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派克導(dǎo)式比例換向閥,美派克比例換向閥
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\39529831\39529839\39529829-8007或者8008
直線傳真;60831958/60831959(優(yōu))
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;單/余
派克導(dǎo)式比例換向閥原理主要用來(lái)控制流體。例1個(gè)活塞向1個(gè)方向移動(dòng)。要向1端充流體,另1端排流體,進(jìn)的1端是高壓流體,出的1端回到油箱。這1個(gè)動(dòng)作要求進(jìn)端閥打開,排(回)流閥關(guān)閉,另1端進(jìn)端閥關(guān)閉,打開排(回)流閥關(guān)閉?;钊哪芟?個(gè)方向移動(dòng)。目前現(xiàn)成產(chǎn)品有2位3通,2位4通,3位5通等。換向閥原理,是根據(jù)壓力系統(tǒng)的工作壓力自動(dòng)啟閉,一般安裝于封閉系統(tǒng)的設(shè)備或管路上保護(hù)系統(tǒng)安全。當(dāng)設(shè)備或管道內(nèi)壓力超過(guò)安全閥設(shè)定壓力時(shí),即自動(dòng)開啟泄壓,設(shè)備和管道內(nèi)介質(zhì)壓力在設(shè)定壓力之下,保護(hù)設(shè)備和管道正常工作,防止發(fā)生意外,減少損失。
與閘閥相比有開閉時(shí)間短,操作為矩小,安裝空間小和重量輕。以DN1000為例,換向閥約2T,而閘閥約3.5T,且換向閥易與各種驅(qū)動(dòng)裝置組合,有良好的耐久性和可靠性。 橡膠軟密封換向閥缺點(diǎn)是作節(jié)流使用時(shí),由于使用不當(dāng)會(huì)產(chǎn)生氣蝕,使橡膠座剝落、損傷等情況發(fā)生。為此,現(xiàn)在際上又開發(fā)金屬硬密封換向閥,氣蝕區(qū)減小,近幾年我也開發(fā)了金屬硬密封換向閥,在日本近年來(lái)還開發(fā)耐氣蝕、低振動(dòng)、低噪聲的梳齒形換向閥。
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派克導(dǎo)式比例換向閥,美派克比例換向閥
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