*
Actuator
*
Ball (internal)
*
Body.
The valve attaches with four bolts.
The aft system drain valve has two control cables. One attaches to the aft system drain valve control handle and to the valve actuator. The other attaches to the valve actuator and to the tank drain valve (not shown).
The forward system drain valve (not shown) has one cable that attaches to the valve actuator and to the forward system drain valve control handle (not shown).
The control cables are a push-pull type.
Location
The aft system drain valve is below the floor of the aft cargo compartment. It is near the bulk cargo compartment, inboard and aft of the last powered drive unit on the left side (PDU 11L).
The forward system drain valve is below the floor of the forward cargo compartment. It is near the aft part of the compartment, inboard of powered drive unit number 14 right (PDU 14R).
The control handle for the forward potable water system drain valve is on the forward potable water system drain panel (not shown).
The control handle for the aft valve is on the aft potable water service panel (not shown).
Functional Description
The control cables open the related valve(s) when you pull on the system drain valve control handle. The valve(s) closes when you push the handle.
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WATER STORAGE AND DISTRIBUTION -DRAIN VALVE AND CONTROL CABLE
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WATER STORAGE AND DISTRIBUTION -TANK DRAIN VALVE AND CONTROL CABLE
Purpose
The tank drain valve lets water drain overboard from the water tanks and the aft section of the overhead water distribution lines. The control cable sets the position of the tank drain valve.
Physical Description
The tank drain valve is dual-ball type of valve. The valve has these parts:
*
Handle
*
Shaft (2)
*
Cover assembly with two internal gears
*
Ball (internal) (2)
*
Drain line connection (2)
*
Body.
The tank drain valve has an open and a closed position.
The valve has a control cable that attaches to the valve handle and to the aft system drain valve (not shown). The control cable is a push-pull type.
Location
The drain valve is behind the right end wall of the bulk cargo compartment. It is below the water tanks.
Functional Description
The control cable sets the position of the valve handle to the same position as the aft system drain valve. The handle is on a shaft connected by internal gears to a second shaft. Each shaft has a ball that attaches to it (internal to the body). The handle turns the gears and balls when the handle moves.
Control cables open the aft system drain valve and the tank drain valve when you pull on the aft system drain valve control handle (not shown). The valves closes when you push the handle. The aft system drain valve control handle is on the aft potable water service panel (not shown).
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WATER STORAGE AND DISTRIBUTION -TANK DRAIN VALVE AND CONTROL CABLE
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WATER STORAGE AND DISTRIBUTION -ISOLATION VALVE AND CONTROL CABLE
Purpose
The isolation valve lets you isolate the overhead distribution lines that supply water to the forward and mid lavatories and galleys.
Physical Description
The valve has two positions: open and closed.
The valve has a manual actuator. A control cable attaches to the actuator. This allows you to manually open and close the valve.
The valve attaches with four bolts. It has two water line connectors.
Location
The isolation valve is above the ceiling in the aft part of the passenger compartment. To get access, remove the ceiling panel that is above the left aisle next to a center overhead stowage bin.
The isolation handle is behind a panel above the passenger/ entry door 4 left.
Functional Description
The control cable opens and closes the valve when you operate the isolation handle.
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WATER STORAGE AND DISTRIBUTION -ISOLATION VALVE AND CONTROL CABLE
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WATER STORAGE AND DISTRIBUTION -ISOLATION/DRAIN VALVE AND CONTROL CABLE
Purpose
The isolation/drain valve lets you isolate the overhead distribution lines that supply water to the forward lavatories and galleys. It also permits you to drain the forward part of the overhead distribution line overboard.
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