3
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. 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).
2. Mark the position of both spring adjusting
washer pins (33) so the springs can be reset
to their original position upon reassembly.
3. Turn
each
spring
adjusting
nuts
counterclockwise until all tension is removed
and while supporting the spring chamber pull
the spring adjusting screw assembly (30)
through the spring retainer cap (35). When
free, carefully lower the spring chamber.
4. If not dismantling the spring chambers to
remove the springs and/or spring adjusting
washers, skip to step 7.
5. To remove the springs, remove the spring
chamber assemblies from the valve by
removing the clevis retaining rings (38) and
clevis pins (36). Remove the end caps (35)
and lift out the springs (17).
6. To remove the spring adjusting washer (32),
first grasp the spring adjusting washer pin
(33) and pull out.
7. Lift off the spring yoke (5) and piston rod
(14).
8. Mark the cover (2) and body (1) to ensure
proper
alignment
during
re-assembly,
remove the cover bolts (18) and remove the
cover from the body.
a. For 3
” and smaller valves, all remaining
components except the seat (19) should
come out with the cover.
b. For 4
” to 8” valves, the disc stem and
disc assembly may also remain in the
valve as the cover assembly is being
removed. In that case, the piston (3) will
be likely pushed out of the cylinder (16).
Remove it from the disc stem (15) and
continue removing the cover.
9. If the piston (3) had not been exposed while
the cover was removed, push on the disc (9)
to expose the piston (3) and remove it.
10. If the disc stem and disc assembly did not
remain in the valve when the cover was
removed, pull it from the cover.
11. Remove the gland (8), lantern ring (7, in 4
” to
8
” only), gland packing (6) and bushing (27)
from the cover.
12. Remove the seat ring follower screws (22),
seat ring follower (21) and seat ring (20)
from the disc (9).
13. Inspect all parts for wear and damage.
Replace all seals and any worn and/or
damaged parts.
ASSEMBLY
1a. Clean and polish all machined bearing and
sealing surfaces. Remove burrs and sharp
edges. Apply a light coat of lubricant on
sealing surfaces to assist in the assembly.
2a. Install new seat ring (20) on disc (9),
replace follower (21) and install seat ring
follower screws (22). Tighten but do not
distort follower ring.
3a. Lubricate and install disc stem seal (13) on
disc stem (15). Place disc stem/disc
assembly in body (1) centered on seat (19)
4a. Lubricate and install the bushing seal (28)
on the bushing (27) and install in the cover
(2).
5a. Install lantern ring (7) in cover (4
” to 8” only)
6a. Lubricate and install gland packing (6) and
gland seal (10) in gland and install in cover.
7a. Lubricate and install cover seal (11) on
cover. Carefully install cover (2) over disc
stem (15)
8a. Align cover with mark, install cover bolts
(18) and tighten.
9a. Lubricate and install piston rod seal (12)
10a. Lubricate and install piston seals (4) on
piston. Remove piston vent plug (29).
Install piston (3) into cylinder (16) until
firmly seated on shoulder of disc stem (15).
Align piston vent plug with hydraulic tubing
connection in cylinder (16).
11a. Place piston rod (14) on top of disc stem
(15) and spring yoke (5) on piston rod (14).
12a. Re-assemble spring chambers and re-
connect to valve body with clevis pins (36)
and retaining rings (38) and/or align spring
chambers with holes in spring yoke (5).
13a. Place adjusting screw washer (31) onto
both adjusting screw assemblies (30),
install through spring yoke (5) and end caps
(35) and thread into spring adjusting
washers (32).
14a. Simultaneously turn each adjusting screw
nut clockwise until spring adjusting washer
pins (33) are at original position.
15a. 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 flows
from vent port in piston. Apply pipe sealant
to vent plug (29) and install in piston.
Continue to fill reservoir until it is ¾ full. If
additional oil is needed, use non-foaming
AW32 hydraulic fluid. Re-install blue plastic
air vent plug (37)
16a. Reset closing speed control to original
position and tighten locknut.
17a. Slowly open inlet valve to introduce
pressure and check for leaks.
Содержание GA INDUSTRIES 625-D
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