(under the class definition) Fluid handling systems having (1) devices to render the system or parts thereof free from undesirable material, or (2) devices for lubricating the system or parts thereof by adding a lubricating medium to the stream of fluent material carried by the system or (3) devices for preventing leakage between the valve and a solid valve seat by introducing a liquid between the valve and its seat.
(1) Note. Cleaning means for this group requires the installation of additional means or connections to treat the apparatus, not the material being handled, or the manipulation of the system in some special way to secure the cleaning effect.
SEE OR SEARCH THIS CLASS, SUBCLASS:
15, for processes of cleaning.
247+, for liquid valves, i.e., those having liquid seats.
544+, for screens, filters, etc., for physically separating solid or unwanted materials from the material being handled. SEE OR SEARCH CLASS
222, Dispensing,
148+, for dispensers with installed cleaning means.
225, Severing by Tearing or Breaking,
12+, for installed beer pipe cleaners.
251, Valves and Valve Actuation,
355, for lubrication of actuators or parts of a valve in which the lubricant does not enter the flow path.
399, Electrophotography,
237+, for liquid developer applied to a latent image within an electrophotos:graphic device.
