Experimental Investigation on Contaminated Friction of Hydraulic Spool Valve

Fan, Shuai; Xu, Rui; Hong, Jung-Pyo; Yang, Shaoqiong; Yuan, Qingyun

doi:10.3390/app9235230

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…The taper spool contributes to the increase of the radial forces when the pressure at the larger end of the shoulder is higher than at the smaller end [3]. In addition, the contaminated friction of the clearance fit between the spool and its bore was also studied through the experiments [14]. The contaminated friction was increased on the cis-conical spool, but was decreased on the invert cone spool [14].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the contaminated friction of the clearance fit between the spool and its bore was also studied through the experiments [14]. The contaminated friction was increased on the cis-conical spool, but was decreased on the invert cone spool [14]. The contamination friction can be prevented by using a fine filter and by improving the machining accuracy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lateral Force Acting on the Sliding Spool of Control Valve Due to Radial Flow Force and Static Pressure

Lu¹,

Tiainen

Kiani-Oshtorjani

et al. 2021

IEEE Access

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The hydraulic sliding-spool valve is a key component to control the flow rates and thus pressures in different hydraulic volumes. The lateral force on the spool is one of the important effects resulting from moving resistance. This paper presents research aimed at understanding the effects of radial flow force and static pressure upon the lateral force. The radial flow force is calculated from three types of control surfaces labelled with square land, 45 • conical, and round curved surfaces, for discovering the effects of control profile, combined with inlet and outlet control conditions. The pressure difference effect is analyzed along with six cases under the same orifice opening, and the radial flow force is found to vary linearly with the pressure difference. The results also indicate that the radial force for the inlet control mode is less than that of the outlet control mode. The jet angle is discovered to not only be related to the annular orifice opening and gap clearance, but is also influenced by the flow direction and control surface profile. The static pressure is the predominant factor in the lateral force compared to the radial flow force. The results indicate that the static pressure variation on the surface of the cylindrical spool shoulder increased linearly with the inlet pressure; and two stagnation points can be observed in the case of the valve cavity with oil passages on the same section, and square land control edge profile. The lateral force on the spool increases with the pressure, and could reach to the maximum of 300 N, implying that this force should be taken into account in the selection of an actuator, especially in high pressure applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lateral Force Acting on the Sliding Spool of Control Valve Due to Radial Flow Force and Static Pressure

Lu¹,

Tiainen

Kiani-Oshtorjani

et al. 2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The working principle is to control the flow and flow direction of fluid through the relative movement of the valve core and the valve body, and directly or indirectly controlling the movement of an actuator [5]. As important parts of a hydraulic system, the static and dynamic characteristics of hydraulic valves have an important impact on the stability of a hydraulic system [6,7]. In recent years, flow force has become a research hotspot of scholars the world over.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Triangular Groove Structure on Steady-State Flow Force Compensation Characteristics

Ding

Lin

et al. 2021

Applied Sciences

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In this study, a structurally improved spool was designed. The diameter of one side of the spool stem was reduced, making the spool stem into a rounded table shape. A triangular groove was circumscribed on the step and on the same side. After liquid flow was guided through the triangular groove, the flow direction changed. A flow component in the negative direction was generated, which reversely impacted the liquid flow in the positive direction. The liquid flow angle at the outlet increased; that is, jet angle increased and flow force decreased. The simulation results show that, increasing the depth, H, of the triangular groove has a positive effect on flow-force compensation and was conducive to the stability of the valve core. Properly increasing the groove’s bottom diameter, D1, of the triangular groove was conducive to the stability of the spool, but when D1 was too large, the flow force increased. The experimental results are consistent with the simulation results, which proves that the improved structure can effectively reduce the flow force of the spool.

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“…Jin et al [9] and Qian et al [10][11][12] applied the Tesla valves in the hydrogen decompression process and the flow characteristics and the aerodynamic noise of a single and a multi-stage Tesla valve was investigated. Fan et al [13] focused on the contaminated friction of a spool valve. Qian et al [3] investigated the flow characteristics of a feed-water valve with different structures of the throttling window.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

Li¹,

Gao

Wu³

et al. 2020

Applied Sciences

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Cavitation inside globe valves, which is a common phenomenon if there is a high-pressure drop, is numerically investigated in this study. Firstly, the cavitation phenomenon in globe valves with a different number of cages is compared. When there is no valve cage, cavitation mainly appears at the valve seat, the bottom of the valve core, and the downstream pipelines. By installing a valve cage, cavitation bubbles can be restricted around the valve cage protecting the valve body from being damaged. Secondly, the effects of the outlet pressure, the working temperature, and the installation angle of two valve cages in a two-cage globe valve are studied to find out the best method to suppress cavitation, and cavitation number is utilized to evaluate cavitation intensity. Results show that cavitation intensity inside globe valves can be reduced by increasing the valve outlet pressure, decreasing the working temperature, or increasing the installation angle. Results suggest that increasing the outlet pressure is the most efficient way to suppress cavitation intensity in a globe valve, and the working temperature has a minimal effect on cavitation intensity.

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Experimental Investigation on Contaminated Friction of Hydraulic Spool Valve

Cited by 10 publications

References 16 publications

Lateral Force Acting on the Sliding Spool of Control Valve Due to Radial Flow Force and Static Pressure

Lateral Force Acting on the Sliding Spool of Control Valve Due to Radial Flow Force and Static Pressure

Study on the Influence of Triangular Groove Structure on Steady-State Flow Force Compensation Characteristics

Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

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