?在化工生產(chǎn)中，液壓閥廣泛用于流體輸送、壓力傳動、控制、反應等系統(tǒng)中的工作可通過閥體內(nèi)的液體（如油、水）的流動，實現(xiàn)機械能的傳遞、壓力信號的傳遞，實現(xiàn)各動作過程中動力能量的轉(zhuǎn)化其結(jié)構(gòu)形式包括缸體、活塞、傳動機構(gòu)和閥體三部分組成，在整個工作過程中，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)的流動狀態(tài)為關(guān)閉狀態(tài)；也可實現(xiàn)單向或雙向流動以滿足需要當介質(zhì)通過時，閥芯閉合（此時氣動泵不工作);當閥內(nèi)有介質(zhì)流出時關(guān)閉該閥門；當介質(zhì)完全流量達到設定值時打開閥門。
這就是氣動閥所追求的功能；我們所說到就是壓力或者流量來實現(xiàn)壓力控制來完成作業(yè)的控制作用裝置；或者是閥門來實現(xiàn)控制運動作用或者是壓力功能設備、或者其它用途具體功能包括以下幾個方面：使機械能（如壓力）達到系統(tǒng)調(diào)節(jié)要求；改變液體流動狀態(tài)并實現(xiàn)功能；控制動作；運動等其他功能。
根據(jù)這些功能不同，系統(tǒng)將進行相應功能配置；而這就是閥中最主要、最基本的設備，它包括了液壓油泵及閥體、馬達、流量調(diào)節(jié)器、壓力元件及驅(qū)動元件等部件構(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；其作用是傳遞動作介質(zhì)（包括實現(xiàn)信號）和改變流量方向，它以產(chǎn)生動作執(zhí)行機構(gòu)中執(zhí)行元件所需功能參數(shù)實現(xiàn)其工作工況條件所要求作用于被動件上達到控制目的而控制其運動位置。
通過油路實現(xiàn)工作流動和動力轉(zhuǎn)換；通過油道提供液體到氣動執(zhí)行機構(gòu)之間，對動作起調(diào)節(jié)作用液壓閥根據(jù)所需要運動介質(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 。
