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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(guān)動作,閥芯位置不需電來保持。它的優(yōu)點在于節(jié)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(jié)構(gòu)zui為簡單。它是以改變直流電源極性改變對應(yīng)閥門開關(guān)的兩種狀態(tài)。這種電磁閥單獨安裝線圈外部接線需加轉(zhuǎn)換開關(guān)，而與智能儀表配套則十分方便。IC卡預(yù)收費煤氣表和水表所配的電磁閥是儀表成敗的關(guān)鍵之一，其中的自保持技術(shù)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(huán)，磁力線通過薄壁缸筒與套在外面的另一組磁環(huán)作用，由于兩組磁環(huán)磁性相反，具有很強的吸力。當(dāng)活塞在缸筒內(nèi)被氣壓推動時，則在磁力作用下，帶動缸筒外的磁環(huán)套一起移動。氣缸活塞的推力必須與磁環(huán)的吸力相適應(yīng)。

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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