Emerson EZH and EZHSO Series Pressure Reducing Regulators Bedienerhandbuch PDF herunterladen (Seite 21)

EZH and EZHSO Series

PRX Series Maintenance

CAUTION

Always remove spring (key 7) tension

before performing maintenance on this

unit. To remove spring tension, loosen

locknut (key 2) and back out adjusting

screw (key 1) until compression is

removed from the spring.

Lower Diaphragm Maintenance

1. Disconnect pilot and remove it from the line.

2. Remove machine screws (key 10) from lower

cover (key 21) and the separate lower cover from

the body (key 16).

3. Use a wrench to hold the stem (key 23) and break

loose the stem nut (key 20). Remove the stem nut

and washer (key 11).

4. Remove the upper diaphragm plate (key 13),

diaphragm (key 14), pad holder (key 22) and

O-ring (key 18). Inspect parts for damage or wear,

replace if necessary.

5. Remove orice (key 19) and O-ring (key 17).

Inspect the parts for damage or wear and replace

if necessary. Lightly lubricate the O-ring and place

in the body (key 16). Install the orice.

6. Set the pad holder (key 22) in the body (key 16).

7. Lightly lubricate the rims of the diaphragm (key 14)

and place it on top of the pad holder (key 22).

Set the upper diaphragm plate (key 13) on the

diaphragm (key 14).

8. Lightly lubricate the O-ring (key 18) and place it in

the lower cover (key 21).

9. Place the washer (key 11) and stem nut (key 20)

on the stem (key 23) and tighten. If also

performing Upper Case Maintenance, skip to

step 2 of the Upper Case Maintenance section.

10. Insert machine screws (key 10) in the lower

cover (key 21) and tighten uniformly to ensure

proper seal.

Upper Diaphragm Maintenance

1. Disconnect pilot and remove it from the line.

2. Loosen locknut (key 2) and back out adjusting

screw (key 1) until compression is removed from

the spring. Remove cap (key 3).

3. Lift the upper spring seat (key 6), spring (key 7)

and O-ring (key 4) out of the upper cover (key 8).

Inspect O-ring and replace if necessary.

4. Remove the machine screws (key 10) and the

washers (key 11), separate the upper cover

(key 8) from the body (key 16) and lift the lower

spring seat (key 9) away from upper diaphragm

nut (key 26). Use a wrench to hold stem (key 23)

securely while removing the upper diaphragm nut.

5. Remove remaining loose components: washer

(key 11), upper diaphragm plate (key 13),

diaphragm (key 14), lower diaphragm plate

(key 15) and O-rings (keys 18 and 25). Inspect

diaphragm and O-rings for damage or wear and

replace if necessary.

6. Lightly lubricate the O-ring (key 25). Place O-ring

over the stem (key 23) and press it down into the

body (key 16).

7. Set the lower diaphragm plate (key 15) into the

body (key 16).

8. Lightly lubricate the rims of the diaphragm (key 14)

and place it in the body (key 16) on top of the

lower diaphragm plate (key 15).

9. Set the upper diaphragm plate (key 13) on top of

the diaphragm (key 14).

10. Place washer (key 11) and stem nut (key 26) on

the stem (key 23) and tighten using a wrench to

hold the stem.

11. Place the lower spring seat (key 9) on the upper

diaphragm nut (key 26) and mount the upper

cover (key 8) on top of the body (key 24) and the

diaphragm (key 14).

12. Place and uniformly tighten the machine

screws (key 10) to hold the body (key 24) and

upper cover (key 8) together. Position the

diaphragm convolution facing down and make

sure that the diaphragm is not deformed and is

properly installed.

13. Install spring (key 7) and upper spring seat (key 6)

on top of the lower spring seat (key 9) inside the

upper cover (key 8). Install Cap (key 3).

14. Screw in adjusting screw (key 1) at desired

spring compression and use the lock nut (key 2)

to lock the adjusting screws position. Refer to

Pilot Adjustment section (page 11) to adjust

pilot settings.

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