进口阿托斯叠加式顺序阀,意大利ATOS叠加式顺序阀
按工作原理和结构，顺序阀分直动式和先导式两类；按压力控制方式，
顺序阀有内控和外控之分。 在顺序阀中装有单向阀，
能通过反向液流的复合阀称为单向顺序阀。一般说来，这种阀使用较多。
顺序阀的启闭特性如果太差，则流量较大时压力过高，回路效率降低。
The basic function of the sequence valve is to control the

sequence of multiple actuators, according to their different functions,
Respectively, called the sequence valve, back pressure valve, unloading valve and balance valve.
Sequential valve performance and relief valve is basically the same,
but because of the different functions of the sequential valve also has its special requirements:
(1) In order to make the implementation of the device to achieve accurate sequence requirements,
the requirements of the valve pressure regulator high precision, small deviation;
(2) in order to order the accuracy of the action required to close the valve when the leakage is small;
(3) For unidirectional sequential valves, reverse pressure loss and forward pressure loss are
required to be small. The main functions of the sequence valve are:
(1) controlling the sequential operation of the plurality of elements;
(2) for the pressure circuit;
(3) to prevent the self-weight caused by the cylinder piston free fall and do with the balance valve;
(4) with the external control valve to do unloading valve, the pump unloading;
(5) with internal control sequence valve for back pressure valve
启闭特性带有滞环，开启压力低于闭合压力，负载流量变化时应予注意。
开启压力过低的阀，再压力低于设定压力时发生前漏，引起执行器误动作。
通过阀的流量远小于额定流量时，产生振动或其他不稳定现象。此时要再回路上采取措施。

进口阿托斯叠加式顺序阀,意大利ATOS叠加式顺序阀