Characteristics of Disc Valves of High-Lift Safety-Valve Type : Experimental Research on Disc Valves, 4th Report

Abstract

The characteristics of flat-seated valves provided with guide cylinders as used in some types of safety valve are treated in this paper. Discharging water through a valve (39 mm in diam.) under a constant head of about 2 meters, either into the air, or into the vessel filled with water, we measured the discharge and lifting force for each valve lift, thus observing the performance of the guide cylinder. In the next place, to eliminate the effect of the cylinder edge, we kept the guide cylinder always a little higher than the valve, while the water was issued into the air. Under these conditions we measured the discharge and the lifting force as well as the angle of jet for each of the flat-seated valves of nine kinds, widely differing in diameter ratios. The relations between the quantities thus obtained were made clear by the use of the momentum equation.