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PRESSURE REGULATOR
MAIN HYDRAULIC ACCUMULATOR

Aviation Boatswains Mate E - Aviation theories and other practices
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into an extended bridle tensioner piston rod. This limit switch is also part of the MANEUVER AFT circuit. This circuit ensures that the tensioner piston rod is fully aft, allowing the grab latch to remain locked to the shuttle in an aircraft-launch-abort situation. Internal Tensioning Components The   internal   tensioning   is   comprised   of   com- ponents that cause the retraction engine motor to slowly rotate  and  consists  of  a  pressure  regulator,  and  a  inlet and outlet valve. Pressure Regulator The   pressure   regulator   is   used   to   reduce   ac- cumulator pressure to the pressure required to move the grab and shuttle forward (creep rate) a distance of six feet in 30-50 seconds. Internal Tensioning Inlet and Outlet Valve The   internal   tensioning   inlet   and   outlet   valve controls the flow of reduced pressure hydraulic fluid to and from the hydraulic motor and orifice bypass piping during  the  tensioning  phase.  When  actuated  by  the bridle tensioner pilot valve, reduced pressure hydraulic fluid  flows  through  the  inlet  valve  to  the  hydraulic motor and orifice bypass piping. Hydraulic fluid from the  motor  and  bypass  piping  is  routed  to  the  gravity tank    through    the    outlet    valve.    This    enables    the hydraulic motor to rotate the drum slowly so that static friction  in  the  retraction  engine  and  drive  system  is overcome. Internal Tension Relief Valve The relief valve is set to relieve at 225 psi over the normal internal tension pressure. HYDRAULIC SYSTEM LEARNING  OBJECTIVES:   Describe   the components of the hydraulic system. Describe the function of the hydraulic system. The hydraulic system (fig. 4-39) supplies pressurized  fluid  to  the  hydraulic  components  of  the catapult.   The   system   consists   of   a   main   hydraulic accumulator, an air flask, three main hydraulic pumps, a  booster  pump  and  filter  unit,  a  gravity  tank,  a  90 gallon auxiliary tank, and a circulating pump. 4-31 TO MAIN HYDRAULIC ACCUMULATOR (NOT SHOWN) DELIVERY CONTROL UNIT SUCTION LINE STRAINER TO FLUID COOLER/ GRAVITY TANK MAIN HYDRAULIC PUMP GRAVITY TANK AUXILIARY TANK FLUID FILTER CIRCULATING PUMP BOOSTER PUMP BOOSTER PUMP FILTER ABEf0440 Figure 4-39.—Retraction engine hydraulic system.







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