HYDRAULIC CYLINDER ASSEMBLY
The hydraulic cylinder assembly (fig. 4-8) is
connected to the operation control assembly. The
hydraulic cylinder assembly is actuated by pressurized
hydraulic fluid to open and close the steam valve
assembly. When pressurized fluid is applied to port E,
the piston moves to the opposite end of the cylinder to
open the steam valve. The rate of movement of the
piston is faster at the beginning of the stroke, because of
4-7
FRAME
LIFTER
LINK
LIFTER LEVER
LIFT NUT
THRUST RING
ADJUSTING NUT
HEAD-COVER
PLATE
ROTATOR
LEVER
ROTATOR
LINK
CROSSHEAD
ABEf0408
Figure 4-7.—Launch valve operation control assembly.
ORIFICE
SNUBBER
PISTON
CYLINDER
FLANGE
PISTON ROD
PORT E
(OPENING PORT)
METERING ROD
PORT A
(CLOSING PORT)
PORT B
FLANGE
ABEf0409
Figure 4-8.—Launch valve hydraulic cylinder.
