GRLA-1/8-QS-8-RS-B162966節流閥/FESTO單向閥
FESTO節流閥的性能要求是節流閥·流量調節范圍大,流量一壓差變化平滑;·內泄漏量小,若有外泄漏油口,外泄漏量也要小;·調節力矩小,動作靈敏。節流閥的外形結構與截止閥并無區別,只是它們啟閉件的形狀有所不同。節流閥的啟閉件大多為圓錐流線型,通過它改變通道截面積而達到調節流量和壓力。節流閥供在壓力降極大的情況下作降低介質壓力之用。介質在節流閥瓣和閥座之間流速很大,以致使這些零件表面很快損壞-即所謂汽蝕現象。為了盡量減少汽蝕影響,閥瓣采用耐汽蝕材料(合金鋼制造)并制成*角為140~180的流線型圓錐體,這還能使閥瓣能有較大的開啟高度,一般不推薦在小縫隙下節流。節流閥是通過改變節流截面或節流長度以控制流體流量的閥門。將節流閥和單向閥并聯則可組合成單向節流閥。節流閥和單向節流閥是簡易的流量控制閥,在定量泵液壓系統中,節流閥和溢流閥配合,可組成三種節流調速系統,即進油路節流調速系統、回油路節流調速系統和旁路節流調速系統。
FESTO節流閥和止回閥功能的多用閥門。它的結構形式與節流閥相似,但閥桿與閥瓣不是固定聯接。當閥桿下降將閥瓣緊壓在閥座上時,起節流閥作用;閥桿上升后,則起止回閥作用。在同時需要安裝節流閥(或閘閥)和止回閥的管道上(如水泵的出口端),或在安裝位置受到限制的場所(如船舶),使用截止止回閥可節約安裝費用和空間位置。節流閥是使用zui廣泛的一種閥門,它之所以廣受歡迎,是由于開閉過程中密封面之間摩擦力小,比較耐用,開啟高度不大,制造容易,維修方便,不僅適用于中 低壓,而且適用于高壓。節流閥的閉合原理是,依靠閥杠壓力,使閥瓣密封面與閥座密封面緊密貼合,阻止介質流通。 節流閥只許介質單向流動,安裝時有方向性。節流閥的結構 長度大于閘閥,同時流體阻力大,長期運行時,密封可靠性 不強。節流閥屬于強制密封式閥門,所以在閥門關閉時,必須向閥瓣施加壓力,以強制密封面不泄漏。當介質由閥瓣下方進入閥門時,操作力所需要克服的阻力,是閥桿和填料的摩擦力與由介質的壓力所產生的推力,關閥門的力比開閥門的力大,所以閥桿的直徑要大,否則會發生閥桿頂彎的故障。近年來,從自密封的閥門出現后,節流閥的介質流向就改由閥瓣上方進入閥腔,這時在介質壓力作用下,關閥門的力小,而開閥門的力大,閥桿的直徑可以相應地減少。
GRLA-1/8-QS-8-RS-B162966節流閥/FESTO單向閥
2003/10 – Subject to change – Products 2004/2005
2/5.6-1
FESTO節流閥和單向節流閥
FESTO單向節流閥,
用于控制進氣和排氣流量
節流閥,不帶單向功能
適用于螺紋M3...G?和氣管外徑3...12 mm
工程塑料和金屬結構
不含銅和聚四氟乙烯
耐腐蝕結構
性能要求
對FESTO節流閥的性能要求是:
·費斯托流量調節范圍大,流量一壓差變化平滑;
·內泄漏量小,若有外泄漏油口,外泄漏量也要小;
·調節力矩小,動作靈敏。
費斯托節流閥(Choke valve)的外形結構與截止閥并無區別,只是它們啟閉件的形狀有所不同。節流閥的啟閉件大多為圓錐流線型,通過它改變通道截面積而達到調節流量和壓力。節流閥供在壓力降極大的情況下作降低介質壓力之用。
介質在節流閥瓣和閥座之間流速很大,以致使這些零件表面很快損壞-即所謂氣蝕現象。為了盡量減少氣蝕影響,閥瓣采用耐氣蝕材料(合金鋼制造)并制成*角為140~180的流線型圓錐體,這還能使閥瓣能有較大的開啟高度,一般不推薦在小縫隙下節流。
特點
1、構造較簡單,便于制造和維修,成本低。
2、調節精度不高,不能作調節使用。
3、密封面易沖蝕,不能作切斷介質用。
4、密封性較差。
分類
FESTO節流閥按通道方式可分為直通式和角式兩種;按啟閉件的形狀分,有針形、溝形和窗形三種。
可調節節流閥:閥針和閥芯采用硬質合金制造,產品按API6A標準設計,具有耐磨、耐沖刷性能。主要用于井口采油(氣)樹設備,
滑套式節流閥:閥芯采用低噪音平衡型結構,開啟輕便,產品按API6A標準設計,閥芯表面覆蓋碳化鎢,適合于有閃蒸、高壓差,高壓力,空化等條件苛刻的場合,使用壽命長,流量調節精度大大提高。適用于石油,天然氣,化工,煉油,水電等行業。
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WALTHER MD-007-2-WR021-19-2-G1/2
WALTHER LP-007-2-WR017-13-2 G3/8A
WALTHER LP-007-1-S1018-13-2(DN7/PN50M18*1.5)
WALTHER MD-007-0-WR021-13-2(DN7/PN250/G1/2A)
Pister 092.08DD-SO-N24V DIN 1
寶德Burkert 046018
HYDAC EVS3104-A-0300-000
GEFRAN LT-F-0175-S
TR LA66K ART.NR:312-01327
Burkert 227236
Eltra意爾創 ER40B500Z5/28P6X6PR
Eltra意爾創 ERA150S8/24L6P
NORGREN 8026675
WAIRCOM CLR8 MAX.12bar
BAUSER 629A.2
AVENTICS 0821303504
AVENTICS R412004800
AVENTICS 0830100487
AVENTICS 0822123001
AVENTICS 5811110100
RICHTER BVA 150LBS PFA
Burkert 00567223
TR ArtNr:219-00773
HYDAC HDA4745-A-400-000
PULSOTRONIC DLA640-48/10 90867300008
RICKMEIER R35/31.5
Burkert 178354
SCHONBUCH IX050808
VOITH 150031411 80017-011 0-160bar&63G1/4RS
PHOENIX MINI-PS-100-240AC/2X15DC/1
Draeger SENSING HEAD SE EX HT M DD P/26812720
Novotechnik MUP110-1
Mobrey SMN1
TR aev70m-00103