. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . eaof the centre is , giving a differencein area of sq. ins,, and assuming thatthe steam pressure within the heads is200 lbs. per square inch, same would fur-nish an unbalanced force of 395 lbs.,which would tend to force the pistonvalve ahead at all times when throttlevalve is open. The foiegcing refers to an indirectmotiiiu; whereas, with a direct type ofconstruction the large bore of the pistonvalve chamber bushing would be at theback end. In both cases the object is topi event ch
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . eaof the centre is , giving a differencein area of sq. ins,, and assuming thatthe steam pressure within the heads is200 lbs. per square inch, same would fur-nish an unbalanced force of 395 lbs.,which would tend to force the pistonvalve ahead at all times when throttlevalve is open. The foiegcing refers to an indirectmotiiiu; whereas, with a direct type ofconstruction the large bore of the pistonvalve chamber bushing would be at theback end. In both cases the object is topi event chucking of the valve gear, andto cause the heavy or front half of theecciiitric strap to he in contact againstthe eccentric at all times, causing theblades to be under compression. Thiswould eliminate, to a certain degree, thefracturing of the eccentric blades andstraps and the loosening of the bolts andnuts through the valve gear. It is neces-sary, however, to shorten the length ofthe port proportionally at the end of thecylinder having the greater diameter; oran easier method would ho to lengthen. CAKTAGENACOLUMIIIA RAIIAVAY. the port at the end having the smallerdiameter. In selling valves having difTcrentiatedheads it is recommended that a springof approximately 400 lbs, tension be used,and anchored ahead of and connected tothe top end of the rocker arm on an in-ilircct engine, and back of the rocker armon a direct engine. The difTercntial men-tioned will afford n greater unbalancingeffect than is required when running 40 RAILWAY AND LOCOMOTIVE ENGINEERING. Januarj, 1910. miles per hour, or less, and not sufficientto bring about the desired effect when thespeed is over 60 miles per hour. With the Walchaerts valve gear it issuggested that the back end be boredlarger, which will put the radius rodunder compression and put the eccentricrod under tension, putting the strain onthe back side of the crank arm, thereforetaking the strain off the liner and keyahead of the crank arm.
Size: 1824px × 1369px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
