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Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P
8.5 Connecting a leakage drain
Neptune dosing pumps are produced to the highest of quality standards
with a long service life. However, some parts are subject to operational
wear. This is the case particularly with the diaphragms that are continu-
ously subjected to forces during the suction and discharge strokes and to
the effects of the dosing medium.
If a diaphragm ruptures, the dosing medium starts to leak. This leakage is
drained via the leakage opening. On the flange of the dosing head, there
are three openings for this purpose. Depending on the alignment of the
dosing pump, the leakage is drained via the downward opening.
Fig. 17: Openings of the leakage drain
Damage to drives due to effervescent media
If a hose is connected to the leakage drain and it is routed back into
the dosing tank, effervescent media can enter the drive and damage
it.
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Collect the leakage in a collecting pan.
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As an alternative, you can route the leakage back to to the dosing
tank using a funnel. You should install the funnel at an adequate
distance from the leakage opening.
Subject to technical changes.
NOTE
8.6 Connecting the dosing head venting facility
The dosing heads of the NXP-M/P 68, 140, 285 have an integrated dosing
head venting unit (except for dosing heads made of stainless steel).
For the procedure when venting, refer to chapter 11.1.1 "Venting the
dosing pump" on page 30.
Fig. 18: Dosing head venting facility with hose connection
Perform the following working steps:
1. Connect a 4/6 hose to the dosing head venting facility.
2. Route the other end of the hose into the dosing tank or a collecting
tank.
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Dosing head venting facility connected.
8.7 Hydraulic accessories
The following chapter is intended to give you an overview of installation
options.
Please note that these operating instructions are no substitute for the
instructions supplied with the accessories in each case. The correspond-
ing documentation supplied with the product applies to safety informa-
tion and provides exact instructions on assembly.
8.7.1 Injection nozzle
If the pressure line enters a main line, it is advisable to install an injection
nozzle.
Injection nozzles have three main functions:
Dosing the medium into a main line,
n
Preventing flowback into the pressure line through a non-return valve.
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Notes on assembly:
Double-ball injection nozzles must be installed into the main line
n
vertically from the bottom. You can install hose and spring-loaded
injection nozzles any way you like.
With dosing media that tend to crystallize, it is advisable to carry out
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installation into the main line from the bottom. This prevents air
bubbles from being trapped.
Many dosing media tend to contaminate the injection nozzles, which
n
can lead to blockages. In cases like this, it is advisable to install an
injection nozzle that is easy to dismantle and block off.
Operating instructions
Hydraulic installations
21
Hydraulic accessories
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