| 摘要 |
A hydraulic control system particularly suitable for controlling the acceleration and velocity of a load such as the plunger of die casting equipment is described. The load is controlled by a hydraulic ram which in turn is controlled by a main valve of the kind in which the rate of flow of fluid to the load is directly proportional to the rate of flow of pilot fluid thereto. Pilot fluid flows through an auxiliary valve and a restrictor. The restrictor is adjusted to determine the maximum rate of flow and the rate at which the auxiliary valve opens is adjusted to determine the rate of change of flow.
|
