. American engineer and railroad journal . LVE. chamber in the steam chest. This pressure then acts against faceF of the valve, holding it against its seat, overcoming the resist-ance of the pressure against face G, which is from 15 to 20 percent, smaller in area, and is subjected to pressure from the cyl-inder, connection being by a 3 in. pipe, through passage B. Pas-sage C connects to a similar passage in a similar valve at theopposite end,of the cylinder by a 2V2 in. pipe. When for anyreason the pressure on the cylinder rises to a point 15 or 20 percent, above the boiler pressure the valve
. American engineer and railroad journal . LVE. chamber in the steam chest. This pressure then acts against faceF of the valve, holding it against its seat, overcoming the resist-ance of the pressure against face G, which is from 15 to 20 percent, smaller in area, and is subjected to pressure from the cyl-inder, connection being by a 3 in. pipe, through passage B. Pas-sage C connects to a similar passage in a similar valve at theopposite end,of the cylinder by a 2V2 in. pipe. When for anyreason the pressure on the cylinder rises to a point 15 or 20 percent, above the boiler pressure the valve is then forced open andthe pressure relieved through the port C to the other side of thepiston. When the throttle is closed and the locomotive beginsto drift the compression in the cylinder will force the valve openand the vacuum created in the steam connection will hold it inthat position, allowing a free passage on both sides of the pis-ton, from one end of the cylinder to the other. May, 1008. AMERICAN ENGINEER AND RAILROAD JOURNAL 195.
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