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Class Information
Number: 251/625.32
Name: Valves and valve actuation >
Description:










Sub-classes under this class:

Class Number Class Name Patents
251/1.1 Blow-out preventers (i.e., cooperating segments of annulus) 112
251/11 Heat or buoyancy motor actuated 380
251/117 With restrictor in parallel to main valve 100
251/118 With material guide or restrictor 280
251/12 Fluid actuated or retarded 70
251/128 With detachable actuator and means to prevent leakage when actuator is detached 19
251/129.01 Electrically actuated valve 585
251/142 With correlated flow path 23
251/157 With means to increase head and seat contact pressure 8
251/205 With selective flow regulation 248
251/210 Sequential opening or closing of serial ports in single flow line (e.g., anti-scoring) 100
251/211 Serial alternately closed ports 15
251/212 Relatively movable valve elements form single port closure (e.g., iris diaphragm) 180
251/213 Mechanical movement actuator 30
251/281 Balanced valves 18
251/284 Limit stop 149
251/289 Valve actuable from plural positions 31
251/290 Plural selective neutral positions for valve or actuator 14
251/291 Detachable actuator 205
251/293 Extension for actuator 93
251/294 Flexible actuator (e.g., bowden wire; chain) 202
251/295 Pedal actuator 76
251/296 Plural motions of actuator 21
251/297 With friction detent 286
251/298 Pivoted valves 224
251/3 Pattern tracer controlled actuator 5
251/304 Rotary valves 175
251/318 Reciprocating valve 107
251/335.1 Hermetic flexible wall seal for actuator 42
251/336 Biased valve 27
251/339 Valve actuator extending through fluid inlet or outlet 196
251/340 Valve actuator surrounding pipe, inlet or outlet 84
251/341 Valve actuator is valve casing or extension thereof 24
251/349 Valve actuator is inlet or outlet 53
251/355 With actuation lubricating means 67
251/356 Valve 124
251/369 Miscellaneous 16
251/4 Tube compressors 240
251/64 With non-fluid retarder 141
251/65 Permanent or constantly energized magnet actuator 626
251/66 Biased trip 49
251/75 With snap action 110
251/76 Impact type actuator 37
251/77 Lost motion between actuator and valve 202
251/84 Valve head movably connected for accommodation to seat 70
251/89 With means for blocking or disabling actuator 94
251/900 Valves with o-rings 272
251/901 Curtain type valves 125
251/902 Springs employed as valves 33
251/903 Needle valves 74
251/904 Snap fit plug valves 59
251/905 Movable coil electrical actuator (e.g., voice coil) 16


Patents under this class:

Patent Number Title Of Patent Date Issued











 
 
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