.~ With separate connected fluid reactor surface {8}
508
.~.~ Valve seat or external sleeve moves to open valve
DEFINITION
Classification: 137/508
(under subclass 494) Apparatus in which the separate reactor surface comprises a movable member in which is located an orifice to be controlled, the closure for which is either fixed with respect to the valve casing, or has movement which is different from or less than the possible movement of the orifice member, whereby the controlled orifice is opened by movement of the orifice member beyond a predetermined point.
(1) Note. Certain valves included herein have a movable flow passage forming tubular member or sleeve, the end surface of which comprises a seat or passage closing part to
control fluid entering the sleeve flow path, and also comprises the surface exposed to and reacting to the fluid pressure. Since these sleeves may or may not have the end surface extended by a flange or diaphragm without changing their other characteristics, all such devices have been classified together herein, regardless of the presence or absence of means to increase the exposed end area.
SEE OR SEARCH THIS CLASS, SUBCLASS:
511+, for annular type pressure responsive valves which have an annular cooperating seat or flow passage, but which do not meet the requirements of (1) Note as to reactor surface components; i.e., the exposed surface could not be extended by enlarging the casing and increasing the area of the exposed part of the movable member.
