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低压系统中使用直动式压力阀来调节和稳定系统的压力。压力阀和其进、出油管组成调压回路。对调压回路的要求,就静特性而言,主要是静态压力误差要小,即通过阀的流量Q_1由Q_1≈0变化到阀的额定流量Q_u时,节点E处(图1)的压力P_5的变化△P_(sm)要小。
Low-pressure systems use direct-acting pressure valves to regulate and stabilize system pressure. The pressure valve and its inlet and outlet tubing form a pressure regulating circuit. The requirements on the pressure regulating circuit are mainly static pressure error in terms of static characteristics, that is, the pressure P_5 at the node E (FIG. 1) when the flow Q_1 of the valve changes from Q_1≈0 to the rated flow Q_u of the valve The change △ P_ (sm) should be small.