General Pump MW Owners Manual - Manual (Page 14)

GENERAL PUMP
A member of the Interpump Group
MW/S SERIES
Page 14
9.6 Suction Line
For the pump’s correct operation, the suction line must have the following characteristics:
1. Minimum internal diameter as indicated in the diagram in paragraph 9.9, and in any case equal or greater than
the pump head’s value. Along the duct, avoid localized diameter reductions that may cause pressure drops with
subsequent cavitation. Absolutely avoid 90 0 elbows, connections with other hoses, bottlenecks, counter-slopes,
upside down “U” shaped curves, “T” connections.
2. With a layout that is set in such a way to prevent cavitation.
3. It should be perfectly airtight, and built in a way that guarantees perfect sealing over time.
4. Avoid pump emptying when stopping (even partial emptying).
5. Do not use hydraulic fittings, 3 or 4 way fittings, adapters, etc., since they may hinder the pump’s performance.
6. Do not install Venturi tubes or injectors for detergent intake.
7. Avoid the use of standing valves, check valves, or any other type of one-way valves.
8. Do not connect the by-pass line from the valve directly to the pump suction line.
9. Provide appropriate baffle plates inside the tank in order to avoid water flows coming from both the by-pass and
feeding which lines may create turbulance near the tank’s outlet port.
10. Make sure that the suction line is perfectly clean inside before connecting it to the pump.
11. The pressure gauge for checking booster pressure must be installed near the plunger pump’s inlet port, and always
downstream from the filters.
9.7 Filtering
On the suction line, install two filters as indicated in fig. 7 and fig. 7/a.
With the manual adjustment valve:
Ref 300790 Rev.D
11-12