. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . g and re-lease slide valve chambers, forcing the will then move to secondary service posi-tion; that is, be moved to a positiontailed secondary service, in which a con-m rti, m is made from the emergency res-ell nir through the equalizing slide valveto the pressure chamber, which is butmomentary and merely compensates fora slight drop in pressure due to the addi-tional pressure chamber space created bythe movement of the pistons; or, in otherwords, the displacement of the equalizingpiston is
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . g and re-lease slide valve chambers, forcing the will then move to secondary service posi-tion; that is, be moved to a positiontailed secondary service, in which a con-m rti, m is made from the emergency res-ell nir through the equalizing slide valveto the pressure chamber, which is butmomentary and merely compensates fora slight drop in pressure due to the addi-tional pressure chamber space created bythe movement of the pistons; or, in otherwords, the displacement of the equalizingpiston is sufficiently great, compared withthe volume in the equalizing slide valvechamber, to require tin-- provision, and atthis time the equalizing slide valve alsoconnects the equalizing and release slide\ al\ e chambers. In this manner a brake pipe reductionin conjunction with a prompt and positivemaintenance of the pressure chamber fromthe emergency reservoir must result inthe equalizing piston and slide valve mov- EdUAUZINC GRAD. SPRING RELEASE GRAD. SPRING EQUALIZING —PISTON EQUALIZING»I9T0N STOP. COUALIZINC STOP SPRING DIRECT & GRAD. RtL CAP BRAKEPIPE SER CYL \ ^EMER. CYL CMER CYL Ex EMER RES SERVK E POSITION. 4 or 5 lb., brake pipe reduction; thereforesi Hue little difference in pressure is re-quired to start the release and equalizingpistons to move and the application pistonwhich is held in release position with aspring under a fixed tension. Tin application portion is identical withthe application portion of a distributingcalve, being similar in const ruction andperforming the same work; that is, itsmovement to application position closeslin s, rvice cylinder exhaust port serviceand admits service reservoir pressureinto the service brake cylinder untilbrake cylinder and application chamberres are equal, when it will be movedto a lap position; then if there is anyleakage in the service brake cylinder, theleakage by lowering the pressure will per- release piston to prelimin
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