نتایج جستجو برای: pressure relief valve
تعداد نتایج: 531950 فیلتر نتایج به سال:
Traditional methods of testing such valves in BP Amoco group companies conform to the recognised industry standard API 576, and the usual procedure requires that all PSVs are removed from the plant periodically so that their condition can be evaluated in a workshop. Prior tore-installation valves are then "pop" tested on a test bench. On steam boilers the bench set pressure must also be proven ...
BACKGROUND After aortic valve replacement, left ventricular afterload is often characterized by the residual valve obstruction. Our objective was to determine whether higher systemic arterial afterload-as reflected in blood pressure, pulsatile and resistive load-is associated with adverse clinical outcomes after transcatheter aortic valve replacement (TAVR). METHODS AND RESULTS Total, pulsati...
With the advent of transcatheter aortic valve implantation (TAVI), many AS patients, formerly considered inoperable, can receive effective treatment. The relief of the left ventricular pressure overload could lead, in some cases, to the occurrence of dynamic intracavity pressure gradients (DIG) with deleterious clinical impact. This phenomenon resembles the physiology seen in hypertrophic obstr...
Hemodynamic performance of the CarboMedics heart valve in the aortic position and its clinical impacts were investigated in 126 consecutive patients. The actuarial survival rates of patients who had undergone isolated aortic valve replacement and concomitant aortic and mitral valve replacement were 82.6+/-5.7% and 71.0+/-9.2% at 8 years, respectively. Morbid events were rare, and almost all lat...
Performance Evaluation of Magnetorheological Damper Valve Configurations Using Finite Element Method
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 slide valve-type direct-acting relief valve with external orifice (SVTDARVWEO) is widely used in hydraulic systems, and its response characteristics are influenced by key factors. It of great significance to carry out research on the influencing factors SVTDARVWEO. working principle SVTDARVWEO analyzed present study. simulation model established using AMESim. influence diameter, viscosity c...
It is very well known that the use of a load-holding valve (LHV) in hydraulic system introduces additional energy consumption. This article presented simplified graphical method for analyzing power requirements systems equipped with valves overrunning load control. The helps to understand performance during actuator movement. In addition, it allows visualization influence on overall consumption...
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