-
A waste service panel
-The pipelines (overfloor and underfloor).
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R Vacuum Toilet System - Schematic Figure 002A
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4. Component Description
_____________________
**ON A/C 001-003, 051-052,
A. Vacuum Toilet Assembly 50MG
(Ref. Fig. 003)
Each toilet assembly has:
-
A bowl and spray ring
-
A water (rinse) valve and screen
-An anti-syphon valve
-
A flush valve
-
A manual waste shutoff valve
-
A flush control unit
-
A supporting frame.
(1)
Bowl and Spray Ring The bowl is made of stainless-steel and has a nonstick coating applied to its inside surface. The spray ring is attached to the top of the bowl and connected to the anti-syphon valve.
(2)
Water (Rinse) Valve The water (rinse) valve is solenoid controlled and is connected electrically to the flush control unit. It has a fitting for the aircraft system interface and a strainer. The outlet of the valve is connected to the anti-syphon valve.
(3)
Anti-Syphon Valve The anti-syphon valve is installed above the toilet bowl and is connected to the water valve and the spray ring. It permits water to flow only in the direction of the spray ring and returns any back-water to the bowl.
(4)
Flush Valve The flush valve is a motor-actuated self-contained unit. A duct connects the flush valve to the toilet bowl. The flush valve housing is a stainless-steel investment casting. Waste flows through a 2.0 in. (50.7999 mm) dia. molded and reinforced elastomer tube. The tube is fully open during the flush cycle. A motor-actuated pinch-knife closes and seals the tube between the flush cycles. The flush control unit controls the flush valve operation. A manual waste shutoff valve is installed on the downstream side of the flush valve.
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Vacuum Toilet Assembly 50MG
Figure 003
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(5)
Manual Waste Shutoff Valve The Manual Waste shutoff Valve (MWV) is installed on the downstream side of the flush valve. It is a back-up system to shutoff the flush line in case of a flush valve failure in the open position. A 2.0 in. (50.7999 mm) dia. duct connects the outlet of the shutoff valve to the aircraft system interface. A handle accessible from the front of the toilet assembly activates the sliding mechanism inside the shutoff valve.
(6)
Flush Control Unit The flush control unit is an electronic assembly installed on the supporting frame of the toilet assembly. It is connected electrically to the:
-Flush switch
-Water (rinse) valve and screen
-Flush valve
-Vacuum system controller. The unit controls the time and sequence of the toilet operation during the flush cycle. Built-in-test Equipment (BITE), monitors the operation of the water valve, flush valve and its internal control board circuitry. Faults are transmitted to the vacuum system controller.
**ON A/C 004-049, 062-099, 101-105, 151-199, 201-299,
A. Vacuum Toilet Assembly 50MG
(Ref. Fig. 003A)
Each toilet assembly has:
-
A bowl and spray ring
-
A water (rinse) valve and screen
-An anti-syphon valve
-
A flush valve
-
A flush control unit
-
A supporting frame.
(1)
Bowl and Spray Ring The bowl is made of stainless-steel and has a nonstick coating applied to its inside surface. The spray ring is attached to the top of the bowl and connected to the anti-syphon valve.
(2)
Water Valve and screen (Rinse Valve) The water (rinse) valve is a solenoid controlled plunger type. It is connected electrically to the flush control unit. It has an integral water inlet fitting and a finger-type stainless steel-screenr. The outlet of the valve is connected to the anti-syphon valve.
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Vacuum Toilet Assembly 50MG
Figure 003A
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(3)
Anti-Syphon Valve The anti-syphon valve is installed above the toilet bowl and is connected to the water valve and the spray ring. It permits water to flow only in the direction of the spray ring and returns any back-water to the bowl.
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