?在化工生產(chǎn)中，液壓閥廣泛用于流體輸送、壓力傳動(dòng)、控制、反應(yīng)等系統(tǒng)中的工作可通過閥體內(nèi)的液體（如油、水）的流動(dòng)，實(shí)現(xiàn)機(jī)械能的傳遞、壓力信號的傳遞，實(shí)現(xiàn)各動(dòng)作過程中動(dòng)力能量的轉(zhuǎn)化其結(jié)構(gòu)形式包括缸體、活塞、傳動(dòng)機(jī)構(gòu)和閥體三部分組成，在整個(gè)工作過程中，控制系統(tǒng)能在一定條件下直接產(chǎn)生壓力變化。
閥體中的壓桿可通過改變閥桿（閥座）與閥芯的相對位置來改變行程它使閥門處于開啟或閉合狀態(tài)，改變閥座上介質(zhì)的流動(dòng)狀態(tài)為關(guān)閉狀態(tài)；也可實(shí)現(xiàn)單向或雙向流動(dòng)以滿足需要當(dāng)介質(zhì)通過時(shí)，閥芯閉合（此時(shí)氣動(dòng)泵不工作);當(dāng)閥內(nèi)有介質(zhì)流出時(shí)關(guān)閉該閥門；當(dāng)介質(zhì)完全流量達(dá)到設(shè)定值時(shí)打開閥門。
這就是氣動(dòng)閥所追求的功能；我們所說到就是壓力或者流量來實(shí)現(xiàn)壓力控制來完成作業(yè)的控制作用裝置；或者是閥門來實(shí)現(xiàn)控制運(yùn)動(dòng)作用或者是壓力功能設(shè)備、或者其它用途具體功能包括以下幾個(gè)方面：使機(jī)械能（如壓力）達(dá)到系統(tǒng)調(diào)節(jié)要求；改變液體流動(dòng)狀態(tài)并實(shí)現(xiàn)功能；控制動(dòng)作；運(yùn)動(dòng)等其他功能。
根據(jù)這些功能不同，系統(tǒng)將進(jìn)行相應(yīng)功能配置；而這就是閥中最主要、最基本的設(shè)備，它包括了液壓油泵及閥體、馬達(dá)、流量調(diào)節(jié)器、壓力元件及驅(qū)動(dòng)元件等部件構(gòu)成系統(tǒng)；其基本結(jié)構(gòu)包括：閥體、閥座導(dǎo)套、閥座孔、密封圈、閥蓋等；閥組組件包括：閥體、密封結(jié)構(gòu)組件（如閥體）、彈簧；其作用是傳遞動(dòng)作介質(zhì)（包括實(shí)現(xiàn)信號）和改變流量方向，它以產(chǎn)生動(dòng)作執(zhí)行機(jī)構(gòu)中執(zhí)行元件所需功能參數(shù)實(shí)現(xiàn)其工作工況條件所要求作用于被動(dòng)件上達(dá)到控制目的而控制其運(yùn)動(dòng)位置。
通過油路實(shí)現(xiàn)工作流動(dòng)和動(dòng)力轉(zhuǎn)換；通過油道提供液體到氣動(dòng)執(zhí)行機(jī)構(gòu)之間，對動(dòng)作起調(diào)節(jié)作用液壓閥根據(jù)所需要運(yùn)動(dòng)介質(zhì)種類可分為通用型、控制型等 90L250-KA-5-BC-80-D-3-C8-L-03-NNN-35-35-24 90L250KA5BC80D3C8L03NNN353524 90-L-250-KA-5-BC-80-D-3-C8-L-03-NNN-35-35-24 90L250KA5BC80D3C8L03NNN353524 90L250-KA-5-BC-80-D-3-F1-L-03-NNN-42-42-20 90L250KA5BC80D3F1L03NNN424220 90-L-250-KA-5-BC-80-D-3-F1-L-03-NNN-42-42-20 90L250KA5BC80D3F1L03NNN424220 90L250-KA-5-BC-80-S-3-C8-J-05-NNN-42-42-24 90L250KA5BC80S3C8J05NNN424224 90-L-250-KA-5-BC-80-S-3-C8-J-05-NNN-42-42-24 90L250KA5BC80S3C8J05NNN424224 90L250-KA-5-BC-80-S-3-C8-K-00-NNN-35-14-30-G005 90L250KA5BC80S3C8K00NNN351430G005 90-L-250-KA-5-BC-80-S-3-C8-K-00-NNN-35-14-30-G005 90L250KA5BC80S3C8K00NNN351430G005 90L250-KA-5-BC-80-S-3-C8-K-03-NNN-32-32-28 90L250KA5BC80S3C8K03NNN323228 90-L-250-KA-5-BC-80-S-3-C8-K-03-NNN-32-32-28 90L250KA5BC80S3C8K03NNN323228 90L250-KA-5-BC-80-S-3-C8-K-03-NNN-42-42-24 90L250KA5BC80S3C8K03NNN424224 90-L-250-KA-5-BC-80-S-3-C8-K-03-NNN-42-42-24 90L250KA5BC80S3C8K03NNN424224 90-L-250-KA-5-BC-80-S-3-F1-J-03-NNN-20-20-24 90L250KA5BC80S3F1J03NNN202024 90L250-KA-5-BC-80-S-3-F1-K-00-NNN-35-14-30 90L250KA5BC80S3F1K00NNN351430 90-L-250-KA-5-BC-80-S-3-F1-K-00-NNN-35-14-30 90L250KA5BC80S3F1K00NNN351430 90L250-KA-5-BC-80-S-4-C8-J-05-NNN-42-42-24 90L250KA5BC80S4C8J05NNN424224 90-L-250-KA-5-BC-80-S-4-C8-J-05-NNN-42-42-24 90L250KA5BC80S4C8J05NNN424224 90-L-250-KA-5-BC-80-S-4-F1-J-03-NNN-35-35-24 90L250KA5BC80S4F1J03NNN353524 90-L-250-KA-5-BC-80-S-4-F1-J-03-NNN-42-42-24 90L250KA5BC80S4F1J03NNN424224 90L250-KA-5-BC-80-T-3-C8-K-03-NNN-38-38-24 90L250KA5BC80T3C8K03NNN383824 90-L-250-KA-5-BC-80-T-3-C8-K-03-NNN-38-38-24 90L250KA5BC80T3C8K03NNN383824 90L250-KA-5-BC-80-T-3-F1-K-03-NNN-38-38-24 90L250KA5BC80T3F1K03NNN383824 90-L-250-KA-5-BC-80-T-3-F1-K-03-NNN-38-38-24 90L250KA5BC80T3F1K03NNN383824 90L250-KA-5-BC-80-T-3-F1-K-06-NNN-38-38-24 90L250KA5BC80T3F1K06NNN383824 90-L-250-KA-5-BC-80-T-3-F1-K-06-NNN-38-38-24 90L250KA5BC80T3F1K06NNN383824 90L250-KA-5-BC-80-T-4-C8-K-03-NNN-32-32-30 90L250KA5BC80T4C8K03NNN323230 90-L-250-KA-5-BC-80-T-4-C8-K-03-NNN-32-32-30 90L250KA5BC80T4C8K03NNN323230 90L250-KA-5-BC-80-T-4-C8-K-03-NNN-35-35-30 90L250KA5BC80T4C8K03NNN353530 90-L-250-KA-5-BC-80-T-4-C8-K-03-NNN-35-35-30 90L250KA5BC80T4C8K03NNN353530 90L250-KA-5-BC-80-T-4-F1-K-03-NNN-26-26-24 90L250KA5BC80T4F1K03NNN262624 90-L-250-KA-5-BC-80-T-4-F1-K-03-NNN-26-26-24 90L250KA5BC80T4F1K03NNN262624 90L250-KA-5-CD-80-S-3-C8-J-03-NNN-42-42-24 90L250KA5CD80S3C8J03NNN424224 90-L-250-KA-5-CD-80-S-3-C8-J-03-NNN-42-42-24 90L250KA5CD80S3C8J03NNN424224 90-L-250-KA-5-CD-80-S-3-C8-K-00-NNN-35-35-24 90L250KA5CD80S3C8K00NNN353524 90L250-KA-5-CD-80-S-3-C8-K-02-NNN-32-32-24 90L250KA5CD80S3C8K02NNN323224 90-L-250-KA-5-CD-80-S-3-C8-K-02-NNN-32-32-24 90L250KA5CD80S3C8K02NNN323224 90L250-KA-5-CD-80-S-3-C8-K-05-NNN-26-26-24 90L250KA5CD80S3C8K05NNN262624 90-L-250-KA-5-CD-80-S-3-C8-K-05-NNN-26-26-24 90L250KA5CD80S3C8K05NNN262624 90L250-KA-5-CD-80-S-3-F1-K-00-NNN-35-14-30 90L250KA5CD80S3F1K00NNN351430 90-L-250-KA-5-CD-80-S-3-F1-K-00-NNN-35-14-30 90L250KA5CD80S3F1K00NNN351430 90L250-KA-5-CD-80-S-3-F1-K-00-NNN-35-35-24 90L250KA5CD80S3F1K00NNN353524 90-L-250-KA-5-CD-80-S-3-F1-K-00-NNN-35-35-24 90L250KA5CD80S3F1K00NNN353524 90L250-KA-5-CD-80-S-4-C8-K-03-NNN-35-35-24 90L250KA5CD80S4C8K03NNN353524 90-L-250-KA-5-CD-80-S-4-C8-K-03-NNN-35-35-24 90L250KA5CD80S4C8K03NNN353524 90L250-KA-5-CD-80-S-4-C8-K-04-NNN-42-42-24 90L250KA5CD80S4C8K04NNN424224 90-L-250-KA-5-CD-80-S-4-C8-K-04-NNN-42-42-24 90L250KA5CD80S4C8K04NNN424224 90L250-KA-5-CD-80-T-3-C8-J-03-NNN-42-42-24 90L250KA5CD80T3C8J03NNN424224 90-L-250-KA-5-CD-80-T-3-C8-J-03-NNN-42-42-24 90L250KA5CD80T3C8J03NNN424224 90L250-KA-5-CD-80-T-3-C8-K-03-NNN-35-35-24 90L250KA5CD80T3C8K03NNN353524 90-L-250-KA-5-CD-80-T-3-C8-K-03-NNN-35-35-24 90L250KA5CD80T3C8K03NNN353524 90L250-KA-5-CD-80-T-3-C8-K-03-NNN-42-42-24 90L250KA5CD80T3C8K03NNN424224 90-L-250-KA-5-CD-80-T-3-C8-K-03-NNN-42-42-24 90L250KA5CD80T3C8K03NNN424224 90L250-KA-5-CD-80-T-3-C8-K-06-NNN-35-35-24 90L250KA5CD80T3C8K06NNN353524 90-L-250-KA-5-CD-80-T-3-C8-K-06-NNN-35-35-24 90L250KA5CD80T3C8K06NNN353524 90L250-KA-5-CD-80-T-3-F1-K-03-NNN-35-35-24 90L250KA5CD80T3F1K03NNN353524 90-L-250-KA-5-CD-80-T-3-F1-K-03-NNN-35-35-24 90L250KA5CD80T3F1K03NNN353524 90L250-KA-5-CD-80-T-3-F1-K-03-NNN-42-42-24 90L250KA5CD80T3F1K03NNN424224 90-L-250-KA-5-CD-80-T-3-F1-K-03-NNN-42-42-24 90L250KA5CD80T3F1K03NNN424224 90L250-KA-5-CD-80-T-4-F1-J-05-NNN-38-38-24 90L250KA5CD80T4F1J05NNN383824 90-L-250-KA-5-CD-80-T-4-F1-J-05-NNN-38-38-24 90L250KA5CD80T4F1J05NNN383824 90-L-250-KA-5-DE-80-S-3-C8-K-02-NNN-26-26-28 90L250KA5DE80S3C8K02NNN262628 90L250-KA-5-DE-80-S-3-C8-K-03-NNN-42-42-24 90L250KA5DE80S3C8K03NNN424224 90-L-250-KA-5-DE-80-S-3-C8-K-03-NNN-42-42-24 90L250KA5DE80S3C8K03NNN424224 90L250-KA-5-DE-80-T-3-C8-K-03-NNN-32-32-24 90L250KA5DE80T3C8K03NNN323224 90-L-250-KA-5-DE-80-T-3-C8-K-03-NNN-32-32-24 90L250KA5DE80T3C8K03NNN323224 90L250-KA-5-EF-80-S-3-C8-K-00-NNN-35-14-30 90L250KA5EF80S3C8K00NNN351430 90-L-250-KA-5-EF-80-S-3-C8-K-00-NNN-35-14-30 90L250KA5EF80S3C8K00NNN351430 90L250-KA-5-EG-80-S-3-C8-K-00-NNN-35-14-30-G005 90L250KA5EG80S3C8K00NNN351430G005 90-L-250-KA-5-EG-80-S-3-C8-K-00-NNN-35-14-30-G005 90L250KA5EG80S3C8K00NNN351430G005 90L250-KA-5-EG-80-S-3-C8-K-03-NNN-35-35-24 90L250KA5EG80S3C8K03NNN353524 。
