PFD4/PFS4
– OPERATING INSTRUCTIONS
INDEX
DATE
N°
03
22/04/02
DC04020US
7/8
VI – Dismantling and repair
Attention:
Part numbers quoted in this manual are those used on a “standard” PFD/PFS pump.
Before ordering, please check the spare parts list, the section view of the pump and the part numbers
table (see encl. documents).
VI.1 – How to dismantle
Before dismantling the pump, please refer to the Maintenance schedule V.1, and proceed as follows:
•
Disconnect the air/nitrogen supply,
•
Remove the inlet and outlet connections (beware of any chemical droplets remaining on the
inside),
•
Rinse the outside of the pump in DI water to remove all trace of chemicals,
•
Remove pump support screws.
VI.2 – Examination
To comply with your local Health and Safety Regulations, it is essential the pump and all parts be
thoroughly cleaned both on the inside and the outside.
See V.2 for the Preventive Maintenance Schedule.
To repair the pump, please refer to V.1 and V.2.1.
VI.3 – Stripping and assembling the pump
The SGPPL ASTI design ensures that the pumps are easy to strip and assemble.
The only tool required to repair the pump is a torque wrench (2-20 N.m) to check that the tie rods nuts
(P/N 2490) are fastened. A tools kit for the whole maintenance is available (P/N KPFD4), as well as
maintenance kits (P/N AIR PFD4, LIQ PFD4, and MEC PFD4), and a preventive maintenance box
(P/N PM PFD4, PM PFS4, PM PFD4G or PM PFS4G). For more details on these kits, please report
to appendix documents.
VI.3.1 – Replacing the shuttle valve system
The valve is easily removed from the outside:
1) Unscrew the two PVDF screws (P/N 2478). They are hand tightened, so you do not need any tool,
2) Remove the 2 screws (only a few cm),
3) Remove the shuttle valve,
4) Replace with the new one (P/N 2493, Mark A),
5) Carefully tighten the 2 screws,
6) Test with compressed air/nitrogen. Retighten if necessary.
VI.3.2 – Replacing the bellows
1) Unscrew the 4 nuts (P/N 2607) from the pump support (P/N 2492),
2) Unscrew the 4 manifold nuts.
Be careful not to loose the inlet valves
(P/N 2633),
3) Put aside the 4 manifold nuts (2632S and 2632K, Mark F), except for PFD/S4…
W
pumps: seals
(P/N 2592, Mark F) must
absolutely
be changed (with an air spray gun), and PFD/S4…
G
pumps
that have manifolds with no seals,
4) Unscrew the 16 nuts (P/N 2490) holding the pump bodies,
5) Remove the PFA pump body (P/N 2471 or 2471G, Mark I),
6) Unscrew the bellows (P/N 6530 or 2309S, Mark B) from the central shaft (P/N 2477),
7) Replace with new bellows and hand tighten,
8) To re-assemble, use reverse order of above-mentioned steps (from 4 to 1). For PFD/S4…
W
and
G
pumps, you must
absolutely
change body rings (P/N 2593, Mark C) before re-assembling.
Retighten manifold nuts progressively with a strap wrench.
All
TEFLON
®
PTFE and PFA parts are very soft. Please handle with care to avoid damage.
Do not
put them on their sealing surfaces.
