| 摘要 |
<p>PURPOSE: To treat the liquid of various viscosity in a gap which is smoothly increased, by not discontinuously diverging a valve device on any position along an annular surface portion, and gradually diverging the same outwardly in the axial direction at a gradually increasing angle to the axis of a housing. CONSTITUTION: An internal surface of a housing 1 is continued downwardly from a valve seat 9 as a circular cylindrical bore surface area 10' with a size same as a surface area facing to an upper part of a shoulder part 8. The circular cylindrical bore surface area 11 and a radial direction area 13 are continued from the shoulder part 8, and a truncated conical surface area 13 which is diverged upwardly at an angle of 40-60 deg. is continued. Then a series of truncated conical surface areas 14, 15, 16 and 17' are continued upwardly, and a circular cylindrical bore surface area 18 is a final point at an apex. An internal surface formed from the surface area 18 to the areas 17 and 14 is widened outwardly at a gradually increasing angle to an axis of a housing. Whereby the valve device can treat the liquid of wide-ranging viscosity without the comparatively large stroke of a valve member 2.</p> |
