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Type 1290
11. Install the indicator fitting (key 5) with attached parts
into the body flange (key 2). Back the hex nut (key 8)
off until the spring (key 9) completely closes the valve
plug (key 16) against the port (key 12) and upper
seals (key 15), as indicated by stem threads showing
between this nut and the fitting. Hold the indicator
scale (key 18) against the fitting with the scale base
resting against the shoulder of the fitting, and turn
the flange nut (key 22) until its flange is aligned
with the bottom scale marking. Then lock both nuts
against each other, and install the indicator scale and
protector (key 19).
Type T208P or T208PL Pilot
!
To avoid personal injury resulting from
sudden release of pressure, isolate the
pilot from all pressure and cautiously
release trapped pressure from the pilot,
supply and main regulators before
attempting disassembly.
Body Area
This procedure is for gaining access to the disk
assembly, orifice and body O-ring. All pressure must
be released from the regulator, before the following
steps can be performed. Key numbers are referenced
in Figures 8 and 9.
1. To inspect and replace the disk assembly (key 13)
or orifice (key 5), remove the back body cap
(key 43).
2. Remove the disk assembly (key 13) from the disk
spacer (key 44) if it is necessary to replace the
disk assembly.
3. To inspect and replace the orifice (key 5) or throat
seal O-ring (key 31), remove the cap screws (key 2)
and separate the diaphragm casing (key 4) from the
body (key 1).
4. Remove and inspect the body seal O-ring (key 11)
and back-up ring (key 49). Replace if necessary.
5. Inspect and replace the orifice (key 5) if necessary.
Lubricate the threads of the replacement orifice
with a good grade of light grease. Install with
29 to 37 ft-lbs / 39 to 50 N•m of torque.
6. Inspect and replace the throat seal O-ring (key 31)
and the machine screw (key 34).
8
WARNING
P1508
Figure 5. Seat Ring/Cage Removal or Installation
Using Body as Holding Fixture
7. Install the back-up ring (key 49) in the body (key 1).
Next, install the body seal O-ring (key 11) into the
body. See the expanded view of the body area in
Figure 8 or 9.
In the following step, be sure to install
the spring case barrel pointed down as
shown in Figure 1.
8. Replace the diaphragm casing (key 4) on the body
(key 1) and secure with the cap screws (key 2).
9. Secure the disk assembly (key 13) to the disk
spacer (key 44). Place the back disk spring (key 41)
and back body seal O-ring (key 42) on the back
body cap (key 43).
10. Use a good quality thread sealer when replacing the
body cap assembly.
Diaphragm and Spring Case Area
For a Type T208P Pilot
This procedure is for gaining access to the control
spring, diaphragm and lever assembly stem. All
pressure must be released from the diaphragm case
assembly before the following steps can be performed.
Key numbers are referenced in Figure 8.
To Change the Control Spring:
1. Remove the closing cap (key 22), and turn the
adjusting screw (key 35) counterclockwise until all
compression is removed from the spring (key 6).
Note
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