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nuts (18) onto bolts (17) along un der neath

side of body (1) flange and finger-tighten.

40. Remove the two upside-down bolts (17) and

nuts (18) and rotate to position of other bolts

(17). Place nameplate tag (21) over one of

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 cham ber (2)

is not tightened down, and may be temporarily

"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) ad just ing

screw (19) opening. Place lu bri cant onto

the ad just ing screw (19) lower-end threads.

Engage adjusting 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) flange with the

body (1) flange, 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).

Never replace bolting (17, 18) with just any bolting if

lost. Bolt heads and nuts are marked with spec i fi ca tion

identification markings. Use only proper grades as

replacements.

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 sub-section.

45. Pressure leak test pilot valve (PV) assembly

when rejoined with the main valve (MV)

as sem bly including interconnecting nipple

(19), tubing (21), and tubing fittings (20).

IOM-POSR-1

WARNING

D. Main Valve (MV):

1. Securely install the body (1) in a vise with the

loading chamber (2) directed upwards.

2. Draw or embed a match mark between body

(1) casting and spring chamber (2) casting

along flanged area.

3. Remove all cap screws (14) and nuts (15).

4. Remove loading chamber (2), diaphragms

(12), diaphragm gaskets (13) and pusher

plate (11). Clean body (1) and diaphragm (12)

flange surface.

5. Rotate cap screws (10) CCW to remove, lift

shield plate (9) out of body (1) cavity.

6. Remove body (1) from vise, rotate body (1)

with body cap (4) directed upwards and re-

secure body (1) in vise.

7. Loosen and remove body cap (4) using a hex

head wrench with a lever length of at least 15"

inches. The wrench should be rapped with a

hammer to loosen.

8. Remove piston spring (6), piston (3.2) and

cylinder (3.1). Inspect parts for excessive

wear, especially at seat surfaces. Replace if

worn.

9. Remove the cylinder gasket (8) and clean

contacting surface in body (1).

10. Clean flat mating surfaces of body (1) to body

cap (4) shoulder.

11. Clean debris from within body (1) cavity and

all parts to be reused.

12. Reinstall a new cylinder gasket (8). Use

the cylinder (3.1) to firmly and evenly press

the gasket (8) into place. Gasket surfaces

maybe lightly coated with pipe sealant prior

to in stal la tion.

13. Ensure cylinder (3.1) is concentrical within the

body (1) opening. Slide the piston (3.2) into

the cylinder (3.1).

14. Place piston spring (6) into piston cavity.

15. Apply pipe thread sealant to body cap (4)

threads and screw into body (1). When body

cap (4) shoulder is resting fully down against

body (1), use a wrench with 15" lever handle

and a hammer to impact the body cap (4) tight