ve has the advantage that the ball may be turned into any position to suit the wear . Various forms of direct spring - 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 ,… … Although there may be a differ - Fig . 424 . — Safety Valve directly loaded with Springs . ence of opinion as to the propor - a , Plate valve . b , Seat for valve . c , Covering plate . d D , Screw studs for adjusting the springs . tion which the working pressure e e , Volute springs . f , Lever ,…
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