Multifunctional four-port directional control valve constructed from logic valves

Lisowski, E.; Czyżycki, Wojciech; Rajda, Janusz

doi:10.1016/j.enconman.2014.07.008

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…Due to the flow speed of drilling fluid flowing through the valve orifices is very high, the fluid flow at the rotary valve should normally be turbulent. Among similar simulation problems, k −ε model is widely used for some valves and has achieved good results, such as safety relief valve [26], globe valve [27] and logic valve [28], and also the rotary valve [19]. Therefore, the section will also choose k − ε model to solve load torque acting on rotary valve with irregular valve port.…”

Section: B Turbulence Modelmentioning

confidence: 99%

Modeling and Analysis of the Load Torque Acting on the Drilling Fluid Continuous Wave Generator

Zhou

Han

et al. 2020

IEEE Access

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Drilling fluid continuous wave(DFCW) generator is an advanced downhole instrument and has broad application prospects. The load torque acting on the DFCW generator has a great impact on the performance on the DFCW generator, and there is a lack of theory describing the load torque because of the irregularity of the rotary valve. In this paper, the drilling fluid flow area is divided into the curve flow area, the radial flow area and the axial flow area. The flow area of each part is divided into several meshes based on finite element theory, then the load torque acting on each part is calculated based on the fluid momentum conservation theory. The theoretical model is verified by combining the simulation and the experiment, and the effects of the discharge and the axial gap on the load torque are analyzed. The research results show that:(1) the theoretical model can be used to determine the load torque, (2) the amplitude of the load torque reduces as the gap decreases and increases rapidly as the discharge increases. The results can provide the theoretical guidance for the structure design of the rotary valve and the control system design of the drilling fluid continuous wave generator.

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Section: B Turbulence Modelmentioning

confidence: 99%

Modeling and Analysis of the Load Torque Acting on the Drilling Fluid Continuous Wave Generator

Zhou

Han

et al. 2020

IEEE Access

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“…24 In addition, standard k – ɛ turbulence model has been successfully used in the three-dimensional CFD simulation of various valves with hydraulic fluid. 25–28 Thus, the standard k – ɛ turbulence model is selected for the simulation of the single-stage rotary servo valve. The turbulence kinetic energy k and its rate of dissipation ɛ can be computed by and …”

Section: Cfd Modelmentioning

confidence: 99%

Reduction of steady flow torques in a single-stage rotary servo valve

Quan

Huang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this paper, geometry optimization of spool is proposed to reduce the steady flow torques in a single-stage rotary servo valve. The steady flow torques under different spool structures are studied by computational fluid dynamics simulation and experimental test and the most effective spool structure is found out. Then, the effects of geometry parameters on the steady flow torques are studied and an optimized solution for reduction of the steady flow torques is suggested by considering the optimization qualities and production costs. The results show that modification of the geometry of spool can make the jet angle at the orifices much closer to 90°, with almost no effect on the flow rate. Processing annular groove in the spool land with increased number of grooves on one side of the spool land is an effective way to reduce the steady flow torques. The maximum value of steady flow torques reduces with a gradual decrease in reduction as the external diameter of annular groove and the number of grooves increase. With the optimized spool structure, the maximum value of steady flow torques can be reduced significantly.

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“…Otherwise, the experimental operation without filtering could very soon lead to the malfunction of the valve. Therefore, the structure types of the conventional oil spool or rotary valves are unable to completely meet the demands due to the leakage and contamination wear [18][19][20][21][22]. Consequently, it is necessary to develop a seawater hydraulic 4/3 directional valve with low internal leakage and strong antipollution ability.…”

Section: Introductionmentioning

confidence: 99%

Research on the dynamic characteristics of seawater hydraulic cartridge-type 4/3 directional valve

Nie

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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Water hydraulic directional valve is a key control element in seawater fluid power system. Because of the properties of high bulk modulus and low viscosity of seawater, the leakage and dynamic characteristics of directional valve would be different from those of the traditional one. In this study, a new working principle of seawater hydraulic 4-3 cartridge directional valve (abbr. SHCDV) is introduced, and the mathematical model and simulation model of the SHCDV are developed in this paper. The pressure and flow characteristics are investigated through simulation and experiment. The optimal structure parameters and dynamic characteristic curves of SHCDV are achieved through simulation. The simulation results show that the control chamber area, the damping hole diameter of the cartridge valve, and the flow rate of the pilot valve have important influences on the dynamic characteristics of SHCDV. Meanwhile, the static and dynamic characteristics of SHCDV are measured using a water hydraulic-component-performance test stand. The results show that its rated pressure is 14 MPa, the flow rate is 120 L/min, the dynamic opening response time is 109 ms, and the closing time is 128 ms. The experimental results are basically consistent with the simulation results, and verify the accuracy of the simulation model. This research will lay the foundation for the further development of a high-pressure, high-flow, and fastresponse SHCDV, and it can be widely used in oceanic exploration, marine development, desalination, and other fields.

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Multifunctional four-port directional control valve constructed from logic valves

Cited by 14 publications

References 12 publications

Modeling and Analysis of the Load Torque Acting on the Drilling Fluid Continuous Wave Generator

Modeling and Analysis of the Load Torque Acting on the Drilling Fluid Continuous Wave Generator

Reduction of steady flow torques in a single-stage rotary servo valve

Research on the dynamic characteristics of seawater hydraulic cartridge-type 4/3 directional valve

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