Supply control valve with integral pressure limiter
US4540020A · kind A · utility
Inventor
Key dates
| Filing date | Apr 20, 1984 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Apr 20, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a pilot operated fluid supply valve the usual control pressure applied to the control surface of a main supply valve can be interrupted by a fluid switch and replaced with a pressure which closes the main supply valve. The fluid switch is responsive to the load pressure in the load port of the main valve. The fluid switch may include a rocker arm actuated by a diaphragm in fluid communication with the load port. In one system, main supply and waste diaphragm valves are controlled by a pilot valve and a pressure reversing valve, and the fluid switch is positioned between one of those valves and the main supply valve. In another system, the main valves are controlled by a dual output pilot valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.