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減壓閥選擇依據(jù)及其注意事項
選擇減壓閥的主要依據(jù)是它們在系統(tǒng)中的作用、額定壓力、最大流量、壓力損失數(shù)值、工作性能參數(shù)和使用壽命等。通常按照液壓系統(tǒng)的最大壓力和通過閥的流量,從産品樣本中選擇減壓閥的規(guī)格(壓力等級和通徑)。下面來看下其注意事項。
1)減壓閥的調(diào)定壓力根據(jù)其工作情況而決定,注意減壓閥不能控制輸出油液流量的大小,當減壓后的流量需要控制時,應另設流量控制閥。減壓閥的流量規(guī)格應由實際通過該閥的最大流量選取,在使用中不宜超過額定流量。
2)減壓閥的各項性能指標對液壓系統(tǒng)都有影響,可根據(jù)系統(tǒng)的要求按樣本上的性能曲線選用減壓閥。
3)可根據(jù)系統(tǒng)性能要求選擇閥的結(jié)構形式,如低壓系統(tǒng)可選用直動型壓力閥,而中高壓系統(tǒng)應選用先導型壓力閥。根據(jù)空間位策、管路布置等情況選用闆式、管式或登加式連接的減壓閥。
4)對于接入控制油路上的各類壓力閥,由于通過的實際流量很小,因此可按該閥的最小額定流量規(guī)格選取,使液壓裝置結(jié)構緊湊。
5)注意減壓閥的最低調(diào)節(jié)壓力,應保證一次壓力與二次壓力之差爲0.3一1MPa。
6)要注意先導式減壓閥的洩漏量比其他控制閥大的情況。這種閥的洩漏量可高達1L/min以上,而且隻要閥處于工作狀態(tài),洩漏始終存在。在選擇液壓泵容量時,要充分考慮到這一點。
7)也要注意,不要使通過減壓閥、順序閥的流量遠小于其額定流量,否則,易産生振動或其他不穩(wěn)定現(xiàn)象。這時,要在回路上采取必要的措施。
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