動力噴霧機のポンプ特性に関する研究 (第2報)

高圧時における弁の静特性

抄録

The static characteristics of valves which supplied the pressure head varied from 0.1 to 15kg/cm², were described in this report. The same valves which used in previous report were used.
The discharge Q and lifting force P were measured at the various valve lift h under the various pressure head H.
From these experimental data, the non-dimensional discharge q₀, coefficient of discharge C, coefficient of resistance ζ which used in previous report and non-dimensional lifting force P₀ were computed and expressed as functions of opening ratio h/d₀., (d₀: valve-port diameter)
The following results were obtained.
1) The non-dimensional discharge q₀ increased linearly with the increase of opening ratio h/d₀ in all valves.
2) The coefficient of discharge C was the maximum value in the range of opening ratio h/d₀=0.02-0.03, but not the maximum value in the ball valve.
3) On the coefficient of resistance ζ, the ball valve was found the inflence of valve-port diameter.
4) The non-dimensinal lifting force P₀ was the minimum value at opening ratio h/d₀=0.04 in the flat valve, and was the minimum value in the range of opening ratio h/d₀=0.12-0.13 in the conical valve. On the ball valve, there was not the minimum value.