Cashco PGR-1 Manuel d'utilisateur télécharger pdf (Page 5)

IOM-PGR-1

5

3. QC Requirements:

a. Valve plug (5);

1. 16 rms ﬁ nish on its seating surface

for tight shutoff.

2. No major defects on bottom guide

spin dle.

b. Cage (4);

1. 16 rms ﬁ nish on cylinder bore. No

“ledges” formed due to wear from

moving dynamic side seal (27) or

wiper seal (16).

c. Lower guide bushing (24) (non-re place-

able):

1. 16 rms ﬁ nish on bore.

2. Max 0.015 inch (0.38 mm) clearance

be tween valve plug (20) spindle and

lower guide bushing (24).

d. Internal sensing drilled plug (32);

1. Ensure that bore is minimum 0.125

inch (3.20 mm). Drill out as required.

4. Staging Material for Reassembly.

a. Inspect and clean parts, as necessary,

from the spare parts kit. (See Article VII

A.4. comments concerning special clean-

ing.

b. Lay out all the regulator parts and check

against the bill of material.

E. Reassembly of the ITA:

1. Installation of dynamic side seal (15).

a. Type OR:

1. Stretch o-ring seal (15) over lower

cir cum fer ence of guide bear ing (9),

tak ing care not to “cut” o-ring seal.

Using thumbs, work the o-ring seal

up and into the groove of the guide

bearing. NOTE: A very slight amount

of ﬂ uid and elas tomer compatible

lu bri cant is rec om mend ed as an

in stal la tion aid.

2. Position guide bearing (9) over top

of the upper end of cage (4) properly

oriented. Using thumbs, evenly press

guide bearing into the cage, ensur-

ing not to “cut” o-ring seal. Continue

pressing guide bearing into cage until

in ap prox i mate ﬁ nal position.

b. Type UC:

1. Stretch u-cup seal (15.1) over lower

circumference of guide bear ing (9),

taking care not to “cut” u-cup seal on

the protruding shelf that is part of the

guide bear ing's groove. Ensure that

the u-cup seal is oriented with the

center-open-downwards as shown

in image below, as the u-cup seal

depends upon the P1-Inlet Pres sure

to pressure activate the seal for proper

sealing action.

2. Position guide bearing (9) over top

of the upper end of cage (4) prop-

erly oriented, until the cup seal edge

touches the upper lip of the cage

(4). While gently applying force to

press the guide bearing (9) into the

cage, simultaneously use ﬁ ngers to

lightly press the edges of the u-cup

seal inwards into the groove of the

guide bearing until the u-cup seal

(15.1) “slips into” the cage (19). DO

NOT USE TOOLS, LUBRICANT, OR

HEAVY FORCE TO ENGAGE THE

U-CUP SEAL INTO THE CAGE .

Type OR — O-Ring

Dynamic Seal

Type UC — U-Cup

Dynamic Seal

1 2 3 4 5 6 7 8 9 10 ... 15 16

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