Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . rake-pipe reduction. LAP POSITION. When the brake-pipe reduction ceases, air continuesto flow from the auxiliary reservoir through ports z andr to the brake cylinder, until the pressure in the chamberR becomes enough less than that of the brake pipe tocause piston 4. and graduating valve 7 to move to theright until the shoulder on the piston stem strikes the left-hand end of slide valve 3. As the friction of piston andgraduating valve
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . rake-pipe reduction. LAP POSITION. When the brake-pipe reduction ceases, air continuesto flow from the auxiliary reservoir through ports z andr to the brake cylinder, until the pressure in the chamberR becomes enough less than that of the brake pipe tocause piston 4. and graduating valve 7 to move to theright until the shoulder on the piston stem strikes the left-hand end of slide valve 3. As the friction of piston andgraduating valve is much less than that of the slide valve,the difference in pressure which will move the piston and ET BRAKE EQUIPMENT 739 the graduating valve, will not be sufficient to move allthree; consequently, the piston stops in the position shownin Fig. 329. This movement has caused the graduatingvalve to close port 3, thus cutting off any further flow ofair from the auxiliary reservoir to the brake , no further change in air pressures can oc-cur, and this position is called Lap, because all ports arelapped,—that is, closed. >AmM»MW//A. FIG. 329. LAP POSITION If it is desired to make a heavier application, a furtherreduction of the brake-pipe pressure is made, and theoperation described above repeated, until the auxiliaryreservoir and brake cylinder pressures become equal, 740 LOCOMOTIVE ENGINEERING after which any further brake-pipe reduction is only awaste of air. About twenty pounds brake-pipe reductionwill give this equal??i;n. RETARDED RELEASE AND CHARGING POSITION. The K triple valve has two release positions., full-re-lease and retarded-release. Which one its parts will moveto when the train brakes are released, depends upon howthe brake-pipe pressure is increased; if slowly, it will befull release, and if quickly and considerably, it will be re-tarded-release. It is well known that in a freight train,when the engineer releases the brakes, that the rap
Size: 1739px × 1436px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
