Pressure control valve (PCV) is implemented in internal combustion engine to regulate crankcase pressure. In this study, the performance of a diaphragm PCV valve is investigated numerically and experimentally. Firstly, numerical simulation is carried out using commercial code to predict the flow and pressure distribution inside the valve. Furthermore, downstream and upstream pressure of the val...

This paper presents a failure analysis on a failed intake valve in a gasoline engine. During an endurance test, an intake valve was broken and caused some damages on the piston. Material examinations (by a light microscope and also a scanning electron microscope) were conducted on the fracture surface of the intake valve shaft. Results showed that no pores or defects could be observed and the m...

Stiction is one of the most adverse non-linearities that can affect a control valve. It impacts both valve longevity and product quality. Currently available stiction compensation methods either reduce the amplitude of oscillation at a cost of increased frequency or require knowledge about process and valve models. In this study a novel stiction compensation scheme is developed which reduces bo...

OBJECTIVES We sought to determine the association of age with the change in quality of life (QOL) after valve surgery. BACKGROUND Improvement in QOL is one of the principal goals of valve surgery. These procedures are being done with increasing frequency for older patients. METHODS We prospectively studied 148 patients with aortic valve procedures and 72 patients with mitral valve procedure...

BackgroundVitamin K antagonists are the only oral anticoagulants approved to prevent valve thrombosis and valve-related thromboembolism in patients with mechanical heart valves. Whether an On-X aortic can be safely anticoagulated apixaban is unknown.MethodsPatients implanted at least 3 months before enrollment were randomly assigned receive 5 mg twice daily or warfarin (target international nor...