Cashco POSR-2 Manuel d'utilisateur télécharger pdf (Page 6)

IOM-POSR-26

2. Loosen locknut (20) by rotating CCW (viewed

from above) ONLY two revolutions. Relax

range spring (15) by turning adjusting screw

(19) CCW (viewed from above) until removed

from spring chamber (2). Set ad just ing screw

(19) with locknut (20) aside.

3. Draw or embed a match mark between body

casting (1) and spring chamber casting (2)

along ﬂ anged area.

4. Remove all diaphragm ﬂ ange nuts (18) and

bolts (17).

5. Remove spring chamber (2) by lifting up wards.

Re move range spring (15) and spring button

(16).

6. Remove pressure plate(14). Inspect to

en sure that the pressure plate (14) has not

been deformed by overpressure by placing a

thin, straight bar or ruler across the side that

touch es the diaphragm (12). If the pressure

plate (14) does not touch the bar at its center

(i.e. a depression in center), the pressure plate

(14) is deformed and must be replaced.

7. NOTE: Pilot valves (PV) supplied with a 5–15

psig (0.34–1.03 Barg) range spring (15) have

only one di a phragm (12) supplied; all other

spring ranges use two diaphragms (12).

Using a putty knife or similar tool, remove

diaphragm(s) (12) and diaphragm gasket

(13). Inspect diaphragm(s) (12) for cracks or

de for ma tion. Radial creases and cracks indi-

cate over pressure. Cracks circumferentially

in di cate high cycles, and may be due to normal

cycling, or pulsing or chattering if premature.

Discard both diaphragm(s) (12) and gasket

(13).

7. Remove pilot valve (PV) from vise and set

aside.

C. Pilot Valve (PV):

1. Securely install the pilot valve body (1) in

a vise with the spring chamber (2) directed

upwards.

8. Using a 7/8" deep well socket, remove bel lows

(11) by rotating CCW (viewed from above).

Count and record the number of revolutions

required to remove the bellows (11) in the box

below:

Number of revolutions required to remove

bellows (11):________________.

Inspect the bellows (11) for a crack or joint

failure where leakage is occurring. Replace

bellows (11) if leaking.

9. Remove protruding stem extension (10).

10. Using a ﬂ at, sharp-edged tool, clean body (1)

ﬂ ange where diaphragm gasket (13) seals.

11. Using a wire gauge tool, clean the 0.068"

(1.73 mm) diameter bleed oriﬁ ce located in

the body cavity (smaller of two holes) of any

ﬁ lm or other buildup material that might be

restricting ﬂ ow.

NOTE: Any signiﬁ cant blockage of the bleed

or i ﬁ ce will downgrade a POSR-2’s per for-

mance. If a buildup is form ing, attempt to de-

termine the cause and remove the source.

12. Remove body (1) from vise and reorient with

body cap (9) on top; resecure body (1) in

vise.

13. Remove body cap (9) by rotating CCW (viewed

from above) with hex-end wrench. Hammer-

rapping the wrench may be necessary, as the

body cap (9) has a metal-to-metal shoulder

joint with the body (1). NOTE: Plug (4.2) and

plug spring (7) may come out with body cap

(9) removal.

14. Remove plug spring (7) and plug (4.2) from

body (1) recess.

15. Using needle nose pliers, carefully remove

the screen (6) from the body (1) recess.

16. Inspect body cap (9), screen (6), plug spring

(7), and plug (4.2) for buildup or ﬁ lming. If

parts are “sticking” together, then improper

condensate corrosion treatment is likely. If

scale or other debris is present, then an up-

stream strainer is recommended.

17. Using a 5/8" deepwell socket, rotate valve seat

(4.1) CCW (viewed from above) to re mov al.

WARNING

SPRING UNDER COMPRESSION. Prior to re mov ing body

ﬂ ange bolts, relieve spring com pres sion by backing out

the adjusting screw. Failure to do so may result in ﬂ ying

parts that could cause personal injury.

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Cashco POSR-2 Manuel d'utilisateur Page 6

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