Patent ID: 11885438
Assignee: LANCASTER FLOW AUTOMATION LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. An orifice plate for a choke valve including a valve body having an internal cavity, the orifice plate comprising:
a center point and being rotatable about a center axis extending longitudinally through the center point when the orifice plate is disposed within the internal cavity of the valve body; and
a first aperture extending through a face of the orifice plate, the first aperture defining at least a first equi-incremental phase region, the first aperture being spaced away from the center point of the orifice plate,
wherein:
rotation of the orifice plate with respect to the center point effects transitioning of the orifice plate among a first plurality of open states, including:
rotation of the orifice plate in a first direction with respect to the center point effects an equal incremental increase in fluid flow per degree of rotation in an open area of the first equi-incremental phase region and
an equal incremental decrease in fluid flow per degree of rotation in the open area of the first equi-incremental phase region during rotation of the orifice plate in a second direction opposite the first direction;

wherein:
the first aperture further includes a semi-circular section extending from the first equi-incremental phase region and defining a second equi-incremental phase region.