諾冠圓筒氣缸順便指出國(guó)內(nèi)油庫(kù)大流量的計(jì)量還在引進(jìn)或仿造國(guó)外的結(jié)構(gòu)較復(fù)雜、性能欠穩(wěn)定的多段關(guān)閉閥，這種產(chǎn)品并非世界著名的專業(yè)公司所制，因?yàn)槭袌?chǎng)需求量沒(méi)達(dá)到足以引以他們的興趣。實(shí)際上我們的油庫(kù)采用國(guó)內(nèi)生產(chǎn)的大流量的雙聯(lián)組合閥，效果會(huì)好得多。雙聯(lián)組合閥還常用來(lái)控制溫度、壓力、液位等參數(shù)。大閥保證基礎(chǔ)量，小閥提供補(bǔ)償量。在參數(shù)相對(duì)穩(wěn)定的系統(tǒng)中，這種位式控制能達(dá)相當(dāng)高精度。好些參數(shù)變化較大的系統(tǒng)，變化的速率仍受一定制約，例如溫度控制系統(tǒng)，仍受熱慣性的影響。所以運(yùn)用得當(dāng)?shù)碾p聯(lián)組合閥在滿足控制要求的前提下相對(duì)于調(diào)節(jié)閥能大幅降低成本。

   諾冠圓筒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(dòng)作,閥芯位置不需電來(lái)保持。它的優(yōu)點(diǎn)在于節(jié)約能源尤其是用電池作電源的場(chǎng)合，而且可不考慮溫升，從而線圈壽命長(zhǎng)，在高低溫、防爆等場(chǎng)合有較高安全性。常見的有機(jī)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(jiǎn)單。它是以改變直流電源極性改變對(duì)應(yīng)閥門開關(guān)的兩種狀態(tài)。這種電磁閥單獨(dú)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(fèi)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，國(guó)內(nèi)的自保持電磁已日趨成熟

Norgren諾冠氣缸PRA/182040/M/760              PRA/182040/M/1160            PRA/182040/M/60
Norgren諾冠氣缸PRA/182040/M/460              PRA/182040/320                 PRA/182040/M/165

Norgren諾冠氣缸PRA/182040/M/485              PRA/182040/M/520             PRA/182040/M/630

Norgren諾冠氣缸PRA/182040/M/85         PRA/182040/380                  PRA/182040/260
Norgren諾冠氣缸PCA/182040/M/25         PRA/182040/L4/350             PRA/182040/M/660
Norgren諾冠氣缸PRA/182040/M/50/F/D2        PRA/182040/M/180       PRA/182040/JM/250
Norgren諾冠氣缸PRA/182040/M/680              PRA/182040/L4/900            PRA/182040/M/120
Norgren諾冠氣缸PRA/182040/360           PRA/182040/60                   PRA/182040/X2/160
Norgren諾冠氣缸PRA/182040/L4/500              PRA/182040/M/140             PRA/182040/M/500
Norgren諾冠氣缸PRA/182040/M/15         PRA/182040/160                  PRA/182040/300
Norgren諾冠氣缸TPRA/182040/M/50              PRA/182040/30                  PRA/182040/230
Norgren諾冠氣缸PRA/182040/106           PRA/182040/JM/70              PRA/182040/L4/125
Norgren諾冠氣缸PRA/182040/M/35         PRA/182040/L4/380             PRA/182040/80
Norgren諾冠氣缸 

PRA/182040/M/700              PRA/182040/M/530             PRA/182040/M/370
Norgren諾冠氣缸PRA/182040/M/390              PRA/182040/M/360              PRA/182040/M/70
Norgren諾冠氣缸PRA/182040/M/430              PRA/182040/M/545             PRA/182040/M/290
Norgren諾冠氣缸PRA/182040/N1/80        PRA/182040/M/240              PRA/182040/M/230
Norgren諾冠氣缸PRA/182040/M/440              PRA/182040/M/480             PRA/182040/M/175
Norgren諾冠氣缸PRA/182040/M/470              PRA/182040/M/490             PRA/182040/M/275
Norgren諾冠氣缸PRA/182040/M/410              PRA/182040/M/425              PRA/182040/M/40
Norgren諾冠氣缸PRA/182040/JM/340             PRA/182040/25            PRA/182040/M/735
Norgren諾冠氣缸PRA/182040/M/45         PRA/182040/M/220              PRA/182040/L4/150
Norgren諾冠氣缸PRA/182040/M/25         PRA/182040/M/620              PRA/182040/M/150