General Pump VK Owner Manual - Manual (Page 14)

GENERAL PUMP
A member of the Interpump Group
VK SERIES
Page 14
9.7 Filtration
The level of filtration permitted for this series of pumps must be maximum 20 µm (micron). Normally this is obtained by a
battery of at least three filters, positioned as shown in fig. 7.
The filters must be installed as close as possible to the pump. They must be easily accessible for inspection and must
have the following specifications:
1. Minimum flow rates at least 3 times the nominal flow rate of the pump.
2. Inlet/outlet port diameters no smaller than the inlet port diameter of the pump.
3. Filtration degree:
Filter number 1: 250 µm
Filter number 2: 100 µm
Filter number 3: 20 µm
In order to guarantee correct pump operation, it is important to plan periodical cleaning of the filter
depending on actual pump usage, water quality and actual clogging conditions.
To guarantee the supply pressure required (see 9.5) install a pressure regulator.
9.8 Outlet Line
To obtain a correct delivery line, please comply with the following installation instructions:
1. The internal diameter of the pump must allow to guarantee correct fluid speed; see digram in paragraph 9.9
2. The first section of the hose connected to the pump must be flexible in order to isolate pump vibrations
from the rest of the system.
3. Use high pressure hoses and fittings that guarantee wide safety margins in any working condition.
4. Install a safety valve on the delivery line.
5. Use pressure switches suitable for the pulsating loads typical of plunger pumps.
6. In the design phase, take into proper account the pressure drop along the line, since this causes a reduction in
usage pressure with respect to the value measured at the pump.
7. If the pump pulsations are harmful for particular applications, install an appropriately sized pulsation dampener on
the outlet line.
Ref 300837 Rev.B
06-12