REGULATION OF STEAM . 127 pressure of the steam acting on the valve and the pressure imparted b y the springs , which can be adjusted to the greatest nicety . This … Figs . 6 g , 70 . — Slide Valve by the Author . valve requires no packing rings , and should priming occur the cylinders are instantly relieved from the water . This roller motion should work easily and with less friction than the arrangements with packing rings on the back . Should the boiler…
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