The Walschaert and other modern radial valve gears for locomotives

Subtitle: A Practical Treatise on the Locomitive Valve Actuating Mechanism Invented by Egide Walschaerts, With the History of Its Development and Its Evolution Into the Mechanically Correct Locomotive Valve Gear of the Present Day ... General Books publication date: 2009 Original publication date: 1912 Original Publisher: The Norman W. Henley publishing co. Subjects: Walschaert valve gears Walschaert valve-gear Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: THIRD DIVISION ADVANTAGES OF WALSCHAERT VALVE GEAR And Arguments for its Use as Against the Stephenson Link Motion THIRD DIVISION ADVANTAGES OF WALSCHAERT VALVE GEAR And Arguments for its Use as against the Stephenson Link Motion (1) Accessibility. There is not room enough for the Stephenson gear under a very large passenger or freight locomotive. The eccentrics are crowded, and proper inspection, not to speak of proper care, is difficult, except over a pit. Valve gear to be properly maintained must be accessible for inspection and lubrication. The accessibility of Walschaiert gear should reduce engine failures. (2) Weight. A saving of 1,745 pounds is possible by using the Walschaert gear, in the case of a very heavy passenger engine. The Stephenson gear, weighing as much as two tons, is far too heavy to be satisfactorily reversed twice in every revolution on fast running locomotives. (3) Directness. Walschaert gear transmits the mov-. ing force to the valve in very nearly straight lines, avoiding the springing and yielding of the rocker arms, rocker shafts, and transmission bars, whichcannot be avoided in these parts of the Stephenson motion, even if they are made very heavy. (4) Permanence o] Adjustment. The advantage of permanence of adjustment lies ...