Bulletin “FLUID POWER” Vol.30,No.2(2016.5)
Special issue on the 60th Anniversary of JFPA foundation
Part1 General Introduction, Part2 Future Prospect, Part3 Product Trends [PDF]
Water: the new power for machines！2014 [PDF]
New Water Hydraulics – Promoting the advanced ADS technology
Social sustainability, safety, cleanness, and hygiene are some of vital elements for today’s technology development. Fluid power industry is not an exception when it comes to producing drive products, which conventionally incorporate a single or combination of oil hydraulic, pneumatic, and electronic powers. To offer a fluid power drive that is socially sustainable, the industry has started upgrading a long-surviving technology, water hydraulics, to adapt it into our modern life style.
To respond the trend, Japan Fluid Power Association (JFPA) implemented “Technical Study on Environmental Friendly Water Hydraulic Drive Systems” from 1998 to 2000 and subsequently “Research and Study for the Practical Use of the Aqua Drive Technology” from 2001 to 2003. These projects, supported with the Machinery Promotion Fund from Japan Motorcycle Racing Organization, have promoted “aqua drive system (ADS) technology,” which strictly uses “tap water” as the working fluid. Since then, the ADS technology has been drawing attention in the United States and Europe as a suitable solution to coop with environmental safety and hygienic issues.
JFPA has complied the study outcome in a booklet “Aqua Drive System / Technical Guide” in 2000. It further released the 2nd report in 2003 ( click here ) as a sum of the 2nd project, which consists of detailed information of ADS, its practical application examples and products developed by companies joined for the project. In terms of feasibility, current ADS markets, their scales and potentials were also explored.
The Universal Aqua Drive System (UniADS) program, which runs from April 2005 to March 2007, has started to help expand new fluid power markets where ADS advantages will fulfill various safety demands from the society of the next generation. This program further explores feasibility of the tap water hydraulic power to a wide range of machinery for transforming them into environmentally friendly equipment. The proposed system converts pressure of tap water pipe network of social infrastructure into drive power of various levels. With the UniADS system, machinery driven by multiple power sources can be run by the single power source: water pipe pressure. UniADS requires no other power unit because it utilizes pressure in the existing water pipe network, and this convenience will push popularize ADS. (See the application range of UniADS.) From the perspectives, the project focuses feasibility of the UniADS, in terms of a total system including low-pressure actuator engineering.
Committee of the UniADS feasibility study
|Chairman||Dr. Atsushi Yamaguchi||Yokohama National University|
|Vice-chairman||Dr. Ato Kitagawa||Tokyo Institute of Technology|
|Vice-chairman||Dr. Shigeru Ikeo||Sophia University|
|Organizer||Dr. Shimpei Miyakawa||Takako Industry Co., Ltd.|
|Member||Dr. Shigeru Oshima||Numazu National College of Technology|
|Mr. Takafumi Inoue||Kitamura Shoko Co., Ltd.|
|Mr. Akira Ohashi||Yuken Kogyo Co., Ltd.|
|Dr. Kazuhisa Ito||Sophia University|
|Mr. Yukihiro Shoji||Nachi-Fujikoshi Corp|
|Mr. Yoshihiro Ohbayashi||Takako Industries Inc.|
|Dr. Seiichi Nagata||Kayaba Industry Co., Ltd.|
|Mr. Wataru Takezaki||Toyooki Kogyo Co., Ltd.|
|Mr. Hiroshi Morohashi||TOKYO KEIKI INC|
|Mr. Katsuaki Ogiwara||Taiyo, Ltd.|
|Mr. Tsutomu Iguchi||Hirose Valve Industry Co., Ltd.|
|Mr. Yasuo Konishi||Kawasaki Precision Machinery Ltd.|
|Mr. Katsumi Matsui||NOK Corp.|
|Mr. Junichi Mizuno||CKD Corp.|
|Mr. Yuuki Kinoshita||TACO Co., Ltd.|
|Mr. Yoshitada Doi||SMC Corp .|
|Mr. Tadamasa Murakami||Konan Electric Co., Ltd .|
|Mr. Akio Nakano||FLO-TEC, Ltd.|
|Mr. Sadao Orita||Maruyama Excell Co., Ltd.|
|Mr. Osamu Koito||Ministry of Economy, Trade and Industry|
|Secretary||Mr. Yoshinari Miura||Japan Fluid Power Association|
Aqua Drive System – Technical Guide 2
(This Guide is available from JAPA; contact JFPA Office for this Guide.)
- Table of Contents -
|Chapter 1||Approaches Toward Application of ADS||1|
|Chapter 2||Guide for Selecting ADS Components||3|
|2.1 List of components and suppliers||3|
|2.2 Types and specifications||6|
|2.2.1 Overview of water hydraulic components||6|
|2.2.2 Specifications of water hydraulic components||10|
|2.3 Materials for components and systems||17|
|Chapter 3||Water Quality Control for Aqua Drive System||18|
|3.1 Water quality||18|
|3.2 Water quality evaluation test||18|
|3.2.1 Test apparatus and conditions||18|
|3.2.2 Test result||19|
|3.3 Guidelines for water quality control||21|
|Chapter 4||Operating Aqua Drive System||23|
|4.1 High-speed operation||23|
|4.1.1 Experimental apparatus and method||23|
|4.1.2 Experimental results||25|
|4.2 ADS operational guideline||32|
|4.2.1 Pressure loss and flow rate||32|
|4.2.2 Surge pressure prevention||33|
|4.2.3 System configuration and operational considerations||35|
|Chapter 5||Application of Aqua Drive System||37|
|5.1 Applicable fields of ADS||37|
|5.2 Published ADS applications||38|
|Chapter 6||Future Perspectives of Aqua Drive System||41|
|6.1 Social demand and ADS||41|
|6.2 Market and prospects of ADS||41|
|6.3 Boosting the ADS-related industries||42|
|JFPA Water Hydraulics Committee Members: Companies and Universities||43|
|“ Technical Study on Environmental Friendly Water Hydraulic Drive Systems”
from 1998 to 2000
“ Research and Study for the Practical Use of the Aqua Drive Technology”
from 2001 to 2003
What does the use of tap water pressure mean?
ADS utilizes the pressure of tap water pipe network, namely the pressure of tap water coming out of taps. While there are regional differences, the standard pressure range is 0.15 to 0.74 MPa; the appropriate pressure for ADS is 0.25 to 0.4 MPa. Using this pressure, ADS can drive a variety of water hydraulic components.
Where are water hydraulic components available?
Water hydraulic components for ADS are now developed by and available from many companies. For details, see Chapter 2 of Aqua Drive System – A Technical Guide 2 (available in English and Japanese) and Aqua Drive System – A Technical Guide 3 (available in Japanese only). Visit the URL below and access to the page 17 to download the Guides: http://www.japan-fluid-power.or.jp/pdf/jfpa_whwg2.pdf
What are advantages of using water hydraulics, in addition to environmental benefits?
ADS uses tap water as working fluid and lets only the tap water come out in the event of leakage. Thus, it eliminates the necessity for oil spill equipment, which is generally required for oil hydraulics. ADS is also advantageous in terms of the cost of working fluid; tap water is clearly less expensive than hydraulic oil. ADS has a lower running cost and therefore contributes to reducing the overall cost of system operation.
How are water hydraulic systems used and appreciated by their users?
In Japan, ADS has been adopted in cases where the technology was determined as the best choice through the comprehensive evaluation of cost factors. Though in a few cases, ADS has provided the best total solution under current social and legal circumstances. Changes in the social climate will further highlight the economic advantage of ADS as a total solution. For details, see “Research on the current situation and market forecast of water hydraulic components” (available in Japanese only).
Are there companies that undertake engineering work for system construction, including planning and installation?
See Table 2.1 “Water hydraulic component manufacturers and suppliers” in Chapter 2 of Aqua Drive System – A Technical Guide 2 (available in English and Japanese).