US PATENT SUBCLASS 137 / 82
PRESSURE MODULATING RELAYS OR FOLLOWERS


Current as of: June, 1999
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137 /   HD   FLUID HANDLING

82PRESSURE MODULATING RELAYS OR FOLLOWERS {3}
83  DF  .~> Jet control type
84  DF  .~> Plural series units
85  DF  .~> With counter-balancing pressure feedback to the modulating device {1}


DEFINITION

Classification: 137/82

(under the class definition) Apparatus which continuously varies or modulates a fluid in response to a varying control condition. The modulation is usually accompanied by varying a pressure bleed.

(1) Note. Only the subcombination, without a pressure responsive device, and a main valve controlled thereby is classified in this subclass; for the combination search appropriate succeeding subclasses, as indicated below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102, for pressure regulators which regulate by supply and exhaust valves to maintain a pre-set pressure.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type, appropriate subclasses for apparatus under this definition combined with the expansible chamber motor which is operated by the fluid pressure.

236, Automatic Temperature and Humidity Regulation, 79+, for temperature control systems utilizing pressure modulators to operate fluid pressure motors.

251, Valves and Valve Actuation,

25+, for apparatus which by means of a pilot valve controls the application of fluid pressure to an expansible chamber motor which in turn controls a main line valve.

399, Electrophotography,

237+, for liquid developer applied to a latent image within an electrophotos:graphic device.