(5)  
Connect the two tie-rods that attach to the ball valve.

 S 434-017
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A
737-300/400/500MAINTENANCE MANUAL
 S 434-018
 (6)  Tighten the two clamps.
 S 834-029
 (7)  Make sure the ball valve is fully closed when the T-handle is in the
 fully up position.
 NOTE:____ Adjust the clevis on the service panel side of the ball valve
 if the ball valve does not close fully.

 S 834-030
 (8)  Make sure the cable moves 1/2 inch before the drain valve on the toilet tank begins to move.
 NOTE: Adjust the clevis on the toilet tank side of the ball valve
____ to get the 1/2 inch of movement.
 S 794-031
 (9)  
Do a test that makes sure the ball valve does not leak (AMM 38-32-00/501).

 S 864-019

 (10)
 Remove the protective plastic cover from under the ball valve area.

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2.

3.

4.

5.

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737-300/400/500MAINTENANCE MANUAL
 WATER TANK PRESSURIZATION SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________________
General
_______
 A.  The potable water tank uses air pressure from the pneumatic manifold to move the water to the lavatories and the galleys. The pneumatic manifold supplies bleed air from engine number one, engine number two, and the APU. The potable water tank location is aft of the aft cargo compartment (Fig. 1).
 B.  An alternate way of pressurizing the water tank on the ground is by connecting a nitrogen source to the air valve on the water service panel.
 C.  All water tank pressurization system air passes through an air filter and pressure regulator on way to the water tank. The air is filtered to prevent contamination. The pressure regulator reduces the air pressure and maintains 25 psi in the water tank. Check valves in the system prevent reverse pressurization (Fig. 1 and 2).
Pressure Regulator (Fig. 1)
__________________
 A.  The pressure regulator is installed above the water tank aft of the aft cargo compartment. The pressure regulator reduces the air pressure from the pneumatic manifold to 25 |2 psi if the 1552-002-9 pressure regulator is installed. The pneumatic manifold is 35 |2 psi if the 1552-002-19 pressure regulator is installed.
Air Filter (Fig. 1)
__________
 A.  The air filter is installed above the water tank aft of the aft cargo compartment. The filter contains a replaceable 10-micron filtration cellulose element. It filters all air entering the air pressure regulator.
Pressure Relief Valve (Fig. 1)
_____________________
 A.  The pressure relief valve is installed above the water tank aft of the aft cargo compartment. The relief valve prevents the water tank from being damaged by overpressurization. It is set to relieve at 50 |2.5 psi. Reset pressure is 37 psi minimum.
Air Flow Restrictor
___________________
 A.  The air flow restrictor is installed on the water tank pressurization line adjacent to the where it joins the APU air manifold (Fig. 1). The restrictor limits airflow from the pneumatic system in event of line rupture between the APU air manifold and the water tank. The restrictor protects equipment near the rupture and also precludes excessive depressurization of the pneumatic system.
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