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Idiomas disponibles
Idiomas disponibles
TEFEN
TEFEN Advanced Plastic Solutions.
Installation of the injector on a bypass line
It is necessary to fit the proportional dosing injector to a bypass line when irrigation with a flow
rate higher than the maximum recommended for the injector. The bypass enables only part of the
water flow to pass through the bypass and activate the injector, while the reminder passes through
the main line. Using the choke valve (7) on the main line, the flow of water passing through the
main is regulated so that the rest of the flow passes through the bypass and activates the injector.
The metering must be calculated in accordance with the flow rate passing through both lines.
It is necessary to fit a main valve (1) at the beginning of the line and after it a backflow
prevention valve (3), pressure reducer (4), a water filter (2) of at least 120 mesh (130 micron)
, a T connection (A) for diversion from the main line to the bypass, a valve on the bypass before
the inlet to the proportioning dosing injector, a valve after the outlet from the injector (9) on the
bypass and a T-connector for the return to the main line (B). A choke valve, preferably an angled
valve, should be fitted on the main line between the bypass. An anti vacuum valve (8) should be
fitted together with valves for the branch lines after the return connection from the bypass.
Installation of two injectors in parallel
When the water flow rate in the irrigation line is higher than the maximum nominal flow rate of the
injector, the water may be divided between two injectors. If the 2 injectors are used for pumping the
same type of fertilizer, the scale should be adjusted in an identical manner to the same level of
metering. Two different additives may be metered at different levels. The metering in each unit must
be calculated separately for each flow rate passing through each of the two injectors.
It is necessary to fit a main valve (1) at the beginning of the water line and after it, a backflow
prevention valve (3), a pressure reducer (4), a filter (2) with at least 120 mash (130 micron). a T-
junction (5) is then fitted from the main line into 2 lines. To each of these lines are fitted a regulation
valve (6), the injector and non-return valve (7) immediately after the injector and a connection back
to the main line (8). Care must be taken to ensure that both branches are exactly the same length.
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