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Class Information
Number: 137/465
Name: Fluid handling > Line condition change responsive valves > Safety cut-off requiring reset > Fluid counter-biased or unseated valve > With mechanical stop against reopening
Description: Apparatus including a mechanical means which prevents the valve from reopening after seating or closing in the event the fluid pressure is reestablished.

Patents under this class:

Patent Number Title Of Patent Date Issued
8028715 Check valve for vacuum sewage pipe and vacuum sewage system Oct. 4, 2011
6880767 Two trigger safety circuit for water cleaning lance Apr. 19, 2005
5860446 Method and apparatus for safely controlling fluid flow Jan. 19, 1999
5709239 Automatic shut-off safety device Jan. 20, 1998
4224962 Change valve Sep. 30, 1980
4044790 Self re-arming valve Aug. 30, 1977
3933444 Flash back arrestor Jan. 20, 1976

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