AEC VacTrac Series Conveying Systems - Manual (Page 95)

VacTrac™ Series Conveying Systems Page 95
Mechanical Components WH2-605A.4
Maintaining Lower Valves
Removing Lower Valves
1. Turn off and lock out the power switch for the vacuum
power unit. Disconnect and lock out the power main to the
unit; make sure to follow applicable safety regulations.
2. Turn off compressed air. Disconnect the copper
compressed air line to the lower valve at the lower valve
body.
3. Loosen the hose clamps that connect the valve to the T-Y
tube, and slide the hose back.
4. Remove discharge silencers. Unscrew the vertical silencer
and unbolt the bracket holding the silencer under the unit.
Pull the silencer out of the valve body.
5. Loosen the set screws holding the lower valve to the blower
outlet, and remove the valve from the power unit.
Disassembling Lower Valves
1. Remove the pipe nipple and pipe coupler from the lower
cap.
2. Remove the two (2) socket cap screws from the lower cap.
3. Remove the lower cap from the machined body.
4. Remove the six (6) socket cap screws from the end plate.
Separate the end plate from the machined body.
5. Remove the cotter pin from the plunger. Unscrew the
plunger from the air cylinder shaft.
6. Remove the four (4) socket cap screws holding the air
cylinder to the end plate.
Servicing and Reassembling Lower Valves
1. Clamp the air cylinder in a vise and unscrew the end cap.
Using parts from the valve service kit, replace the seals in
the air cylinder. Screw the end cap back on.
2. Secure the air cylinder to the end plate using the four (4)
socket cap screws.
3. Screw the two (2) plunger support disks and a new plunger
on the air cylinder shaft.
4. Thread the locknut back on the air cylinder shaft.