Full flow bypass valve
US4083409A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1977 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | May 2, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/001
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A full flow bypass valve comprising mutually telescoping inner mandrel and outer housing members with hydraulic impedance means therebetween to provide a predetermined time delay when the members are relatively telescoped in a first direction and to provide substantially unrestricted relative telescoping movement between the members in the opposite direction. A valve mechanism provides simultaneous closure of bypass ports through the wall of the housing member when the mandrel and housing members reach full telescopic contraction. Pressure responsive means are provided for maintaining the bypass valve in a closed position regardless of internal or external pressures applied thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.