Load-holding brake valve
US6098647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Aug 28, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2544
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulically controllable valve for double-acting consumers that in the lowering mode drains off a flow of load volume from connection B to connection A in throttled fashion. To that end, the valve has a valve seat (5), which communicates with a sealing face (4) of a main piston (3). A pilot piston (8) is guided concentrically in the main piston (3) and communicates with a sealing face (7) to a pilot valve seat (6) in the main piston; the main piston (3) and the pilot piston (8) are held on the valve seat (5) and pilot valve seat (6), respectively, by the load pressure and/or by spring force. On the pressure-relieved side, the pilot piston (8) has a piston shank (9), guided in a seat bore, with a continuously decreasing throttling action and in particular throttle grooves (10), which form a throttle restriction. On hydraulic triggering, the pilot piston (8) is axially displaceable by means of an opening piston (20), so that the pilot valve (5, 6) opens, and a load volume flow flows out of a pilot chamber (15), receiving the springs, via the throttle restriction. The resultant load pressure reduction causes an axial displacement of the main piston (3) and the opening of the valve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.