Hydraulically controlled water spool valve
US5513671A · kind A · utility
2Cited by
8References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Jul 13, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2516
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve, to control the injection of lubricant into a viscous material pump pipeline is disclosed. The valve is operated off a parameter of the viscous material pump such as hydraulic fluid pressure from one or both differential/popper teed lines for the pump. The preferred valve includes coaxial water and hydraulic oil spools on opposing ends of a rod, and two hydraulic signals are used to control water flow through two outlets, to properly feed water to two lubricant injectors. Inlets and outlets of the valve are all located along one surface, and an intermediate chamber is provided to receive any leakage past the rod seals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.