Abstract
Although check valves have attracted a lot of attention, work has rarely been completed done when there is a compressible working fluid. In this paper, the swing check valve and the tilting check valve flowing high-temperature compressible water vapor are compared. The maximum Mach number under small valve openings, the dynamic opening time, and the hydrodynamic moment acting on the valve disc are chosen to evaluate the difference between the two types of check valves. Results show that the maximum Mach number increases with the decrease in the valve opening and the increase in the mass flow rate, and the Mach number and the pressure difference in the tilting check valve are higher. In the swing check valve, the hydrodynamic moment is higher and the valve opening time is shorter. Furthermore, the valve disc is more stable for the swing check valve, and there is a periodical oscillation of the valve disc in the tilting check valve under a small mass flow rate.
Highlights
With the increasing demand for precise control, various kinds of valves are applied in the pipeline systems
At the top of the swing check valve, the cross-section area is smaller than the bottom of the swing check valve, and water vapor flows along the surface of the valve disc because of the valve structure
In order to gain a better understanding of the swing check valve and the tilting check valve with the same valve body, the computational fluid dynamics method was utilized to investigate their millimeter-scale flow characteristics and dynamic opening characteristics
Summary
With the increasing demand for precise control, various kinds of valves are applied in the pipeline systems. The flow characteristics and the opening process of a check valve have great influences on the performance of the whole pipeline system [1,2]. Yang et al [3,4] focused on the water hammer problem caused by switching of parallel pumps, and they inhabited the phenomenon using a contra-motion check valve. Lee and Leow [8] focused on the pressure surge when a check valve was closed under different flow conditions. Leati et al [13] focused on the dynamic characteristics of a ball check valve and a plate check valve in pipelines with high-frequency oscillation pumps using numerical and experimental methods, and the influence of valve design and fluid propagation effects were investigated. Jin et al [16] and Qian et al [17,18] applied the Tesla valve, which is a new type of check valve, in hydrogen decompression, and the valve noise and the effects of valve stage on valve performance were investigated
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