Repair And Inspection - Emerson YARWAY 9100 ARC Series Installation, Operation And Maintenance Instructions

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YARWAY 9100 SERIES ARC

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

CAUTION

The back pressure regulator has an integral

spring and if the draw bolt is removed, it should

be done carefully. See separate instructions for

external back pressure regulator.

DISASSEMBLY

2" to 8" [50 to 200 mm] valve sizes

1. For disassembly and inspection remove the

valve from the line. Match-mark the body

and bonnet to facilitate reassembly.

2. Remove the nuts attaching the valve bonnet

to the body.

3. Carefully lift straight up on the bonnet to

clear engagement of the disc stem.

4. The spring and disc assembly are now

exposed for easy removal.

5. Normally there is no need to remove

the bypass bushing. Should the bushing

be damaged, it may be removed by

straightening the lock washer tab. Remove

nut and lock washer. If necessary lightly tap

the bushing with a hammer and soft metal

rod. Be careful not to damage the threads

and bushing bore.

6. If the valve is fitted with an integral back

pressure regulator and the unit needs to

be replaced, carefully drill out the stake

mark in the plunger guide with a small drill.

Install draw bolt and washer (see Table 1

for sizes) and tighten until "snug." Torque

= 5 to 10 ft./lb. [6.8 - 13.6 N•m]. Loosen the

remaining ring (clockwise) approximately

one turn and remove the spiral ring.

Partially remove the draw bolt. Pry under

the head of the draw bolt to remove the

regulator capsule.

7. If the valve is fitted with a flow conditioner

(31), it can be removed by pencil grinding the

tack welds and lifting the worn part from the

body (1).

1" to 1½" [25 to 40 mm] valve sizes

1. Follow Disassembly, step 1 for 2" to 8"

valves.

2. Remove the nuts attaching the valve bonnet

to the body, remove the bonnet.

3. Remove the bypass tube as follows: Drill

out the stake mark with a small drill. Use a

spanner wrench in the tube slots and turn

counterclockwise to remove. A 1" x 2" x ⅛"

[25 x 50 x 3 mm] thick steel plate and an

adjustable wrench may be used if a suitable

spanner wrench is not available.

4. Remove the disc-bypass bushing assembly

(Items 33, 34, 36, 37, 38, 39, 40, and 42) by

applying force to the bottom of the disc as

follows: Push on the bottom of the disc with

a 1" [25 mm] diameter bar until the spring

is fully compressed. Tap on the bar with a

mallet if additional force is required.

VALVE

5. Lay the disc-bypass bushing assembly on a

flat surface with the bottom of the disc up.

Push down on the spring retainer (36) until

the spiral ring (38) is exposed. Remove the

spiral ring by inserting a screwdriver into

the ring removal notch and uncoiling the

ring over the shaft end. The assembly can

now be taken apart.

6. The main check flow element (29) does not

normally require maintenance. Should there

be a need to remove the flow element, lift

flow element evenly to prevent jamming

within the body. Light tapping around the

I.D. of the Flow element may be necessary

to free the part.