The refuel coupling cap has:
-
a cover plate
-
a handle assembly
-
a guide ring assembly
-three rollers
-a chain assembly. Two screws attach the handle assembly to the cover assembly. When the trigger is pushed a torsion spring lifts the handle assembly. The guide ring assembly and the rollers are in the cover body. The guide ring assembly is spring-loaded and has an O-ring. When the cap is installed the O-ring seals the cap to the refuel/defuel coupling and the rollers engage three bayonet lugs on the coupling. The cap is attached to
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the refuel/defuel coupling with the chain assembly. The chain assembly is
spring-loaded inside a tube, this makes sure the chain goes safely into
storage when the cap is installed.
R **ON A/C 051-051,
R C. Refuel Coupling Cap 101QM(41QM)
R (Ref. Fig. 007)
R
R The refuel coupling cap has:
R - a cover assembly
R - a handle assembly
R - a guide ring assembly
R - three rollers
R - a cable assembly.
R Two screws attach the handle assembly to the cover assembly. When the
R trigger is pushed a torsion spring lifts the handle assembly.
R The guide ring assembly and the rollers are in the cover body. The guide
R ring assembly is spring-loaded and has an O-ring. When the cap is
R installed, the O-ring seals the cap to the refuel/defuel coupling and the
R rollers engage three bayonet lugs on the coupling. The cap is attached to
R the refuel/defuel coupling with the chain assembly. The chain assembly is
R spring-loaded into a protective cover for correct storage during
R installation of the cap.
R **ON A/C ALL
D. Refuel Valve 7QU(8QU), 10QU
(Ref. Fig. 008)
The primary components of the refuel valve are:
- the body
- the piston and compression springs
- the electro-magnetic valve (solenoid valve)
- the manual command button and valve
- the flap valves.
The piston and the body make an internal (piston) chamber. The solenoid
valve controls the flow of fuel from the piston chamber to the refuel
gallery. The manual command valve can also control the flow of fuel from
the piston chamber to the refuel gallery. The flap valves stop fuel
returning from the refuel gallery into the refuel valve. The refuel
valves are installed in canisters:
- the refuel valve 7QU in the refuel valve canister 19QM
- the refuel valve 8QU in the refuel valve canister 20QM
- the refuel valve 10QU in the refuel valve canister 88QM.
Refuel Valve - Schematic Figure 008
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Operation
When the solenoid valve is de-energized a hydraulic-lock (fuel) is made behind the refuel valve piston. This hydraulic-lock and the compression springs hold the piston in the closed position.
When the solenoid valve is energized, the hydraulic-lock is released. The fuel pressure then pushes the piston (against the spring pressure) to the open position. The fuel that made the hydraulic-lock is pushed through the solenoid valve and into the refuel gallery. When the solenoid is de-energized, the hydraulic-lock is made again. Fuel pressure behind the piston increases and (together with the spring pressure) moves the piston to the closed position.
The manual command button (on the front of the valve body) connects directly to the manual command valve. If the solenoid valve does not operate, the manual command button can be pushed in (and held) to release the hydraulic-lock. The refuel valve then operates as usual.
E. Refuel Valve Canister 19QM(20QM), 88QM (Ref. Fig. 009) The primary components of the refuel valve canister are:
-
the canister body assembly
-
the check valve housing assembly
-
the sleeve
-
the spring
-
the check valve assembly.
Four screws and four nuts join the canister body assembly to the check
valve housing assembly to make the refuel valve canister.
The refuel valve canister has an inlet port, an outlet port and a
mounting flange for installation to the aircraft fuel tank.
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