.~> 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.
