Operation & Maintenance Instruction
IMPORTANT: The
locking sealant
is to be
applied
according
to the instructions of the
locking sealant manufacturer
.
7.3.10
Install
the
1
/2" jam nut (10) on the
threaded
end of the
piston stem (17) and snug it against the
washer
(11). Using
a
7
/8" open end
wrench
on the flats of the piston stem (17) to
hold the sub-assembly, torque the
1
/2" jam nut (10) to 30 to
35 foot-pounds.
NOTE: The
diaphragm
- piston -
follower
- piston stem sub-
assembly
(10 to 17)
MUST BE
set
aside
to permit the locking
sealant to cure. See locking sealant manufacturer
instructions for proper curing time.
7.3.11 Apply a light coating of Number 2 Silicone Grease,
Wabtec
Corporation
Specification M-7680-2, to the surfaces of
a
NEW
11
/16" O.D. o-ring (18).
Also, fill
the o-ring groove on the
piston stem (17) and lightly lubricate the lower bushing of the
housing
(25), the
bushing which
the o-ring
will
contact, with the
lubricant.
7.3.12
Install
the NEW lubricated
11
/16" O.D. o-ring (18) in
it
s
groove
on the piston
stem (17).
Remove any excess
lubricant by
wiping with a clean, dry, lint-free cloth.
7.3.13 Install the diaphragm - piston - follower- piston stem
sub-assembly (10 to 18) as a unit into the housing (19) so
that the piston stem with o-ring (17, 18) enters the bushing in
the
housing
(19) and the outer bead of the
diaphragm
(15) fits
into the bead groove of the housing (19). Apply finger
pressure
to
seat
the
bead
of the
diaphragm
(15) in its groove.
7.3.14
Install
the
control
spring (8) over the
exposed
threads of
the piston stem (17) so that the spring (8) seats on the top of
the jam nut (10).
7.3.15
Install
a
NEW
diaphragm
(7) in
place
in
the filling
piece (9)
so that the metal spring cup of the diaphragm faces the
filling
piece (9) and the bead of the
diaphragm
(7) enters the bead
groove of the
filling
piece (9).
Apply
finger
pressure
to seat the
bead of the
diaphragm
in its groove.
7.3.16 Place the diaphragm clamping ring (6) over the
diaphragm
(7) and on the
filling
piece (9) being sure that the
three screw holes of the clamping plate (6) are
aligned
with the
tapped holes in the filling piece (9).
7.3.17
Install
three #8 x
1
/2" button head screws (5) through the
aligned holes
of the
diaphragm clamping
ring (6) and the filling
piece (9). Equally tighten the screws to maintain alignment
and secure the sub-assembly. Torque the screws to 20-23
in-lbs.
7.3.18 Install a NEW 5
1
/4" O.D. o-ring (4) into its groove in
the filling piece (9). Apply Number 2 Silicon Grease,
Wabtec Corporation Specification M-7680-2 to the O-ring
and groove.
7.3.19 Place the filling piece - diaphragm sub-assembly (4
to 9) onto the
housing
(19) and over the spring (8) so that the
spring (8) fits inside the spring cup of the
diaphragm
(7) and
so that the mounting screw holes of the filling piece (9) are
aligned
with the four
screw holes
of the housing (19).
7.3.20
Place
the
body
(2) onto the
filling
piece (9) so that the
exhaust port of the
body
(2) faces the same direction as the
VX Vent Valve tab on the
filling
piece (9), then
install
four
3
/8"
x 1
1
/2" hex. head cap screws (1)
through
the
aligned holes
of the housing (19) and filling piece (9) and into the body
(2).
Equally
tighten the screws (1) in an alternating
fashion to 20-25 ft-lbs.
7.3.21 Install a NEW wire mesh strainer (3) in place in the
inlet port #1 of the body.
8.0 TESTING
AND
ADDITIONAL
INFORMATION
8.1 IMPORTANT: After the
VX
Vent
Valve
Portion, Part
No.
699505, has been assembled, BUT BEFORE it is
returned to service, it MUST PASS a series of test
following the procedures of the current issue of the
Wabtec Corporation Test
Specification
T-4322-O.
8.2 IMPORTANT: Whenever
the VX Vent Valve Portion,
Part
No.
699505,
is removed from an
equipment arrangement
for any reason, and it is reinstalled or replaced with a
NEW or repaired and tested
VX Vent Valve
Portion, a NEW
mounting gasket MUST BE used. This 1" flange fitting
gasket, Part No.
93986,
is not a part of the VX Vent
Valve
Portion, but it is
included
in the Rubber Parts Kit, Part No.
654716.
8.3 IMPORTANT: Whenever
the VX Vent Valve Portion,
Part
No. 699505, is removed from an
equipment
for any
reason, and it is
reinstalled
or
replaced
with a NEW or
repaired and tested
VX Vent Valve
Portion, a
stationary
vehicle
test MUST
BE
made
to be sure that the
VX Vent
Valve
Portion functions
properly
in the
total equipment
arrangement.
8.4 Consult your Wabtec Corporation Representative
if
additional
information is required.
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