(under subclass 11.1) Device wherein significance is attributed to means to change the character of a flowing fluid prior to its engagement with the sand.
(1) Note. The character of a flowing fluid may be changed by altering the flow rate, the location of the flow, etc.
(2) Note. A device comprising a mere valve or control means located upstream of the trap which changes the character of the fluid flow is not included in this subclass unless particular structure of the valve or control means is provided or unless particular valve or control means operation or structure is recited.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11.2, for fluid delivery devices having a sand-trap and multiple fluid inlets for propelling sand to or though a delivery pipe, particularly those devices wherein fluid flow from the two inlets is adjusted interdependently.
