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Class Information
Number: 137/489.3
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Fluid pressure type > Choked or throttled pressure type > Loose fitting piston
Description: Devices in which the unvalved passage is between the piston and the cylinder walls.

Patents under this class:

Patent Number Title Of Patent Date Issued
6564827 Shut-off device for the filling device of a pressure tank May. 20, 2003
4651768 Servovalve for pipe flange connection Mar. 24, 1987
4366834 Back-flow prevention valve Jan. 4, 1983
4192344 Automatic emergency stop apparatus against counter flow and counter fire of gas bodies Mar. 11, 1980
3962884 Piloted freeze throttling valve Jun. 15, 1976
3942333 Suction throttling valve Mar. 9, 1976

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