In this paper, hydraulic control valve, pressure relief-valve and main spool valve used in hydraulic plant has been
studied.Hydraulic control valve is essential in agriculture field. Hydraulic control valve is used for lifting and lowering the load.
In this work, testing machine is developed for testing of control valve. In existing control valve testing machine, there are 8
parameters which has been tested before sending control valve to pre-dispatched inspection zone. These parameters are tested in
control valve test rig section and then again in Varry Touch Unit section at 30LPM oil flow.
