SEEHONG磁性开关YIDA-73R YIDA-03R 32R 磁簧开关 感应开关
减压阀选择依据及其注意事项
选择减压阀的主要依据是它们在系统中的作用、额定压力、最大流量、压力损失数值、工作性能参数和使用寿命等。通常按照液压系统的最大压力和通过阀的流量,从産品样本中选择减压阀的规格(压力等级和通径)。下面来看下其注意事项。
1)减压阀的调定压力根据其工作情况而决定,注意减压阀不能控制输出油液流量的大小,当减压后的流量需要控制时,应另设流量控制阀。减压阀的流量规格应由实际通过该阀的最大流量选取,在使用中不宜超过额定流量。
2)减压阀的各项性能指标对液压系统都有影响,可根据系统的要求按样本上的性能曲线选用减压阀。
3)可根据系统性能要求选择阀的结构形式,如低压系统可选用直动型压力阀,而中高压系统应选用先导型压力阀。根据空间位策、管路布置等情况选用闆式、管式或登加式连接的减压阀。
4)对于接入控制油路上的各类压力阀,由于通过的实际流量很小,因此可按该阀的最小额定流量规格选取,使液压装置结构紧凑。
5)注意减压阀的最低调节压力,应保证一次压力与二次压力之差爲0.3一1MPa。
6)要注意先导式减压阀的洩漏量比其他控制阀大的情况。这种阀的洩漏量可高达1L/min以上,而且隻要阀处于工作状态,洩漏始终存在。在选择液压泵容量时,要充分考虑到这一点。
7)也要注意,不要使通过减压阀、顺序阀的流量远小于其额定流量,否则,易産生振动或其他不稳定现象。这时,要在回路上采取必要的措施。
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