UFC 3-460-03
21 JANUARY 2003
10.3.24. Automatic Control Valves. Following is a list of valves by type of system and valve
function. The numbers shown after each valve are Cla-Val designations. Actions and frequencies
required below are not limited to Cla-Val, but apply to all manufacturers' valves having the same
function. Any automatic valves not listed will have a Quarterly RWP frequency. NOTE: The
amount of maintenance required on the listed automatic valves will vary with each inspection. The
intent of the inspection is to determine the valves proper operation and performance. If it is
determined that the valve is operating correctly, pilot control adjustment and/or main valve
calibration is not required.
10.3.24.1. Type I Panero System.
10.3.24.1.1. High Level Shut-Off Valve (HLSO) (124AF). When the tank is being filled,
check for proper operation of the HLSO valve. Check high-level alarms with high-level
control valves. Set valve to activate when the fuel level is approximately 11 inches from the
top of the tank. this should be no more than 95% full.
FREQUENCY: Semi-annually.
10.3.24.1.2. Non-Surge/Check Valve (81AF). Check opening speed (approximately 20
seconds) and check valve function.
FREQUENCY: Semi-annually.
10.3.24.1.3. Fuel Shut-Off Control Valve (FSCV) (40AF-2A).
10.3.24.1.3.1. Flow Rate. Check flow rate. Flow rate is determined by F/S vessel gallon-
per-minute rating, or element flow rate, whichever is less.
FREQUENCY: Semi-annually.
10.3.24.1.3.2. Water Shut-off. Test FSCV, either by engaging the flanged float test
button or lever while flowing fuel through the F/S, or by injecting water until the ball
float is in the "up" position. Ensure the FSCV shuts off when the ball float is in the "up"
position. When the mission mandates the use of water drain valves, check the drain valve
operation also. Drain water immediately upon completing the test.
CAUTION: When performing this test, only flow the minimum amount of fuel through
the F/S to prevent system pressure spikes. Check FSCV on 50-gallon-per-minute product
recovery tank pumps. Newer Type III systems have FSCVs with emergency shutdown
capability.
FREQUENCY: When elements are changed.
10.3.24.1.4. Fueling/Defueling Control Valve (302AF). Check both refueling and defueling
control valve features. Check pressure-reducing control, pressure-relief control, opening
rate, excess flow shutoff, defuel pressure-relief control, and solenoid operation. See Chapter
3 for pressure setting procedures.
FREQUENCY: Quarterly.
10.3.24.2. Type II Pritchard System.
10.3.24.2.1. Refueling Control Valve (90AF-8). Check pressure-reducing control, pressure-
relief control, opening rate, excess flow shutoff, and solenoid operation. See Chapter 4 for
pressure setting procedures. For excess flow control, see Attachment 3.
FREQUENCY: Quarterly.
10.3.24.2.2. Defuel Control Valve (134AF). Check solenoid operation.
FREQUENCY: Quarterly.
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