Ulvac DA-60D Instruction Manual page 25

(1)
(3)
Loctite 242
5-6 threads
Inner side of the
pump head
Suction/exhaust
valve
Pump head
2-3 threads
Loctite 242
(4)
(2)
Position of the
suction/exhaust
valves
Plain washer
Curved surface faces
towards the pump head
Step 6: Using the torque wrench with a bit size of 4 mm
(5.0 Nm), fasten the push plates for the diaphragms with
hex socket bolts (M5×16) that have Loctite 242 applied
onto 5 to 6 threads from their screw tip. When tightening
the bolts, do so in the order shown in the picture on the
left, going over them three times, gradually tightening
each one of them. In order to ensure that they are
securely tightened, go over them again five times with
the torque wrench (5.0 Nm) following the same order.
*Be sure to always follow the appropriate tightening
torque. Failure to do so can lead to product damage.
Step 7: Replace the suction/exhaust valves removed in
Step 2 with new ones, and place them at the two
locations on the inner side of the pump heads, two
valves positioned together at each location. Next, place
the plain washers on top of them with their curved
surface facing toward the pump heads, then, using the
torque screwdriver (0.8 Nm), fasten them with small
pan head screws (M3×5) that have Loctite 242 applied
onto 2 to 3 threads from their screw tips. After
tightening, check that the suction/exhaust valves are
firmly fixed to the pump heads without any space
between them.
* After tightening, make sure that there is no gap
between the suction valve and the pump head, or that
the valve does not move to right or left, as these will
lead to poor performance.
*Be careful when applying Loctite 242, as too much or
too little can cause damage.
*Be sure to always follow the appropriate tightening
torque. Failure to do so can lead to product damage.
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