PFD2/PFS2 – OPERATING INSTRUCTIONS
INDEX
DATE
N°
03
26/06/01
DC02020US
7/11
VI.1 – How to dismantle
Before dismantling the pump, 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 are
thoroughly cleaned both on the inside and outside.
See V.2 for the Preventive Maintenance Schedule.
To repair the pump, refer to schedules 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 tools required are a screwdriver to replace the shuttle valve (see VI.3.1) and a strap wrench
to remove body rings (P/N 2742). All other items can be removed and replaced by hand. A tools kit
for the whole maintenance is available (P/N KPFD2), as well as maintenance kits
(P/N AIR PFD2, LIQ PFD2, and MEC PFD2), and a preventive maintenance box (P/N PM PFD2,
PM PFS2, PM PFD2G or PM PFS2G). For more details on these kits, please report to appendix
documents.
VI.3.1 – Replacing the shuttle valve
The valve is easily removed from the outside:
1) Unscrew the 2 fastening screws (P/N 2610),
2) Replace with a new factory assembled shuttle valve (P/N 2701),
3) Carefully tighten the 2 fastening screws.
Do not overtighten,
4) Test with compressed air/nitrogen. Re-tighten if necessary.
VI.3.2 – Replacing the bellows
To replace the bellows proceed as follows:
1) Remove shuttle valve (P/N 2701) (see VI.3.1),
2) Unscrew exhaust silencers (P/N 7185),
3) Unscrew the 4 manifold nuts and remove the 4 ball valves (P/N 6512) – take care not to lose
them,
4) Put aside the 4 manifold O.rings (P/N 2464), except for PFD/S2…
W
pumps: seals (P/N 2587)
must
absolutely
be changed with an air spray gun (PFD/S2…
G
pumps are equipped with
manifolds with no seals),
5) Position the pump into a bench vice (tighten only over the core P/N 2740),
6) Unscrew the body ring (P/N 2742) with a strap wrench while holding the PFA body,
7) Remove the pump body (P/N 2748 or 2748G for PFD/S2…
G
pumps),
8) Now unscrew the bellows (P/N 2760 or 2760S) from the central shaft (P/N 2761),
9) Replace with new bellows – moderately hand tighten,
10) To reassemble follow the above but in reverse order from 8) to 1). For PFD/S2…
W
and
G
pumps, you must
absolutely
change body rings (P/N 2588) before re-assembling. Retighten
manifold nuts simultaneously and progressively with a strap wrench in order to ensure a correct
tightness.
All
TEFLON
®
PTFE and PFA parts are soft; please handle with care to avoid damage.
Do not put
them down on their sealing surfaces.
To re-assemble the PFA bodies, hand tighten the body rings (P/N 2742), and block them up by giving
1/8 further turn with the strap wrench. Check that bodies are well positioned so that manifolds are
tight.
