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CROSBY SERIES HE ISOFLEX
INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
9 VALVE ASSEMBLY
Assembly of valve
(retaining spring compression)
See section 'Assembly of valve (retaining spring
compression)'.
Assembly of valve
(without retaining spring compression)
NOTE
All lubrication points discussed in this section are
shown in Figures 3, 4 and 5.
Lubricate and thread the disc holder retaining
nut (7) onto spindle (12). With the retaining nut
in its highest position, install the disc holder
(6) over lower end of the spindle. Lubricate the
insert bearing surface and insert threads and
thread the disc insert (5) onto the end of the
spindle until it drops off the bottom thread and
rotates freely on the insert bearing surface.
CAUTION
Care should be used in the assembly operation to
insure against disc insert and nozzle seat damage.
To establish clearance between the disc holder
and retaining nut refer to Figure 5.
Install eductor (9) by lifting the eductor over
the spindle assembly (12) and lowering it into
position on the disc holder (6). The guide ring
(10) may be now screwed onto the eductor.
CAUTION
The guide ring can be threaded too high onto
the eductor. If this happens, when the valve is
assembled the disc holder will load on the guide
ring lip before the insert can come into contact
with the seat.
To avoid this, the guide ring should be positioned
so that the holes in the guide ring are just
below the threads on the eductor. No threads
should be visible through these holes. Stand the
assembly on the guide ring face, with spindle
vertical, on a clean work surface.
Lubricate and install the thrust bearing (25)
and bearing adapter (24) for the top spring
washer and lubricate the bottom spring washer
(21). Place the spring and washer assembly in
position within the bonnet.
Install the adjusting bolt lock nut (27) onto
adjusting bolt (26) by screwing it all the way to
the top. Lubricate the entire threaded portion
of the adjusting bolt and the bonnet threads
carefully and screw the adjusting bolt part way
into the bonnet.
Using a suitable lifting device, (hoist, chain fall,
etc.) lift the spring/ washer and bonnet assembly
up over the spindle assembly and lower carefully
into place.
SELF-ACTUATED SAFETY VALVES
®
Lubricate and install nozzle ring (3) onto nozzle
(1B) making sure the nozzle ring is above
the nozzle seating surface (approximately
inch (1.59 mm)). (If new nozzle ring or set
1
/
16
screw is used, refer to section 'Assembly of
valve (retaining spring compression)' for set
screw fit).
Using an eyebolt threaded onto the spindle
and a suitable lifting device, lift the assembled
superstructure.
CAUTION
With the superstructure lifted and the spindle in
the vertical position, inspect the eductor to bonnet
fit. Be sure eductor is fully seated in the bonnet.
Lower the superstructure slowly, align the
eductor carefully with the body bowl.
IMPORTANT
Do not permit any rocking motion of the spindle
or of any parts while lowering the superstructure
into the body. Any rocking motion could damage
seats.
Lubricate and install bonnet nuts (19) on bonnet
studs (18) and tighten uniformly.
After bonnet nuts have been tightened, lift the
spindle approximately ¼ inch (6.35 mm) to
free nozzle ring. With the spindle in the lifted
position, place a screwdriver in the nozzle ring
set screw hole and turn the nozzle ring to the
left (clockwise) until the top edge of the nozzle
ring is below the nozzle seating surface.
The location can be checked by looking through
the adjusting ring set screw hole while shining
a light through the nozzle ring set screw hole.
Lower the spindle assembly slowly until it
bottoms. The nozzle and disc insert seating
surfaces are now in intimate contact.
IMPORTANT
Lift the spindle up and down gently to make
sure that the spindle and insert threads are not
engaged.
14
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