Cashco POSR-2 - Manual (Page 8)

IOM-POSR-2 8
the bolts (17) before replacing into bolt hole.
Fin ger-tighten nuts (18).
41. Observe through opening in top of spring
cham ber (2) to ensure the concentricity of the
recess in the spring button (16) with the top
opening. It may be necessary to use an awl
or similar tool to realign the spring button (16)
as much as possible. The spring chamber (2)
is not tightened down, and may be temporar-
ily “shifted” to help ensure alignment for the
adjusting screw (19) en gage ment.
42. Place lubricant onto the upper exposed threads
of the spring chamber’s (2) adjusting screw
(19) opening. Place lubricant onto the ad just ing
screw (19) lower-end threads. Engage adjust-
ing screw (19) back into spring cham ber (2)
by rotating CW (viewed from above). Engage
only until resistance is made with the range
spring (15) via the spring button (16).
43. Realign the spring chamber (2) fl ange with the
body (1) fl ange, and wrench-tighten bolting
(17, 18) in an al ter nat ing, crossing pattern.
Final tightening should be done with a torque
wrench to 15 ft.-lbs. (20 N-M).
44. Continue CW rotation (viewed from above) of
ad just ing screw (19) until locknut (20) touches
spring chamber (2). Back adjusting screw (19)
out by rotating CCW (viewed from above) two
revolutions. This position will ap prox i mate the
pressure setpoint prior to dis as sem bly if the
locknut (20) is only loosened two revolutions
as directed in article 2. previous, this subsec-
tion.
45. Reconnect pilot valve (PV) to main valve (MV).
See Figures 6, 7 and 8 for correct orientation.
Pressure leak test the complete assembly per
Section VII.D.
D. Main Valve (MV):
1. General Note: The actuator/topworks section
of the main valve (MV) is suffi ciently “heavy”
for the 3" and 4" (DN80 and 100) body sizes
that the procedures following are written to in-
clude overhead hoisting. Additionally, fol low ing
the procedure will ensure that the internals
subassembly (IS) will not “fall from within the
cylinder (3)” when the cylinder (3) is oriented
vertically, when gravity overcomes seal (12)
friction.
WARNING
Never replace bolting (17, 18) with just any bolting if lost.
Bolt heads and nuts are marked with spec i fi ca tion iden-
tifi cation markings. Use only proper grades as replace-
ments.
For the 1" through 2" main valve (MV) body
sizes, the actuator/topworks is not so heavy
that an overhead hoist is re quired. However,
if an overhead hoist is not used, im prop er
handling of the removed cylinder (3) and
internals subassembly (IS) can still result in
the internals sub as sem bly (IS) “falling from
within the cyl in der (3)” by gravity, so the above
“warning statement” is still valid.
2. Using an overhead hoist, rig the main valve
(MV). Lift and securely place the main body
(1) in a vise with the cylinder head (4) directed
upwards.
3. Draw or embed a match mark between the
cyl in der head (4), cylinder (3), bonnet (2) and
body (1).
4. Loosen elongated cylinder bolting (16, 17) by
rotating each nut (17) CW (viewed from above)
until fully removed. Withdraw each of the four
elongated bolts (16). NOTE: Sizes 3" and 4"
(DN80 and 100) have the body’s (1) bonnet
fl ange drilled and tapped so that no bottom
nut (17) is required.
5. While holding the cylinder (3) by hand, use
a wooden block to lightly rap the underneath
side of the cylinder head (4) to release the
head-to-cylinder joint. Once loosened, re move
the cylinder head (4).
6. Place locking pliers on stem nut (15). Keep
the pliers within the cylinder’s (3) interior away
from the cylinder (3) wall.
7. While placing downward force on the locking
pliers of the previous article, grasp the cyl in der
(3) by hand and simultaneously lift up wards
and wiggle sideways at the top until the joints
at the lower end of the cylinder (3), bonnet (2)
and body (1) loosen. If necessary, use a fl at,
sharp-edged tool to get under the bonnet (2)
at the joint between the bonnet (2) and the
body (1) while gently pushing the cylinder’s
(8) upper edge sideways back-and-forth; do
WARNING
Follow procedures given herein in handling main valve
topworks! Failure to heed may result in internals sliding
out of cylinder and falling down wards to im pact on foot!