. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ssure to the atmosphere,and while service cylinder pressures arelimited by safety valves, full emergencypressures are held to the stop. With twocylinder equipments (one for service andboth for emergency) a safety valve is un-necessary, as braking power is then basedon an 86-pound cylinder pressure. Witli a single cylinder equipment thedesired emergency action is obtainedthrough the combined action of an emer-gency piston and slide valve, a high pres-sure valve, a cut off valve and an inter-ce
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ssure to the atmosphere,and while service cylinder pressures arelimited by safety valves, full emergencypressures are held to the stop. With twocylinder equipments (one for service andboth for emergency) a safety valve is un-necessary, as braking power is then basedon an 86-pound cylinder pressure. Witli a single cylinder equipment thedesired emergency action is obtainedthrough the combined action of an emer-gency piston and slide valve, a high pres-sure valve, a cut off valve and an inter-cepting valve. The universal valve shown has threedistinct portions, equalizing or service,emergency and electric mounted on anangle bracket with suitable faces for at-tachment. The different portions are named in theillustrations, the equalizing portion whichperforms the work of a plain triple valveis directly affected by the reductions andrestoration of brake pipe pressure, andit controls directly and indirectly withother parts of the universal valve, thecharging of the reservoirs, the application. FIG. 3. TYPE U COMMON STANDARD UNIVERSAL VALVE. Another important feature is automaticemergency upon a depletion of brake pipepressure. Should the brake be applied andthe handle forgotten in lap position, leak-age might eventually reduce brake pipepressure to a predetermined point, where-upon an emergency application will auto-matically occur, which makes the brakealmost absolutely self operating. Full emergency braking power can be cf the brake and the release of the brake. The service and auxiliary reservoircombined form the reservoir volume forthe brake cylinder in service applications,and the emergency reservoir provides forgraduated release, high pressure emer-gency and recharge of the auxiliary. It should first be stated that duringthe transition period, while these universalvalves are used among triple valves that November, 1913. RAILWAY AND LOCOMOTIVE ENGINEERING. 405 have no
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
