Hydraulic elevator pressure relief valve
US5289901A · kind A · utility
9Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Aug 3, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hydraulic elevator pressure relief valve is activated if a pilot valve disposed therein senses an excessive pressure build up within a hydraulic elevator system. The pilot valve opens once excess fluid pressure force is detected. A main piston then facilitates communication between a solenoid valve disposed within the valving system and the drain pressure thereby closing a check valve and thus stopping an elevator car from further movement. The main piston further ports the excess fluid pressure force from the system to drain pressure, thus stabilizing the fluid pressure force therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.