Wabtec VX Instruction Manual

4211-7, S.7
Operation & Maintenance Instruction
Page 1 of 10
September, 2017
VX™ VENT VALVE PORTION, PART NO. 699505
SEPTEMBER,2017
Supersedes issue dated December, 2003
NOTE: The following description and
operation is based on this device andits
components being newor this device and
its components having been repaired,
tested, installed and maintained in
accordance with instructions issued by
this and any other applicable Wabtec
Corporation publications.
WARNING: At the time any part is
replaced in this device, the operation of the
complete device must pass a series of
tests prescribed in the latest issue of the
applicable Wabtec Test Specification.At the
time this device is applied to the brake
equipment arrangement, a stationary
vehicletestmustbemadetoinsurethatthis
device functions properly in the total brake
equipment arrangement. (Consult your
local Wabtec Corporation
Representative for identity of the test
specification, with latest revision date, that
covers this device.)
IMPORTANT: Only Wabtec Corporation
supplied parts are to be used in the repair
of this device in order to obtain satisfactory
operation. Commercially available non-
O.E.M. parts are unacceptable.
NOTE: The part numbers and their
associated descriptions arethe propertyof
Wabtec Corporation and may not be
replicated in any manner or form without
thepriorsolewrittenconsentof an Officerof
Wabtec Corporation.
™Trademark of Wabtec Corporation
© 2017 Wabtec Corporation. All rights reserved

4211-7, S.7
Operation & Maintenance Instruction
September, 2017
Page 2 of 10
NOTE: The following description and operation is based on
this device and its components having been repaired, tested,
installed and maintained in accordance with instructions of
this and any other applicable publications issued by the
Wabtec Corporation, or its predecessor, the Westinghouse
Air BrakeCompany.
1.0 DESCRIPTION
The VX Vent Valve Portion is a double
diaphragm type valve
which, when properly installed and maintained, functions to
deplete brake pipe air locally at a rapid rate to assist in
propagating an emergency brake application whenever the
main line of brake pipe is reduced at an emergency rate.
The VX Vent Valve Portion features increased emergency
venting capacity and jump distance capabilities. A unique
diaphragm design incorporated within the Portion eliminates
the need for a separate venting piston and provides a self-
2.1 RELEASE AND RUNNING
Brake pipe air under pressure entering Port 1 flows through
the metal screen filter into cavity b, on the non-spring side of
the vent valve diaphragm assembly, through passage B into
cavity b1, above the control diaphragm and piston assembly,
past the control piston seat of the body and into cavity b2 on
the spring side of the vent valve diaphragm assembly. Brake
pipe air flow continues through the passage in the seated
piston where it is blockedby the exhaust valve. Brake pipe
air under pressure in cavity b1 flows through the charging
chokeintothe controlpressurevolumeQ.
purgingaction. Operationof aVX Vent Valve Portion at one
location (in a train consist) aids in producing an emergency
rate of brake pipe reduction at the next locomotive unit or car
andactionof theVentValve Portion oneach succeeding unit
or car assists in a fast transmission of an emergency brake
signalthroughanopentrainlinepipe.
The VX Vent Valve Portion is designed so that it can be
readily removed from the pipe bracket, laminate, mounting
plate, or branch pipe tee on which it is mounted, for
maintenance or repair. Provision is made for the attachment
of a vent protector arrangement at the exhaust port of the
Portionbody.
The VX Vent Valve Portion may be used in equipment
arrangements where the air pressure does not exceed 150
psig. Special installation procedures are required when
installing the VX Vent Valve Portion in specific equipment
arrangements. Consult your Wabtec Corporation
Representativeforinformationon yourrequiredapplications.
2.0 OPERATION
NOTE: The views shown in Figures 1, 2, 3 and 4 are
diagrammatic representations for functional analysis only.
They are not to be used as actual physical representations
oftheVX VentValvePortion.
Figure 1 - Release and Running
Diagrammatic View

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Operation & Maintenance Instruction
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September, 2017
2.2 EMERGENCY - FIRST STAGE
When an emergency rate of brake pipe reduction occurs,
the brake pipe air pressure in cavities b, b1 and b2 is reduced
rapidly creating a differential between the brake pipe pressure
in cavities b, b1 and b2 and the air pressure in the control
pressure volume Q. This causes the control diaphragm and
piston assembly to move, unseating the piston stem from its
seat on the exhaust valve and seating the piston on the piston
seat of the body. The seating of the piston isolates cavity b2
from cavity b1. Air pressure in cavity b2 is then directed to
exhaust through the passage in the unseated piston stem at
the exhaust valve. Cavityb2 is exhausted quickly due to its
small volume.
2.3 EMERGENCY - SECOND STAGE
The rapid exhaust of air pressure from cavity b2 creates a
differential on the non-spring side of the vent valve diaphragm
assembly causing this assembly to move away from its seat
and connects brake pipe air from port 1 and cavities b and b1
to exhaust (Port EX). Air pressure in the control pressure
volume Q then flows to atmosphere through the charging
choke of the control piston, cavity b1, passage B, cavity b
and port EX, when the air pressure in the control pressure
volume Q is vented, the vent valve diaphragm assembly and
the control diaphragm and piston assembly are returned to
the Release Position bythe force exertedbythe spring.
Figure 2 - EmergencyPosition - 1st Stage
Diagrammatic View Figure 3 - Emergency Position - 2nd
Stage
Diagrammatic View

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Operation & Maintenance Instruction
September, 2017
Page 4 of 10
3.0 MAINTENANCE SCHEDULE
3.1 IMPORTANT: The
VX Vent Valve Portionisto be removed
from the equipment arrangement and taken to the shop, be
completely disassembled, the parts cleaned, inspected,
lubricated and then reassembled using NEW Wabtec
Corporation rubber parts and other NEW Wabtec Corporation
parts as specified in accordance with the following vehicle
application schedule, or more frequently, if service conditions
so indicate. The assembledportion is then to be tested for
correctoperation.
Recommended
Frequency - At
Type of Application Least Once Every
FreightCars 120Months
Locomotives 12 Months
Passenger (Interstate) 36Months
Transit 24Months
4.0
PARTS CATALOG AND REPLACEMENT PARTS
4.1
PARTS CATALOG
4.1.1 IMPORTANT: When ordering replacementparts for
the VX Vent Valve Portion, Part No. 699505, refertothe current
issueof theWabtec Corporation Parts Catalog 3211-7,S.7.
NOTE: The reference numbers used in the Parts Catalog
and thoseusedin this publication may differ. Check the part
number and the descriptive part name to be sure that the
desired partis ordered.
4.2
REPLACEMENT PARTS
4.2.1 IMPORTANT: To obtain satisfactory operation and
reliability of the VX Vent Valve Portion, ONLY W abtec
Corporation replacement parts are to be used in the
maintenance of this portion.
5.0
SAFETY PROCEDURES AND WARNINGS
WARNINGS:
The following statements of warning apply all or in part
wherever the symbol appears in the maintenance
procedures. Failure to observe these precautions may
result in serious injury to those performing the work
and/orbystanders.
•The use of an air jet, which must be less than 30
p.s.i.g., to blow parts clean or to blow them dry
after being cleaned with a solvent will cause
particles of dirt and/or droplets of the cleaning
solvent to be airborne. Wire brushing may also
cause particles of dirt, rust, and scale to become
airborne. These conditions may cause skin and/or
eye irritation.
•When using an air jet, do not direct it toward
another person. Improper use of air jet could result
in bodily injury.
•Personal eye protection must be worn when
performing any work on this device or its
components parts to avoid any possible injury to
the eyes.
•The use of solvents as cleaning agents and the use
of lubricants can involve health and/or safety
hazards. The manufacturers of the solvents and
lubricants should be contacted for safety data (such
as OSHA Form OSHA-20 or its equivalent). The
recommended precautions and procedures of the
manufacturers should be followed.
•When performing any test or work on devices or
equipment while they are on the vehicle (on car
test, etc.) special precautions must be taken to insure
that vehicle movement will not occur which could
result in injury to personnel and/or damage to
equipment.
•Assembly may be under a spring load. Exercise
caution during disassembly so that no parts "Fly
Out" and cause bodily injury.
•All air supply and/or electric current to this device
and/or to any components part must be cut-off
before this device and/or any component part is
removed from the equipment arrangement.
•"Bottled" up air under pressure (even though air
supply is cut-off) may cause gaskets and/or particles
of dirt to become airborne and an increase in sound
level when this device and/or any component part
is removed from the equipment arrangement.
•Personal eye and ear protection must be worn and
care taken to avoid possible injury when performing
any work on this device and/or component part.

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Operation & Maintenance Instruction
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September, 2017
•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 usedto clean the reusable parts of theVX
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 compoundconsisting of onepart ofgraphite,Wabtec
Corporation SpecificationM-7695-2, (AARSpecificationM-
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
LockingSealant, 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
installationof 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 wiremeshstrainer (3) from
its port in the body(2).
7.1.3 Removethe four3/8" x 11/2" 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 thespring (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 51/4" O.D. o-ring (4) from its
groovein the filling piece(9).
7.1.13Remove the piston-diaphragm sub-assembly(13,
14, 15) as a unit from the piston stem (17) and diaphragm
follower (16).

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Operation & Maintenance Instruction
September, 2017
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Figure 4 - VX Vent Valve Portion

4211-7, S.7
Operation & Maintenance Instruction
Page 7 of 10
September, 2017
7.1.14Remove and SCRAP the diaphragm (15) from the
piston(13).
7.1.15 Remove the
diaphragm follower (16) from the piston
stem (17).
7.1.16
Remove and SCRAP the vent protector seal (27) from
the washer (26) in the bottom of the housing (19). The seal
hasaninterferencefit withthe washer andcanbe pulled out.
7.1.17 WARNING: During the following procedure,
the spring (24) will be compressed. Exercise care so
that no parts are inadvertently expelled from the
assembly. Inadvertently expelled parts may cause
bodily injury and/or damage to property.
Carefully depress the washer (25) and spring (24) into the
housing (19), then, while holding these parts depressed,
remove the retaining ring (26) from its groove in the housing
(19). Slowly release the hold on the washer (25) and spring
(24) permitting the spring (24) to extend its fulltravel.
7.1.18
Remove the washer (25), spring (24) and exhaust valve
withseal(21)from thehousing(19).
7.1.19
Remove and SCRAP the exhaust valve seal (22) from
the exhaust valve (23).
7.2 Cleaning and Inspecting
7.2.1
NON-REUSABLE PARTS
7.2.1.1 ALL gaskets,o-rings,
seals, the wire mesh strainer
and diaphragms ARE TO BE SCRAPPED and replaced with
NEWWabtec Corporation parts.
NOTE:
A Kit of Rubber Parts for the VX Vent Valve Portion is
available and may be obtained by ordering Part Number
654716. See Parts Catalog 3211-7, S.7 for parts included in
this Kit.
7.2.2
BODY AND HOUSING
IMPORTANT: Cleaningsolvents are to be used in a well
ventilated area.
7.2.2.1 Usinga
clean, lint-free rag that has beensaturated
with the cleaning solvent, as described in Section 6.1.1, clean
the interior and exterior surfaces of the body (2) and housing
(19).
7.2.2.2 After these parts are cleaned, they MUST BE
completely dried. Use a low pressure jet of clean, dry air to
blow the parts dry.
7.2.2.3 Inspectthe body (2) and housing(19) for damage.
Pay particular attention to the bushings within the housing.
The bushings should be free of nicks, scratches and pits.
Replace the body and/or housing if found to be damaged, or
if they show signs of excessive wear, or if theyare in such a
condition that may result in the unsatisfactory operation of
theVXVentValvePortion.
7.2.3 EXHAUST VALVE
7.2.3.1 Dip the exhaust valve (23)ina bath of the prescribed
cleaning solvent, Section 6.1.1 and promptly wipe it clean
with a clean,lint-freecloth.
7.2.3.2 Blow the exhaust valve(23) completely dry,usinga
lowpressure jet of clean,dry air.
7.2.3.3 Inspect the exhaust valve(23). It is to be replaced
if it is found to be nicked, cut, cracked, broken, or damaged
in any way, or if it is in such a condition that may resultin the
unsatisfactory operation of theVXVentValvePortion.
7.2.4 REMAINING REUSABLE PARTS
7.2.4.1 Wash all remaining reusable parts using the cleaning
solventas describedin Section 6.1.1.
7.2.4.2 The springs (8, 24) may be wire brushed to assist
in the removalof anydirt, rust or scale.
7.2.4.3 After the parts have been cleaned, they MUST BE
completely dried. Use a low pressure jet of clean, dry air
blow to the parts dry.
7.2.4.4 Inspect the piston (13). Replace the piston if it is
bent, broken, damaged, excessively worn,or if it is in such a
condition that may result in the unsatisfactory operation of
theVXVentValvePortion.
7.2.4.4.1 Remove the 1/8" choke plug (14) from the piston
(13) and placeit in a bath of the cleaning solvent to soak.
7.2.4.4.2 While the choke plug is soaking, inspect the
opening in the piston (13) from which the choke plug (14)
was removed to be sure that it is clean and free of dirt. If
necessary, blow the opening clean with a low pressure jet of
clean,dryair.

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Operation & Maintenance Instruction
September, 2017
Page 8 of 10
7.2.4.4.3Remove the choke plug (14) from its solvent and
blow it completely dry, using a low pressurejet of clean,dry
air.
7.2.4.5 Inspect the piston (13). Replace the piston if it is
bent, broken, damaged, excessively worn,or if it is in such a
condition that may result in the unsatisfactory operation of
theVXVentValvePortion.
7.2.4.6
Inspect the orifice of the choke plug (14) to be sure
that it is clean and that its size, 1.1mm Drill, has not been
changed. DO NOT use hard or sharp metal tools to clean
the orifice as its size and shape MUST NOT be changed.
Replace the choke plug if it is damaged in any wayor if the
size of the orifice, 1.1mm Drill,has been changed.
7.2.4.7 Lightly coat the threads of the cleaned and
inspected or NEW choke plug (14) with the oil and graphite
compound as described in Section 6.2.2, then install the
choke plug (14) in place in the piston (13). The choke plug it
to be installedat its full travel in the piston (13).
7.2.4.8
Inspect the piston stem (17). Replace the stem if it
is found to be bent, cracked, broken, damaged in any way,
or if the size of the passage way of the stem has been
changed, (the size of the passage way MUST BE a 0.156"
Drill) or if the stem is in such a condition that may result in
the unsatisfactory operation of the VX Vent Valve Portion.
Be sure that all of the old locking sealant is cleaned from the
stem threads.
7.2.4.9
Inspect the springs (8,24). Replace any spring that
is cracked, rusted, pitted, broken, bent damaged in any way,
or if it has taken a permanentset.
7.2.4.10
Inspect theretainingring(26). Replace the retaining
ring (26) if it is not elastic enough to holdsecurely.
7.2.4.11
Inspect the remaining parts. Replace anypart that
is cracked, cut, bent, broken, excessively worn, damaged in
any way, or that is in such a condition that may result in the
unsatisfactory operation of theVXVentValvePortion.
7.3 ASSEMBLY
7.3.1 Apply Number 2 Silicon Grease, Wabtec Corporation
Specification M-7680-2 to a NEW exhaust valve seal (22)
and press in place in the exhaust valve (23), then install the
exhaust valve withseal (21), seal end first, into the bushing
in the bottom of the housing (19).
7.3.2 Install the exhaust valve spring (24) into the bottom of
the housing (19) so that the spring (24) is seated on the
exhaust vale(23), then install the washer (25) so that it seats
onthespring (24).
7.3.3 WARNING: In the procedure which follows,
the spring (22) will be compressed. Exercise care so
that no parts are inadvertently expelled from the
assembly.
Carefully depress and hold the washer (25) and spring (24)
far enough into the bushing in the housing (19) to expose the
retaining ring groove, then while holding these parts
depressed, install the retaining ring (26) being sure that it
"snaps" into its groove. Slowly release the hold on the washer
(25) and spring (24) permitting the spring (24) to extend its
full travelto seatthe washer (25) ontheretaining ring (26).
7.3.4 Apply Number 2 Silicon Grease, Wabtec Corporation
Specification M-7680-2 to a NEW vent protector seal (27)
and press in place in the washer (25). The seal (27) will
haveaninterferencefit inthe washer.
7.3.5 Install a NEW diaphragm (15) on the piston (13, 14)
and be sure that the inner bead of the diaphragm fits into
the bead groove of the piston (13).
Figure 5 –Piston Diaphragm (15)
7.3.6 Install the diaphragm follower (16), flat side up, onto
the threaded end of the piston stem (17), then install the
diaphragm and piston sub-assembly (13, 14, 15) so that the
diaphragm (15) contacts the diaphragm follower (16).
7.3.7 Install a NEW seal seat (12) in placein its groove on
thepiston (13).
7.3.8 Install the washer (11) on the piston stem (17) so that
it contacts and seats on the seal - seat (12).
7.3.9 Apply a coating of locking sealant, Wabtec Corporation
Specification M-7499-5, to the exposed threads of the piston
stem (17).

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Operation & Maintenance Instruction
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September, 2017
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 againstthe washer (11). Using
a 7/8" open end wrench on theflats of the piston stem (17) to
hold the sub-assembly, torque the 1/2" jam nut (10) to 30 to
35foot-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
instructionsfor propercuringtime.
7.3.11 Apply a light coating of Number 2 Silicone Grease,
Wabtec Corporation SpecificationM-7680-2,to thesurfaces of
a NEW
11/16" O.D. o-ring (18).
Also, fill the o-ring groove on the
piston stem (17) and lightlylubricate the lower bushing of the
housing (25),the bushing which theo-ring will contact, with the
lubricant.
7.3.12 Install the NEW lubricated 11/16" O.D. o-ring (18) in it s
groove onthepiston stem(17). Remove anyexcess 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 ofthe diaphragm (15)initsgroove.
7.3.14 Install the control spring(8)overthe 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 thefilling 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
grooveof the filling piece(9). Apply finger pressure to seatthe
beadof 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
threescrewholesoftheclampingplate(6)are aligned with the
tappedholesin the fillingpiece (9).
7.3.17 Install three#8x1/2" buttonheadscrews(5) through the
aligned holes of the diaphragmclamping ring (6)andthe filling
piece (9). Equally tighten the screws to maintain alignment
and secure the sub-assembly. Torque the screws to 20-23
in-lbs.
7.3.18Install a NEW 51/4" 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.
7.3.19Place the filling piece - diaphragm sub-assembly (4
to 9) ontothe 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 withthe four screw holes of thehousing(19).
7.3.20
Place the body (2)ontothe filling piece(9)sothatthe
exhaustportofthe body (2)facesthesamedirectionasthe
VXVentValvetabonthe filling piece(9),then install four3/8"
x 11/2" 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.
7.3.21Installa 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 theVXVentValvePortion, Part
No. 699505, is removed from an equipment arrangement
for any reason, and it is reinstalled or replaced with a
NEW or repairedandtested VX Vent Valve Portion,aNEW
mounting gasket MUST BE used. This 1" flange fitting
gasket, Part No. 93986, is not a part of the VX Vent Valve
Portion,butit is included in the Rubber Parts Kit, Part No.
654716.
8.3 IMPORTANT: Whenever theVXVentValvePortion, 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 informationisrequired.

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WabtecCorporation
1001 Air Brake Avenue •Wilmerding, PA 15148
[phone] •Fax[phone]
www.wabtec.com