30
VALVE BLOCK
for special mounting of servo valve
(after 7-93)
S23-12776
See figure 13.
Note: Do not use impact tools or over tighten threaded parts.
Wash and dry all parts. During assembly, lapped and ground surfaces should be kept
lubricated with clean oil and protected from nicks or surface damage.
Place valve block (1) with the six poppet valve bores up in order to press two roll pins
(46) in position. (Roll pins to be .12" (3.04 mm) below surface of valve block).
Install four orifice plugs (3) into valve block (1) and tighten in place.
Disassemble the strainer assembly (14) and reassemble per the following steps:
a. Install the orifice screw of the strainer assembly into valve block. Thread elastic stop
nut onto the orifice screw and torque to 23 lb-in. (2.6 Nm).
b. Install clean filter screen on strainer support and secure in place with socket head
cap screw, 6-32 x 1/4" long. Torque 6-32 screw to 13 lb-in (1.47 Nm).
Place valve block with poppet valve bores facing up. Position gasket (29) on valve block.
Place springs (33), 1.43" (36.3 mm) into outer most bores at each end of the valve block.
Place sequence poppets (30) over these springs. Position seats (27) small shoulder side
first over poppets.
ASSEMBLY PROCEDURES
Figure 13