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gauge reads 80 psi. Repressurize the system to check the setting. When complete, reopen the
manual valve upstream of the PCV.
6.4.16. PCV (58AF-3).
This 50.8-millimeter valve (Figure 6.9) reduces system pressure down to
75 psi during the system shutdown process and provides thermal relief during idle periods. The
valve has a solenoid that is energized to close the valve when a pump is running and de-energizes
when the lead pump de-energizes. When de-energized, the valve opens to reduce the system
pressure to 75 psi and the thermal relief function is operable. If the pressure rises above
75 psi, the valve opens and the excess pressure flows to the immediate operating storage tank. The
valve opening and closing speed controls are typically set at three seconds. In some cases, to
prevent valve chattering, the PCV pressure-sensing line is connected to the large defuel/flush line.
Figure 6.9. PCV (58AF-3).
188.8.131.52. Pressure Setting. Bottom the PCV 58AF-3 CRL. Place the system in the automatic mode
and pressurize the system. When the system shuts down, turn the CRL adjusting stem on the PCV
counterclockwise until the gauge reads 75 psi. Repressurize the system to check the setting.
6.4.17. HSV Check-Out Stand. The check-out stand consists of a 362AF-8 HCV with a 364AF-2
API adapter, four 63.5-millimeter (2.5-inch) single-point receptacles (SPR), and an emergency stop
switch. The HCV is piped into the hydrant loop just downstream of the issue venturi. The HSV
check-out stand is used to perform daily checks of the HSV before using it to service aircraft.
6.5. Product Recovery System.
6.5.1. Tank Design. The product recovery tank is a 15,141-liter (4000-gallon) double-walled steel
tank with an interstitial leak monitor. The annular space provided between the primary and secondary