cashco 521 Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 9
Jelajahi secara online atau unduh pdf Panduan Pemasangan, Pengoperasian & Pemeliharaan untuk Unit Kontrol cashco 521. cashco 521 20 halaman. Total tfe, globe-pattern control valve body iom
Halaman Cetak
1/2" (DN 15) & 1-1/2" (DN 40) Body Sizes
1" (DN 25) Body Size
2" (DN 50) Body Size
Figure 7: Belleville Spring Washer Orientation
7. Center the loose parts (10) (7) surrounding
the stem (9) as close as possible.
8. Position the bonnet (2) over the exposed
upper stem sub-assembly (9), ensuring
that the anti-rotation "stop" (square or flat
surface of the stem) is properly en gaged
into the bonnet (2) square recess.
9.
Place a temporary spacer device (screw driv er
blade, nuts, plain washers, etc.) equally
spaced on the body (1) flange to hold the
bonnet (2) up, as bonnet is lowered into
the body, maximizing the gap between the
bonnet flang es (1) (2).
10. Place anti-seize thread lubricant on bonnet
cap screws (14).
cap screws (14) with lockwashers (13)
ap prox i mate ly 1-1/2 revolutions.
11. Visually observing the gap between the
bon net (2) lower flange surface and the
body sub-assembly (1) bon net flange, apply
downward force tend ing to seat the plug
end (3). This will pull the bellows (8.1) into
proper position for the primary bon net seal.
12. When visually satisfied of concentricity
IOM-521
Engage all bonnet
and align ment of parts (10) (8) (11) (7),
re move temporary spacer while continuing
downward force on the stem (9) while
si mul ta neous ly holding the bonnet (2) from
drop ping down wards.
13. Lower bonnet (2) carefully downwards into
the recess of the body sub-assembly (1)
while con tin u al ly applying downward force
on the stem (9).
14. At this point, downward force on stem (9)
may be exchanged for down ward force on
the bon net (2). Hand-tighten all bonnet cap
screws (14); relax down ward force on bonnet
once cap screws have taken up all slack.
15. Using a torque wrench, tight en bonnet cap
screws (14) in alternating cross-pat tern in
1/4 rev o lu tion in cre ments to 40 ft-# (55 N-M).
Improper bonnet bolting torques may lead to
premature failure of the primary and secondary
bonnet seals.
16. Engage threaded, vented pipe plug (12) into
the 1/8" NPT tap on the bon net (2) if it was
removed. If a lubricating oil is compatible with
the fluid, a light coat ing will aid in pre vent ing
galling of the plug (12). En sure that the tip
of the notch on the threads is in the bonnet
(2) at least 1-1⁄2 revolutions. Do not over-
tighten to min i mize chanc es of galling.
Do not use thread sealing com pound that
might "fill in" the notch and negate the pur pose
of the notch.
17. The packing ring set (6) de sign is identical for
all unit body sizes. It consists of seven V-rings
(6.1) and one each male (6.2) and female
(6.3) adapter. (See Figure 8.) The purpose of
the packing rings (6) is to minimize moisture
ingress, and to serve as a sec ond ary stem
seal in the event of bellows sub-as sem bly
(8) failure.
Carefully install rings (6) as indicated in
Fig ure 8, one at a time, using a hollow tool
to press the rings (6) to their final position.
Take care in slipping the rings (6) over the
threaded end of the stem (9) so as to not
mar the ring's (6) internal surfaces. Do not
reverse ori en ta tion for vacuum service. Do
not "split" rings (6) for ease in replacement.
Do not reuse re moved packing rings (6).
CAUTION
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