21 JANUARY 2003
10.3.24.2.3. Rate-of-Flow Defuel Valve (41AF). Check rate of flow control and check valve
function. Set flow rate at 200 gallons per minute.
10.3.24.2.4. Pressure Relief Valve (50AF-2). Check pressure-relief function. The typical
pressure setting is 10 psi above normal inlet pressure for the 90AF-8.
10.3.24.2.5. High-Level Shut-Off Valve (129AF). When the tank is being filled, check for
proper operation of the high-level control valve. Check high-level alarms with high-level
control valves. Set shut-off level at 11 inches from the top of the tank or 95% full, whichever
10.3.24.2.6. Non-Surge Check Valve (81AF-8). Check opening speed (about 20 seconds)
and check valve function.
10.3.24.3. Type II Modified Pritchard System.
10.3.24.3.1. Combination Rate-of-Flow, Solenoid Shutoff, and Check Valve (41AF-10).
Check rate-of-flow control, check-valve function, and solenoid functions. Set at 200 gallons
10.3.24.3.2. Combination Dual Pressure Relief, Solenoid Shutoff, and Check Valve (51AF-
4). Check low- and high-pressure relief functions, check-valve function, solenoid functions,
and closing speed control. See Chapter 5 for pressure setting procedures.
10.3.24.4. Type III Constant-Pressure Hydrant Fueling System (Phillips System).
10.3.24.4.1. High-Level Shut-Off Valve (413AF-5A). When the tank is being filled, check
for proper operation of the high-level control valve.
CAUTION: When testing, use the minimum flow rate necessary.
10.3.24.4.2. Rate of Flow, Non-Surge Check Valve (41AF-1A). Check opening speed, flow
rate, and check-valve function. The typical opening speed is approximately 20 seconds. The
typical flow rate is 650 gallons per minute.
10.3.24.4.3. Fuel Shut-off Control Valve (41AF-2C). Check rate of flow, check-valve
function, and water shutoff features. The typical setting is 600 gallons per minute.
10.3.24.4.4. Back Pressure Control Valve (58AF-9). Check pressure control, closing rate
speed, solenoid operation, and check-valve function. The typical setting is 100 psi at the
inlet of the furthest hydrant outlet, and set closing speed control as fast as possible while still
maintaining smooth operation. NOTE: This valve typically uses a restrictor to aid in
10.3.24.4.5. Defuel/Flush Valve (58AF-9-1). Check pressure relief, check-valve function,
solenoid operation, and opening and closing speed controls. The typical pressure relief