Control system for gate-valves
US4029289A · kind A · utility
10Cited by
15References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1974 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Dec 11, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This invention concerns a control system for automatic safety gate-valves. The system comprises two hydraulically controlled pistons, the rod axis of which is parallel to the axis of the valve passage, and a connection by equal connecting rods, symmetrical to the axis of the gate-rod, between each of the piston rods and the gate-rod, with a release spring exerting a force contrary to the opening force acting on each piston. This system is specially designed for automatic gate-valves for oil installations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.