Cla-val - CLA-VAL The CLA-VAL fueling unit(fig 3-2 is the...

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CLA-VAL The CLA-VAL fueling unit (fig. 3-2) is the core of the JP-5 fueling station. It is a three-port , two-way, fuel/defuel valve, of modified globe valve design that is intended for use as an integral part of the JP-5 dispensing system for shipboard use. This valve performs four distinct functions: 1. It functions as a pressure-reducing valve to maintain a constant discharge pressure not to exceed 55 psi. 2. It functions as a solenoid-operated emergency shutoff valve. 3. It functions as a pressure-relief valve when discharge pressure rises above a predetermined setting. 4. It functions as a defueling valve to evacuate the piping and hose beyond the valve discharge. MAIN (FUEL/DEFUEL) VALVE The main valve (fig. 3-3) is actually two single-seated globe valves built into a common body. Each of the valves performs a separate and distinct function, one is the fueling valve and the other is the defueling valve. Each valve employs a well-supported and reinforced diaphragm as its operating means. The fueling valve is spring-loaded to close; therefore, it is normally closed. The defuel valve is inverted (upside down) and held open by its own weight. The main valve directs fuel flow from the inlet port to the fuel port when fueling, and fuel flow from the fuel port to the defuel port when defueling. The fuel and defuel valves are controlled by pressure acting on a diaphragm. The change from the fuel to defuel mode is accomplished by energizing or deenergizing the solenoid-operated pilot valve (SOPV), or by excessive delivery pressure. When pressure above the fueling diaphragm is vented off, inlet pressure on the fueling diaphragm
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lifts its disk assembly, opening the fuel valve. Simultaneously, pressure is applied to the bottom of the defueling valve diaphragm, seating its disk assembly and closing the defuel valve. When pressure underneath the defueling diaphragm is vented off, its disk assembly falls, and the defuel valve opens. Simultaneously, pressure is applied to the top of the fuel valve diaphragm (both line and spring). When this pressure overcomes the inlet pressure, its disk assembly seats, closing the fuel valve. The main valve is controlled by a set of smaller valves using line pressure, thus providing fully automatic operations. The SOPV shifts the CLA-VAL assembly from defueling to fueling, and from fueling to defueling. The flow control valve regulates the opening speed of the fueling side of the main valve The hytrol valve either isolates inlet pressure from the pressure-reducing control valve, or vents inlet pressure to the pressure-reducing control valve and the fuel port of the main valve The pressure-reducing control valve regulates delivery pressure The ejector-strainer aids in relieving pressure above the diaphragm of the fueling valve and prevents foreign particles from entering the pressure-reducing control valve.
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