Pneumatic-hydraulic control valve
US11572963B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2021 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Nov 4, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K2200/501
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pneumatic-hydraulic control valve includes a valve base and a valve stem movably disposed in the valve base. A first inner oil guiding hole of the valve stem communicates with a first outer oil guiding hole of the valve base. A second inner oil guiding hole of the valve stem does not communicate with a second outer oil guiding hole of the valve base when the valve stem is closed, and communicates with the second outer oil guiding hole of the valve base when the valve stem is opened. Further, the valve stem has a first stressed portion for bearing a fluid closing force and a second stressed portion for bearing a fluid opening force. The outer diameter of the first stressed portion is larger than that of the second stressed portion. Thus, the present invention reduces a valve opening force without affecting the sealing effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.