1.58 HYDRAULICS Constant volumetric flow During operation of a consumer with a constant load (e.g. hydraulic motor), the volumetric flow controller (3) is actuated into a stable position. The following pressure conditions then exist at the volumetric flow controller (3) : Load pressure (signal pressure) plus the spring force of stand-by pressure spring (17) act on the left-hand face. The pump pressure acts on the right hand side. The difference in pressure is the stand-by pressure, which corresponds to the force of pressure spring (17). The stand-by pressure should be 20 bar (290 psi); it can be set with adjustment screw (19). 9. LS pump (2) 1. LS compensator (3) 3.
Volumetric flow controller 17. Pressure spring (stand-by pressure) 19. Adjustment screw AA Supply oil BB Oil at reduced pressure DD Control oil EE Oil from charge oil LL Tank