Development of Water Hydraulic Proportional Control Valve

Takahashi, Tamami; Yamashina, Chishiro; Miyakawa, Shimpei

doi:10.5739/isfp.1999.549

Cited by 20 publications

(6 citation statements)

References 2 publications

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“…High performance water hydraulic flow control valves such as servo valves and proportional valves for water hydraulic use have already been developed, although maintenance and price-related problems in their practical use still remain [3,4]. Accordingly, the flow or pressure control using high-speed solenoid valve controlled by PWM control method could be a good solution for these problems.…”

Section: Introductionmentioning

confidence: 98%

Design and performance characteristic analysis of servo valve-type water hydraulic poppet valve

Park

2009

J Mech Sci Technol

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For water hydraulic system control, the flow or pressure control using high-speed solenoid valve controlled by PWM control method could be a good solution for prevention of internal leakage. However, since the PWM control of on-off valves cause extensive flow and pressure fluctuation, it is difficult to control the water hydraulic actuators precisely. In this study, the servo valve-type water hydraulic valve using proportional poppet as the main valve is designed and the performance characteristics of the servo valve-type water hydraulic valve are analyzed. Furthermore, it is demonstrated through experiments that a decline in control chamber pressure that follows the change of pilot flow is caused by the occurrence of cavitation around the proportional poppet, and that fundamental characteristics of the developed valve remain unaffected by the occurrence of cavitation.

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Section: Introductionmentioning

confidence: 98%

Design and performance characteristic analysis of servo valve-type water hydraulic poppet valve

Park

2009

J Mech Sci Technol

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“…Present water hydraulic control valves with a threeposition four-way slide structure are not suitable for hydraulic roof support due to their low nominal flow and the gap sealing of valve ports. [5][6][7] The other type of water-based proportional valve is the two-position two-way seat valve, which is suitable for water medium, but it cannot change the direction of the cylinder. 8 In a word, the existing water hydraulic proportional valve cannot meet the flow rate, supply pressure, or function of the hydraulic roof support.…”

Section: Introductionmentioning

confidence: 99%

Research on the performance of a novel electro-hydraulic proportional directional valve with position-feedback groove

Zhao

Liao

Zi-sheng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Accurate posture control of hydraulic roof supports, which use pressurized water as their fluid power source, is an important part and research direction of intelligent fully mechanized mining face. At present, the large flow on/off directional valve used on the hydraulic roof support cannot meet the requirement of precise posture control of the roof support. To overcome the conundrum, a novel two-position three-way electro-hydraulic proportional directional flow valve for hydraulic roof support is proposed. The new valve contains two pilot stages and two main spools. The two pilot stages cooperate with each other to control the movement of the two main valve spools, which are the inlet valve spool and the outlet valve spool. The inlet valve spool adopts the Valvistor principle. The valve can realize manual pilot control and electro-hydraulic proportional flow control of the passage P-A, which has been verified by a simulation model. In this paper, the static and dynamic mathematical models of the new proportional valve are established, and the key parameters affecting the valve performances are analyzed and verified by the simulation model. An optimization control scheme is proposed to overcome the influence of supply pressure, P-A pressure difference, and nonlinear interference force on steady-state displacement and response speed of the valve. The results show that this optimization method can significantly improve the response speed of the spool and promote the linearity of spool displacement under a slope signal. In addition, the fluctuation of chamber pressure and spool displacement caused by the discontinuous flow of a fast switching valve is systematically analyzed. The analysis shows that increasing pulse-width modulation carrier frequency is an effective way to reduce fluctuation amplitude. The research provides a new design idea and control method for an electro-hydraulic proportional directional valve of hydraulic roof support.

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“…High-performance water hydraulic flow control valves such as servo valves and proportional valves, which are very important components in water hydraulic systems, have already been developed, although maintenance and price-related problems in their practical use still remain [3,4]. In addition, because all these valves adopt the slide-type spool valve, water always leaks around the null point due to the low viscosity of water.…”

Section: Introductionmentioning

confidence: 99%

Development of a proportional poppet-type water hydraulic valve

Park

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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To address the environmental problems and the safety of hydraulic systems, the development of novel water hydraulic systems using working fluids such as tap water are being developed successfully. In this study, we aim to develop a proportional water hydraulic valve using a proportional poppet as the main valve, which has an on-off function as well as a proportional function. The proposed proportional poppet-type water hydraulic valve has a simple structure with a control orifice that passes to the pilot orifice at both sides of the conventional poppet. Experiments verified that the relation between the main flowrate and pilot flowrate of the developed valve is linear and that the dynamic characteristics of the proportional poppet are satisfactory. Also, the developed valve was verified to be suitable for pulse width modulation (PWM) control and practical use for the control of water hydraulic systems.

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Development of Water Hydraulic Proportional Control Valve

Abstract: Our development program fabricated a proportional control valve that exclusively uses water as its working fluid. The valve is equipped with a spool, and the spool is directly driven by a proportional solenoid that is modified for water use.

Cited by 20 publications

References 2 publications

Design and performance characteristic analysis of servo valve-type water hydraulic poppet valve

Design and performance characteristic analysis of servo valve-type water hydraulic poppet valve

Research on the performance of a novel electro-hydraulic proportional directional valve with position-feedback groove

Development of a proportional poppet-type water hydraulic valve

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