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Class Information
Number: 251/140
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)	81
251/11	Heat or buoyancy motor actuated	322
251/117	With restrictor in parallel to main valve	89
251/118	With material guide or restrictor	241
251/12	Fluid actuated or retarded	40
251/128	With detachable actuator and means to prevent leakage when actuator is detached	14
251/129.01	Electrically actuated valve	459
251/142	With correlated flow path	11
251/157	With means to increase head and seat contact pressure	6
251/205	With selective flow regulation	220
251/210	Sequential opening or closing of serial ports in single flow line (e.g., anti-scoring)	95
251/211	Serial alternately closed ports	12
251/212	Relatively movable valve elements form single port closure (e.g., iris diaphragm)	159
251/213	Mechanical movement actuator	20
251/281	Balanced valves	16
251/284	Limit stop	133
251/289	Valve actuable from plural positions	29
251/290	Plural selective neutral positions for valve or actuator	11
251/291	Detachable actuator	184
251/293	Extension for actuator	77
251/294	Flexible actuator (e.g., bowden wire; chain)	188
251/295	Pedal actuator	69
251/296	Plural motions of actuator	18
251/297	With friction detent	258
251/298	Pivoted valves	184
251/3	Pattern tracer controlled actuator	4
251/304	Rotary valves	146
251/318	Reciprocating valve	78
251/335.1	Hermetic flexible wall seal for actuator	34
251/336	Biased valve	19
251/339	Valve actuator extending through fluid inlet or outlet	170
251/340	Valve actuator surrounding pipe, inlet or outlet	71
251/341	Valve actuator is valve casing or extension thereof	17
251/349	Valve actuator is inlet or outlet	48
251/355	With actuation lubricating means	54
251/356	Valve	107
251/369	Miscellaneous	13
251/4	Tube compressors	202
251/64	With non-fluid retarder	117
251/65	Permanent or constantly energized magnet actuator	541
251/66	Biased trip	42
251/75	With snap action	109
251/76	Impact type actuator	36
251/77	Lost motion between actuator and valve	169
251/84	Valve head movably connected for accommodation to seat	63
251/89	With means for blocking or disabling actuator	81
251/900	Valves with o-rings	257
251/901	Curtain type valves	119
251/902	Springs employed as valves	32
251/903	Needle valves	68
251/904	Snap fit plug valves	55
251/905	Movable coil electrical actuator (e.g., voice coil)	14