LOCOMOTIVE ENGINES . 569 example , and in both examples the valves are frictionless in the act of lifting , which is the main thing to be studied in safety - valve arrangements . To carry this more fully into effect the ball safety … loaded valves have been success - Fig . 423 . — Ball Safety Valvewith Lever and Balance . fully adopted ; one form consist - a , Ball valve . b , Seat for valve . c , Lever . d , Stud . e , Salter spring balance . ing of a large plate 12 inches in diameter , loaded with a number of volute springs ,…
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