Design of pilot-assisted load control valve for proportional flow control and fast opening performance based on dynamics modeling

Xie, Haibo; Liu, Jianbin; Hu, Liang; Yang, Huayong; Fu, Xin

doi:10.1016/j.sna.2015.09.042

Cited by 13 publications

(11 citation statements)

References 7 publications

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“…The method involves the use of a flow control valve and a pressure relief valve for stroke speed adjustment of a lifting device with a hydraulic cylinder. Another design example of a pilot-assisted load control valve for proportional flow control based on dynamics modelling was presented by Xie et al [7]. The flow through the designed valve is proportionally controlled by pilot pressure.…”

Section: • Using the Energy Of A Return Fluid Stream To Re-supply A Hmentioning

confidence: 99%

“…13. Test bench schematic: (1) pump, (2), (10) relief valve, (3) differential valve, (4), (9) throttle valve, (5) hydraulic actuator, (6), (8), (11) check valve, (7) control valve, (12) LVDT transducer, (13) pressure transducers, (14) flow meter, (15) DAQ card and PC…”

Section: Test Bench Experimentsmentioning

confidence: 99%

“…The UZFD6 prototype valve consists of a differential valve (3), two check valves (6), (8) and two adjustable throttle valves (4), (9). The UZFD6 valve is rigidly connected to the control valve (7), which provides flow continuity through the P supply port, the T return port, and the A 1 -A 2 , B 1 -B 2 operating ports. Depending on the u ster control valve settings, the right or left side of a hydraulic cylinder (5) is supplied.…”

Section: Test Bench Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

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This article discusses the possibility of increasing the speed of movement of a single-sided hydraulic cylinder piston rod using a fluid stream from the return line. Directing the return stream back to the supply line instead of the fluid reservoir causes significant increase in the inflow rate to the actuator. This situation may arise when the piston rod of the cylinder is not fully loaded on part of the movement range. As part of this work, we proposed a solution in the form of a novel control valve, consisting of a throttle valve and a differential valve controlled by the pressure difference between the supply line and the return line. A geometric model was created using SolidWorks, then a simulation model was made in Matlab/Simulink. Next, simulations were carried out to prove that the use of the return fluid stream gives a possibility of a significant increase in the piston rod speed. The results of the numerical analyses were verified on a test bench where the valve prototype was tested. Speed characteristics of the piston rod against both payload force and throttle valve setting were determined. High convergence with the simulation results was obtained. It has also been confirmed that the proposed solution can be advantageous in practical applications.

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Section: • Using the Energy Of A Return Fluid Stream To Re-supply A Hmentioning

confidence: 99%

Section: Test Bench Experimentsmentioning

confidence: 99%

Section: Test Bench Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

View full text Add to dashboard Cite

show abstract

“…The presented LCV, 23 whose sectional structure is shown in Figure 1, mainly consists of a pilot poppet, a pilot piston, a main poppet, a control spring, a feedback spring, etc. There are four ports on the valve, which are the load port B, back flow port A, pilot port X, and drain port L. The load port B is commonly mounted on a hydraulic actuator directly and the pressure of this port is usually high because of the gravity of the load.…”

Section: Working Principle Of the Lcvmentioning

confidence: 99%

“…However, the flow force worked on the main poppet acts as a disturbance in the control process of the main poppet, which has been analyzed and proved by former research. 23 Because of the bad accuracy of classical equation when calculating the flow forces in poppet valves with converging flow, the flow force effect is an unpredictable disturbance when controlling the main poppet position. The smaller the flow forces are, the better accuracy the main poppet can be controlled.…”

Section: Working Principle Of the Lcvmentioning

confidence: 99%

Flow force regulation of the main poppet in a large flow load control valve

Liu

Xie

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents the regulation methods of flow forces acting on the main poppet in a large flow load control valve. The negative flow forces working on the originally designed main poppet, which is as high as 10% of the control force, act as a big disturbance to the main poppet position control, resulting in poor lowering speed control performance of the load control valve or even instability of the main poppet. Firstly, by introducing a damping tail structure to the main poppet, the direction of the flow forces can be regulated to positive and best stability of the main poppet can be achieved with the calculated best parameter combination. Secondly, by introducing a damping tail with holes to the main poppet, the positive flow forces of all main poppet positions can be reduced to minimum, which results in minimum disturbance for the control of main poppet. Computational fluid dynamics calculations were conducted to analyze how the damping tail parameters affect the flow forces and obtain the best parameter combinations. A test rig was set up to validate the effect of above methods. Good agreement of the computational fluid dynamics calculations and experiment results indicates that the proposed methods can provide guidance for the flow force regulation of other valve poppets.

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Realization of direct flow control with load pressure compensation on a load control valve applied in overrunning load hydraulic systems

Liu

Xie

et al. 2017

Flow Measurement and Instrumentation

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Design of pilot-assisted load control valve for proportional flow control and fast opening performance based on dynamics modeling

Cited by 13 publications

References 7 publications

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Flow force regulation of the main poppet in a large flow load control valve

Realization of direct flow control with load pressure compensation on a load control valve applied in overrunning load hydraulic systems

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