Excerpt from The Slide-Valve and Its Functions, With Special Reference to Modern Practice in the United States: With Ninety Diagrams and Illustrations
The Slide-Valve has been called the heart of the steam engine, and the simile is not badly chosen; for the valve is a distinct and vital part of the engine, controlling and regulating the circulation of its life-fluid in a manner not entirely unlike that of a living heart. It is the office of the slide-valve to direct the motion and action of this subtile and expensive fluid to best advantage and without waste, so as to make the engine an effective and economical motor.
As the valve must be designed so as to effect an economical steam distribution in the cylinder, it has attained a peculiar significance in scientific steam engine construction; but durability and permanency of form are requirements not less imperative, and they involve constructive problems of a different order. In recognition of this fact an attempt has been made in this work to treat the subject with due regard to the various requirements of modern practice. The fundamental principles are fully explained, and are illustrated by new graphical methods, and a number of special valve constructions are described and analyzed, in order to exhibit in a comprehensive manner how the exacting conditions of higher steam pressure and higher speed have been met by modern engine-builders.
An endeavor has been made to present the subject-matter of this book in a condensed form, as being best adapted to the requirements of practical men, and the author has in this respect followed the suggestions of an extensive personal experience.
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