num_pages: 64
description: Illustrated throughout in scale drawings. Published in 1973 in Great Britain by Model and Allied Publications in paperback (staple binding) this 63 page book is all about Walschaerts' valve gear for steam locomotives - here model steam locomotives; however it is mainly because Walschaerts' valve gear became so firmly established as one of the principal reversing mechanisms employed in British locomotive practice that the late Henry Greenly set about the task of writing and illustrating this little book for the benefit model engineers. Otherwise such enthusiasts (who deserve to be encouraged) would be confronted with the intricacies and problems connected with the gear for the first time. In the original edition he pointed out that the outstanding and inherent feature of Walschaerts' gear is that if properly designed it is the perfect gear for accuracy of function in all the positions of the driver's reversing lever or screw and it can be argued that this is why it remains so popular and so much utilised. The fascination with the gear is that it is the principal feature of the modern high-speed steam locomotive and one that attracts attention by all and sundry whether the machine is stationary or in motion. How does it work? What do all the bits do? Where does each part fit and why? All questions that the gear begs in the mind of the viewer. Here is a mechanism that does not have to be hidden away between locomotive frames but which can be brought outside for ready access repair and maintenance. Chapters: Preface Application of the Valve Gear Design and Layout The Expansion Link Return Crank and Expansion Link Mechanism Lifting Links for Reversing Mechanism Return-Crank Design The Combination Lever Operation of Valve Gear and Valve Gear for 2-6-0 locomotive. Contains highly detailed technical drawings and tables (such as average heights and offsets of valve spindles for outside cylinders). An invaluable work for the model railway engineer
language: English
title: Walschaerts' Valve Gear
publisher: Percival Marshall & Co. Ltd.