US Patent Class 251
VALVES AND VALVE ACTUATION-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
1.1  DF  BLOW-OUT PREVENTERS (I.E., COOPERATING SEGMENTS OF ANNULUS) {2}
3  DF  PATTERN TRACER CONTROLLED ACTUATOR
4  DF  TUBE COMPRESSORS {4}
11  DF  HEAT OR BUOYANCY MOTOR ACTUATED
12  DF  FLUID ACTUATED OR RETARDED {12}
64  DF  WITH NON-FLUID RETARDER
65  DF  PERMANENT OR CONSTANTLY ENERGIZED MAGNET ACTUATOR
66  DF  BIASED TRIP {5}
75  DF  WITH SNAP ACTION
76  DF  IMPACT TYPE ACTUATOR
77  DF  LOST MOTION BETWEEN ACTUATOR AND VALVE {3}
84  DF  VALVE HEAD MOVABLY CONNECTED FOR ACCOMMODATION TO SEAT {4}
89  DF  WITH MEANS FOR BLOCKING OR DISABLING ACTUATOR {6}
117  DF  WITH RESTRICTOR IN PARALLEL TO MAIN VALVE
118  DF  WITH MATERIAL GUIDE OR RESTRICTOR {6}
128  DF  WITH DETACHABLE ACTUATOR AND MEANS TO PREVENT LEAKAGE WHEN ACTUATOR IS DETACHED
129.01  DF  ELECTRICALLY ACTUATED VALVE {11}
142  DF  WITH CORRELATED FLOW PATH {9}
157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
205  DF  WITH SELECTIVE FLOW REGULATION {2}
210  DF  SEQUENTIAL OPENING OR CLOSING OF SERIAL PORTS IN SINGLE FLOW LINE (E.G., ANTI-SCORING)
211  DF  SERIAL ALTERNATELY CLOSED PORTS
212  DF  RELATIVELY MOVABLE VALVE ELEMENTS FORM SINGLE PORT CLOSURE (E.G., IRIS DIAPHRAGM)
213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
281  DF  BALANCED VALVES {2}
284  DF  LIMIT STOP {2}
289  DF  VALVE ACTUABLE FROM PLURAL POSITIONS
290  DF  PLURAL SELECTIVE NEUTRAL POSITIONS FOR VALVE OR ACTUATOR
291  DF  DETACHABLE ACTUATOR {1}
293  DF  EXTENSION FOR ACTUATOR
294  DF  FLEXIBLE ACTUATOR (E.G., BOWDEN WIRE; CHAIN)
295  DF  PEDAL ACTUATOR
296  DF  PLURAL MOTIONS OF ACTUATOR
297  DF  WITH FRICTION DETENT
298  DF  PIVOTED VALVES {3}
304  DF  ROTARY VALVES {5}
318  DF  RECIPROCATING VALVE {7}
335.1  DF  HERMETIC FLEXIBLE WALL SEAL FOR ACTUATOR {2}
336  DF  BIASED VALVE {2}
339  DF  VALVE ACTUATOR EXTENDING THROUGH FLUID INLET OR OUTLET
340  DF  VALVE ACTUATOR SURROUNDING PIPE, INLET OR OUTLET
341  DF  VALVE ACTUATOR IS VALVE CASING OR EXTENSION THEREOF {5}
349  DF  VALVE ACTUATOR IS INLET OR OUTLET {5}
355  DF  WITH ACTUATION LUBRICATING MEANS
356  DF  VALVE {5}
369  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  VALVES WITH O-RINGS
901  DF  CURTAIN TYPE VALVES
902  DF  SPRINGS EMPLOYED AS VALVES
903  DF  NEEDLE VALVES
904  DF  SNAP FIT PLUG VALVES
905  DF  MOVABLE COIL ELECTRICAL ACTUATOR (E.G., VOICE COIL)