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6. Relax the range spring (15) by rotating the

ad just ing screw (19) CCW (viewed from above

ad just ing screw until fully loose. Keep track

of the num ber of rev o lu tions in the box below:

No. of Revolutions adjusting screw ro tat ed:

__________________.

7. Connect temporary air supply with in-line

ad just able airset regulator to P

Slow ly pres sur ize the pilot valve (PV) while

ob serv ing the jar with water. Bring pres sure

to 50 psig (3.4 Barg). Wait a minimum of five

min utes. Observe for leak age of bubbles in the

water jar. If the number of bubbles is greater

than one (1) per minute, the leakage is at the

point where trim re place ment is rec om mend ed.

(Rec om mend pres sure in teg ri ty test per Sub-

Section D. here in.)

8. Remove leak test apparatus. Re in stall brass

fit tings (20) using suitable thread sealant.

Reinstall all tubing (21).

C. Seat Leakage – Main Valve (MV):

Seat leakage rate for main valve cylinder

(3.1) and piston (3.2) should be equiv a lent

to ANSI/FCI 70-2, Class IV (approaches

0.1% of rated valve capacity).

D. Pressure Integrity Leak Test:

1. Test pilot valve (PV) and main valve (MV)

assembled together with all interconnecting

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

2. Insert tapped pipe plugs with hose fittings to

both inlet and outlet body (1) connections.

3. Install temporary hoses with tight shutoff

in stru ment needle valves at outlet connection

of main valve (MV) and of the pilot valve (PV).

4. Connect temporary air supply with in-line

adjustable airset regulator to inlet connection

of main valve (MV).

VIII. TROUBLE SHOOTING GUIDE

1. Erratic or Noisy Operation.

Possible Causes

Wet steam or condensate at the inlet.

Clogged pilot valve screen.

Regulator oversized for flow conditions.

Insufficiently sloped line.

IOM-POSR-1

outlet of pilot.

SECTION VIII

Install a steam trap on the inlet side of the regulator.

Clean or replace. Blowdown inlet drip leg. Install upstream strainer, if

severe.

Install correct size.

Move tap from top of pipe to side; or, increase sensing tube to 3/8" OD.

5. Close needle valve at outlet connection of main

valve (MV). Crack open the needle valve at

the pilot valve (PV) outlet.

6. Rotate adjusting screw (19) of pilot valve (PV)

CW (viewed from above adjusting screw) until

a point of high resistance occurs; this should

correspond to the diaphragm (12) pushing

against the body's (1) down trav el stops.

Record the number of rev o lu tions the ad just ing

screw was rotated in the box below:

No. of revolutions the adjusting screw

was ro tat ed ______________.

7. Slowly pressurize the inlet of the main valve

(MV) and pilot valve (PV) to 100 psig (6.9

Barg).

NOTE: If the pilot valve (PV) has any other

range spring (15) above 5–15 psig (.34–1.03

Barg), the test pressure can be raised to 200

psig (13.8 Barg).

8. Using a solution of leak detection fluid and

water, apply a liberal amount of the solution

to cover each external joint, in clud ing the

thread ed fittings (20), tub ing (21) and the

interconnecting pipe nipple (19) threaded

con nec tions. Wait a minimum of five minutes to

allow sufficient time for a leak to form bubbles.

Repeat this procedure with a second five

minute wait.

9. Identify and mark any observed leakage.

Dis as sem ble down to the point of leakage

and determine the cause of the leak. Repair

and reassemble per instructions in Section

VI. Retest per Section VII.

10. Shut off pressure to inlet con nec tion of

main valve (MV) and re move all leak testing

equip ment. Reset the adjusting screw (19)

back to its normal setpoint by rotating the

screw (19) CCW (viewed from above) the

same num ber of revolutions re cord ed in Ar ti cle

6. pre vi ous, this sub-section.

Remedies