DANIEL 700 User Manual page 52

MODEL 700 CONTROL VALVE
User manual
P/N 3-9008-553
9.4.4 Cylinder reassembly (NPS 16 valve only)
User manual
52
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4. For ease of installation, secure cylinder assembly to cylinder heads using hand
pressure or arbor press.
WARNING
DISASSEMBLY HAZARD
When performing any disassembly procedure caution is required as the cylinder
head is bolted to a spring loaded cylinder assembly. Service should only be
performed by trained and qualified service personnel.
Failure to follow these instructions could result in death, serious injury or damage
to the equipment.
5. Lower the "new" cylinder assembly and cylinder head into the valve body. Align the
bolt holes in the cylinder head with the studs in the main valve body.
6. Fasten the cylinder head into position using retaining nuts. Tighten nuts,
alternating to opposite sides, to assure a uniform seat.
7. Return all tubing and/or valve accessories to their original position.
Procedure
1. 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.
2. Carefully reinstall piston into cylinder assembly.
3. Install outside cylinder O-ring.
4. Using ¾-in - 10 bolts and suitable lifting device, reinstall cylinder and piston
assembly back into valve body.
5. Remove ¾-in - 10 bolts from cylinder. Reinstall spring into valve.
6. Reverse jack-out nut procedure to alternately tighten.
7. Reinstall cylinder head and reservoir to valve body.
8. Reinstall and tighten nuts.
9. Remove (2) long rods. Reinstall studs.
10. Re-establish nitrogen line connections to the valve.
11. Open all product flow to the valve.
12. Return the valve to service.
Planned maintenance
November 2020
61