Operation & Maintenance Instruction
• To prevent receiving electrical shock when
performing electrical test, hands must be clear of
electrical components, contacts and housing and
the required "in-lab" grounding procedures must
be
strictly adhered
to.
A wooden
work
bench
should
be used.
Failure
to heed this
WARNING could
result
in severe injury or death.
• An adequate support or lifting device must be
available to support the Device and/or Valve
Portion(s) during removal, installation and
maintenance procedures.
6.0
CLEANING
SOLVENT,
LUBRICANT, SEALANT
AND
SPECIAL
TOOLS
6.1.1 The
solvent
used to
clean
the
reusable
parts of the VX
Vent Valve Portion
MUST BE
an aliphatic hydrocarbon
solvent,
such as mineral spirits or naptha, that will dissolve oil or
grease and that will permit the parts to be cleaned without
abrasion.
IMPORTANT: Cleaning solvents are to be used in a well
ventilated
area.
6.2 LUBRICANTS
6.2.1 Number 2 Silicone Grease, Wabtec Corporation
Specification
M-7680-2,
(Industry Designation
MIL-G-4343),
such as Dow Corning Corporation Dow Corning 55,
is required
for the
lubrication
of specified o-rings, o-ring grooves
and
the
o-ring bearing surfaces of the bushing(s) which will be in
contact with the o-rings.
6.2.2
A
compound consisting
of
one part
of graphite, Wabtec
Corporation
Specification M-7695-2, (AAR Specification M-
913), such as Super Flake Graphite Company - Superfine
Number 597 Joseph Dixon Crucible Company - Microfyne
Graphite or National Carbon Company Number 38 or 39
Graphite, and two parts of SAE-20 oil by weight is required
for
the lubrication
of
the threads
of
the cleaned
or
NEW
piston
choke plug prior to the installation of this choke plug in the
piston.
6.3.1
Locking Sealant,
Wabtec
Corporation Specification
M-
7499-05,
such as Loctite
Corporation
TL-242, is
required
for
application to the threads of the piston stem prior to the
installation of the piston jam nut.
7.0
MAINTENANCE
PROCEDURES
NOTE: When performing the procedures which
follow,
DO
NOT use hard or sharp tools to remove o-rings, gaskets,
seals or the diaphragms. Exercise care so that no damage
is done to
reusable
parts.
WARNING; When
performing
the
procedures
which
follow, springs within the assembly may be placed
under compression. Exercise care so that no parts are
inadvertently expelled. Inadvertently expelled parts
may cause bodily injury and/or damage to parts.
7.1 DISASSEMBLY
NOTE: The VX Vent Valve Portion
weighs approximately
7
pounds.
7.1.1 If the mounting gasket is still in its groove in the
mounting face of the body (2), it is to be removed and
SCRAPPED. The
gasket IS
NOT a part of the
VX Vent
Valve
Portion and is not illustrated.
7.1.2
Remove
and
SCRAP
the wire mesh strainer (3) from
its port in the body (2).
7.1.3 Remove the four
3
/8" x 1
1
/2" hex. head cap screws (1)
which
secure the
housing
(19),
filling
piece (9), and
body
(2)
together.
7.1.4
Carefully
remove the
body
(2) from the
filling piece
(9),
then remove the
filling
piece with
diaphragm
and diaphragm
clamping plate subassembly (5, 6, 7, 9) from the housing
(19) as a unit.
7.1.4.1
Remove
the spring (8).
7.1.5 Remove the three #8 x
1
/2" button head screws (5)
which secure the
diaphragm
clamping plate (6), diaphragm
(7) and
filling
piece (9) together.
7.1.6 Remove the diaphragm clamping plate (6) and
diaphragm (7) from the filling piece (9). SCRAP the
diaphragm
(7).
7.1.7
Remove
and
SCRAP
the 5
1
/4" O.D. o-ring (4) from its
groove in the
filling
piece (9).
7.1.13 Remove the piston-diaphragm sub-assembly (13,
14, 15) as a unit from the piston stem (17) and diaphragm
follower
(16).
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