Cage-type control valves are widely used in process industries, but cavitation can occur when the extreme high-pressure drop and large volume flow rate conditions. In this study, cage-type valve with improved cages is introduced, its characteristics compared other no dead zones regulation process. Two cage numbers four structures studied. Numerical simulations conducted, their accuracy validate...

In patients with mitral stenosis (MS), a free-floating ball thrombus in the left atrium (LA) is a very rare clinical manifestation, but has potentially catastrophic consequences such as fatal systemic emboli or total obstruction of the narrowed mitral valve orifice, often resulting in sudden death. In this report, we demonstrated a free-floating ball thrombus within the LA cavity and transient ...

was suspected because of phonocardiographic abnormalities. A prolonged interval from aortic closure to opening of the mitral ball suggested an impediment to movement of the ball. This was confirmed by catheterization and cinefluorography. At autopsy the impaired ball movement was found to be due to thrombus buildup on the outflow face of the mitral valve orifice. It is suggested that frequent p...

To study the vibration characteristics of deep-groove ball bearing, considering influence sliding, dynamic model DGB 6205 system is established in this paper. The includes movement bearing inner ring X and Y directions, rotation cage, each ball, revolution along radial direction ball. Based on model, differential equations motion are established, correctness verified by experiment. slip studied...

RECENT REPORTS of postoperative clinical and cardiac catheterization studies in patients after replacement of their aortic valves with a ball-valve prosthesis have included adequate clinical and hemodynamic measurements both at rest and during exercise.'-6 There is, however, little information regarding the competency of these valves as determined angiographically, since aortic root cineangiogr...