Samoa DF250 Serie Guía De Servicio Técnico Y Recambio página 10

EN
REPAIR AND MAINTENANCE PROCEDURES
TORQUES NECESSARY FOR THE PROPER FUNCTIONING OF THE PUMP
For proper operation of the pump and to prevent accidents which may
damage equipment and in the worst case, people, you must periodically
review the torques of the diaphragms covers and the DIRECTIONAL VALVE. In
the next table are shown the appropriate torques for this purpose:
CAUTION!: DO NOT OVERTIGHTEN FASTENERS.
DIAPHRAGM REPLACEMENT
Before any intervention: DISCONNECT AIR SUPPLY OF THE PUMP.
IT IS NOT NECESSARY TO REMOVE THE PUMP FROM THE FLUID LINE.
Tightening sequence
1
10
3
8
6
7
4
2 9
PUSHING ROD
Remove the side cover on the right of the fluid inlet as shown in the figure,
following the procedure to "Replace diaphragms".
Once the shaft is visible, use the following procedures:
1. Remove the shaft from its housing by pulling it from one end.
The Teflon® sleeve is threaded into the body. To remove use
snap ring pliers in the two holes indicated in the figure.
2. Once the cap has been removed, remove the quad ring inside the pump
body.
3. Replace the kit following the correct order shown in the
assembly drawing.Reassemble the pump in reverse order.
10
855 828 R. 09/20
SAMOA Industrial, S.A. · Pol. Ind. Porceyo, I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com
3
5
Diaphragm cover
TORQUES
Directional valve
DF250
Valve cap
1. Close fluid valves.
2. Drain the fluid inside the pump. Anticipate a drainage of fluid from inside
the pump.
3. Remove the directional valve while being careful not to damage the seals
shown in the figure.
4. Remove the diaphragm cap.
NOTE: To tighten these screws you must use a torque wrench calibrated to
(see torque table in this page).
5. Remove the cover by gently pulling back.
6. Remove the used diaphragm and place the new one in the proper position.
Assemble components.
When reassembling the diaphragm lid with its nuts, please follow the torque
sequence as shown in the picture. It is crucial to not use the required torque
values until the diaphragm lid is fully approximated to the central body using
the screws.
6
5
2
2
2
1
1
177 to 260 lbf·in (20 to 30 N·m)
132 lbf·in (15 N·m)
70 lbf·in ( 8 N·m) composite
4