Valve seat assembly
US4878651A · kind A · utility
52Cited by
7References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/207
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A through conduit gate valve apparatus having a valve seat assembly that is field maintainable and which prevents the occurrence of pressure lock is disclosed. Each valve seat assembly includes a retainer ring fixed in the valve body and a pressure responsive seat ring that seals with the gate member. The seat ring is responsive to fluid pressure in the valve flow passageways for maintaining and enhancing the face seal with the gate and to fluid pressure in the valve chamber for automatically venting the valve chamber to prevent occurrence of a pressure lock condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.