Application of non circular throttling grooves on multi way valve of forklift
                                               XIE Jiang wei, LIU Yi chen, CHEN Yin, YUAN Xiao peng, YU Jin
                            （Zhejiang Huachang Hydraulic Machinery Co., Ltd., Hangzhou 311305, China）

Abstract: Aiming at the requirements of the micro dynamic characteristics of forklift s multi channel valve, the flow area of non circular throttling grooves was analyzed on some kind of forklift  multi way valves, referred to the characteristic parameters of the pressure and flow which formed by the valve core displacements and oil openings, the existing U notch was simulationed and analyzed by MathCAD software, date of the U notch opened and closed were got by test equipment, the data of simulated and calculated were compared with the actual theoretical testing data, it created a more accurate simulation model. The results indicate that the types and distribution of throttling slots for forklift multi valve core could be designed and studied rapidly by simulated.The micro dynamic characteristics of forklift s multi channel valve was got by equipments, it could improve the control characteristics of forklift s multi channel valve, reduce the research times, develop more kind of throttle grooves.

Key words: multi way valve; micro dynamic characteristics; orifice area; notchs; experimental verification