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3.
Loosen and remove the gland stud nuts (16),
slide off the gland (15) and remove the shaft
packing (17).
4.
Remove the end plate bolts (35), the end
plate (34) being careful not to lose or
damage the end plate seal (36) unless it is to
be replaced
5.
Remove the cover bolts (10) and lift off the
cover (9).
If necessary, carefully pry the
cover off using a cold chisel between the
body and cover. Be careful not to damage
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. Remove the link (28) and pull the plunger
(22) from the cushion chamber.
11. 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.
NOTE: If re-assembling with counterweight
and cushion chamber assembly on
left hand size, shaft lock pin is
installed in hole on right side of
valve, looking at the inlet.
After the shaft is out,
towards
the
valve
Replace
by
reversing
the
Apply a light coat of
3a. Lift the disc assembly several times to
ensure free closure with no metal-to-metal
contact.
4a. Install the inner and outer bushings then
install the shaft packing. Install the end 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
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.
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.
after pressure has been introduced.
8a. Replace plunger O-ring (23) if necessary,
lubricate and install plunger (22) into cushion
chamber (25) being careful not to damage
O-ring. Move it up and down several times
to ensure free movement.
9a. Re-install the lever (29) and counterweight
arm (30) with key (30B) and tighten
counterweight set screws (30A).
10a. Connect lever (29) to the link (28) using pin
(29B) and secure with cotter pin (29C).
Tighten lever set screw (29A).
11a. Slide counterweight(s) onto shaft and lock in
place
using
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
234 Clay Avenue
Mars, PA 16046 USA
Telephone: 724-776-1020
Fax: 724-776-1254
E-mail:
quotes-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.
3
After pressure has
Re-tighten as needed
set
screws
(31A).
Lift
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