Computer Generated Hydraulic Valve Design Saves Time

1994 ◽  
Author(s):  
Craig Chmielewski ◽  
Rick Tortomasi
Keyword(s):  
Valve Design ◽  
Hydraulic Valve

Optimization of a Hydraulic Valve Design Using CFD Analysis

2005 ◽  
Author(s):  
Manohari D. Ramesh ◽  
Yan A. Tan ◽  
XueKui Lan
Keyword(s):  
Cfd Analysis ◽  
Valve Design ◽  
Hydraulic Valve

Measurements of a Novel Digital Hydraulic Valve Comprising a Cushioning Feature

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Niels C. Bender ◽  
Andreas Plöckinger ◽  
Paul Foschum ◽  
Bernd Winkler ◽  
Henrik C. Pedersen
Keyword(s):  
Experimental Results ◽  
Test Rig ◽  
Soft Landing ◽  
Valve Design ◽  
Simulation Data ◽  
Switching Dynamics ◽  
Significant Difference ◽  
Pressure Dynamics ◽  
Induced Flow ◽  
Hydraulic Valve

Abstract This article presents simulation data and measurements of a novel valve concept that features a soft landing concept. The purpose is to validate the design framework that has been applied to design the valve. The experimental results are obtained with a test rig manufactured specifically for this type of valve design. The validation includes studying the valves switching dynamics, cushion pressure dynamics, and movement-induced flow (MIF). The tests show that the tendencies are captured accurately although the exact magnitudes of forces do not match fully and a noticeable difference between simulated and measured plunger position is revealed. This amounts in a significant difference in the cushion pressure. Therefore, the pressure model is validated by using the measured lift and velocity derived hereof and this shows sufficient correspondence between the two pressures.

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.

Piezoelectrically actuated hydraulic valve design for high bandwidth and flow performance

2011 ◽  
Vol 225 (3) ◽  
pp. 345-359 ◽  
Author(s):  
D T Branson ◽  
F C Wang ◽  
D N Johnston ◽  
D G Tilley ◽  
C R Bowen ◽  
...  
Keyword(s):  
Valve Design ◽  
High Bandwidth ◽  
Hydraulic Valve

Passive Control of a Hydraulic Valve

1989 ◽  
Author(s):  
John D. Charlton ◽  
James J. Brickley
Keyword(s):  
Passive Control ◽  
Hydraulic Valve

T-Pouch: A New Valve Design for a Continent Ileostomy

2002 ◽  
Vol 45 (3) ◽  
pp. 411-415 ◽  
Author(s):  
Andreas M. Kaiser ◽  
John P. Stein ◽  
Robert W. Beart
Keyword(s):  
Continent Ileostomy ◽  
Valve Design

Decoupled 1D/3D analysis of a hydraulic valve

2014 ◽  
Author(s):  
Carsten Mehring ◽  
Ashok Zopeya ◽  
Matt Latham ◽  
Thomas Ihde ◽  
Dan Massie
Keyword(s):  
3D Analysis ◽  
Hydraulic Valve

Dynamic analysis of leaflet stresses and application to heart valve design

1988 ◽  
Vol 10 (5) ◽  
pp. 453-457 ◽  
Author(s):  
P.A.A. Laura ◽  
R.E. Rossi ◽  
D.V. Bambill de Rossit
Keyword(s):  
Dynamic Analysis ◽  
Heart Valve ◽  
Valve Design

Design Method for Fast Switching Seat Valves for Digital Displacement® Machines

2014 ◽  
Author(s):  
Daniel B. Roemer ◽  
Per Johansen ◽  
Henrik C. Pedersen ◽  
Torben O. Andersen
Keyword(s):  
Pressure Loss ◽  
Design Method ◽  
Thermal Dissipation ◽  
Valve Design ◽  
Stroke Length ◽  
Efficient Operation ◽  
Fast Switching ◽  
Switching Times ◽  
High Bandwidth ◽  
Electro Magnetic

Digital Displacement® (DD) machines are upcoming technology where the displacement of each pressure chamber is controlled electronically by use of two fast switching seat valves. The effective displacement and operation type (pumping/motoring) may be controlled by manipulating the seat valves corresponding to the piston movement, which has been shown to facilitate superior part load efficiency combined with high bandwidth compared to traditional displacement machines. However, DD machines need fast switching on-off valves with low pressure loss for efficient operation, especially in fast rotating operation, where switching times must be performed within a few milliseconds. These valve requirements make a simulation based design approach essential, where mechanical strength, thermal dissipation, fluid dynamics and electro-magnetic dynamics must be taken into account. In this paper a complete design method for DD seat valves are presented, taking into account the significant aspects related to obtaining efficient DD valves with basis in a given DD machine specifications. The seat area is minimized and the stroke length is minimized to obtain fast switching times while considering the pressure loss of the valves. A coupled optimization is finally conducted to optimize the electro-magnetic actuator, leading to a valve design based on the chosen valve topology. The design method is applied to an example DD machine and the resulting valve design fulfilling the requirements is presented.

Soft Switching Approach to Reducing Transition Losses in an On/Off Hydraulic Valve

2009 ◽  
Author(s):  
Michael B. Rannow ◽  
Perry Y. Li
Keyword(s):  
Hydraulic System ◽  
Check Valve ◽  
Fluid Flows ◽  
Soft Switching ◽  
Total System ◽  
System Efficiency ◽  
Hydraulic Systems ◽  
Controlled Systems ◽  
Flow Through ◽  
Hydraulic Valve

A method for significantly reducing the losses associated with an on/off controlled hydraulic system is proposed. There has been a growing interest in the use of on/off valves to control hydraulic systems as a means of improving system efficiency. While on/off valves are efficient when they are fully open or fully closed, a significant amount of energy can be lost in throttling as the valve transitions between the two states. A soft switching approach is proposed as a method of eliminating the majority of these transition losses. The operating principle of soft switching is that fluid can temporarily flow through a check valve or into a small chamber while valve orifices are partially closed. The fluid can then flow out of the chamber once the valve has fully transitioned. Thus, fluid flows through the valve only when it is in its most efficient fully open state. A model of the system is derived and simulated, with results indicating that the soft switching approach can reduce transition and compressibility losses by 79%, and total system losses by 66%. Design equations are also derived. The soft switching approach has the potential to improve the efficiency of on/off controlled systems and is particularly important as switching frequencies are increased. The soft switching approach will also facilitate the use of slower on/off valves for effective on/off control; in simulation, a valve with soft switching matched the efficiency an on/off valve that was 5 times faster.

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