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norgren調(diào)壓閥出廠時設(shè)置閥芯位置為全開，當(dāng)有壓流體介質(zhì)流經(jīng)閥門后，閥后管道內(nèi)壓力慢慢升高到預(yù)置調(diào)節(jié)壓力值的同時，介質(zhì)通過預(yù)先安裝在調(diào)壓閥膜片或活塞執(zhí)行機(jī)構(gòu)和閥后管道之間連接的引壓銅管（或不銹鋼管）實(shí)現(xiàn)引壓作用，使調(diào)壓閥執(zhí)行機(jī)構(gòu)內(nèi)產(chǎn)生相應(yīng)的壓力，然后通過和執(zhí)行機(jī)構(gòu)連接的閥桿產(chǎn)生推力來克服閥桿填料摩擦力和調(diào)壓閥彈簧預(yù)緊力從而使閥芯產(chǎn)生上下直線運(yùn)動來控制閥芯的開度以調(diào)節(jié)改變介質(zhì)壓差和流量，實(shí)現(xiàn)調(diào)壓的目的。當(dāng)閥后介質(zhì)壓力值升高超過設(shè)定調(diào)節(jié)壓力時，執(zhí)行機(jī)構(gòu)產(chǎn)生的下推力增大，閥芯向下直線位移使閥門開度減小，隨之閥后介質(zhì)壓力相應(yīng)下降；當(dāng)閥后介質(zhì)壓力值減小到低于調(diào)壓閥設(shè)定壓力時，執(zhí)行機(jī)構(gòu)產(chǎn)生的下推力減小，閥芯依靠調(diào)壓閥彈簧預(yù)緊力產(chǎn)生的向上推力，克服執(zhí)行機(jī)構(gòu)產(chǎn)生的下推力和閥桿摩擦力后，使閥芯向上運(yùn)動，閥門開度增大改變介質(zhì)壓差和流量，使閥后介質(zhì)壓力又向上回升，趨于接近調(diào)壓閥設(shè)定壓力值。這樣周而復(fù)始，循環(huán)動態(tài)調(diào)節(jié)，使調(diào)壓閥zui終實(shí)現(xiàn)調(diào)壓穩(wěn)壓作用。
norgren調(diào)壓閥%英國諾冠
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