先導式溢流閥的工作原理： 工作時，液壓力同時作用于主閥芯及先導閥芯的測壓面上。當先導閥1未打開時，閥腔中油液沒有流動，作用在主閥芯6上下兩個方向的壓力相等，但因上端面的有效受壓面積A2大于下端面的有效受壓面積A1，主閥芯在合力的作用下處于最下端位置，閥口關閉。當進油壓力增大到使先導閥打開時，液流通過主閥芯上的阻尼孔5、先導閥1流回油箱。由于阻尼孔的阻尼作用，使主閥芯6所受到的上下兩個方向的液壓力不相等，主閥芯在壓差的作用下上移，打開閥口，實現溢流，并維持壓力基本穩(wěn)定。調節(jié)先導閥的調壓彈簧9，便可調整溢流壓力。北京華德液壓全系列 具體型號及報價請聯系客服 ? ? ? ? ?
北京華德先導式溢流閥部分型號：
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北京華德先導式溢流閥部分型號：
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北京華德液壓全系列 具體型號及報價請聯系客服
北京華德先導式溢流閥部分型號：
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華德電磁換向閥 ?華德電磁閥 ? ? ?華德換向閥 ? ? ?華德液動換向閥
華德手動換向閥 ?華德電液換向閥 ?華德滾輪換向閥 ?華德電磁溢流閥
華德先導溢流閥 ?華德直動溢流閥 ?華德疊加溢流閥 ?華德電液溢流閥
華德單向閥 ? ? ?華德液控單向閥 ?華德板式單向閥 ?華德減壓閥
華德直動式減壓閥，均有現貨。如有客戶需求，歡迎來電咨詢！
北京華德液壓全系列 具體型號及報價請聯系客服
北京華德先導式溢流閥部分型號：
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中文名稱：溢流閥 ??英文名稱：pressure ??relief ??valve;overflow ??valve ??定義：維持閥進口壓力近于恒定，系統(tǒng)中多余的流體通過該閥回流的壓力控制閥。一種液壓壓力控制閥。在液壓設備中主要起定壓溢流作用，穩(wěn)壓，系統(tǒng)卸荷和安全保護作用。 ???定壓溢流作用：在定量泵節(jié)流調節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當系統(tǒng)壓力增大時，會使流量需求減小。此時溢流閥開啟，使多余流量溢回油箱，保證溢流閥進口壓力，即泵出口壓力恒定（閥口常隨壓力波動開啟）。 ????穩(wěn)壓作用：溢流閥串聯在回油路上，溢流閥產生背壓運動部件平穩(wěn)性增加。 ????系統(tǒng)卸荷作用：在溢流閥的遙控口串接溢小流量的電磁閥，當電磁鐵通電時，溢流閥的遙控口通油箱，此時液壓泵卸荷。溢流閥此時作為卸荷閥使用。 ????安全保護作用：系統(tǒng)正常工作時，閥門關閉。只有負載超過規(guī)定的極限（系統(tǒng)壓力超過調定壓力）時開啟溢流，進行過載保護，使系統(tǒng)壓力不再增加（通常使溢流閥的調定壓力比系統(tǒng)最高工作壓力高10%～20%）。 ????實際應用中一般有：作卸荷閥用，作遠程調壓閥，作高低壓多級控制閥，作順序閥，用于產生背壓（串在回油路上）。 ????溢流閥一般有兩種結構：1、直動型溢流閥 ??。2、先導型溢流閥。 ????對溢流閥的主要要求：調壓范圍大，調壓偏差小，壓力振擺小，動作靈敏，過載能力大，噪聲小。
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