R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 004)
The pressure holding valve 124QM(125QM) is on an adapter that attaches to
the outboard face of RIB17. When the recirculation system is in operation,
the pressure holding valve keeps a pressure of 1.07 bar (15.5 psi) in the
recirculation pipe. This pressure makes sure that the warm fuel in the
recirculation pipe does not boil.
**ON A/C 301-399,
(Ref. Fig. 004A)
The pressure holding valve 218QM(219QM) is in an adapter that attaches to
the inboard face of RIB15. When the recirculation system is in operation,
the pressure holding valve keeps a pressure of 1.07 bar (15.5 psi) in the
recirculation pipe. This pressure makes sure that the warm fuel in the
recirculation pipe does not boil.
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Check Valve 122QM(123QM) - Location and Detail Figure 002
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R Check Valve 222QM(223QM), 224QM(225QM) - Location R Figure 003
R 1EFF : 301-399, 1 28-16-00Page 7 1 1 May 01/04 1 1 1CES 1
Pressure Holding Valve 124QM(125QM)
Figure 004
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Pressure Holding Valve 218QM(219QM)
Figure 004A
R 1EFF : 301-399, 1 28-16-00 Page 9
1 1 May 01/05
1 1
1CES 1
**ON A/C ALL
4.
Power Supply
____________
Not applicable
5.
Interface
_________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 005)
**ON A/C 301-399,
(Ref. Fig. 005A)
**ON A/C ALL
6. Component Description
_____________________
A. Recirculation Check Valve 122QM(123QM)
**ON A/C 301-399,
(Ref. Fig. 003)
**ON A/C ALL
The recirculation check valve has:
-a valve body with a mounting flange
-an end connection
-a valve-plate, arm and spring.
The end connection is bolted to the valve body. An O-ring seal, between the valve body and the end connection, seals the joint. The valve-plate, arm and spring are attached to the end connection with a dowel pin.
The mounting flange attaches the valve body (through an adapter, insulating block and mounting block) to the lower surface of the wing bottom skin. An O-ring seal is installed (in a groove in the mounting flange) to prevent a fuel leak through the mounting flange. A bonding lug is attached to the mounting flange.
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Recirculation System - Interfaces
Figure 005
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R Recirculation System - Interfaces
R Figure 005A
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1 1 May 01/04
1 1
1CES 1
The valve body contains the valve-plate, arm and spring. A dowel pin connects these items to the valve body and the spring holds the valve-plate in the closed position. Inlet fuel pressure lifts the valve-plate which lets the fuel flow through the check valve. When the fuel pressure comes from the outlet direction, the valve-plate closes and prevents a fuel flow back through the check valve.
**ON A/C 301-399,
B. Recirculation Check Valve 222QM(223QM), 224QM(225QM)
(Ref. Fig. 006)
The recirculation check valve has:
-two half bodies (inlet and outlet)
-
a spindle and a special washer
-
a spring
-
a spindle guide. The two half bodies are joined by three countersunk bolts and three nuts. An O-ring seal, between the 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.
A flow of fuel from the main fuel pumps (Ref. 28-21-00) opens the valve against spring pressure. When the flow of fuel stops, the spring closes the valve.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
C. Recirculation Pressure-Holding Valve 124QM(125QM)
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