(under the class definition) Subject matter wherein the valve head is movably related to its stem or other immediately supporting element, there being no guide or link or other actuator in engagement with said stem or supporting element between the head and the movable connection, or with the head in such a way as to hold it in alignment with the seat.
(1) Note. The movable connection may be of the universal, swivel or pivot type, the purpose being to let the valve head seat squarely even if the stem or other supporting element is not accurately aligned, or to allow the valve head to slip past projection in seating.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40, for tilting concentric pilot valve in fluid servo-motor valve actuators.
157+, for relatively movable head and stem constructions for pressing heads to seats which permit alignment.
SEE OR SEARCH CLASS
137, Fluid Handling, 527.4, for direct-response, pivoted valves constructed to permit self adjustment.
