ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 30 March 2005
Page Count: 3

Evaluation of Hydraulic Pressure Drop using Manganin Wire and a Wiper-Cam-Operated Directional Valve

Tsung, T-T
Graduate Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei,

Han, L-L
Graduate Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei,

(Received 28 July 2004; accepted 20 August 2004)

Abstract

In this paper, we have constructed equipment to be effective in generating a hydraulic pressure drop that can be employed as a step function, mainly by means of a cam mechanism that operates a spool-type directional control valve and measures the pressure with a manganin wire and a Wheatstone bridge system. The wiper cam is specially designed to operate a hydraulic piston with quick return and to generate a pressure drop in the testing chamber within an extremely short time. Results show the pressure drop from 250 bars to zero requires only 0.45 ms. Furthermore, we also compare the characteristics of pressure drop with various chamber volumes and spool valve overlaps. Results show the best pressure-drop rate when the chamber volume and overlap are 4 cm³ and 4 mm, respectively.

Keywords:
pressure drop, directional control valve, manganin, Wheatstone bridge, wiper cam

Paper ID: JTE12689
DOI: 10.1520/JTE12689
ASTM International is a member of CrossRef.