Cashco POSR-2 Manuel d'utilisateur télécharger pdf (Page 8)

IOM-POSR-28

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!

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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Cashco POSR-2 Manuel d'utilisateur Page 8

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