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or lose the cover gasket (8) unless it is to be
replaced.
6.
Remove the shaft lock pin (18) by threading
a screw into the tapped hole.
7.
With the disc and disc arm properly
supported, loosen the disc arm set screw
(12) and pull the shaft (11) out of the valve.
It may be necessary to drive out the shaft
from the opposite end.
NOTE: The outer bushing (14) and disc arm
key (19) should come out with the
shaft. Be careful not to lose the disc
arm key.
remove the inner bushing (13) from
the opposite side.
8.
Carefully lift the disc arm assembly out of the
body. Remove the disc nut pin (6B), disc nut
(6) and disc nut washer (6A).
9.
Remove the seat screws (5C), the seat
follower (5B) and the renewable seat (5A) or
metal seat washer (5D).
10. In the unlikely event it's necessary to remove
the body seat (2), the spring pins holding it
into the body must be compressed until they
no longer "bite" into the body. This is best
accomplished by compressing the seat pins
(2B) using "vice-grips" and pulling the pins in
a
radial
direction
centerline.
Inspect all parts for wear and damage.
damaged parts.
ASSEMBLY
The
valve
is
reassembled
disassembly sequence with consideration of the
following:
1a. Clean and polish all machined bearing and
sealing surfaces.
lubricant to assist in the assembly.
2a.
Ensure the disc arm key slides inside the
disc arm before installing the shaft lock pin
(18).
Ensure the shaft lock pin has
dropped into the groove provided for it on
the shaft.
3a.
Install the inner and outer bushings then
install the shaft packing.
plate (34) with seal (36). Install and tighten
the end plate bolts (35) while ensuring the
end plate seal (36) remains in the groove
provided for it in the end plate.
4a.
Lift the disc assembly several times to
ensure free closure with no metal-to-metal
contact.
5a.
Wrap the packing around the shaft and cut
on a 45-degree angle, staggering the cuts
with each ring.
6a.
Tighten gland bolts evenly until packing is
slightly compressed.
been introduced into the valve, re-tighten
evenly until leakage stops.
After the shaft is out,
towards
the
valve
Replace
by
reversing
the
Apply a light coat of
Install the end
After pressure has
7a.
Ensure cover gasket sealing surfaces are
clean and apply a thin coat of Permatex™
#2 to both surfaces. Tighten cover nuts in
an alternating pattern.
needed after pressure has been introduced.
8a.
Re-install the counterweight arm (30) with
key (30B) and tighten counterweight set
screws (30A).
9a.
Slide counterweight(s) onto shaft and lock
in place using set screws (31A).
counterweight arm and allow it to fall to
ensure free movement.
REPLACEMENT PARTS
Genuine replacement parts are available from your
local VAG/GA Industries representative or from the
factory:
VAG USA, LLC
9025 Marshall Road
Cranberry Township, PA 16066 USA
Telephone: 724-776-1020
Fax: 724-776-1254
E-mail:
info-ga@vag-group.com
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.
Part No. Part Name
1
Body
2
Body Seat
2A
Seat O-Ring
2B
Seat Pins
3
Disc with Center Pin
4
Disc Arm
5A
Renewable Seat
5B
Seat Follower
5C
Seat Screws
Metal Seat Washer (Opt'l)
5D
6
Disc Nut
6A
Disc Nut Washer
6B
Disc Nut Cotter Pin
8
Cover Gasket
9
Cover
10
Cover Bolt (and Nut)
11
Shaft
12
Disc Arm Set Screw
13
Inner Bushing
14
Outer Bushing
15
Gland
16
Gland Stud & Nut
17
Packing
18
Shaft Lock Pin
19
Disc Arm Key
30
Counterweight Arm
C'weight Arm Set Screw
30A
30B
Counterweight Arm Key
31
Counterweight(s)
31A
Counterweight Set Screw
34
Shaft End Plate
35
Shaft End Plate Screws
36
Shaft End Plate Seal
3
Re-tighten as
Lift
Std. Material
Cast Iron
Bronze or SS
Buna-N
Stainless Steel
Cast Iron/Steel
Ductile Iron
Buna-N
Bronze or SS
Stainless Steel
Bronze or SS
Steel
Steel
Stainless Steel
Fiber
Steel
Steel
Stainless Steel
Stainless Steel
Bronze
Bronze
Cast Iron
Steel
Teflon
Brass
Stainless Steel
Ductile Iron/Steel
Stainless Steel
Stainless Steel
Cast Iron
Stainless Steel
Steel
Steel
Buna-N
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