUNCTION
The Figure 626-D Sewage Surge Relief Valve is used
to protect systems against damaging surges resulting
from a sudden stoppage of flow. The valve is
normally closed and opens when the inlet pressure
increases to a pre-set pressure to discharge excess
pressure out of the system. The valve opens as far
and stays open for as long as needed to limit the
pressure rise. It slowly closes as the pressure
subsides below the opening pressure. The valve is
designed to accommodate solids and other matter
that may be present in sewage systems without
clogging.
RECEIVING AND STORAGE
Inspect the valve upon receipt for damage during
shipment. Carefully unload all valves to the ground
without dropping.
The valves should remain in a clean, dry, and weather
protected area until installed.
INSTALLATION
The Figure 626-D is a wye body valve with ANSI
Class 125 flanged connections for installation in a
horizontal pipe.
Consult the drawings of record to verify the
configuration supplied and installed.
These valves are large, heavy, and awkward to
handle, ensure proper handling techniques are
employed. Handle heavy valves using slings around
the valve body and/or by the lifting eyes.
Prior to installation ensure all debris, packing material
or other foreign material has been removed from both
ports.
Install the valve in the proper flow direction. The
discharge piping connected to the outlet of the valve
must be unobstructed and unpressurized.
If installed outdoors, below ground in a vault or in an
unheated area, adequate freeze protection must be
provided.
An adequate isolating valve should be installed
between the valve and the pipeline or system to
facilitate maintenance.
The valve is not designed to support adjacent
equipment, piping loads should not be imposed on the
valve and large valves should be properly supported.
Ensure mating flanges are square and parallel to the
valve flanges before tightening flange bolts.
Flat-faced flanged valves should be mated with flat-
faced flanges and full-face gaskets. If ring gaskets
are used the bolt material shall be ASTM A307 Grade
B (or equivalent). Higher strength bolting should only
be used with full-face gaskets.
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.
OPERATION
The Figure 626-D surge relief valve is held closed by
the compression of a spring. When the force of the
system pressure acting on the face of the valve disc
exceeds the spring force, the valve will lift off its seat
permitting a discharge of fluid from the system. The
valve will open as far as needed to discharge fluid at
the rate necessary to prevent a further rise in
pressure.
As the valve opens it freely draws oil from the
reservoir into the piston chamber.

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As the pressure subsides the spring force will push
the valve closed, forcing oil back into the reservoir
through a needle valve that controls the speed at
which the valve closes.
VALVE CONSTRUCTION
The standard Figure 626-D surge relief valve has a
cast iron body and cover, stainless steel body seat,
stainless steel disc stem, resilient disc seat and an
alloy steel spring housed in a fabricated steel spring
chamber.
The valve incorporates a self-contained hydraulic
system to control the speed at which the valve closes
during pressure subsidence.
Refer to Pages 4 and 5 for standard construction and
parts identification
Refer to the List of Materials submitted for the order if
non-standard materials were provided.
START-UP
The valve generally does not require any calibration
or adjustment prior to start-up. The pressure at which
the valve opens is set at the factory per the
Engineer’s specification and indicated on a tag wired
to the valve. This pressure is typically 10 to 15%
higher than the highest pressure that would be
present at the valve’s inlet under normal operation.
The valve is shipped from the factory with the oil
reservoir full of oil and a pipe plug in the fill port to
prevent spillage during transit and installation.
IMPORTANT: Prior to start-up remove the pipe plug,
check to make sure reservoir is ¾” full and replace
with the blue plastic vented plug that is wired to the
reservoir.
If additional oil is needed, use non-foaming AW32
hydraulic fluid.
The closing speed needle valve (30) should be initially
opened ¼ turn.
Since the relief valve’s opening pressure is always
higher than the “normal”pressure, an abnormally high
pressure is needed to test the valve’s operation.
This may be accomplished by throttling valve but
most of the time the pumping system is started then
shut down and the reaction of the relief valve is noted.
Small adjustments to the closing speed may be made
if needed. Loosen lock nut on closing speed control
valve and turn screw clockwise to slow closing speed,
counterclockwise to increase closing speed.
CAUTION: Do not completely close the needle valve
as this will prevent the relief valve from closing once it
has opened.
PREVENTIVE MAINTENANCE
Figure 626-D sewage surge relief valves require no
routine lubrication, adjustment, or preventive
maintenance.
A monthly inspection should be performed for the first
6 months of operation to ensure there is no external
fluid leakage or audible evidence of water leaking
through the closed valve.
Thereafter, a quarterly visual inspection should be
performed.
TROUBLESHOOTING
•Valve Fails to Open at Desired Pressure
- Set pressure too high –adjust spring
- Inlet isolating valve closed –open valve
•Valve Fails to Close
- Set pressure too low –adjust spring
- Closing speed valve closed –adjust ¼ turn
open
- Closing speed hydraulic tubing kinked or
clogged –repair/replace/clean tubing
•Leakage Through Valve When Closed
- Debris lodged under seat –inspect/clear
- Damaged disc seat –inspect/replace
•Valve Closes Erratically
- Low or no oil in reservoir –fill ¾ full
- Air in hydraulic line/dashpot chamber- bleed
air
•Leakage from Weep Hole in Cover
- Worn stem seals (19) - Replace
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
WARNING
Follow all applicable safety regulations and codes and
read and understand all instructions before
undertaking disassembly.
DISASSEMBLY
Figure 626-D surge relief valves can be serviced
while the body remains connected to the pipeline. A
skilled technician should perform all work. No special
tools are required but given the size and weight of the
valve’s components overhead lifting capability is
necessary
First ensure there is no pressure within the valve and
operating equipment is tagged and locked out. Refer
to Pages 4 and 5 for parts identification and location.
Ensure all necessary replacement parts are on hand
before commencing service. Disassemble only as far
as needed to inspect/replace worn parts.
1. Ensure there is no pressure within the valve
and operating equipment is locked out.

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2. Loosen a fitting and drain the oil from the
reservoir into a clean container for re-use
after re-assembly. Note position of closing
speed control valve. Remove the tubing
between the valve cover and reservoir.
Remove the reservoir mounting bolts (24A)
and the reservoir (24).
3. Mark the position of the adjusting stem (26)
or measure its height above the top of the
spring chamber (22).
4. Loosen the adjusting stem lock nut (25) and
turn the adjusting stem counterclockwise to
de-compress the spring until all tension is
removed. Re-tighten the stem lock nut (25).
5. Mark the cover (2) and body (1) to ensure
proper alignment during re-assembly.
6. Place a strap/sling around the adjusting stem
(26) near the top of the spring chamber (22)
and around the cover (2) and simultaneously
support both with overhead lifting.
7. Remove the cover bolts (29) and carefully
extract the cover (2) from the body (1). All
the remaining components except the body
seat (6) will come out with the cover.
8. Move the cover assembly to a convenient
work area and support on blocks so the
spring chamber is vertical to facilitate further
disassembly.
9. Remove the spring chamber bolts (28) and
lift off the spring chamber (22), spring (23)
and spring guide (27).
10. Using a chain/strap wrench, grasp the disc
(3) around its outside diameter, loosen and
remove the disc stem nut (7A). DO NOT
GRASP THE STEM (7) as any scoring will
damage the rod wiper (21).
11. Remove the disc stem washer (7C), piston
follower (15), the piston ID seal (16) and the
piston (12).
12. Remove the gland screws (11A) and gland
(11).
13. Extract the stem/disc assembly from the
cover.
14. Remove the disc seat ring screws (9), disc
seat ring follower (5) and disc seat ring (4).
15. Remove the two stem seals (19), lantern ring
(10) and rod wiper (21).
16. Typically, the piston bushing (14), upper
bushing (8) and lower bushing (8A) do not
need to be removed as the associated seals
can be replaced without removing these
components.
17. Inspect all parts for wear and damage.
Replace worn and/or damaged parts.
ASSEMBLY
The valve is reassembled by reversing the
disassembly sequence with consideration of the
following:
1a. Clean and polish all machined bearing and
sealing surfaces. Remove burrs and sharp
edges. Apply a light coat of lubricant to
assist in the assembly.
2a. Make sure the hole in the piston follower (15)
aligns with the pipe plug in the top of the
piston (12).
3a After the spring (23), spring guide (27) and
spring chamber bolts (28) have been re-
assembled, turn adjusting stem (26)
clockwise until the spring (22) is slightly
compressed to stabilize it during final
assembly.
4a. Due to the angle at which it is installed, be
especially careful when inserting the cover
assembly into the body to make sure the
cover seal (20) is not damaged.
8a. Loosen the stem lock nut (25). Turn
adjusting stem (27) clockwise until it is at
original position, tighten adjusting stem lock
nut (25).
9a. Install reservoir (24) and re-connect control
piping. Threaded connections should be
sealed with oil-compatible pipe sealant, not
Teflon tape. Open speed control valve fully
and slowly add oil to reservoir until it is ¾
full. If additional oil is needed, use AW32
hydraulic fluid.
10a.Reset closing speed control to original
position. Tighten locknut.
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: [phone]
Fax: [phone]
E-mail: [email protected]
Please have the nameplate data available when
ordering parts. Identify needed part(s) by Shop Order
(SO) Number, Figure Number, valve size and
individual part number.
REPAIR KITS
Soft Goods Kit includes Items 4, 12A, 13A, 14A, 16,
17, 18, 19, 20, 21, 33 and 35
Size
Kit Number
Part Number
10”
K10
2-80-25000-436
12”
K12
2-80-25000-437
14”
K14
16”
K16
All other parts ordered individually. Consult factory
for larger sizes.
WARRANTY:
The Warranty for GA Industries valves is included in
our Terms and Conditions which can be found here:
https://gaindustries.com/terms

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Part No. Part Name Std. Material
1 Body Cast Iron
2 Cover Cast Iron
3 Disc Ductile Iron
4 Disc Seat Ring Thiokol
5 Disc Seat Ring Follower Stainless Steel
6 Body Seat Stainless Steel
7 Disc Stem Stainless Steel
7A Disc Stem Nut Steel
7B Disc Stem Washer Steel
7C Disc Stem Lock Washer Stainless Steel
7D Disc Stem Lock Screw Stainless Steel
8 Upper Bushing Bronze
9 Lower Bushing Bronze
10 Lantern Ring Bronze
11 Gland Bronze
11A Gland Screws Steel
12 Piston Steel
12A Piston Seal Buna N Rubber
13 Piston Liner Bronze
13A Piston Liner Seal Buna-N Rubber
14 Piston Bushing Bronze
Part No. Part Name Std. Material
14A Piston Bushing Seal Buna-N Rubber
15 Piston Follower Steel
16 Piston ID Seal Buna-N Rubber
17 Liner Bushing Seal Buna-N Rubber
18 Gland Seal Buna-N Rubber
19 Stem Seal (2) Buna-N Rubber
20 Cover Seal Buna-N Rubber
21 Lower Bushing Wiper Buna-N Rubber
22 Spring Chamber Steel
23 Spring Alloy Steel
24 Oil Reservoir Steel
25 Adjusting Stem Lock Nut Steel
26 Adjusting Stem Aluminum Bronze
27 Spring Guide Steel
28 Spring Chamber Bolts Steel
29 Cover Bolts Steel
30 Flow Control Valve Commercial
31 Inspection Plug Malleable Iron
34 Vented Plug Plastic
35 Upper Bushing Seal Buna-N Rubber
36 Lower Bushing Set Screw Steel
42 Reservoir Mounting Screws Steel

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