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CONTROL VALVES 762, 763, 765, 766 AND 767
Torque specification for socket-head screws
(continued)
Table 9-2:
Nominal pipe size
Daniel Class
Max Torque (ft-lb)
10" - 12"
600
17
Check valve shoulder screws
Table 9-3:
Valve size
Screw size
Max torque (in-lb)
2-4
4-40 UNC
5.2
6-16
8-32 UNC
19.8
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
Table 9-2
.
9.4.2
Cylinder reassembly (2" - 12" valves with socket head
screws in circular pattern on cylinder head) B style
NOTICE
Lightly coat the O-rings with a high grade lubricant to ensure proper seal and assist in the
reassembly procedure. All O-rings should be inspected for nicks, cuts, distortion or other signs
of wear and be replaced as required.
Procedure
1.
Install check valve assembly, if removed.
2.
Return the O-rings to the cylinder head.
3.
Reinstall the O-ring (seat ring) and sealing ring (clockwise). Tighten locking set
screw (8).
4.
Reinstall the piston O-rings or Spring energized seals.
5.
Insert the piston in the cylinder followed by the spring.
6.
Assemble the cylinder and cylinder head, compressing the spring.
CAUTION!
CYLINDER RELEASE HAZARD
The cylinder assembly is now spring loaded and should be handled with extreme care.
Failure to comply may cause serious injury or damage to the equipment.
Planned maintenance
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Daniel Models 762, 763, 765, 766 and 767 Control Valves