cashco 521 설치, 운영 및 유지보수 매뉴얼 - 페이지 6

{카테고리_이름} cashco 521에 대한 설치, 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. cashco 521 20 페이지. Total tfe, globe-pattern control valve body iom

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7. For units with Reverse Action (ATO-FC)

ac tu a tors pressurize to a level sufficient to

initiate travel to approximately mid-stroke

to hold the plug (3) away from the body (1)

seat.

8. Apply leak detection fluid to all the potential

leak paths:

a. Packing gland nut (5). (Tighten as

nec es sary.)

b. Body (1)-to-bonnet (2) flange tape hole.

c. Body (1) and bonnet (2) bolting (13, 14,

1.3, 1.4, 1.5).

d. End connection blind flange tape hole.

e. Test pressure piping con nec tions.

9. If leakage occurs at:

a. a. above, there is a packing (6) or a

pack ing (6) /stem sub-assembly (9)

failure.

b. b. above, there is a bonnet gasket (11)

failure.

c. c. above, there is a bonnet gasket (11),

or TFE core (1.2) failure.

d. d. above, there is a bellows sub-as sem bly

(8) failure.

10. Following this test procedure may help

to solve main te nance problems when

combined with visual ex am i na tion of

disassembled body assembly (BA).

C. Separation of Body/Actuator:

1. Reference the Actuator IOM-C27-C53 for

item number call outs and drawings for

actuator.

2. Secure the body in a vise with the actuator

assembly (AA) oriented vertically. Place

matchmarks between the body (1) bon net

flange, the bonnet (2) flange, and the yoke

(3) to assist in final ori en ta tion when the

body is dis as sem bled and/or the ac tu a tor

removed. If actuator has handwheel - see

Actuator IOM for removal instructions.

3. Secure and rig the actuator assembly (AA)

for a ver ti cal lift using an overhead hoist.

Remove slack from rigging.

4. This procedure assumes that the body

as sem bly (BA) has been fully assembled

through the bonnet (2), including the packing

gland nut (5) and packing (6).

5. Remove vented pipe plug (12) from body.

6. Loosen stem nut (20) by rotating nut CW

(viewed from above) to base of threads.

7. Loosen packing (6) by turning packing gland

nut (5) CCW 2-3 revolutions.

8. Rotate yoke nut (15) CCW to fully loosen

nut.

9A. For ATO-FC Reverse Action Actuators:

a. Connect a temporary air source

to the actuator and pressurize the

actuator to upper limit of the bench

range specified on the valve name

plate. (Pressure will lift the plug head

(3) away from the body's (1) integral

seat until the plug (3) is 100% open.)

b. Place a wrench on the hex surface

of the swivel lower knuckle (44) and

rotate knuckle CCW (viewed from

above ac tu a tor) until lower knuckle dis-

engages from stem (9). Keep track of the

number of full rev o lu tions to dis-engage

and record here. _______________

c. Maintain lift support from above the

Figure 6: Swivel-Type Connector

actuator assembly (AA). Dis-engage

(slide) the swivel lower knuckle (44) out

of the upper knuckle (43) slot.

9B. For ATC-FO Direct Action Actuators:

a. Place a wrench on the hex surface