Cylinder Reassembly (Nps 16 Valve Only) - Emerson Daniel 762 User Manual

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9.4.3

Cylinder reassembly (NPS 16 valve only)

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User manual
WARNING!
OVER-TORQUING SCREWS HAZARD
The only function of the socket-head screws that secure the cylinder head to the cylinder
is to provide a mechanical joint between components during assembly or disassembly.
Do not Over torque the screws during assembly, see
WARNING!
ISOLATING UPPER CHAMBER HAZARD
The only function of the socket-head screws that secure the cylinder head to the cylinder
is to provide a mechanical joint between components during assembly or disassembly.
Do not Isolate the upper chamber (Nitrogen Reservoir) during Shell or Hydro Testing,
pressure must be applied to the inlet and upper chamber at the same time.
Return the jacket screws (6) to the original position.
Install O-rings on the outside of the cylinder.
Reinsert the cylinder assembly into the valve body.
Return the cylinder head assembly to its original position and lock into place using
the original studs and bolts. (It may be necessary to tap the cylinder assembly home
in the valve body.)
Fill the reservoir with the correct amount of oil. The level will be between the two
sight glasses.
Re-establish nitrogen line connections to the valve.
Open nitrogen lines to the tank and establish the required pressure.
Reinstall seat O-ring and seal ring and tighten (24) bolts.
Important
Lightly coat the O-rings with a high grade lubricant to ensure proper seal. Inspect all O-rings
for nicks, cuts, distortion or other signs of wear and replace as required.
Carefully reinstall piston into cylinder assembly.
Install outside cylinder O-ring.
Using ¾" - 10 bolts and suitable lifting device, reinstall cylinder and piston assembly
back into valve body.
Remove ¾" - 10 bolts from cylinder. Reinstall spring into valve.
Reverse jack-out nut procedure to alternately tighten.
Reinstall cylinder head and reservoir to valve body.
Reinstall and tighten nuts.
Remove (2) long rods. Reinstall studs.
Re-establish nitrogen line connections to the valve.
Planned maintenance
Table 9-2.
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