Fluid pressure control device
US9797117B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 2013 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | Dec 24, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87177
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid pressure control device includes a switching valve configured to operate in conjunction with the control valve by the pilot pressure led through the pilot valve to switch work of the operation check valve. The switching valve includes a pilot chamber to which the pilot pressure is led, a spool that moves in accordance with the pilot pressure of the pilot chamber, a bias member that biases the spool in the valve closing direction, a collar detachably installed in the pilot chamber, and a piston slidably inserted into the collar, the piston being configured to receive the pilot pressure on a back surface thereof and give thrust force to the spool against bias force of the bias member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.