Vag 220-DS, Operation And Maintenance Manual

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3
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. After the shaft is out,
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 towards the valve
centerline.
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. Apply a light coat of
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. 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.
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. After pressure has
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. Re-tighten as
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). Lift
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
Std. Material
1 Body Cast Iron
2 Body Seat Bronze or SS
2A Seat O-Ring Buna-N
2B Seat Pins Stainless Steel
3 Disc with Center Pin Cast Iron/Steel
4 Disc Arm Ductile Iron
5A Renewable Seat Buna-N
5B Seat Follower Bronze or SS
5C Seat Screws Stainless Steel
5D
Metal Seat Washer (Opt’l)
Bronze or SS
6 Disc Nut Steel
6A Disc Nut Washer Steel
6B Disc Nut Cotter Pin Stainless Steel
8 Cover Gasket Fiber
9 Cover Steel
10 Cover Bolt (and Nut) Steel
11 Shaft Stainless Steel
12 Disc Arm Set Screw Stainless Steel
13 Inner Bushing Bronze
14 Outer Bushing Bronze
15 Gland Cast Iron
16 Gland Stud & Nut Steel
17 Packing Teflon
18 Shaft Lock Pin Brass
19 Disc Arm Key Stainless Steel
30 Counterweight Arm Ductile Iron/Steel
30A
C’weight Arm Set Screw
Stainless Steel
30B Counterweight Arm Key Stainless Steel
31 Counterweight(s) Cast Iron
31A Counterweight Set Screw Stainless Steel
33
Cover Plug (18” & 20” only) Steel
34 Shaft End Plate Steel
35 Shaft End Plate Screws Steel
36 Shaft End Plate Seal Buna-N