In ships preceding CV-67, a thrust unit anchors the
aft end of the launching engine and connects the steam
accumulator to the launch valve. An exhaust tee
mounted between the launch valve and the aft power
cylinders also provides connection to the exhaust valve.
CAPACITY SELECTOR VALVE (CSV)
The CSV (fig. 4-10) provides the means of varying
the energy output of the catapult by controlling the
opening rate of the launch valve for aircraft of various
types and weights. An electric motor unit assembly is
used to position the CSV spindle, which meters the
flow of fluid from the operating cylinder when the
launch valve is opening, changing the valve setting for
different capacity launchings. A handwheel is provided
to change the valve setting should the automatic control
become inoperative. For complete information
concerning the CSV assembly, refer to technical
manual NAVAIR 51-15ABE-1.
LAUNCH-VALVE CONTROL VALVE
The launching-valve control valve (fig. 4-11)
directs pressurized hydraulic fluid to the launch valve
hydraulic cylinder to open or close the launch valve.
The control valve consists of a valve body enclosed on
both ends by glands. A piston within the valve divides
the control valve into seven chambers. Piping connects
each chamber of the control valve to other components.
As the launching valves go through their opening and
closing cycles, fluid is being directed to the operating
chambers by the action of the sliding piston, lining up
the ports and allowing pressurized fluid to enter one
chamber while venting the other chamber to gravity. A
tailrod is attached to each end of the piston. The tailrods
extend through the gland and provide a visual
indication of the position of the control valve.
Pressurized fluid used to shift the control valve is
supplied through the launch valve solenoid-operated
hydraulic lock valve.
4-9
ELECTRIC MOTOR
ENCODER
VENT VALVE
INSTRUCTION
PLATELUBRICATION
FITTING
REVOLUTION
COUNTER
CAPACITY
SELECTOR
VALVE
OUTLET
(PORT M)
INLET (PORT L)
DECLUTCH LEVER
MOTOR UNIT
LOCKPIN
LUBRICATION
FITTING
HANDWHEEL
ABEf0411
ENCODER
Figure 4-10.—Capacity selector valve assembly.
