|
| |
TM 07661B-14/1
APPENDIX A
A 3-11. ADJUSTMENTS.
a.
Nitrogen Pressure Regulators. The nitrogen pressure regulators will normally be removed and returned to the
field maintenance facility for adjustments. When a replacement regulator is not available, field adjustments can be made
to preclude removing the fire extinguisher from service.
WARNING
Be sure system is depressurized before installing gage.
(1)
Ensure that the fault is in the suspected regulator by installing a 0-300 psi pressure gage in place of the
pipe plug (1, figure 3-4) in the regulator assembly.
(2)
Close the charge valve.
(3)
Open N2 cylinder valve in affected system.
(4)
Remove locking wire on adjusting bolt.
(5)
While observing the low pressure gage, use a wrench to loosen locking nut (2) and turn adjusting bolt (3)
on pressure regulator to obtain reading between 220 and 240 psi. Turn adjusting bolt clockwise to increase pressure,
counterclockwise to decrease pressure. Secure adjusting bolt with lockwire.
(6)
Depressurize system, remove low pressure gage and reinstall pipe plug (1) in regulator. Restore system
to standby status, paragraph 2-12a.
b.
Nitrogen Cylinder Valve. Normal wear of the nitrogen cylinder valve seat may cause the valve to leak
occasionally. The valve is designed for easy adjustment to stop such leaks. See figure 3-5.
Figure A 3-5. Nitrogen Cylinder Valve Adjustment
A 3-17
|
