Apparatus for regulating fluid flow through plastic tubing
USRE31584E · kind E · reissue
Inventor
Key dates
| Filing date | Aug 10, 1981 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Aug 10, 2001 |
Classification
- Technology area (CPC —)General
Abstract
The rate of flow of a fluid through plastic tubing is varied by clamping a portion of a circumferential section of the tube wall with sufficient force to fully close that part of the passage between the clamped wall portions, permitting fluid flow only through the resulting, remaining open cross-sectional area. Cold flow of the plastic material of the clamped portion of the tubing wall, such as might otherwise effect a change in the remaining cross-sectional flow area, is prevented or minimized by rigidly confining the clamped section. To adjustably vary the flow rate, the operative, passage-defining wall section of the tubing is varied by uniformly varying the ratio of the section of clamped tubing, and the remaining, operative wall portion of the tubing, or by deforming the operative wall portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.