| 摘要 |
<p>A valve body for a spherical-shutter valve for gases or fluids is disclosed, said body consisting of two hemispherical hoods enclosing the shutter and to be welded along their great circle, two couples of half-rings being welded in symmetrical positions relative to the sphere equator to provide sealing action: an annular channel is furthermore provided in the meridian direction immediately beneath the welding seam line to prevent welding material from entering the valve interior and to house a photographic film to take nondestructive control pictures.</p> |
