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the seat onto the end cover with the O-ring
towards the end cover i.e. the conical face
uppermost.
Position the 2 screw holes in the valve seat
over the corresponding threaded holes in the
end cover.
ATTENTION
Ensure that the X marked on the side of the seat
is aligned with the X on the end cover.
•
Place the diaphragm onto the seat.
•
Pumps fitted with Viton or PTFE pump head
elastomers
use a
elastomer diaphragm. Ensure that the PTFE
side is face down i.e. PTFE face is in contact
with the valve seat.
•
Hold the housing (133) upside down and slide
the piston/guide pin assembly into the
housing, guide pins first. Place a finger into
the thread end of the housing and hold the
guide pin by pushing on its side. Turn the
housing over so that the widest end is
lowermost.
•
Place the housing / piston / guide pin
assembly over the diaphragm / valve seat /
end cover assembly such that the 2 holes
align with the holes in the diaphragm.
•
Push the 2 screws (136) through the holes in
the housing so that they locate into the
threaded holes in the end cover.
•
Tighten the screws enough to hold the
assembly together. (8Nm)
•
Fit the spring and adjusting screw and tighten
the screw until it contacts the spring.
•
Tighten the 2 retaining screws (136) to a
torque of 15Nm.
•
The valve is now assembled and can be re-
fitted to the pump.
ATTENTION
Ensure that the 'Direction of Flow' arrow is in the
previously noted position.
•
Reset the valve to the correct pressure (See
3.13 END COVER RELIEF VALVE).
6.10 THERMAL JACKET – END
COVER
Refer to chapter 8 EXPLODED DIAGRAMS
Ensure that the liquid feed to the jacket is
switched off before attempting to service it.
PTFE
faced
perfluor-
•
Dismantle the jacket (144) from the cover
(143) by removing the screw (147) from the
centre of the jacket
•
Remove the inner O-ring (146) from the
groove around the screw and the outer O-ring
(145) from the groove around the outside
edge of the jacket.
•
Replace the O-rings and re-fit the jacket.
•
Tighten the screws to a torque of 15Nm.
6.11 THERMAL JACKET – PUMP
HEAD
Refer to chapter 8 EXPLODED DIAGRAMS
Ensure that the liquid feed to the jackets is
switched off before attempting to service them.
•
Dismantle the two jackets (139) from the end
cover (138) by removing the screws (141).
•
Remove the O-rings (140) from their grooves.
•
Replace the O-rings and re-fit the jackets.
•
Tighten the screws to a torque of 15Nm.
6.12 Bearing housing - inspection
& repair
Power input to the pump is via the drive shaft
(24). The gearbox has two contra-rotating shafts
(24 & 25), supported by taper roller bearings (4 &
5). The shafts are synchronized by a pair of
precision cut gears (6) that distribute power
between the drive shaft (24) and driven (lay)
shafts (25).
HP and LH pump gearboxes have been designed
for easy inspection and maintenance.
Inspection:
Bearing housing (1) and gearbox internals can be
inspected by removal of the gear cover (11).
•
Disconnect the pump from the drive and
remove the shaft coupling.
•
Drain the lubricating oil from the pump
gearbox via the drain plug (14).
•
Remove two gear cover securing screws (18)
and plastic sealing washers (19).
•
Remove the drive shaft key (29) and gear
cover (11), taking care not to damage the
drive shaft oil seal on the drive shaft key-way.
33
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