A Miniature On/Off Valve Concept for High Performance Water Hydraulics

2017 ◽  
Author(s):  
Miika Paloniitty ◽  
Matti Linjama
Keyword(s):  
High Performance ◽  
Control Valve ◽  
Hydraulic Control ◽  
Used Oil ◽  
Water Hydraulics ◽  
Starting Point ◽  
Pressure Medium ◽  
Water Hydraulic ◽  
Valve Control ◽  
Hydraulic Valve

Digital hydraulic control valve technology has shown its strengths in providing reliable, leak-tight and high performance valve control regardless of the pressure medium used, oil or water. This is enabled by the intelligent use of robust on/off seat valves. However, the availability of these valves for water hydraulics is limited, especially that of compact valves, which are needed for digital valve systems. Thus, with the aim to create a compact digital water hydraulic valve system, this paper presents the development process of a water hydraulic miniature valve. The starting point for the development is a previously developed miniature valve for oil hydraulics. Experimental results with the new prototype show that good performance can be achieved for the miniature valve even with using stainless steel materials. This enables high-performance digital water hydraulic control.

Design and Simulation on Multi-Digit Numerical Control Valve in Water Hydraulics

2011 ◽  
Vol 422 ◽  
pp. 257-261
Author(s):  
Zeng Meng Zhang ◽  
Yong Jun Gong
Keyword(s):  
Control Valve ◽  
Poor Performance ◽  
Numerical Control ◽  
Hydraulic Control ◽  
Control Performance ◽  
Poppet Valve ◽  
Water Hydraulics ◽  
Water Hydraulic ◽  
The Stability ◽  
And Control

Due to the problems about Lubrication and sealing in water hydraulics, the poor performance, large leakage, extreme requirements of processing, high cost and poor anti-pollution properties exist in water hydraulic servo or proportional valves of spool structure and analogue control. A better seal is provided by the structure of the poppet valve comparing to the spool valve, however, poorer linearity and control accuracy accompanying inevitably. Aiming at improving the control performance of poppet valve, the design of the multi-digit numerical control valve is analyzed in this paper. The novel design using ball seat valves for digital bits is proposed to ensure enough seal ability and lower the cost. The simulation model of the multi-digit numerical control valve is built in AMESim software and the results show high linearity in flow control. However, large overshoot and oscillation encounter during the switching of the digits. Especially the switching process of the high digital bits requires to be regulated to reduce the large overshooting. The adjustment of the spring in the sensitive chamber of the bit valve can decrease the overshoot and improve the stability. These above contribute to the improvement of the control performance of water hydraulic control valves and applications of water hydraulics in the industry.

Analysis and Simulation on Drive Characteristic of High-Strength Water Hydraulic Artificial Muscle

2014 ◽  
Vol 889-890 ◽  
pp. 488-492
Author(s):  
Zeng Meng Zhang ◽  
Jiao Yi Hou ◽  
Zheng Wen Sun ◽  
Yong Jun Gong ◽  
Jian Miao
Keyword(s):  
Flow Rate ◽  
Control Valve ◽  
Artificial Muscle ◽  
High Strength ◽  
Hydraulic Control ◽  
Hydraulic Circuit ◽  
Water Hydraulic ◽  
The Difference ◽  
Hydraulic Valves ◽  
Load Mass

Driving processes and characteristics are different between the water hydraulic artificial muscle and pneumatic artificial muscle due to the difference of work media employed in muscles. An appropriative hydraulic circuit was designed to control the pressure of the water hydraulic artificial muscle and the performance of this system was analyzed. An AMESim model of the control system was built and the dynamic characteristics are analyzed with various parameters of the hydraulic circuit and various loads by simulation. The results show that the performance of the water hydraulic control valve should agree with the dimension of the water hydraulic artificial muscle. The rated flow rate of the water hydraulic valves can be selected increasingly while the load mass is low. Meanwhile, the overshoot is generated and enlarged along with the increases of the flow rate and load mass. These contribute to the improvements of designs and researches on control systems of water hydraulic artificial muscles.

Microbial water quality and diversity in hydraulic systems using tap water as a pressure medium

2000 ◽  
Vol 41 (12) ◽  
pp. 215-222 ◽  
Author(s):  
S. M. Soini ◽  
K. T. Koskinen ◽  
M. Vilenius ◽  
J. A. Puhakka
Keyword(s):  
Hydraulic System ◽  
Tap Water ◽  
Pilot Scale ◽  
Hydraulic Systems ◽  
Water Hydraulics ◽  
Pressure Medium ◽  
Viable Bacteria ◽  
Water Hydraulic ◽  
Cell Densities

Water hydraulics uses tap water or demineralised water as a pressure medium and has fewer environmental impacts than oil-using hydraulics. The applicability is restricted by the microbial quality of the medium. The objectives of this study were to determine whether microbes grow in the pressure medium of a water hydraulic system, biofilm is formed on the surfaces and to describe the diversity of bacteria that survive and grow in water hydraulic systems. A pilot-scale water hydraulic system was used in the experiments. The viable counts in the pressure medium increased in three days from 102 to 3 ×104 cfu/ml followed by a gradual decrease towards the steady-state concentration of 6× 1034 cfu/ml. The total cell numbers decreased from 3×105 to 2 ×104 cells/ml during the three weeks of operation indicating attachment onto the system surfaces as biofilms. The biofilm cell densities on collector slide surfaces varied between 7 ×103 and 1.2 ×104 cells/cm2 after 21 days of operation. The phosphatase activity in the pressure medium was in conformity with the numbers of viable bacteria. The enzymatic activities (α- and β- glucosidase, phosphatase, aminopeptidase) varied between 0.4 and 300 nmol/lh. The diversity of bacteria growing in the system was wide and differed from that of tap water.

Development of Water Hydraulic System

2016 ◽  
Vol 819 ◽  
pp. 596-600
Author(s):  
Mohd Noor Asril Saadun ◽  
Ahmad Anas Yusof ◽  
Mohd Syukran Ismail
Keyword(s):  
System Performance ◽  
Hydraulic System ◽  
Operation Time ◽  
Control Valve ◽  
Pressure Control ◽  
Effect Of Temperature ◽  
Maximum Pressure ◽  
Water Pump ◽  
Pressure Medium ◽  
Water Hydraulic

Common hydraulic system using hydraulic oil as their working medium but there is an application using water due to high accessibility and environmentally concern.Water hydraulic is an attractive technology to use water as the pressure medium in hydraulic system. In this paper, water hydraulic system is design and develops that capable to use water as pressure medium. Water is used to provide clean environment and safe for the mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. Some of water challenged as the pressure medium in hydraulic system were considered during build and design the system to minimize the bad effect of water in hydraulic system. Besides, the arrangement of hydraulic components on the test rig also considered to optimize the water hydraulic system performance. Water hydraulic system performance was analyzed by measured maximum pressure produced from water pump and system efficiency. Others, the effect of temperature increment in water hydraulic system also analyzed to optimize operation time.

scholarly journals Hydraulic Valve for Miniature Surgical Robot Applications

2017 ◽  
Author(s):  
Devin R. Berg ◽  
Perry Y. Li
Keyword(s):  
Experimental Testing ◽  
Control Valve ◽  
Hydraulic Control ◽  
Valve Design ◽  
Minimally Invasive Surgical ◽  
Advanced Robotics ◽  
Design Options ◽  
Design And Testing ◽  
Hydraulic Valve ◽  
Selection Of

This paper describes the design and testing of a novel hydraulic control valve for use in the minimally invasive surgical robotic manipulator. The use of hydraulics for surgical robotics opens new possibilities for miniaturization and robustness. However, to enable this, there exists a need for hydraulic components which bridge the size gap between traditional fluidics and microfluidics. This paper provides motivation for the development of a miniature hydraulic valve designed specifically to enable a serpentine style hydraulic surgical manipulator. Included are a description of the various considerations relevant to the valve and its specific application, such as the method of manipulation for the valve, as well as a theoretical valve design and a mathematical description of the operating principles. Two possible methods of valve activation, piezoelectric and electromagnetic, are discussed along with two physical realizations of the valve design are presented which demonstrate the theoretical design. Finally, the results of experimental testing performed on valve prototypes is described to evaluate the design options and help inform the selection of the final configuration.This is a preprint of an article submitted for consideration in ADVANCED ROBOTICS, copyright Taylor & Francis and Robotics Society of Japan; ADVANCED ROBOTICS is available online at http://www.tandfonline.com/tadr.

Research on the Stability of a System Consisting of a Water Hydraulic Control Valve and Cylinder

2016 ◽  
Author(s):  
Futoshi Yoshida ◽  
Shimpei Miyakawa ◽  
Shouichiro Iio
Keyword(s):  
Natural Frequencies ◽  
Tap Water ◽  
Control Valve ◽  
Working Fluid ◽  
Entire System ◽  
Hydraulic Control ◽  
Compensation Circuit ◽  
Design Guideline ◽  
Water Hydraulic ◽  
The Stability

Water hydraulic system using tap water as working fluid is a new driving method which provides high speed, high-output control, while providing safety, hygiene, and ecofriendliness. Its applicable markets widely range from food, health, pharmaceuticals, cosmetics, semiconductors, beverages, to energy industries. Applications of the water hydraulic technology differ from those of its oil counterpart in heavy industries. This paper is aimed at analytically considering the stability of systems that use tap water as the working fluid. We studied a comprehensive system, including a water hydraulic control valve, a cylinder, and piping for connecting these components, to determine the transfer function of the entire system that has three elements: a control valve; piping and cylinder; and a compensation circuit. Based on the determined function, we reviewed the relationship among natural frequencies of the system, including the control valve and piping, and examined the effect of the control valve and cylinder on the stability of the entire system according to the Hurwitz stability criterion. This gave us a design guideline about the compensation circuit that stabilizes the system by adjusting the natural frequency of the water hydraulic proportional control valve according to the natural frequencies of the piping and cylinder.

Performance Analysis of Directional Control Valve: An Overview

2014 ◽  
Vol 592-594 ◽  
pp. 1983-1987
Author(s):  
Ramashankar Paswan ◽  
Jayanta Das ◽  
N. Kumar ◽  
Ajit Kumar ◽  
Santosh Kumar Mishra ◽  
...  
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Compressed Air ◽  
Hydraulic Control ◽  
Control Valves ◽  
Directional Control ◽  
Full State ◽  
Full State Feedback ◽  
High Bandwidth ◽  
Valve Control

Directional control valves start, stop or change the direction of flow in compressed air applications. To understand the different applications of compressed air and how valves are used, one must first have knowledge of the kinds and types of valves used by industries. This paper studies local valve control of the electro-hydraulic system. The slow response of hydraulic control valve usually becomes the hold-up of whole system performance. Although fast valves (e.g. high-bandwidth servo-valves) are available, they are far more expensive than slow valves (e.g. proportional directional control valves). To improve the performance of proportional directional control valves, three different types of controllers are synthesized. Firstly, based on the pole zero cancellation technique, an open loop compensator is designed which requires the accurate valve dynamic model information; Secondly, a full state feedback adaptive robust controller (ARC) is synthesized, which effectively takes into account the effect of parametric uncertainties and uncertain nonlinearities such as friction force and flow force. Finally, an output feedback ARC controller is synthesized to address the problem of un measurable states. Keywords: valve, hydraulic device, Simulink.

scholarly journals Parameterized Uncertainty Model Using a Genetic Algorithm With Application to an Electro-Hydraulic Valve Control System

2015 ◽  
Author(s):  
Zuheng Kang ◽  
Bahaa I. Kazem ◽  
Roger C. Fales
Keyword(s):  
Genetic Algorithm ◽  
Control System ◽  
Flow Control ◽  
Robust Stability ◽  
Control Valve ◽  
Flow Control Valve ◽  
Uncertainty Model ◽  
Electrohydraulic Valve ◽  
Valve Control ◽  
Hydraulic Valve

This work proposes a new method of determining a parameterization of an uncertainty model using a genetic algorithm. A genetic algorithm is used in a unique way to solve the non-convex parameterization problem in this work. The methods presented here are demonstrated on an electrohydraulic valve control system problem. This demonstration includes parameterizing an uncertainty class determined from test data for 30 replications of an electrohydraulic flow control valve. The parameterization of the uncertainty is used to analyze the robust stability of a control system for a class of valves.

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

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