Effect of Cavitation in Water Hydraulic Poppet Valves

Investigation of Cavitation Near the Orifice of Hydraulic Valves

“…Figure 11 shows the experimentally measured surface pressure coefficient, C p , distribution of a sharp-edged seat poppet valve with a half cut test model by Oshima et al [3]. It is concluded that the sharp-edged seat valve is less influenced by the cavitation on its characteristics [3]. Because of the different geometrical shape, size, and working conditions, the quantitative comparison with the present results is difficult.…”

Analysis of cavitation flow in conical throttle valve with different cone angle

“…6, the liquid flow begins to shrink at the orifice, and the pressure drops below the saturated vapour pressure, then cavitation bubble will appear. When cavitation appears inside the orifice, so‐called choking phenomenon appears [3], whose pressure becomes lower than the atmospheric pressure. Furthermore, there also a pressure fluctuate at 19 mm, near the tip of the valve cone, because the two high‐speed liquid collision from both sides of the channel.…”

“…Those vapour bubbles collapse in the high‐pressure region [1, 2]. Generally, cavitation causes undesirable problems in the fluid systems, such as efficiency reduction, increase of vibrations and noise, unexpected change in the characteristics of flow rate and flow force and in the most violent case the erosion of components [3, 4]. As the orifice is the key parameter of the throttle valve, its structure and characteristic is related to the working performance and efficiency of the conical throttle valve.…”

Vibration characteristics of the two‐stage throttle valve induced by cavitation

“…Until now, many studies have been performed on cavitation vibration in hydraulic valves. The occurrence of cavitation and its effect on the flow performance were studied experimentally through a hydraulic poppet valve with a half‐cut test model by Oshima and Ichikawa [4]. In the research work of Tsukiji [5], the cavitation flow pattern near the poppet's orifice and the vibration of the poppet were investigated by numerical and experimental methods.…”