力士樂(lè)REXROTH先導(dǎo)式減壓閥,REXROTH液壓閥現(xiàn)貨,REXROTH鄭州現(xiàn)貨
REXROTH減壓閥是通過(guò)調(diào)節(jié),將進(jìn)口壓力減至某一需要的出口壓力,并依靠介質(zhì)本身的能量,使出口壓力自動(dòng)保持穩(wěn)定的閥門(mén)。從流體力學(xué)的觀點(diǎn)看,REXROTH減壓閥是一個(gè)局部阻力可以變化的節(jié)流元件,即通過(guò)改變節(jié)流面積,使流速及流體的動(dòng)能改變,造成不同的壓力損失,從而達(dá)到減壓的目的。然后依靠控制與調(diào)節(jié)系統(tǒng)的調(diào)節(jié),使閥后壓力的波動(dòng)與彈簧力相平衡,使閥后壓力在一定的誤差范圍內(nèi)保持恒定。
REXROTH止回閥用途廣泛,有很多種類,下面說(shuō)的是供水和熱力常用的止回閥:
1、彈簧式:液體由下而上,依靠壓力頂起彈簧控制的閥瓣,壓力消失后,彈簧力將閥瓣壓下,封閉液體倒流。常用于通徑較小的止回閥。
2、重力式:和彈簧式相似,依靠閥瓣的自身重力封閉,防止倒流。
3、旋啟式:液體在閥體內(nèi)直通,依靠壓力頂開(kāi)一側(cè)的旋轉(zhuǎn)閥瓣,壓力失去后,閥瓣依靠自重回位,反向的液體壓力封閉閥瓣。
4.塑料隔膜式: 外殼和隔膜均為塑料.一般外殼為ABS,PE,PP,NYLON, PC.隔膜有硅樹(shù)脂,氟樹(shù)脂等.
其它的單向閥(止回閥),如排污的止回閥,人防的防爆閥和液體使用的止回閥的原理是大同小異。
德國(guó)REXROTH液壓閥貨號(hào)、型號(hào):
R900968833 4WS2EM6-2X/10B12ET315K17EV力士樂(lè)Rexroth
R900968259 4WS2EM10-5X/60B11ET315K31AV
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R900965624 4WS2EE10-4X/45B2T210K8DV
R900965141 4WS2EM10-4X/75B2T315K8DV
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R900964903 4WS2EM10-4X/75B3T315K8CV
R900964149 4WS2EB10-4X/60B2ET70K8DM
R900963401 4WS2EM10-4X/20B3T315K8DV-24力士樂(lè)Rexroth
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R900960971 4WS2EM10-4X/30B2T315K8EV
R900960652 4WS2EM16-2X/150B12T315K8CV-104力士樂(lè)Rexroth
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R900960575 4WS2EM16-2X/200B12ET315K8EV
R900960539 4WS2EB10-4X/45B2ET40K8AV力士樂(lè)Rexroth
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R900958815 4WS2EM10-4X/30B1ET315K8BV力士樂(lè)Rexroth
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R900950929 4WS2EM6-2X/2B11ET315K17EV
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力士樂(lè)REXROTH先導(dǎo)式減壓閥,REXROTH液壓閥現(xiàn)貨,REXROTH鄭州現(xiàn)貨