The inlet and outlet ports have square mounting flanges, with four holes,
 for installation to the applicable aircraft system fuel-pipes. The
 mounting flange has four holes for installation to the aircraft and four
 threaded studs for installation of the refuel valve.

 PTFE sealing rings prevent fuel leaks between the refuel valve, the
 sleeve, and the canister body.

 When the refuel valve is removed the spring moves the sleeve over the
 inlet port to stop fuel flow into the canister. When the refuel valve is
 installed it pushes the sleeve away from the inlet port to open it to the
 canister.

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 Refuel Valve Canister Figure 009
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 The check valve assembly is in the check valve housing. The check valve assembly has two flaps and a torsion spring. When there is no fuel flow through the refuel valve the torsion spring moves the two flaps to close the outlet port. When there is fuel pressure in the refuel valve canister the flaps open against spring pressure.
 F. Defuel/Transfer Valve 11QM (Ref. Fig. 010)
 The primary components of the defuel/transfer valve are:
 -
the valve body

 -
the ball valve with a 38,1mm (1.5in) bore

 -
the valve spindle

 -
the housing.

 The ball valve is installed in the valve body. The valve body and the housing are attached to a mating flange. The valve spindle is installed in the housing and engages the ball valve in the mating flange. The housing has a mounting flange with four threaded studs to attach the defuel/transfer valve to the center tank inner skin. The valve spindle has a location slot in one end to engage a lug in the drive gear of the defuel/transfer valve actuator.
 G. Defuel/Transfer Valve Actuator 11QU (Ref. Fig. 010)
 The actuator has a body with a mounting flange. The body holds a 28VDC electrical motor. This motor drives a gear which turns the defuel/transfer valve through 90 degrees. There is a mechanical indicator on the body which shows the position of the actuator (open or closed). The V-band clamp (82QM) attaches the actuator to the defuel/transfer valve.
 H. Overwing Refuel Adapter 42QM(43QM) and Refuel Cap 44QM(45QM) (Ref. Fig. 011)
 The primary components of the overwing refuel adaptor are:
 -
the adaptor

 -
the adaptor nut

 -
the locking plate and lanyard.

 The overwing refuel adaptor and its refuel cap are installed in the wing upper skin. The adaptor nut (with the locking plate) holds the adaptor in position. Two O-ring seals seal the joint between the adaptor and the wing upper skin. The lanyard attaches the refuel cap to the locking plate.
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 Defuel/Transfer Valve (11QM) and Actuator (11QU) Figure 010 
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 Overwing Refuel Adaptor and Cap Figure 011
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 J. Refuel Diffuser
 (Ref. Fig. 012)

 The diffuser has:
 -
a casing assembly

 -
a diffuser pipe

 -
a connector.
 The diffuser pipe is installed in the casing assembly. Three bolts attach
 the connector and the diffuser pipe to one end of the casing assembly.
 The connector is attached to the refuel gallery.
 When fuel enters the diffuser pipe from the connector it is passed out
 through many small holes in the diffuser pipe. The fuel travels along the
 bottom of the casing assembly and out into the fuel tank. The diffuser
 makes sure that the fuel enters the fuel tank smoothly.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 K. Air Inlet Valve 161QM(162QM)
 (Ref. Fig. 013)

 The primary components of the air inlet valve are:
 -
the body

 -
the end-housing

 -
the poppet-valve and spring

 -
the float assembly.

 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 float assembly attaches to the end-face of the body (with a hinge-pin). The float assembly closes the valve when the fuel level in the tank is at a given level. If there is no fuel pressure in the chamber, the spring holds the poppet-valve open and lets air into the chamber, and thus into the refuel gallery. 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.
　
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