After the analysis of function and dimension of regulator used in some hydraulic winches, the main parameters that affect the performance of valve were proved to be spool diameter, spool rod diameter, spring coefficients on the spool-ended, spring initial force, the clearance between the spool and the sleeve and the overlap length of the spool and the sleeve. Hydraulic circuit and inner flow analysis was conducted by commercial program AMESim and ANSYS CFX to predict the valve behavior by changing design parameters for the valve system. For confirmation, this simulation result was compared with experimental one. The valve behaviors accroding to the design parameters were predicts as following results: Spool position is primarity determined by spring coefficients and spring initial force. Leakage and pressure characteristics in the valve are influenced mainly by the overlap length of the spool and the sleeve. The clearance between the spool and the sleeve is the main cause for leakage and pressure characteristics in the valve.
In addition, flow force is determined by the shape of spool. Since the validity of this simulation model was confirmed, the result of this study can be applied to design new regulators of various hydraulic winches.