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溢(yi)(yi)流(liu)(liu)(liu)閥(fa)(fa)(fa)是(shi)一種(zhong)液(ye)壓(ya)(ya)(ya)(ya)(ya)壓(ya)(ya)(ya)(ya)(ya)力控制閥(fa)(fa)(fa)。在(zai)液(ye)壓(ya)(ya)(ya)(ya)(ya)設備中(zhong)(zhong)(zhong)主(zhu)(zhu)要起定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)溢(yi)(yi)流(liu)(liu)(liu)作(zuo)(zuo)用和(he)(he)安(an)全保護作(zuo)(zuo)用。定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)溢(yi)(yi)流(liu)(liu)(liu)作(zuo)(zuo)用:在(zai)定(ding)(ding)量(liang)泵節流(liu)(liu)(liu)調節系(xi)統中(zhong)(zhong)(zhong),定(ding)(ding)量(liang)泵提供(gong)的(de)是(shi)恒(heng)定(ding)(ding)流(liu)(liu)(liu)量(liang)。當系(xi)統壓(ya)(ya)(ya)(ya)(ya)力增(zeng)大(da)時,會使流(liu)(liu)(liu)量(liang)需(xu)求減小。此(ci)時溢(yi)(yi)流(liu)(liu)(liu)閥(fa)(fa)(fa)開啟,使多(duo)余流(liu)(liu)(liu)量(liang)溢(yi)(yi)回(hui)油(you)箱,保證溢(yi)(yi)流(liu)(liu)(liu)閥(fa)(fa)(fa)進口(kou)壓(ya)(ya)(ya)(ya)(ya)力,即泵出口(kou)壓(ya)(ya)(ya)(ya)(ya)力恒(heng)定(ding)(ding)(閥(fa)(fa)(fa)口(kou)常(chang)隨壓(ya)(ya)(ya)(ya)(ya)力波(bo)動(dong)開啟)。液(ye)壓(ya)(ya)(ya)(ya)(ya)裝置中(zhong)(zhong)(zhong)容易產(chan)生(sheng)(sheng)噪聲(sheng)的(de)元(yuan)件一般認為是(shi)泵和(he)(he)閥(fa)(fa)(fa),閥(fa)(fa)(fa)中(zhong)(zhong)(zhong)又以(yi)溢(yi)(yi)流(liu)(liu)(liu)閥(fa)(fa)(fa)電(dian)磁換向閥(fa)(fa)(fa)等為主(zhu)(zhu)。產(chan)生(sheng)(sheng)噪聲(sheng)的(de)因(yin)(yin)素(su)很多(duo)。溢(yi)(yi)流(liu)(liu)(liu)閥(fa)(fa)(fa)的(de)噪聲(sheng)有流(liu)(liu)(liu)速(su)聲(sheng)和(he)(he)機械聲(sheng)二種(zhong)。流(liu)(liu)(liu)速(su)聲(sheng)中(zhong)(zhong)(zhong)主(zhu)(zhu)要由油(you)液(ye)振動(dong)、空穴以(yi)及液(ye)壓(ya)(ya)(ya)(ya)(ya)沖擊等原因(yin)(yin)產(chan)生(sheng)(sheng)的(de)噪聲(sheng)。機械聲(sheng)中(zhong)(zhong)(zhong)主(zhu)(zhu)要由閥(fa)(fa)(fa)中(zhong)(zhong)(zhong)零件的(de)撞擊和(he)(he)磨擦等原因(yin)(yin)產(chan)生(sheng)(sheng)的(de)噪聲(sheng)。
穩壓作用溢流閥串聯在回油路上,溢流閥產生背壓,運動部件平穩性增加。
系統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。
安全保護作用系統正常工作時,閥門關閉。只有負載超過規定的極限(系統壓力超過調定壓力)時開啟溢流,進行過載保護,使系統壓力不再增加(通常使溢流閥的調定壓力比系統zui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、先導式溢流閥。
對溢流閥(fa)的主要要求(qiu)調(diao)壓(ya)范圍大(da),調(diao)壓(ya)偏(pian)差小,壓(ya)力(li)振擺小,動作靈敏,過載能力(li)大(da),噪聲(sheng)小。
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