Gear pump 1 delivers fluid from the tank to power cylinder 2 through coil 3, serving to compensate for the influence of the viscosity of the fluid, and flow-control valve 4, serving to compensate for the variable workinglly load of the machine tool. Flow-control valve 4 is set manually to obtain the required speed of travel of machine tool table 6. Valve spool 5 is automatically controlled by fluid from branch lines of the main delivery pipeline. Coil 3 passes the total volume of fluid and it can be assumed that the pressure drop over the coil depends only on the viscosity of the fluid. Upon an increase in viscosity the pressure drop increases, valve spool 5 is shifted downward, blocking off fluid drain to the tank and thereby reducing the pressure drop over coil 3. The working portion of the fluid, determining the speed of travel of table 6, passes through flow- control valve 4. If the working load on table 6 drops and the speed of the table begins to increase, valve spool 5 is shifted upward, increasing the discharge of fluid to the tank and stopping the increase in table speed. In case the fluid viscosity is reduced or the working load is increased, valve spool 5 is automatically shifted upward or downward, respectively.
$4149$CHP,Dr$