. Air brake text for engineers and firemen; . pounds above the feed valve regulation merely by the use ofrelease position of the automatic brake valve, the position whichshould be used during such braking. Construction and Operation. Plate 94 shows a sectionalview of this governor with steam valve 5 open. Connection Bleads to the boiler; P to the air pump; MR to the main reser-voir ; ABV to the automatic brake valve; FVP to the feed valvepipe, and W is the waste pipe connection. Steam enters at B andpasses by steam valve 5 to connection P, and thence to the governor regulating head on
. Air brake text for engineers and firemen; . pounds above the feed valve regulation merely by the use ofrelease position of the automatic brake valve, the position whichshould be used during such braking. Construction and Operation. Plate 94 shows a sectionalview of this governor with steam valve 5 open. Connection Bleads to the boiler; P to the air pump; MR to the main reser-voir ; ABV to the automatic brake valve; FVP to the feed valvepipe, and W is the waste pipe connection. Steam enters at B andpasses by steam valve 5 to connection P, and thence to the governor regulating head on the left is called the excess pres-sure head and the one on the right the maximum pressure from the main reservoirs flows through the automatic brakevalve (when the latter is in release, running or holding posi- 214 NO. 6 ET LOCOMOTIVE BRAKE EQUIPMENT. tion) to the connection marked ABV into chamber d below dia-phragm 28. Air from the feed valve pipe enters at the connec-tion FVP to chamber f above diaphragm 28, adding to the pres-. PLATE 94. sure of regulating spring 27 in holding it down. As this springis adjusted to about 20 pounds, this diaphragm will be held downuntil the main reservoir pressure in chamber d slightly exceeds NO. 6 ET LOCOMOTIVE BRAKE EQUIPMENT. 215 the combined air and spring pressure in chamber /. At suchtime, diaphragm 28 will rise, unseat its pin valve and allow airto flow to chamber b above the governor piston, forcing thelatter downward, compressing its spring, and restricting the flowof steam past steam valve 5 to the point where the pump willjust supply the leakage in the brake system. When main reservoirpressure in chamber d becomes reduced, the combined spring andair pressure above the diaphragm forces it down, seating its pinvalve. As chamber b is always open to the atmosphere through thesmall vent port c, the pressure in chamber b above the governorpiston will then escape to the atmosphere and allow the pistonspring and steam pressure
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidairbraketextfore00nati
