原文：
1.1工作原理：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。 1.2功能及应用：顺序阀的基本功能是控制多个执行元件的顺序动作，根据其功能的不同，分别称为顺序阀、背压阀、卸荷阀和平衡阀。 顺序阀的性能与溢流阀基本相同，但由于功能的不同，对顺序阀还有其特殊的要求： （1）为了使执行元件准确实现顺序动作，要求顺序阀的调压精度高，偏差小； （2）为了顺序动作的准确性，要求阀关闭时内泄漏量小； （3）对于单向顺序阀，要求反向压力损失及正向压力损失值均应较小。 顺序阀的主要作用有： （1）控制多个元件的顺序动作； （2）用于保压回路； （3）防止因自重引起油缸活塞自由下落而做平衡阀用； （4）用外控顺序阀做卸荷阀，使泵卸荷； （5）用内控顺序阀作背压阀。 1.3生产顺序阀产品厂家：国内主要是榆次液压集团有限公司、北京华德液压集团有限公司、上海立新液压件厂等。国外有美国Vickers、德国Rexroth等厂家。 1.4顺序阀的选用：顺序阀根据装配结构的不同，可以实现不同的回路功能，如溢流阀、顺序阀和平衡阀的功能。 顺序阀的启闭特性如果太差，则流量较大时一次压力过高，回路效率降低。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。

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1.1 How it works: according to the principle and structure, sequence valve direct-acting type and the pilot sub-type categories; by pressure control mode, the order of internal control and external control valve are divided. In order valves with check valve, reverse flow through the complex one-way valve called the sequence valve. In general, this valve to use more. 1.2 Function and application: the order of the basic function is to control valve actuators order multiple actions, according to their different functions, are called sequence valve, back pressure valves, unloading valve and the balancing valve. Sequence valve and pressure relief valve is basically the same performance, but with different functions, on the order of valve, there are also special requirements: (1) In order to achieve accurate implementation of the order of action components require high precision, the order of the pressure regulator valve, small deviation; (2) To the accuracy of the order of actions, demands within the valve off a small amount of leakage; (3) one-way valves in order to require the reverse pressure loss and pressure loss values should be less positive. The main functions of the order of valves: (1) control over the order of movement components; (2) for packing circuit; (3) to prevent fuel tank caused due to dead weight piston free-fall and do balancing valve with; (4) foreign-controlled sequence valve of unloading valves, the pump unloading; (5) with the internal control sequence valve is used as back-pressure valve. 1.3 Production sequence valve product manufacturers: domestic mainly Yuci hydraulic Group Ltd., Beijing, China and Germany hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Parts, etc.. Overseas, the United States Vickers, Rexroth, Germany and other manufacturers. 1.4 Selection of the order of valves: sequence valve assembly structure according to the different, you can implement different circuit functions, such as relief valve, sequence valve and balancing valve function. Characteristics of the valve opening and closing sequence if bad, then the flow of a larger pressure is too high, reduce the circuit efficiency. With the hysteresis characteristics of opening and closing, opening pressure is less than the pressure, load flow changes should be noted. Valve opening pressure is too low, then the pressure below the set pressure before the leak occurred, causing the actuator malfunction. The flow through the valve is much smaller than the rated flow, vibration, or other instability. Take measures to return to the road at this time.