Flotronic F 500 series, Инструкция по установке, эксплуатации и обслуживанию

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Section 10 - Servicing & Diaphragm Fitting Instructions
All “One Nut” fast maintenance FPL pumps have a common construction through the horizontal centre
line of the pump, with the single nut being a device which holds the air system, diaphragms and thrust
tube assembly together, via the tie rod. The following operations apply to all pumps except those fitted
with guardian or alarm systems, see Section 6 & Section 18.
IMPORTANT NOTICE
Air supply to the pump must be isolated before any maintenance is commenced.
Please remember that process liquid will be inside the pump body and manifolds and maybe under
pressure. It is important that maintenance personnel are wearing suitable protective clothing at all times.
When the pump is to be dismantled, access to diaphragms can be made with the pumps installed in
rigid pipe-work or can be carried out on the bench.
To obtain access to the diaphragms, it is necessary to remove the centre tie rod which carries the 5 port
air system and the air dome. This is carried out by first unscrewing the nut at the end of the tie rod and,
if necessary, restraining rotation of the air valve. The rectangle steel base to which the air valve is
attached must be used to counter the rotation of the spanner, and under no circumstances should the
5 port air valve be held in a vice or used as a means for preventing rotation.
Having released the large nut and adjacent washer or washers, the air dome at the nut end is free to
be removed, and this should be carefully done to avoid damage to the rubber ‘O’ ring seal inside the
air dome. The tie rod air block & air valve assembly can now be withdrawn from the opposite end.
The diaphragms are now exposed and, by gripping the edges of the diaphragms with fingers, (not sharp
edge tools) they can be prised away from the body of the pump to obtain a grasp on each diaphragm.
Diaphragm Fitting Instructions
(Read note re: Divider Seal top of page 17)
Rotate the diaphragms in an anti-clockwise direction to each other, to unscrew from the centre connecting
tube. If only one detaches from the centre tube, the tube may then be withdrawn from the pump body and
placed in a bench vice using soft jaws to aid release of the second diaphragm.
New diaphragms can be fitted using reverse procedure and in accordance with the diaphragm fitting
instructions (see sketch on next page). Always replace both diaphragms when servicing pumps.
Refitting new diaphragms should be carried out using the following procedures:
1. ensure that the centre thrust tube thread and angular seal faces are cleaned and free from dirt.
2. lightly grease thread unless used in sanitary environments.
3. screw on the first diaphragm using bench vice with soft jaws if necessary with PTFE face inwards
towards the thrust tube, as tightly as possible. Wait five minutes after initially tightening and
then retighten . If nitrile or rubber diaphragms are fitted, the concave face should be towards the
thrust tube.
Servicing & Diaphragm
Fitting Instructions