Gate valve
US5377955A · kind A · utility
Inventor
Key dates
| Filing date | Feb 15, 1994 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Feb 15, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49421
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gate valve comprising a valve body, a gate, a bonnet assembly and an actuator assembly. The gate having a closure area, a flow opening extending through the gate, and a recess circumscribing the flow opening and the closure area having a material disposed therein and case hardened to form a wear resistant sealing surface about the flow opening and the closure area having a hardness greater than about 50 Rockwell. The gate being press fitted between a pair of seat rings such that the sealing surface remains in sealing engagement against the seat rings to provide a substantially fluid tight seal when the gate is in an open and closed position. The actuating assembly is connected to the gate for reciprocally moving the gate across the flow bore between the open position and the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.