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CROSBY SERIES HE ISOFLEX
INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
Valve disassembly
• Removal of the lifting gear
Remove the forked lever pin (34), forked lever
(33), cap (28), spindle nut cotter and spindle nut
(15).
• Recording of ring settings
Remove the nozzle ring set screw. Check the
setting of the nozzle ring by turning it to the
right (counterclockwise) counting the number
of notches turned until it makes contact with
the disc holder. Record the number of notches.
This location is given a minimum (-) (down)
notches from this contact position.
The guide ring should be turned to the right
(counterclockwise) until it makes contact with
the disc holder and raises the disc holder into
contact against the retaining nut. The guide
ring position is recorded as (-) (down) notches
from this contact position.
Disassembly (retaining spring compression)
If the valve is to be reconditioned without
retesting, the original set pressure can be
retained by use of a jacking device as shown in
Figure 7. This device is a service tool that can
be obtained from Pentair (see page 15).
1. Measure from the bottom face of the bottom
spring washer to the bonnet flange top face
and record the dimension. Cut three pieces
of bar stock (1 inch [25.40 mm] diameter
minimum), ⅛ inch (3.18 mm) longer than
the recorded dimension.
2. Install the bonnet spacer (5) on the bonnet
(17). Position the jacking device assembly by
lifting it over the spindle (12) and lowering
down onto the bonnet spacer (5).
CAUTION
The piston (2) should be seated within the housing
(1) before continuing. This seated piston is
reached when the first notch on the piston (2) is
level with or below the top of the housing (1) as
indicated in Figure 3.
3. Lubricate the spindle threads with Never-
Seez, Dry Film Lubricant 321, or equivalent.
Thread the spindle adapter onto the spindle
turning it until it comes into contact with the
jacking device assembly.
4. Attach the hand operated hydraulic pump (7)
and hose (8).
5. To raise the valve spindle, pressure is
applied to the jacking device assembly
with the hand operated hydraulic pump.
This activates the piston (2) which raises
the lower spring washer, compressing the
spring.
SELF-ACTUATED SAFETY VALVES
®
CAUTION
This device has a limited piston stroke that should
not be exceeded. If the piston stroke is exceeded,
the second notch on the piston (2) will be above
the top of the housing (1) and the hydraulic fluid
will flow from the bleed hole, located in the
housing. If hydraulic fluid is flowing from the bleed
hole, but the piston stroke has not been exceeded,
the O-rings (3 and 3A) and the backup rings (4 and
4A) should be inspected for wear or damage and
replaced if necessary.
6. After the spring load has been taken up and
the valve has been jacked approximately
⅛ inch (3.18 mm), place the three
spacer blocks provided in step 1 of this
section, under the lower spring washer
(see Figure 2B).
7. The jacking device can now be removed
by releasing the pressure in the hydraulic
pump. Remove the spindle adapter, jacking
device and bonnet spacer.
8. Referring to Figure 1, loosen and remove
the bonnet stud nuts (19).
9. Using an eyebolt threaded onto the
spindle and a suitable lifting device, lift
the superstructure carefully straight up and
out of the body.
CAUTION
Do not permit any rocking motion of the spindle
or of any parts while lifting the superstructure out
of the body. Any rocking motion could damage the
seats.
10. Lay the superstructure down so that
the spindle is in the horizontal position.
Care must be exercised to prevent the
parts from being damaged while laying
the superstructure down.
11. Remove the eyebolt from the spindle and
slide the internals (disc holder, insert,
eductor, guide ring and spindle) carefully
out of the spring and bonnet assembly.
10
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