Diseases of the air brake system; their causes, symptoms and cure . - be dirt under the seat of this valve,boiler scale perhaps, or what is much more probabe, itmay be steam pressure under the piston (19). If this be. Plate 7 A Mason Regulator. Diseases of the Air Brake System. 33 the case, it is very evident that the auxiliary valve (8) isnot seating properly, for if it did no steam could then getunder the piston (ID ). This will generally be found to be the cause of thistrouble, for this valve, being smaller and more delicatethan the main valve (21), will naturally be more sensitiveto dirt a
Diseases of the air brake system; their causes, symptoms and cure . - be dirt under the seat of this valve,boiler scale perhaps, or what is much more probabe, itmay be steam pressure under the piston (19). If this be. Plate 7 A Mason Regulator. Diseases of the Air Brake System. 33 the case, it is very evident that the auxiliary valve (8) isnot seating properly, for if it did no steam could then getunder the piston (ID ). This will generally be found to be the cause of thistrouble, for this valve, being smaller and more delicatethan the main valve (21), will naturally be more sensitiveto dirt and need more frequent attention. To get thevalve (8) out proceed as follows: Shut off both steam and air. Remove the cap (1) andunscrew the adjoining screw(2) until all tension is removedfrom the spring (5). Take out the screws (9) and removethe bonnet and diaphragm; when, by unscrewing the nut(25) and lifting out the small spring, the auxiliary valve(8) ma} be reached. This valve should work with consid-erable freedom, and have a good tight seat. TOO LITTLE AIR—PUMP STOPPED. If the pump stops, and the regulator will not let it goto work again, it is very clear that for some reason orother the main valve (21
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