Hydrostatic drive systems

In a hydrostatic drive system with an adjustable pump, whose adjusting element is connected with an adjustable pump piston capable of sliding in an adjustable pump cylinder, the position of the piston which is determined by a pressure medium controlled by a servo control valve, at least one consumer of hydrostatic energy in the drive system and a delivery line between the pump and the consumer of hydrostatic energy, as well as a return line leading to the tank, and where several consumers are connected through one branch line each to the delivery line coming from the pump, an arbitrarily actuatable switching element located in each branch line, the improvement comprising in combination:

• (a) an adjustable parallel-connecting restrictor located in each branch line, an adjustable element in each said restrictor, the adjusting element of each of said parallel-connecting restrictors being loaded on one side by the pressure in one of the delivery line or the branch delivery line and on the other side by a control pressure and a spring;
• and
• (b) means providing a common control pressure at all the parallel-connecting restrictors on one side of the adjusting element, said one side of the adjusting element being connected through a branch control pressure line to a common control pressure line, and a check valve opening toward the common control pressure line located in each branch control pressure line.