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Type 1290
6. Install the lever assembly (key 16) into the lever
stem and secure the lever assembly with the
machine screws (key 17).
7. Install the diaphragm head gasket (key 45), lower
diaphragm head (key 7), diaphragm (key 10) and
upper diaphragm head (key 7) on the pusher post
(key 8). Coat the top surface of the pusher post with
a good grade of adhesive gasket sealer and
secure with the diaphragm hex nut (key 21) with
80 to 110 in-lbs / 9 to 12 N•m of torque.
8. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 16).
9. Install the spring case assembly (key 3) and control
spring (key 6) on the diaphragm casing (key 4) so
the vent assembly (key 26) is correctly oriented, and
secure them with the cap screws (key 24) and hex
nuts (key 23, not shown) fingertight only.
10. Turn the adjusting nut (key 20) clockwise until there
is enough control spring (key 6) force to provide
proper slack to the diaphragm (key 10). Using a
crisscross pattern, finish tightening the cap screws
(key 24) and hex nuts (key 23, not shown) to
16 to 20 ft-lbs / 22 to 27 N•m of torque. Then finish
turning the adjusting nut to the desired outlet
pressure setting.
11. Install a replacement closing cap gasket (key 25) if
necessary, and then install the closing cap (key 22).
12. Reinstall the Type T208PL on the Type 1290 with
the Type T208PL spring case barrel pointed up.
Type MR95H Supply Pressure Regulator
This section includes instructions for disassembly
and replacement of parts for the Type MR95 supply
regulator. Key numbers are referenced in Figure 10.
!
Before disassembling the regulator,
isolate it from the pressure system and
release all pressure from the regulator.
1. Unscrew the valve plug guide (key 5) from the body
(key 1). The inner valve spring (key 26) and the
valve plug (key 4) will normally come out of the body
along with the valve plug guide.
2. Inspect the seating surface of the valve plug (key 4),
being sure that the composition surface of the valve
plug is not damaged. Replace if damaged.
3. Inspect the seating edge of the orifice (key 3). If
damage is noted, unscrew the orifice from the
body and replace it with a new part. If no further
10
WARNING
maintenance is required, reassemble the regulator
in the reverse of the above steps. When installing
the valve plug guide (key 5) coat the threads and
sealing surface with sealant to ensure an adequate
metal-to-metal seal.
4. If diaphragm (key 12) damage is suspected, or to
inspect the diaphragm or other internal parts, loosen
the jam nut (key 17) and turn the adjusting screw
(key 15) to remove all spring compression.
5. Remove the diaphragm case cap screws (key 16)
and lift off the spring case (key 2). Remove the
upper spring seat (key 9) and regulator spring
(key 11). Remove the lower spring seat (key 8).
6. Remove the diaphragm (key 12) and examine for
damage. Replace if damage is noted.
7. With diaphragm (key 12) removed, check to be sure
the pressure registration hole is completely open and
free from all obstructions.
8. Reassemble in the reverse of the above procedures.
Lubricate the upper spring seat (key 9) and the
exposed threads of the adjusting screw (key 15).
Before tightening cap screw (key 16) be sure to
install the adjusting screw, if completely removed,
and turn it down so that diaphragm slack is obtained.
This allows proper positioning of the diaphragm
(key 12) to permit full travel of the valve plug
(key 4). Complete reassembly procedures and turn
the adjusting screw to produce the desired outlet
pressure values shown in the Type MR95H set
pressure specifications. Tighten the jam nut (key 17)
to maintain the desired setting. After reassembly,
remove the gauge and replace the pipe plug.
Type 1098 Actuator and Mounting Parts
Perform this procedure if changing, inspecting,
cleaning or replacing the actuator and/or the pilot
mounting parts. Key numbers are referenced in
Figures 7 and 11.
1. The actuator and pilot may be removed and
replaced as a unit by disconnecting the Type 1098
loading pressure line.
2. Access to all internal parts except the stem O-rings,
bearings and wiper ring (keys 6, 56 and 57,
respectively, Figure 7) may be gained without
removing the bonnet (key 3) or upper diaphragm
case (key 2) from the main valve. Disconnect the
pipe nipple (key 39, Figure 11) from the lower
diaphragm case (key 1, Figure 7).
3. Remove the cap screws (key 10), nuts (key 11),
lower diaphragm case (key 1), diaphragm (key 7),
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