cashco 6987 설치 운영 및 유지보수 - 페이지 4

{카테고리_이름} cashco 6987에 대한 설치 운영 및 유지보수을 온라인으로 검색하거나 PDF를 다운로드하세요. cashco 6987 9 페이지. Back pressure / relief regulator

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9. If available, collapse the piston spring (20)

using the special tool from Figure 1. If no

special tool is available, proceed to Step 10.

10. Place new diaphragm gasket (11) and

diaphragms (10) onto body (1).

11. Place multi-purpose, high temperature grease

into depression of the pressure plate (8) and

spring buttons (4) where the ball bearing (9)

and ad just ing screw (3) bears. In the cen ter

of the di a phragms (10), place the pres sure

plate (8), ball bearing (9), spring but tons (4),

and range spring (6). Ensure spring buttons

(4) are laying flat.

12. Aligning the matchmarks, place spring

cham ber (2) over the above stacked parts.

Install flange bolts (13). Me chan i cal ly tight en

flange bolts (13) in a cross pattern that allows

the spring cham ber (2) to be pulled down

even ly. Tighten all flange bolts (13) to the

following torque value: All Sizes: 45–50 Ft-

lbs (61–68 Nm).

NOTE:

Never replace bolting (13) with

just any bolting if lost. Bolt heads and nuts

are marked with specification identification

mark ings. Use only prop er grades as

re place ments.

13. Reinstall adjusting screw (3) with locknut (5).

14. Spray liquid leak detector to test around flange

bolts (13) and body (1) / spring cham ber (2)

connection for leak age. En sure that an inlet

pressure is main tained dur ing this leak test

of at least mid-range spring level; i.e. 50-100

psig (3.4 - 6.9 Barg) range spring, 75 psig

(5.2 Barg) test pressure minimum.

C. Renewal Unit Maintenance:

1. Refer to previous pro ce dures, Sec tion VI.B.

steps 1–7 to remove all parts above the

re new al unit (17).

2. Remove the piston spring but ton (17.3),

piston (17.1) with piston o-ring (19), and the

piston spring (20).

3. Remove the cylinder (17.2) by turning CCW.

4. Inspect seating surfaces of the piston (17.1)

and cylinder (17.2). If necessary, relap the

seat ing sur face or replace renewal unit (17).

5. Clean all parts to be reused according to

own er's procedures. NOTE: On reg u la tors

orig i nal ly sup plied as "spe cial cleaned",

Option-55, main te nance must in clude a

level of clean li ness equal to Cash co's

clean ing stan dard #S-1134. On reg u la tors

orig i nal ly sup plied as "spe cial cleaned",

Op tion-56, main te nance must in clude a level

of cleanliness equal to Cash co's clean ing

stan dard #S-1542. Con tact fac to ry for details.

6. Lubricate the cylinder (17.2) threads lightly

with thread sealant.

(17.2) into the body (1) and impact until

approximately 100 Ft-lbs (136 Nm) torque

value is reached. This is a metal to metal seal.

7. Install the piston spring (20) into the body

(1) cavity. Place the piston o-ring (19) into

groove of piston (17.1) and install along with

the piston spring button (17.3) into the cylinder

(17.2).

8. Refer to previous procedures, Section VI.B.

steps 8–13 to replace all other parts.

9. Bench test unit for suitable operation. NOTE:

Reg u la tors are not tight shutoff devices. Even

if pressure falls below set point, a regulator

may or may not develop bubble tight shutoff.

10. Spray liquid leak detector to test around flange