Clean Suction And Pressure Valves - Neptune NSP-M Operating Instructions Manual

Neptune solenoid pump NSP-M
Perform the following working steps:
1. Screw out the four screws (5) on the dosing head using a suitable tool
(SW 3 Allen key) and take off the dosing head (4).
2. Use pliers to bend the edge of the diaphragm (3) slightly upwards and
screw it out counter-clockwise.
ü
Diaphragm removed.
11.3.2 Install a new diaphragm
Damage to the dosing head/diaphragm leaks
If you tighten the screws too much, this can lead to the dosing head
being damaged. However, not tightening the screws enough leads
to the diaphragm being leaky and correct functioning being
affected.
ð
Tighten the screws to a torque of 16 Ibf in.
Precondition for action:
ü
You have thoroughly cleaned the diaphragm rod (2) and the
diaphragm flange (1) so that the new diaphragm is not affected by
dosing medium residues.
ü
The diaphragm (3) thread was lightly greased (e.g. Molycote
Longterm W2).
Perform the following working steps:
1. Screw the diaphragm manually in the clockwise direction until it
safely contacts into the diaphragm rod.
2. Bring the dosing head into position and insert the screws. First
tighten the screws finger-tight. After this, tighten the bolts on the
diagonal, e.g. top left – bottom right – top right – bottom left.
ü Diaphragm change finished.

11.4 Clean suction and pressure valves

Contaminated valves affect the dosing preceision and this means that
you should clean the valves on a regular basis.
With dosing heads made of plastic, when replacing a valve you must
replace the complete dosing head (see chapter 13 "Spare parts" on
page 29).
Maintenance
26
Clean suction and pressure valves
NOTE
Operating instructions