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Conveying System Mechanical Components Chapter 5: Maintenance 88 of 138
Maintaining Upper Valves - 25 and 30 HP (18.65-22.38 kW) SPDB Units
(See Valve Assembly Drawings and Spare Parts Lists in Figures 50-51 on Pages 112-113)
Removing Upper 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 compressed air line running to the pressure
relief regulator on the upper valve.
3. Loosen the set screws securing the inlet filter, and remove the filter.
4. Loosen the hose clamps that connect the upper valve to the T-Y tube, and slide the
hose back.
5. Loosen the set screws that secure the valve to the blower inlet.
6. Remove the valve from the power unit.
Disassembling Upper Valves
1. Remove the pipe coupler and the pipe nipple from the valve.
2. Remove the two (2) socket cap screws from the upper cap, and remove the upper cap
from the valve body.
3. Remove the six (6) socket cap screws from the end plate. Separate the end plate from
the valve body.
4. Remove the locknut from the air cylinder shaft.
5. Remove the two (2) plunger support discs and the plunger from the air cylinder shaft.
6. Remove the four (4) socket cap screws holding the air cylinder to the end plate.
Separate the cylinder and the end plate.
Servicing and Reassembling Upper 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, and screw the end cap back on.
2. Fasten the air cylinder to the end plate using the four (4) socket cap screws.
3. Place the plunger support discs and a new plunger on the air cylinder shaft.
4. Thread the locknut back on the air cylinder shaft.
5. Reconnect the end plate to the valve body using six (6) socket cap screws and a new
gasket.
6. Reconnect the upper cap to the air cylinder using two (2) socket cap screws.
7. Reconnect the pipe coupler and pipe nipple to the valve.