TRAIN AIR-SIGNALING SYSTEM 



405 



Pc.No.Ref. 

 2,205 

 9.619 2 



2,209 

 2,224 

 2,223 

 2,225 

 6,984 

 2,217 

 2,218 



2.215 10 



2.216 11 

 2,214 12 



2.165 13 

 2,204 14 



2.166 15 

 2.210 16 

 1,731 17 



fPIPE TO 

 WHISTLE 



No. Name of Part 



Signal valve, complete. 

 Diaphragm case, complete, includes four 



each of 7 and 9. 

 Diaphragm cap. 



-in union swivel. 



-in union nut. 



-in union gasket, 

 j-in eyebolt and nut. 

 Diaphragm- valve nut. 

 Eyebolt rivet. 



Lower diaphragm plate and valve stem. 

 Upper diaphragm plate. 

 Diaphragm. 

 $-in union nut. 

 |-in union gasket, 

 i-in union swivel. 

 Lower cap nut. 

 Pin for diaphragm-valve nut. 



Operation of Valve. When the signal pipe is being charged, 

 air enters the signal valve, and, passing through the small port 

 d, charges chamber A. It also passes through the passage C 

 and feeds up slowly past the stem into chamber B, charging 

 this to the same pressure as chamber A. The pressures in 

 chambers A and B and the signal pipe are equal when the 

 pipe is fully charged. 



When the signal cord is pulled and a reduction is made in 

 the signal pipe, it causes a reduction of pressure in the signal 



