A fail-safe pneumatically operated by-pass sampling valve suitable for use in 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.
申请公布号
US4195525(A)
申请公布日期
1980.04.01
申请号
US19790023109
申请日期
1979.03.23
申请人
U S OF AMERICA ARMY SECRETARY
发明人
GEORGE, DAVID A;STRAUSS, BERNARD D;WEISMAN, IRVING H