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SUMMARY - 14003_154
Main Fuel/Defuel Valve

Aviation Boatswains Mate F - Aviation theories and other practices
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CHAPTER 5 JP-5 AFLOAT FLIGHT DECK SYSTEMS AND OPERATIONS Working the flight deck of an aircraft carrier is one of the most exciting and dangerous jobs you can have. Additionally, the ABF works with highly flammable fuels. Though the below decks system is more complex, the ABF working on the flight deck must be equally knowledgeable in the flight deck system, its components, and correct operating procedures. This chapter will identify the components used for flight and hangar deck operations and explain the correct operating procedures. As with below decks, the arrangement of the flight deck system will vary from ship to ship. The information in this chapter is based on typical arrangements. JP-5 FLIGHT DECK SYSTEM COMPONENTS LEARNING OBJECTIVES: Identify the com- ponents that make up the JP-5 flight and hangar deck fueling system. Describe their function and principles of operation. The flight and hangar deck fueling system is built around the Cla-Val fueling unit. The number and location of these units depend on the individual ship. Typically, each refueling station contains three or four hose reels, each having its own Cla-Val. In this section, we will identify and describe the components in the flight and hangar deck JP-5 sys- tem. CLA-VAL FUEL/DEFUEL VALVE The CLA-VAL fueling unit (fig. 5-1) 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 per- forms 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. Figure 5-1.—Cla-Val fuel/defuel valve assembly. 5-1







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