4.2.2 Product connections on the lifting vessel
There are three connections (DN20 with G1¼" threads) at the bottom of the lifting vessel .
In case of Connexx Basic, the PVC textile-reinforced hose(19/27 mm)is directly connected
on the vertical inlet and lead to Click & Plug connection coupling.
In case of Connexx Switch, it is split onto two change-over valves and connected to the
respective connection coupling "1" or "2" through the hose.
The front of the two identical 45° elbow connections
Ä
Chapter 4.2 ‘Connections’
on page 15, pos. 11 and 12, is provided as the suction point for the metering pumps(s).
The rear of the two connections can also be used for this if desired.
The rear connection (pos. 12) is sealed by the manufacturer with a dummy insertion part.
It can be used for returning products like an overflow valve of a connected pump or a
circulation pipe for degassing a (short) metering pipe. In this case, the safety instructions
Ä
Chapter 5.2 ‘Protection when using a return connection’ on page 29 must be
observed.
CAUTION!
The lifting vessel is not suitable for pressure overload! Provision must be made
for the product to flow back into the container in order to prevent pressure from
building up in the suction line. The return quantity must not exceed the
available volume in the container
Ä
Chapter 5.2 ‘Protection when using a
return connection’ on page 29!
WARNING!
The delivery capacity of the connected metering pump(s) must be designed to
match the inside diameter (19 mm) and length of the suction line. A total
capacity of 210 l/h is recommended for reciprocating pumps (piston or
diaphragm pumps) running simultaneously.
The pipe length on the suction side of the pump(s) should be designed as short
as possible.
Having said that, there must not be any load on the connection points during
the handling of Click & Plug coupling due to very short pipes.
The position of the container must never be moved when the Click&Plug
coupling is connected.
4.2.3
Compressed air supply and exhaust air connection
A compressed air supply is needed for the injector (
Ä
Chapter 4.2 ‘Connections’
on page 15 , pos. 3 and for actuating the switch-over valves.
A pressure reducer should be used to limit the compressed air to a maximum of 0.6 MPa
(6 bar), since higher pressures will only increase the air consumption of the injector but
not its suction performance. Optimum injector suction performance is obtained when the
flow pressure is 0.4 MPa (4 bar).
A throttle with adjusting screw is attached at the top of the cover
Ä
Chapter
4.2 ‘Connections’ on page 15, Fig. 2for finely adjusting the suction speed. At least 0.35
MPa (3,5 bar) are necessary to ensure that the product is sucked out quickly enough.
Switching over between containers requires a minimum pressure of 0.5 MPa (5 bar) for
the switch-over valves.
Functional description
18Rev. 1-06.2018
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