Sampling valve

US4195525A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• David A. George · Somers, US
• Bernard Strauss · Rockaway, US
• Irving H. Weisman · Flanders, US

Key dates

• Filing date: Mar 23, 1979
• Grant date: Apr 1, 1980
• Expiry date: Mar 23, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N1/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A fail-safe pneumatically operated by-pass sampling valve suitable for use n hazardous chemical processes utilizes a manually operated spool valve to initiate a pneumatically operated piston driven crank to rotate a sampling valve. The sampling valve withdraws a sample amount of fluid from a process line without disturbing normal process flow. A pneumatically connected spindle valve and a plurality of limiting valves are proximately positioned and operatively connected to the piston to automatically move the piston actuating member from a normally closed non-sampling position to a sampling position and then back to a normally closed non-sampling position.