3
First ensure there is no pressure within the valve and
operating equipment is tagged and locked out. Refer
to pages 4 & 5 4 for parts identification.
It is not necessary to disassemble the entire valve to
replace the shaft packing, follow steps 1 to 3 and 5a.
1. Ensure there is no pressure within the valve
and operating equipment is locked out.
2. Remove the counterweight retainer cotter
pins (54) and the counterweight pin (52) from
each counterweight arm. Slide the
counterweight
retainer
ring
(51)
and
counterweights (31) off the counterweight
arm
(19).
Loosen
or
remove
the
counterweight arm set screws (53) from
each arm and slide them off the shaft (11)
being careful not to lose the keys (50).
3. Remove the cover bolts and nuts (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 O-ring (8) unless it is to be
replaced.
4. Loosen and remove the gland stud nuts (16),
slide off the glands (15) and remove the
shaft packing (17) from each side.
5. With the disc and disc arm properly
supported, loosen the disc arm set screws
(12), remove the gib head keys (49) and pull
the shaft (11) out of the valve. It may be
necessary to drive out the shaft from the
opposite end with a sledgehammer and a
block of wood to prevent damaging the end
of the shaft.
NOTE: The bushing (13) on the opposite
side should come out with the shaft.
After the shaft is out, remove the
other
bushing
(13)
from
the
opposite side. There are two
threaded holes in the bushing to
facilitate removal.
6. Carefully lift the disc arm assembly out of the
body. Remove the cotter pins (41), washers
(42) and disc center pin (3A) to separate the
disc (3) from the disc arm (4).
7. If necessary, remove the disc clevis bolts
(36) and disc clevis (35) from the disc (3).
8. Remove the seat follower screws (5B),
follower ring (5A) and resilient seat (5) from
the disc.
9. In the unlikely event it
’s necessary to remove
the body seat (2), remove the seat screws
(5C) and body seat (2).
Inspect all parts for wear and damage. Replace
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, especially the shaft (11)
surfaces on which the gland packing (17)
seals. Apply a light coat of lubricant to assist
in the assembly.
2a. Ensure the disc/disc arm assembly is
properly supported while installing the shaft.
Install the bushings on both ends. The gland
(15) can be used to retain the bushing on the
opposite side as the shaft is installed. It may
be necessary to drive the shaft through the
disc arm and bushings.
3a. Install the gib head keys (49) and lift the disc
assembly several times to ensure free
closure with no metal-to-metal contact.
4a. Packing (17) is a set of 4-V-rings plus male
and female end pieces. Lubricate all pieces
and install the male end piece first, then the
V-rings with the open end facing inward,
being careful not to cut or damage them,
followed by the female end piece.
5a. Install gland (15) and gland nuts (16).
Tighten nuts evenly until packing is slightly
compressed. After pressure has been
introduced into the valve, re-tighten evenly
until leakage stops. Do not over-compress!
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. Identify needed part(s) by Shop Order
(SO) Number, Figure Number, valve size and
individual part number.
WARRANTY
The Warranty for GA Industries valves is included in
our Terms and Conditions which can be found here:
https://gaindustries.com/terms
