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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 and its 
components being new or 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 
vehicle test must be made to insure that this 
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 are the property of 
Wabtec  Corporation  and  may  not  be 
replicated  in  any  manner  or  form  without 
the prior sole written consent of an Officer of 
Wabtec Corporation

.

 

 

 

™ Trademark of Wabtec Corporation 

© 2017 Wabtec Corporation. All rights reserved 

Summary of Contents for VX

Page 1: ...pecification At the time this device is applied to the brake equipment arrangement a stationary vehicle test must be made to insure thatthis device functions properly in the total brake equipment arra...

Page 2: ...valve diaphragm assembly Brake pipe air flow continues through the passage in the seated piston where it is blocked by the exhaust valve Brake pipe air under pressure in cavity b1 flows through the c...

Page 3: ...unseated piston stem at the exhaust valve Cavity b2 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 t...

Page 4: ...hich 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 br...

Page 5: ...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...

Page 6: ...4211 7 S 7 Operation Maintenance Instruction September 2017 Page 6 of 10 Figure 4 VX Vent Valve Portion...

Page 7: ...r 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 Inspect the body 2 and housing 19 for damage Pay particular attention to t...

Page 8: ...t is in such a condition that may result in the unsatisfactory operation of the VX Vent Valve Portion 7 3 ASSEMBLY 7 3 1 Apply Number 2 Silicon Grease Wabtec Corporation Specification M 7680 2 to a NE...

Page 9: ...he filling piece 9 7 3 17Install 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...

Page 10: ...4211 7 S 7 Operation Maintenance Instruction September 2017 Page 10 of 10 Wabtec Corporation 1001 Air Brake Avenue Wilmerding PA 15148 412 825 1000 Fax 412 825 1019 www wabtec com...

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