Patent · US Expired

Method of and apparatus for control of saftey valves

US4911192A · kind A · utility

17Cited by

4References

17Claims

0Family size

Inventors

Johannes Hartfiel · Mannheim, DE
Manfred Schmitt · Munich, DE

Key dates

Filing date	Jun 3, 1988
Grant date	Mar 27, 1990
Priority date	—
Expiry date	Jun 3, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86389
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method of and apparatus for controlling a system safety valve comprising an operating cylinder for displacing a valve closing member, and in which outflow and inflow solenoid valves communicating with the operating cylinder for guiding hydraulic fluid out of and into the operating cylinder, respectively, are electronically controlled in accordance with the system pressure to enable stepwise opening or closing of the safety valve.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.