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B. Main Regulator Disassembly:

SYSTEM UNDER PRESSURE. Prior to per form ing any

maintenance, isolate the reg u la tor from the system and

relieve all pressure. Failure to do so could result in

personal injury.

1. Shut down system in accordance Section VI.

2. Disconnect the external sensing line, if in-

stalled. Disconnect tubing at inlet connection

of the main regulator body and from the tee

where low temperature probe is connected.

3. Though it is possible to disassemble the valve

unit while installed in a pipeline, it is rec om-

mend ed that maintenance be done in a shop

when possible. The instructions hereafter will

assume disassembly in a shop. Remove valve

from pipeline.

4. Place the regulator body in a vise with the

cover dome (25) upwards.

5. Loosen the diaphragm flange bolts (11) and

nuts (12) uniformly.

6. Place matchmarks on body (23) and cover

dome (25) flanges. Remove cover dome (25).

Figure 1: Dynamic Side Seals

Type CW — TFE Cap

Dynamic Seal + Wiper

WARNING

Type UC — U-Cup

Dynamic Seal

Tubing Connection

Filter

Low Temp Probe

Figure 2

7. Hold the milled "flats" on top of the valve

plug (20) stationary, rotate the di a phragm

lock nut (7) CCW to remove.

8. Remove upper diaphragm plate (8).

9. Remove diaphragm (9) and o-ring upper stem

seal (14.1). Examine diaphragm to determine

whether failed; determine if op er at ing condi-

tions are ex ceed ing pressure, pressure drop

or temperature limits.

Unloader

Oriﬁ ce

Filter

Gauge

Bug Vent

IOM-PTR-1