R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
D. Scavenge Jet Pumps 66QM(69QM), 67QM(68QM), 89QM(90QM)
(Ref. Fig. 011)
The jet pump has:
-
a jet pump body
-
a jet adaptor assembly.
The jet pump body fully contains the jet adaptor assembly. The jet pump body has a flange at one end for installation to the tank rear spar. The jet pump body also has three threaded openings. These openings are as follows:
-Z is the outlet from the jet pump
-Y is the inlet from the fuel tank
-X is the inlet from the related main pump.
The jet adaptor assembly has:
-
a Non-Return Valve (NRV)
-
a jet nozzle.
The NRV has a spring and a valve assembly. If the related main pump has a failure, or is set to off, the spring closes the NRV. Thus fuel cannot enter a main pump that is set to off. When the related main pump is on, fuel goes into the jet pump through the opening X. The fuel moves through the NRV and the jet nozzle. The jet nozzle decreases the pressure and increases the velocity of the fuel that goes through it. This decrease in pressure and increase in velocity causes a suction pressure at the inlet Y. The fuel at the inlet Y is moved through the jet pump, with the fuel from the main pump, and out at the opening Z.
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Jet Pump 66QM(69QM) 67QM(68QM) 89QM(90QM)
Figure 011
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 46 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 E. Check Valve 33QM(36QM), 34QM(35QM), 37QM(38QM)
(Ref. Fig. 012)
The check valve has:
-two half bodies (inlet and outlet)
-
a spindle and a special washer
-
a spring
-
a spindle guide. Three countersunk bolts and three screws connect the two half bodies. An O-ring seal, between the two half bodies, stops fuel leaks. The special washer, the spindle, the spring and the spindle guide are installed in the two half bodies to make the valve. The shank of the spindle goes through the spindle guide. The spring is installed between the spindle and the spindle guide to keep the valve in the closed position.
**ON A/C 301-399,
E. Check Valve 149QM(151QM), 150QM(152QM)
(Ref. Fig. 009A)
The primary components of the check valve are:
-
a (flanged) body
-
a flap valve
-
a valve seat.
The valve body is connected to the fuel pump canister (transfer system)
outlet. The joint is sealed with an O-ring. A spring holds the flap valve
against the valve seat in the body.
When the fuel pressure in the main pump is more than a specified value,
the check valve opens. This lets the fuel move to the main transfer
system.
When the fuel pressure decreases (to less than a specified value), the
spring pushes the flap onto its seat and stops the fuel flow. This
prevents a flow of fuel into the main pump from the main transfer system.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
F. Sequence Valve
(Ref. Fig. 013)
The sequence valve has:
-
a valve body
-
a poppet valve
-
a spring
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Check Valve 33QM(36QM) 34QM(35QM) 37QM(38QM)
Figure 012
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 48 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1
Sequence Valve
Figure 013
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 49 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1
-a valve guide
-an upper and a lower cover.
The valve body contains the poppet valve, the spring and the valve guide. The poppet valve closes the valve body inlet and a spring keeps it in this position. The valve guide is in the top end of the valve body. The shank of the poppet valve goes through the valve guide, this makes sure that the valve is kept in position during its operation. The valve body has four openings to let the fuel out and back into its related fuel tank. The covers prevent damage to the valve and make sure that the fuel enters the tank smoothly.
When the fuel pressure at the valve inlet is more than 1.74 bar (25.3 psi), the valve opens. The fuel then moves from the valve inlet back into its related fuel tank. When the fuel pressure at the valve inlet decreases to a specified value, the valve closes.
**ON A/C ALL
G. Air Release Valve 86QM(87QM)
(Ref. Fig. 014)
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