Emerson CROSBY HE ISOFLEX Series Installation, Maintenance And Adjustment Instructions page 6

CROSBY SERIES HE ISOFLEX
INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
• Initial field assembly procedures
NOTE
It is recommended that upon completion of all
hydrostatic tests on new installations, a Crosby service
technician be present for assembly of the safety valves
(see page 14).
The following instructions should be followed:
CAUTION
Check the valve identification numbers and match
the proper superstructure to each valve body.
Figure 4 shows the location of valve identification
numbers.
- The valve superstructure assembly is
illustrated in Figure 2 and consists of the
bonnet, adjusting bolt, spring subassembly,
spindle, eductor, disc holder, guide ring and
disc insert, all of which are shipped as an
assembly. The nozzle ring and set screws are
packaged together in a box and delivered with
the superstructure. The contents of the box
are marked for identification.
CAUTION
Each valve superstructure nozzle ring and set screw
is identified and matched to a specific valve body by
a tag number and should be assembled accordingly.
- Although all parts have been inspected
thoroughly, cleaned, lubricated and protected
for shipment, the parts should be inspected
for evidence of foreign matter or damage
prior to installation. Special attention should
be given to the seating surface, disc insert (5)
and nozzle (1B). These seats should be free
from surface damage. If cleaning and/or
repair is necessary, refer to section 'Repair
procedures'.
• Assembly of valve (spring compression retained)
Lubricate and install nozzle ring (3) onto nozzle
(1B). Leave the top of the nozzle ring level with
the nozzle seat.
Install the nozzle ring set screw into the base
and verify the fit and notch engagement. The tip
of the nozzle ring set screw should not touch
the nozzle ring. The nozzle ring should be free
to move side to side with approximately
(.794 mm) clearance with set screw.
After the correct nozzle ring to set screw fit is
obtained, remove the set screw and raise the
nozzle ring inch (1.59 mm) above the nozzle
/
1
16
seating surface.
SELF-ACTUATED SAFETY VALVES
®
CAUTION
(Prior to installing superstructure) It is possible to
thread the adjusting ring too high onto the eductor
(9). If this happens when the valve is assembled,
the disc holder (6) will load on the guide ring (10)
lip before the disc insert (5) can come into contact
with the nozzle seat. To avoid this, the adjusting
ring should be positioned on the eductor so that
the holes in the adjusting rings are just below the
threads of the eductor - see Figure 5. No threads
should be visible through these adjusting ring
holes.
Remove the forked lever pin (34), forked lever
(33) and cap (28).
With the superstructure lifted and the spindle
in the vertical position, inspect the eductor
to bonnet fit. Position the superstructure so
that the valve identification number stamped
on the bonnet is opposite the valve outlet
(see Figure 4).
Lower the superstructure slowly, carefully
align the eductor with the body bowl.
IMPORTANT
Do not permit any rocking motion of the spindle or
any part while lowering the superstructure into the
body. Any rocking motion could damage seats.
Install the bonnet stud nuts (19) on the bonnet
studs (18) and tighten uniformly.
After the bonnet nuts have been tightened, lift
up the spindle approximately ¼ inch (6.35 mm).
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 in 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.
IMPORTANT
Lift the spindle up and down gently to make
sure that the spindle and insert threads are not
engaged.
inch
/
1
32
Valve
identification
number
Guide ring
set screw
hole
Nozzle ring
set screw hole
* Lubrication points
FIGURE 4 - Lubrication and assembly
Installed
spacer
blocks
Fit should be
checked prior to
lowering super-
structure into
body
No threads should
be visible through
these holes
Nozzle
ring "
1 /
16
(1.59 mm)
above
nozzle set
6