9
4
．
Precautions
Caution
4-1. Air piping
Hold the speed controller on the piping port
(Rc1/8)
lightly and connect the tube. Do not to apply excessive external
force to the fittings. The end lock may not operate correctly without using the two position five port valve.
4-2
．
Installation
Tighten the bolts gradually and diagonally
(star pattern when possible)
by constant torque to avoid uneven force to
the bolts. When installing the bonnet assembly and gate, refer to the maintenance procedure for tightening of the
bolts.
•
Utilize OPEN condition when Bonnet assembly is installed.
•
Avoid scratching critical sealing surfaces during maintenance & installation
•
The compression of the O-rings on the user's application should target 0.7 to 0.9mm.
Otherwise, improper compression could result in potential leak path.
•
Always use proper torque for fasteners, fittings, bolts, etc.. Otherwise bolt and valve body thread engagement could
create valve damage.
4-3
．
Disinstallation
OPEN
valve prior to removal of Bonnet assembly during maintenance procedures. If Bonnet assembly is removed at
CLOSE
condition then Body's threads and critical sealing surfaces could be damaged.
4-4
．
End lock release
When unlocking the Gate valve that has previously lost air pressure during emergency shut off. First, apply pressure to
the air port that was last energized. The cycle should be finished that was in motion. This completion of cycle that
was not completed during pressure loss is critical to release end lock and switch the solenoid valve.
Example 1
: The gate of the valve assembly is closed before shipment, so apply pressure to the closed position first.
Example 2:
If the gate is opened, apply pressure to the "
open
" side of air piping, and switch the valve after
releasing the end lock.
The type of Gate valve design can vary gate configuration during shipment. This is done to protect precision vacuum
components throughout transport.
1.
Insert type: Gate is OPEN so please supply the pressure to
OPEN
port first.
2.
With Body type: Gate is CLOSED so supply the pressure to
CLOSE
port first.
Ignoring these concerns could lock the gate valve assembly, and potentially damaging components.
