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...

Although the Codman-Hakim programmable valve is one of most popular shunt systems used in the clinical practice for the treatment of hydrocephalus, malfunctions related with this system have been also reported which lead to underdrainage or overdrainage of the cerebrospinal fluid. While obstruction of the ventricular catheter by tissue materials or hematoma and catheter disconnection are relati...

A mathematical model and simulation analysis on main control valve mechanism of LNG ship steam turbine are carried out. A reasonable modeling division of main control valve mechanism is achieved in accordance with the idea of modular modeling, and all the models are established respectively. The modeling division includes cam lifting mechanism, oil actuator and double-valve body. The state spac...

The main purpose of this paper is to study various configurations of a magnetorheological (MR) damper valve and to evaluate their performance indices typically dynamic range, valve ratio, inductive time constant and pressure drop. It is known that these performance indices (PI) of the damper depend upon the magnetic circuit design of the valve. Hence, nine valve configurations are considered fo...

The suitability of artiicial neural networks (ANNs) for detecting fault conditions in pneumatic control valve actuators is investigated. Speciically, the ability of a neural network to act as a predictor of correct valve behaviour is examined. Experimental results indicate that standard network architectures are unsuitable for temporal prediction of non-linear system behaviour. An original recu...

Butterfly valves are commonly used as control equipments in applications where the pressure drops required of the valves are relatively low. As shutoff valve (on/off service) or throttling valves (for flow or pressure control), the higher performance and the better precision of butterfly valves are required. Thus it’s more and more essential to know the flow characteristic around the valve. Due...

prolapsed mitral valve syndrome is a common, benign disorder with prevalence of %0.3-6 in population. this syndrome also is known as barlows syndrome and flaapy mitral valve syndrome. prolapsed mitral valve is the dropping of one or two mitral valve leaflet(s) into the left atrium during ventricular systole. this malformation leads to incomplete closing of mitral valve and regurgitates the bloo...

Abstract In order to improve the water shooting stability of amphibious vehicle weapon, recoil motion differential equation weapon is established by analyzing force during shooting. structure valve-controlled device and optimal strategy grey predictive fuzzy control are determined, resistance characteristic curves with or without servo valve different voltages analyzed numerically. And attitude...