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5.7.2
5.8
SECONDARY RELIEF VALVE
5.8.1
5.8.2
5.9
VENT VALVE
5.9.1
5-12 Service and Repair
Installation
Before installing the relief valve, wrap the relief valve threads with Teflon tape,
starting two threads back from the end.
1. Install the primary relief valve by reversing the removal procedure (Section 5.7.1).
The secondary relief valve is a poppet-type, pressure-regulating valve that acts as a
safety backup in the event that the primary relief valve fails to limit system pressure to
an acceptable range. Under normal operating conditions, the secondary relief valve
remains closed. The secondary relief valve is not field serviceable. If it is not operating
properly, replace it.
Removal
Refer to Figure 6-6 to identify parts with bold number references.
1. Remove side cover B (Section 5.2.1, steps 1 and 2).
1
2. Use a
/
-in. open-end wrench to loosen the
2
secondary relief valve 1 and the secondary relief valve adaptor 2. Simultaneously,
hold the relief valve adapter stationary with another
removing the secondary relief valve.
Installation
Before installing the secondary relief valve assembly, wrap the relief valve
threads with Teflon tape, starting two threads back from the end.
1. Install the secondary relief valve by reversing the removal procedure (Section 5.8.1).
The vent valve is a lever-operated, poppet-type valve that you open to begin a
Companion 1000/T fill and close to terminate the fill. Service to the valve is limited to
replacing the valve lever and lever pin.
Removal
Refer to Figures 6-1 or 6-2 and 6-7 to identify parts with bold number references.
1. Remove the side covers by following the side cover removal procedure (Section
5.2.1).
2. Use a
9
/
-in. open-end wrench to disconnect the
16
vent extension tube 9 to the vent valve 10 (Figure 5-15).
Companion 1000/T Liquid Oxygen System Technical Manual
-in. tube nut 4 connected between the
3
/
16
1
/
2
-in. tube nut 2 that connects the
1
/
4
-in. open-end wrench while
B-701964-00 Rev. C
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