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    諾冠無桿氣缸自保持型電磁閥就是只需瞬間通電即完成閥門開關動作,閥芯位置不需電來保持。它的優點在于節約能源尤其是用電池作電源的場合，而且可不考慮溫升，從而線圈壽命長，在高低溫、防爆等場合有較高安全性。常見的有機械式保持和永磁體保持，又分雙線圈和單線圈，以單線圈磁保持結構zui為簡單。它是以改變直流電源極性改變對應閥門開關的兩種狀態。這種電磁閥單獨安裝線圈外部接線需加轉換開關，而與智能儀表配套則十分方便。IC卡預收費煤氣表和水表所配的電磁閥是儀表成敗的關鍵之一，其中的自保持技術又是電磁閥的成敗的重要因素。

   諾冠無桿氣缸活塞通過磁力帶動缸體外部的移動體做同步移動。它的工作原理：在活塞上安裝一組高強磁性的*磁環，磁力線通過薄壁缸筒與套在外面的另一組磁環作用，由于兩組磁環磁性相反，具有很強的吸力。當活塞在缸筒內被氣壓推動時，則在磁力作用下，帶動缸筒外的磁環套一起移動。氣缸活塞的推力必須與磁環的吸力相適應。

諾冠無桿氣缸型號：
Norgren諾冠氣缸PRA/182040/M/310              PRA/182040/M/580              PRA/182040/M/50
Norgren諾冠氣缸PRA/182040/M/90         PRA/182040/50                   PRA/182040/M/225
Norgren諾冠氣缸PRA/182040/M/400              PRA/182040/M/650              PRA/182040/150
Norgren諾冠氣缸PRA/182040/M/255              PRA/182040/M/350             PRA/182040/M/250
Norgren諾冠氣缸PRA/182040/M/450              PRA/182040/M/235             PRA/182040/M/305
Norgren諾冠氣缸PRA/182040/M/270              PRA/182040/M/330             PRA/182040/M/200
Norgren諾冠氣缸PRA/182040/280           PRA/182040/M/100              PRA/182040/M/840
Norgren諾冠氣缸PRA/182040/M/95         PRA/182040/M/380              PRA/182040/130
Norgren諾冠氣缸PRA/182040/M/280              PRA/182040/M/260             PRA/182040/M/300
Norgren諾冠氣缸PRA/182040/M/590              PRA/182040/M/125             PRA/182040/M/1000
Norgren諾冠氣缸PRA/182040/M/375              PRA/182040/M/320              PRA/182040/250
Norgren諾冠氣缸PRA/182040/200           PRA/182040/M/30               PRA/182040/M/420
Norgren諾冠氣缸PRA/182040/100           PRA/182040/M/385              PRA/182040/M/215

Norgren諾冠氣缸PRA/182032/M/470/B/G        PRA/182032/M/20        PRA/182032/M/315
Norgren諾冠氣缸PRA/182032/1100          PRA/182032/M/17               PRA/182032/M/500
Norgren諾冠氣缸PRA/182032/N2/160             PRA/182032/M/275       PRA/182032/X2/125
Norgren諾冠氣缸PRA/182032/M/490              PRA/182032/M/435             PRA/182032/X3/160
Norgren諾冠氣缸PRA/182032/M/470              PRA/182032/M/16              PRA/182032/M/585
Norgren諾冠氣缸PRA/182032/MU/10/12/UF/D              PRA/182032/M/540       PRA/182032/15
Norgren諾冠氣缸PRA/182032/40             PRA/182032/25            PRA/182032/JM/50
Norgren諾冠氣缸PRA/182032/10             PRA/182032/80            PRA/182032/M/530
Norgren諾冠氣缸PRA/182032/200           PRA/182032/50            PRA/182032/M/460
Norgren諾冠氣缸PRA/182032/W/50         PRA/182032/MU/10/12        PRA/182032/X2/50
Norgren諾冠氣缸PRA/182032/N2/400      PSA/182032/M/900              PRA/182032/L4/250
Norgren諾冠氣缸PRA/182032/X1/1100     PRA/182032/X3/150/UR+F   PRA/182032/X3/80
Norgren諾冠氣缸PRA/182032/M/640              PRA/182032/M/860             PRA/182032/N2/500

諾冠無桿氣缸
Norgren諾冠氣缸TPRA/182032/M/100     PRA/182032/M/25/F/FH       PRA/182032/M/1080
Norgren諾冠氣缸PRA/182032/M/40/UH/F/S                  PRA/182032/W/50/F/R
Norgren諾冠氣缸PRA/182032/M/400/D/UF                   PRA/182032/M/960/UH
Norgren諾冠氣缸PQA/182032/40             PRA/182040/M/80               PRA/182040/M/160

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