Product Connections On The Lifting Vessel; Compressed Air Supply / Exhaust Air Connection - Ecolab CONNEXX Basic Manuel Technique

4.1.2

Product connections on the lifting vessel

The bottom of the lifting vessel is fitted with three DN20 connections with G1¼" threads.
On the Connexx Basic, the vertical inlet is connected directly to the PVC fabric hose (12/27
mm) and run to the Click & Plug coupling. On the Connexx Switch, it is split into two switch-
over valves and connected by a hose to the associated coupling "1" or "2".
The front of the two identical 45° elbow connections (chapter 4.1, items 11 and 12) is
provided as the suction intake for the metering pumps(s). The rear of the two connections
can also be used for this if desired.
The rear connection (item 12) is closed off in the factory with a blanking plug. It can used to
feed the product back from an overflow valve of a connected pump, or for the circulation line
for degassing a (short) metering line. In this case, the safety instructions in chapter
be observed.
The lifting vessel is not suitable for pressures above atmospheric. Provision must be made
for the product to flow back into the container in order to prevent pressure from building
CAUTION
up in the suction line. The return quantity must not exceed the available volume in the
container (see chapter 5.2).
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
simultaneously.
ATTENTION
The hose lengths on suction side of the pump(s) must be designed as short as possible.
On the other hand, when using the Click & Plug coupling the connections should not be
subjected to any stress caused by excessively short hoses.
The position of the container must never be moved when the Click & Plug coupling is
connected.
4.1.3

Compressed air supply / exhaust air connection

A compressed air supply is needed for the injector (see chapter 4.1, item 3) and for
actuating the switch-over valves.
A pressure reducer should be used to limit the compressed air to a maximum of 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 4
bar. A throttle screw (see chapter 4.1, Fig. 4.2) is attached to the top of the cover for finely
adjusting the suction speed.
At least 2 bar are necessary to ensure that the product is sucked out quickly enough.
Switching over between containers requires a minimum pressure of 3.5 bar for the switch-
over valves.
The exhaust air from the injector outlet must be conducted to a safe area, as it will always
contain product vapours. The exhaust air may also contain individual droplets of the product,
which would otherwise be emitted unhindered from the exhaust air connection. The
connection also reduces the noise level.
The exhaust air connection should be at least DN20, depending on its necessary length.
The exhaust air connection from the injector must be run to a safe area in order to prevent
the emission of dangerous vapours and/or liquids.
CAUTION
A long exhaust air line can reduce the suction performance of the injector. We recommend
increasing the nominal diameter to DN25 for lengths over about 20 m.
417101375_Connexx.doc
for reciprocating pumps
- 37 -
(piston or diaphragm
5.2 must
pumps) running
Rev. 11-02.10