ii) The control valve Manufacturer can only state the Inherent valve characteristics, which refer to the flowrate (F) – valve travel position (m or Z) relationship, when the pressure drop across the control valve (DPV) is constant. Note that the pressure drop across the control valve (DPV) can be almost constant only if the piping system pressure drop (DPS) is concentrated at the control valve ...

The paper describes tests carried out on disc valves in which the valve seat was withdrawn from the valve wh).le a pressure difference existed across the valve. Simultaneous measurements were made of the force on the valve, the pressure in the plenum chamber and the displacement of the seat from the valve. Force measurements are compared with values of force measured during continuous flow cond...

OBJECTIVES The goal of this study was to compare long-term survival and valve-related complications between bioprosthetic and mechanical heart valves. BACKGROUND Different heart valves may have different patient outcomes. METHODS Five hundred seventy-five patients undergoing single aortic valve replacement (AVR) or mitral valve replacement (MVR) at 13 VA medical centers were randomized to r...

Partial muscular inter-ventricular septal defect (VSD) or Pacman heart is a rare congenital or occasionally acquired anomaly. Concurrent Pacman heart and Shone's complex are extremely rare and have never been reported until now. We described a 37-year-old male patient with congenital Pacman heart, flail mitral valve (FMV), and a history of multiple congenital anomalies, including subvalvular ao...

We developed a novel discharge valve characters usmg the stopper to obtain the high efficiency reciprocating compressor for refrigerators. Generally, the sticky force occurred due to the shape of valve, stopper and oil between the valve and valve seat changed the process of valve motion and valve dynamics of compressor. In this paper, we can measure the characteristics of the sticky force and d...

conclusions surgical repair of the congenital mv disease yields acceptable early and intermediate-term satisfactory valve function and good survival at intermediate-term follow-up. strong predictors for poor surgical outcome and death were age smaller than 1 year, weight smaller or equal than 6 kg, and associated cardiac anomalies such as pulmonary stenosis. objectives the aim of this study was...

OBJECTIVES The present study evaluates the long-term course of aortic valve disease and the need for aortic valve surgery in patients with rheumatic mitral valve disease who underwent mitral valve surgery. BACKGROUND Little is known about the natural history of aortic valve disease in patients undergoing mitral valve surgery for rheumatic mitral valve disease. In addition there is no firm pol...

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