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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)	101
251/11	Heat or buoyancy motor actuated	364
251/117	With restrictor in parallel to main valve	98
251/118	With material guide or restrictor	275
251/12	Fluid actuated or retarded	61
251/128	With detachable actuator and means to prevent leakage when actuator is detached	17
251/129.01	Electrically actuated valve	553
251/142	With correlated flow path	20
251/157	With means to increase head and seat contact pressure	8
251/205	With selective flow regulation	243
251/210	Sequential opening or closing of serial ports in single flow line (e.g., anti-scoring)	97
251/211	Serial alternately closed ports	15
251/212	Relatively movable valve elements form single port closure (e.g., iris diaphragm)	178
251/213	Mechanical movement actuator	30
251/281	Balanced valves	18
251/284	Limit stop	143
251/289	Valve actuable from plural positions	30
251/290	Plural selective neutral positions for valve or actuator	14
251/291	Detachable actuator	199
251/293	Extension for actuator	90
251/294	Flexible actuator (e.g., bowden wire; chain)	200
251/295	Pedal actuator	73
251/296	Plural motions of actuator	19
251/297	With friction detent	279
251/298	Pivoted valves	213
251/3	Pattern tracer controlled actuator	5
251/304	Rotary valves	171
251/318	Reciprocating valve	98
251/335.1	Hermetic flexible wall seal for actuator	41
251/336	Biased valve	25
251/339	Valve actuator extending through fluid inlet or outlet	190
251/340	Valve actuator surrounding pipe, inlet or outlet	82
251/341	Valve actuator is valve casing or extension thereof	23
251/349	Valve actuator is inlet or outlet	52
251/355	With actuation lubricating means	64
251/356	Valve	121
251/369	Miscellaneous	16
251/4	Tube compressors	234
251/64	With non-fluid retarder	135
251/65	Permanent or constantly energized magnet actuator	601
251/66	Biased trip	46
251/75	With snap action	110
251/76	Impact type actuator	36
251/77	Lost motion between actuator and valve	195
251/84	Valve head movably connected for accommodation to seat	69
251/89	With means for blocking or disabling actuator	92
251/900	Valves with o-rings	271
251/901	Curtain type valves	124
251/902	Springs employed as valves	33
251/903	Needle valves	71
251/904	Snap fit plug valves	58
251/905	Movable coil electrical actuator (e.g., voice coil)	16