| 摘要 |
<p>PCT No. PCT/FR87/00119 Sec. 371 Date Dec. 14, 1987 Sec. 102(e) Date Dec. 14, 1987 PCT Filed Apr. 13, 1987 PCT Pub. No. WO87/06320 PCT Pub. Date Oct. 22, 1987.A valve which works without friction is provided which includes a movable obturating member and an annular seat. The annular seat is secured to a base by means of a support. The obturating member, preferably a ball, is set in a support which is fixed in the central opening of a substantially flat circular flexible membrane. The circular membrane is secured in a prestressed condition, in a plane parallel to the plane of the annular seat with the obturating ball member coaxial to the seat, by welding the contour of the membrane to the base. The membrane is mechanically isotropic so as to be radially rigid in the plane thereof and deformable in the direction perpendicular to its plane. Deformation of the circular membrane in directions perpendicular to its plane cause the obturating ball member to move into and away from the annular seat to interrupt and allow fluid flow therethrough. The prestressed condition of the membrane exerts a restoring force which causes the obturating ball member to seat in the annular seat. Deformation of the circular membrane is accomplished without any friction between the obturating ball member and its support, the contour of the membrane and the base and the obturating ball member and the annular seat.</p> |
