Filter
Top Products
Conveying System Mechanical Components Chapter 5: Maintenance 86 of 138
Disassembling Upper Valves
1. Remove the two (2) socket cap screws from the upper cap, and remove the upper cap.
2. Remove the six (6) socket cap screws from the end plate. Separate the end plate and
air cylinder from the machined body.
3. Remove the cotter pin from the plunger. Unscrew the plunger from the air cylinder
shaft.
4. 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. Screw the end cap back on.
2. Secure the air cylinder to the end plate using the four (4) socket cap screws.
3. Screw a new plunger on the air cylinder shaft; secure it with the cotter pin.
4. Place a new gasket on the end plate; secure the end plate.
5. Reattach the upper cap to the air cylinder using two (2) socket cap screws.
Reinstalling Upper Valves
1. Replace the O-rings in the machined body.
2. Position the valve on the blower inlet, making sure the valve seats properly. Tighten
the set screws that secure the valve to the blower inlet.
3. Reconnect the valve inlet to the incoming vacuum line and the lower valve with the
hose. Tighten the clamps.
4. Reconnect the compressed air line to the vacuum relief regulator.
Maintaining Lower Valves - 5 to 15 HP (3.73-11.19 kW) SPDB Units
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. On units with optional sound enclosures, loosen the hose clamps between the
discharge silencer and the U-bend.
4. Remove the screws holding the discharge silencer to the base of the vacuum power
unit, and take off the discharge silencer. On units with optional sound enclosures,
remove the screws securing the U-bend to the base, and pull the silencer out of the
body of the lower valve.
5. Loosen the set screws holding the lower valve to the blower outlet, and remove the
valve from the power unit.