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6
NOZ-CHEK
®Cryogenic
Installation, Operation & Maintenance
5.5 VALVE ASSEMBLY
Assemble all components in reverse order to 5.3.
Lubricate generously with suitable ‘Anti Seize’ compound
covering all threaded diameters in both body and seat.
For standard designs: Ensure that the ‘Anti Seize’
compound is applied around the O-ring in the seat, and
on the mating body diameter.
For alternative seat designs: Ensure that none of the ‘Anti
Seize’ compound is applied around the seal area or on the
seal itself. The sealing compound can affect the sealing
capability at extreme temperatures.
When replacing the guide housing ensure an adequate
amount of Furminite (or other suitable locking
compound/thread seal) is applied to help lock the guide
housing in place.
After assembly of valve, the valve should be
hydrostatically tested by pressurising the valve on the
downstream side and checking for leakage on the
upstream side.
Note:
1. Locktite 222 to be used to secure all screws.
2. Item 11 Back up ring is only required for standard
design valves, PN100 and above. (See figure 1)
5.5.1 PROXIMITY SWITCH ASSEMBLY (WHERE
APPLICABLE)
(g) Switch housing assembly (See Figure 3B)
1. The threads in the body (1) for the switch housing
(20) and the threads on the switch housing (20)
should be cleaned thoroughly with petroleum
solvent, or other suitable detergent.
2. An even coating of “Jet-Lube” (Thick or Thin) thread
paste is applied to the switch housing (20) threads.
3. Screw the switch housing (20) into the body (1) and
wrench tighten. (Care must be taken not to start
screwing the switch housing in on the incorrect
thread as this will damage the threads)
4. The limit switch (21) is inserted fully into the switch
housing, and followed by the switch spacer (27).
5. The cable of the limit switch (21) should be passed
through the cable gland (22) and the cable gland
screwed into the switch housing (20).
(b) Magnet housing assembly (See Figure 4)
1. The 2 magnets (24) are joined together, opposite
pole to opposite pole and inserted into the magnet
housing (25) (the switch’s sensor detects the
presence of a magnetic field, there is no preference
in the polarity of the field, therefore the magnet can
be inserted into the housing either pole first). Ensure
the magnets (24) are positioned in the centre of the
magnet housing (25) and secured in place with an
anti-vibration sealant (or silicone), such as Belzona
2221 Anti-Shock Compound.
2. The magnet spacer (23) is placed in the magnet
housing (25) on top of the magnets (24) so the holes
in the spacer and housing are aligned.
3. Insert the magnet housing assembly into the hole in
the disc (3) so the hole in the magnet housing (25)
and the hole in the disc line up. Secure in place with
an anti-vibration sealant (or silicone).
4. An even coating of “Jet-Lube” (Thick or Thin) thread
paste is applied to the grub screw (26), which is
screwed into the hole in the back of the disc (3) and
tightened to secure the magnet housing (25) into the
disc (3).
A small portion of the magnet housing (25) will
protrude from the hole when fully inserted. This
portion should not impede the axial motion of the
disc (3) by colliding with the switch housing (20).
5.6 PROXIMITY SWITCH DISASSEMBLY
The disassembly of the Proximity Switch can be
accomplished by simply reversing the assembly
instructions in 5.5.1.
ALL THREADS MUST BE CORRECTLY TIGHTENED AND
LOCKED.
DO NOT USE EXCESSIVE FORCE AT ANY POINT DURING
ASSEMBLY.
IF IN DOUBT DIS-ASSEMBLE AND CHECK BEFORE RE-
ASSEMBLY.
REMEMBER: PLEASE USE EYE PROTECTION.
CAUTION
!