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Class Information
Number: 137/221
Name: Fluid handling > Larner-johnson type valves; i.e., telescoping internal valve in expanded flow line section > Internal servo-motor with internal pilot valve
Description: Flow control devices in which a controlled motor device comprising a pilot operated or servo-mechanism is involved, the motor device and its pilot or control valve being located within the internal part of the valve, i.e., the part comprising the telescoping support and the needle or movable valve head lying within the flow passage.

Sub-classes under this class:

Class Number Class Name Patents
137/222 Pilot controlled passage in nose or needle 4

Patents under this class:

Patent Number Title Of Patent Date Issued
8656941 Flow control valve Feb. 25, 2014
8353310 Valves having removable internal actuation mechanisms Jan. 15, 2013
8136543 Axial flow control valves having an internal actuator Mar. 20, 2012
8113228 Suction valve Feb. 14, 2012
5417238 Tillage implements May. 23, 1995
5303778 On-off type sprinkler Apr. 19, 1994
4732189 Fast opening valve Mar. 22, 1988
4429709 Cascade-based method and device for fluid handling and measurement Feb. 7, 1984
4254634 Control valve to be employed for refrigerator and air conditioner Mar. 10, 1981
3974849 Diaphragm valves Aug. 17, 1976

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