Patent · US Expired

Extraction valve head for tanks

US4903722A · kind A · utility

7Cited by

5References

7Claims

0Family size

Assignee

MERCK PATENT GESELLSCHAFT MIT BESHRANK TER HAFTUNG · DE

Inventors

Frank Joseph · Gernsheim, DE
Holger Jurgensen · Aachen, DE

Key dates

Filing date	Mar 30, 1989
Grant date	Feb 27, 1990
Priority date	—
Expiry date	Mar 30, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87338
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An extraction valve head for a tank for high-purity and/or toxic liquid chemicals has an inlet valve for a filler gas, an outlet valve and a purging valve, which closes a bypass between a gas inlet line and an extraction line. The valves are configured as metal diaphragm valves and are fitted in a common metallic valve housing block. All valve seals of the valves are arranged in close spatial proximity to one another in the valve housing block.

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