0
TECHNICAL PAPERS

Development of a Nozzle-Flapper-Type Servo Valve Using a Slit Structure

[+] Author and Article Information
Kenji Kawashima, Chongho Youn

Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa Prefecture, 226-8503 Japan

Toshiharu Kagawa

Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa Prefecture, 226-8503 Japankkawashi@pi.titech.ac.jp

J. Fluids Eng 129(5), 573-578 (Nov 06, 2006) (6 pages) doi:10.1115/1.2717617 History: Received November 11, 2005; Revised November 06, 2006

Pneumatic servo valves play a significant role in power transmission and system control using a pressurized gas. When pressurized air passes through servo valves, noise and pressure fluctuations are often experienced at the downstream side, and such fluctuations limit the value’s efficiency. In this paper, a novel four-port nozzle-flapper-type servo valve using a slit structure instead of an orifice plate is proposed. The slit structure maintains a laminar flow condition, and this provides an opportunity for the minimization of the noise and pressure fluctuations. The slit structure is fabricated using etching technology. The flow characteristics of the slit are investigated theoretically and experimentally in order to evaluate the design specifications and characteristics of the valve. The experimental results indicated that the noise level decreased by approximately 15dB and could reduce the pressure fluctuation by 75%, compared with the previous valve. It is felt that the valve is more effective than many current valves.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Drawing of the slit structure

Grahic Jump Location
Figure 2

3D sectional cut view of the developed slit

Grahic Jump Location
Figure 3

Experimental apparatus to measure flow characteristics

Grahic Jump Location
Figure 4

Flow characteristics of the slit structure

Grahic Jump Location
Figure 5

Structure of four-port nozzle-flapper type servo valve (top: proposed valve; bottom: ordinal valve)

Grahic Jump Location
Figure 6

Relationship between the height and the inner diameter of the slit structure

Grahic Jump Location
Figure 7

Developed four-port nozzle-flapper-type servo valve with a slit structure

Grahic Jump Location
Figure 8

Photograph of the developed four-port nozzle-flapper-type servo valve (left: overall view; right: bottom side)

Grahic Jump Location
Figure 9

Experimental apparatus

Grahic Jump Location
Figure 10

Static characteristics of the previous servo valve

Grahic Jump Location
Figure 11

Static characteristics of the developed servo valve

Grahic Jump Location
Figure 12

Frequency response of the differential pressure measured at 0mA dc input superimposed by a ±5mA sinusoid

Grahic Jump Location
Figure 13

Experimental system to measure noise

Grahic Jump Location
Figure 14

Noise level of previous valves and the present valve

Grahic Jump Location
Figure 15

Fluctuation of pressure

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In