Refuel Diffuser Figure 012
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Air Inlet Valve 161QM(162QM) and Fuel Drain Valve
Figure 013
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-25-00Page 45 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C 301-399,
K. Air Inlet Valve
(Ref. Fig. 013A)
The air inlet valve has:
-
a valve body
-
a ball valve
-
a banjo
-
a banjo bolt.
The ball valve is in the valve body and is free to move within it. The banjo bolt attaches the banjo to the valve body. The air inlet pipe connects the banjo to the outboard side of RIB21. The air inlet valve lets air into the refuel gallery so that the gallery can drain. Fuel pressure in the refuel gallery will cause the valve to close to prevent uncontrolled flow of fuel into the fuel tank.
**ON A/C ALL
L. Fuel Drain Valve 31QM(32QM)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 013)
**ON A/C 301-399,
(Ref. Fig. 013A)
**ON A/C ALL
The primary components of the fuel drain valve are:
-
the body
-
the end-housing
-
the poppet-valve and spring
-
the flap-valve and a torsion-spring.
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Air Inlet Valve and Fuel Drain Valve
Figure 013A
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The body and the end-housing connect together to make a valve chamber. An O-ring seals the joint between the body and the end-housing. The poppet-valve and the spring are in the valve chamber. The flap-valve attaches to the end-face of the body (with a hinge-pin) and is kept closed with the torsion-spring. If there is no fuel pressure in the chamber, the spring holds the poppet-valve open. When a fuel pressure more than 0.20 bar (3.0 psi) is felt in the chamber, the poppet-valve closes against the spring. When the pressure decreases to less than 0.14 bar (2.0 psi) the spring opens the poppet-valve. This lets the remaining fuel pressure open the flap-valve and decrease to zero. When the pressure is zero, the torsion-spring closes the flap-valve to prevent a fuel flow in the opposite direction.
M. Pressure Relief Valve 97QM (Ref. Fig. 014)
The primary components of the pressure relief valve are:
-
the mounting flange assembly
-
the valve pad assembly
-
the spider
-
the spring
-
the spring retainer
-
the bolt.
The mounting flange assembly is on the RH RIB1 of the center tank. The mounting flange assembly has a hole to let the fuel pass through it. The valve pad assembly seals this hole. Spring pressure holds the valve pad assembly against the mounting flange assembly. The spring is between the spider and the spring retainer. The bolt keeps all these items on the valve pad.
Fuel pressure in the center tank greater than the spring pressure on the valve pad assembly will open the valve. The fuel then moves from the center tank to the RH wing tank. When the fuel pressure in the center tank is less than the spring pressure on the valve pad assembly, the valve will close.
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Pressure Relief Valve 97QM Figure 014
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7. Operation/Control and Indicating________________________________ (Ref. Fig. 015)
A. Pressure Refueling When you use manual pressure refuel, the total quantity of fuel put into the aircraft (and the supply to each tank) is controlled at the refuel/defuel control panel (800VU).
When you use automatic pressure refuel, the total quantity of fuel put into the aircraft is controlled at the preselector (5QT). The fuel supply to each tank is monitored at the indicator (6QT). The maximum refuel pressure at the refuel/defuel coupling is 3.45 bar (50 psi). This refuel pressure will give an all tank refuel rate of approximately 1400 l/min (370 US gal/min). At this refuel rate you can refuel the aircraft (from its usual reserves to full) in approximately 20 minutes.
The necessary total quantity of fuel is set when you move the rocker switch, on the preselector, to INC (increase) or DEC (decrease). The quantity of fuel that is set is shown in the PRESELECTED display. The total contents actually in the tanks is shown in the ACTUAL display.
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