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R. 09/20  855 867

 SAMOA Industrial, S.A. · Pol. Ind. Porceyo,  I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com

2020_09_24-12:30

EN

1. Close fluid valves.
2. Drain the fluid from inside the pump. Anticipate a drainage of fluid from 

inside the pump.

3. Loosen the screws to remove the directional valve. Take special care with 

the seals.

4. Remove the valve cover by loosening the screws with an Allen wrench. 

Take note of the orientation of the cap, as it is critical to replace it correctly 
during reassembly.

5. Install a new set of valves according to these assembly drawings. Ensure 

that the ball guides are assembled as shown in the figure on the left, and 
tighten the screws with a maximum torque (see “Exploded parts and 
spare parts of the pump” section).

6. Assemble the directional valve with being careful not to damage the 

O-rings and tighten the screws with a maximum torque of 44.25 lbf·in 
(5 N·m).

ATTENTION:  To avoid fluid restriction and leakages, follow the 
position of the ball checks guides in the figure above.

REPAIR AND MAINTENANCE PROCEDURES

BALL VALVES REPLACEMENT

AIR SENSOR (ONLY FOR MODELS WITH AIR VALVE)

The air sensors are on the inside part of the diaphragm covers. To access them, follow the procedure for “Replacing diaphragms”. 
Once removed the covers following procedure:
1. Remove the two screws that secure the air sensor to the top.
2. Remove all components of the sensor. Clean the area.
3. Introduce new components in the order shown.
4. Fit the cover on the pump and tighten the screws to the body of the pump. Maximum tightening torque (see torque indicated in the section “Exploded 

parts and spare parts of the pump”).

5. Fit the remaining components in reverse order.

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DF

DC

Summary of Contents for DF50

Page 1: ...ial S A Pol Ind Porceyo I 14 Camino del Font n 831 33392 Gij n Spain Tel 34 985 381 488 www samoaindustrial com Parts and technical service guide Part No DF50 552 051 1 2 DOUBLE DIAPHRAGM PUMP DF50 50...

Page 2: ...m 105 mm 122 mm 8 mm 146 mm 140 mm 70 mm 1 2 BSP NPT 148 mm 3 8 BSP NPSM Nl min SCFM 200 250 350 300 400 150 100 50 0 bar psi 1 14 5 2 29 3 43 5 4 58 5 72 5 6 87 7 8 100 126 0 0 0 2 64 5 28 7 93 10 57...

Page 3: ...pills For pumps handling hazardous fluids that are a danger to humans or to the environment install a suitable container surrounding the pump to prevent any leaks or spills Ensure that the operators o...

Page 4: ...with viscous fluids Not recommended for hazardous fluids SELF PRIMING Pump is designed to generate vacuum It is possible to evacuate all the air from a hose or pipe without damaging the pump Maximum s...

Page 5: ...s possible to the pump unit The use of a coupler to connect the hoses aids future operation and maintenance tasks Close the inlet valve of the pump Open the air valve of the pump turn on the pump and...

Page 6: ...phragm and place the new one in the proper position 7 Mount the side covers again following the tightening sequence and torque indicated in the Exploded parts and spare parts of the pump section Remov...

Page 7: ...of the pump section 6 Assemble the directional valve with being careful not to damage the O rings and tighten the screws with a maximum torque of 44 25 lbf in 5 N m ATTENTION To avoid fluid restricti...

Page 8: ...d 5 32 DIAPHRAGM COVERS Diaphragm and central pushing rod Flanged hex head screw M6 Socket wrench Metric 10 mm Further maintenance Air Sensors will require an Allen wrench Metric 3 mm METALLIC PUMPS O...

Page 9: ...side Cavitation occurs Adjust air supply pressure and discharge pressure and reduce the suction Vibrations Adjust air supply pressure and discharge pressure Reduce the flow of the inlet valve to adjus...

Page 10: ...10 855 867 R 09 20 SAMOA Industrial S A Pol Ind Porceyo I 14 Camino del Font n 831 33392 Gij n Spain Tel 34 985 381 488 www samoaindustrial com 2020_09_24 12 30 EN NOTES...

Page 11: ...11 R 09 20 855 867 SAMOA Industrial S A Pol Ind Porceyo I 14 Camino del Font n 831 33392 Gij n Spain Tel 34 985 381 488 www samoaindustrial com 2020_09_24 12 30 EN NOTES...

Page 12: ...A Pol Ind Porceyo I 14 Camino del Font n 831 33392 Gij n Spain declares that this product DF50 552 051 conforms with the EU Directive 2006 42 EC EN For SAMOA INDUSTRIAL S A Pedro E Prallong lvarez Pr...

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