Check valve
US4662392A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | May 1, 1986 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | May 1, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/791
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a subsurface positive displacement pump used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles, a ball check valve comprising a valve ball and a valve seat assembly wherein the valve seat assembly comprises a hollow cylindrical body defining an orifice through which pumped fluid passes, the hollow cylindrical body being provided with a recess on the surface facing the valve ball in the region defining the orifice wherein an insert which forms the actual valve seat for the ball valve is secured in the recess. The insert is formed of a material having a hardness greater than the hardness of the material from which the cylindrical body is formed and the material from which the valve ball is formed is characterized by a high resiliency, a modulus of elasticity of between 0.1.times.10.sup.6 psi to 15.times.10.sup.6 psi and a hardness greater than that of the hollow cylindrical body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.