410 WATER-DISTRIBUTING SYSTEM 



The governor valve should be placed between the auxiliary 

 reservoir and water-supply air-pressure reservoir, so that the 

 auxiliary reservoir connection is at AR and the air-pressure 

 reservoir connects at PR. 



The adjustment of spring 1 7 is such that a pressure in cham- 

 ber e of 60 Ib. on diaphragm 11 is required to raise its valve from 

 its seat. Therefore, the auxiliary reservoir of the air brake is 

 charged to this extent before any pressure passes to the air 

 reservoir of the water-supply system. 



Air pressure from the auxiliary reservoir entering the valve 

 at AR reaches chamber e through port d, and as it approximates 

 60 Ib., diaphragm // and its valve are lifted, and valve 19 is 

 forced from its seat, thereby permitting the pressure to pass to 

 chamber /, and through port g to the air reservoir of the water- 

 supply system. The stem h of valve 19 is purposely made a 

 comparatively snug fit in its aperture in order to produce a 

 sluggish feed of air past it to the air tank, causing auxiliary- 

 reservoir pressure to be only slightly affected by any demand 

 upon its air supply. 



REDUCING VALVE 



The reducing valve shown in the accompanying cross-section 

 weighs 5f Ib. Its piece number is 2,663; the piece and refer- 

 ence numbers of the various parts are given in the accompany- 

 ing list. 



PC. No. Ref. No. Name of Part 



2,664 2 Valve body, bushed. 



2.675 3 Spring box. 

 2,599 4 Check-nut. 

 2,680 5 Supply-valve cap. 

 2,166 6 5-in. union swivel. 

 2,165 7 f-in. union nut. 

 2,204 8 5-in. union gasket. 

 2,604 9 Strainer. 



2.670 10 Piston stem. 



2.672 11 Large diaphragm. 



2.673 11 Small diaphragm. 

 2,668 12 Piston, includes 13. 



13,206 13 Piston ring. 



2.671 14 Piston nut. 

 3,942 15 C9tter. 



2.674 16 Diaphragm ring. 



2.676 17 Regulating spring. 



