NORGREN氣缸型號市場需求量沒達到足以引以他們的興趣。實際上我們的油庫采用國內生產的大流量的雙聯組合閥，效果會好得多。雙聯組合閥還常用來控制溫度、壓力、液位等參數。大閥保證基礎量，小閥提供補償量。在參數相對穩定的系統中，這種位式控制能達相當高精度。好些參數變化較大的系統，變化的速率仍受一定制約，例如溫度控制系統，仍受熱慣性的影響。所以運用得當的雙聯組合閥在滿足控制要求的前提下相對于調節閥能大幅降低成本。

     NORGREN氣缸型號平時不通電，處于微啟狀態，閥門提供初始流量；給一種電信號，電磁閥全開，提供大流量；給另種電信號，閥門關閥。閥門還帶有手動裝置， 使得長期關閥時也不需耗電。三位電磁閥可視為一種結構更為緊湊的雙聯電磁閥，它很方便地實現三位調節，得到了很多應用。進一步的思路是n個大小成一定比例的電磁閥組成2n種流量,類似于數字電路稱這種組合閥為數字閥。

https://www.norgren.com/cn/info/27/%E6%95%B0%E6%8D%AE%E8%A1%A8
Norgren諾冠氣缸PRA/182080/M/40         PRA/182080/M/295              PRA/182080/M/340
Norgren諾冠氣缸PRA/182080/M/70         PRA/182080/M/130              PRA/182080/M/710
Norgren諾冠氣缸PRA/182080/X2/500      PRA/182080/M/700              PRA/182080/M/36
Norgren諾冠氣缸TPRA/182080/M/75              PRA/182080/M/145             PRA/182080/M/320/D
Norgren諾冠氣缸PRA/182080/200/UR/UF                            PRA/182080/300/UR/UF
Norgren諾冠氣缸PRA/182080/M/170/D2/F                    PRA/182080/M/200//D2/F
Norgren諾冠氣缸PRA/182080/M/125/D2/F                    PRA/182080/M/1600
Norgren諾冠氣缸PRA/182080/M/1000/F          PRA/182080/M/320       PRA/182080/125/D/F
Norgren諾冠氣缸PRA/182080/M/1000/M/C     PRA/182080/200           PRA/182080/125
Norgren諾冠氣缸PRA/182080/MU/1000/300                  PRA/182080/MU/1000/130
Norgren諾冠氣缸PRA/182080/MU/1000/330                  PRA/182080/TM/80&20
Norgren諾冠氣缸PRA/182080/M/170/D/F                      PRA/182080/M/200/D/F
Norgren諾冠氣缸PRA/182080/M/125/D/F        PRA/182080/N1/50       PRA/182080/M/405
Norgren諾冠氣缸PRA/182080/MU/1000/80      PRA/182080/270           PRA/182080/M/300
Norgren諾冠氣缸PRA/182080/M/180                     PRA/182080/420                 PRA/182080/400
Norgren諾冠氣缸PRA/182080/M/1450             PRA/182080/M/250       PRA/182080/M/75

PRA/182063/MT/200/200      PRA/182063/X2/80       TPRA/182063/M/125
Norgren諾冠氣缸PRA/182063/M/1800      PRA/182063/M/1280/C         PRA/182063/N2/160
Norgren諾冠氣缸PRA/182080/M/400              PRA/182080/M/160             PRA/182080/M/350
Norgren諾冠氣缸PRA/182080/M/200              TPRA/182080/M/100           TPRA/182080/M/125
Norgren諾冠氣缸PRA/182080/M/950              PRA/182080/M/100             PRA/182080/M/165
Norgren諾冠氣缸PRA/182080/850           PRA/182080/200/D/UF         PRA/182080/100
Norgren諾冠氣缸PRA/182080/125/D/UF         PRA/182080/250           PRA/182080/500
Norgren諾冠氣缸PRA/182080/M/80         PRA/182080/X2/320            PRA/182080/X2/460
Norgren諾冠氣缸TPRA/182080/M/75/G           PRA/182080/M/1000     PRA/182080/JM/210
Norgren諾冠氣缸PRA/182080/M/220              PRA/182080/M/800              PRA/182080/M/50
Norgren諾冠氣缸PRA/182080/J/75           PRA/182080/M/260              PRA/182080/50
Norgren諾冠氣缸PRA/182080/L4/1450            PRA/182080/M/125              PRA/182080/450
Norgren諾冠氣缸PRA/182080/800           PRA/182080/MU/800/160     PRA/182080/M/450

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