US PATENT SUBCLASS 251 / 12
FLUID ACTUATED OR RETARDED

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12FLUID ACTUATED OR RETARDED {12}
14  DF  .~> Fluid and non-fluid actuators
15  DF  .~> Compulsory cut-off after flow period {6}
24  DF  .~> Venturi or line flow effect assisted
25  DF  .~> Pilot or servo type motor {8}
48  DF  .~> Dashpot or fluid controlled retarder or timer {5}
56  DF  .~> Plural operations (e.g., lifting and rotating rotary valve)
57  DF  .~> Fluid link or column actuator
58  DF  .~> With mechanical movement between actuator and valve
59  DF  .~> Rotary or oscillatory motor
60  DF  .~> With adjustable limit stop for actuator
61  DF  .~> Flexible wall expansible chamber reciprocating valve actuator {2}
62  DF  .~> Piston type expansible chamber reciprocating valve actuator {3}

DEFINITION

Classification: 251/12

(under the class definition) Subject matter in which the opening or closing movement of the valve is produced or modified by the reactive force of a fluid acting against a portion of the actuating means.

(1) Note. All fluid displacement devices inherently require a period of time to fill or empty the same, the period depending upon the relative sizes of the displacement devices

and the flow passages thereto as well as the pressures producing the flow. As a result, many of the disclosures of this and indented subclasses disclose and make use of this time delay, such as in the case of the "flush" valves, but other disclosures having equivalent constructions make no reference to such time delay. The definitions of this and indented subclasses have been drawn with a view to bring together inherently related disclosures irrespective of the mode of describing the function of the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

73, for biased trip valves with fluid pressure actuation of the trip.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices, appropriate subclasses for an expansible chamber device, per se. 123, Internal-Combustion Engines,

90.12, thru 90.14, for poppet valve operating mechanism which is fluid actuated.

137, Fluid Handling,

12, and 14 for process of this class involving pressure control, subclass 58 for speed responsive valve control with fluid servo-motor, subclass 81 for atmospheric pressure responsive control, subclasses 82+ for pressure modulating relays or followers, subclass 105 for pulsation responsive pilot valves in suction pulsators, subclasses 219+ for Laner-Johnson valves, especially subclasses 221+ for those having an internal servo-motor with internal pilot valve, subclasses 413+ for fluid pressure type servo relay control of or response to liquid level and subclasses 455+ for valves responding to change in line pressure and/or flow conditions to control the flow, especially subclasses 488+ for fluid pressure type servo-motor control of the valve, subclasses 596.14+ for pilot actuated supply and exhaust valves, subclass 596.18 for fluid motor actuated supply and exhaust valves, subclass 625.6 for pilot actuated supply and exhaust multiway valve units, and subclass 625.66 for fluid motor actuated supply and exhaust multiway valve units.

222, Dispensing,

59+, for dispensers having flow meter operated cut-offs, subclass 334 for fluid motor operated discharge assistants in dispensers and subclass 504 for motor operated dispenser outlet elements.