DBETE-61/315G24K31A1V比例溢流閥 德國博世力士樂REXROTH比例閥 比例溢流閥 ****現(xiàn)貨

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DBETE-61/315G24K31A1V比例溢流閥

溢流閥的功用

先導(dǎo)閥和主閥閥芯分別處于受力平衡，其閥口都滿足壓力流量方程。閥的進(jìn)口壓力由兩次比較得到，壓力值主要由先導(dǎo)閥調(diào)壓彈簧的預(yù)壓縮量確定，主閥彈簀起復(fù)位作用。

通過先導(dǎo)閥的流量很小，是主閥額定流量的1%因此其尺寸很小，即使是高壓閥，其彈簧剛度也不大。這樣一來閥的調(diào)節(jié)性能有很大改善。

主閥芯開啟是利用液流流經(jīng)阻力孔形成的壓力差。阻力孔一般為細(xì)長孔，孔徑很小0=0.8~1.2mm,孔長I = 8~12mm,因此工作時易堵塞，一旦堵塞則導(dǎo)致主閥口常開無法調(diào)壓。

比例溢流閥的壓力控制閥

比例溢流閥的特點是調(diào)定的壓力與輸入電流大小成正比，即輸入的電流大，調(diào)定的壓力高。

當(dāng)通過計算機鍵盤輸入被折板料的抗拉強度，厚度，長度以及下模V型槽開口寬度后，計算機按折彎力計算公式求得所需折彎力，經(jīng)數(shù)模轉(zhuǎn)換后，通過控制比例溢流閥的電控器，向比例溢流閥輸入適當(dāng)?shù)碾娏髦�，從而達(dá)到控制折彎力大小的目的。板料折彎機所需小折彎力和允許的大折彎力要與比例溢流閥的壓力特征曲線相對應(yīng)，并且使調(diào)定的壓力稍大于所需折彎力，以利于板料的順利折彎。

比例溢流閥的壓力控制一般為開環(huán)，如接入壓力傳感器，可進(jìn)行閉環(huán)控制。

DBETE--61/315G24K31A1V比例溢流閥

液壓比例控制系統(tǒng)

以比例控制元件完成動力與運動方向控制，分為比例壓力閥、比例流量閥、比例方向閥及比例方向流量閥，可為模擬量輸入或數(shù)字量輸入，視是否帶反饋分為開環(huán)控制與閉環(huán)控制，一般獲得頻率不是很高(10HZ)以內(nèi)，高頻響閥可實現(xiàn)較高頻率。

若精度要求不高可考慮使用電液比例控制系統(tǒng)，一般電液比例控制系統(tǒng)可達(dá)至以下精度

位置精度- 3 mm

速度精度帶壓力補償器- 3%

加減速斜坡時間-0.5秒

壓力帶位移傳感器的產(chǎn)品-比例壓力閥設(shè)定的0.3% (如壓力設(shè)定為200bar,精度可達(dá)0.6bar)

一般的多驅(qū)動器液壓系統(tǒng)皆要求流量及壓力控制，提供比例壓力及流量控制系統(tǒng)

開環(huán)式比例壓力及流量控制可用于定量泵及變量泵系統(tǒng)。

速度和流量比例控制的分別是:

流量控制只控制供油量,并不控制驅(qū)動元件的運動方向;

若系統(tǒng)負(fù)載及變速要求高，則要使用速度控制系統(tǒng)。

速度比例控制多用于自動化控制、注塑機、壓力機等

DBETE-61/315G24K31A1V比例溢流閥型號

力士樂REXROTH比例溢流閥

力士樂REXROTH比例溢流閥，直動式

力士樂REXROTH壓力控制比例溢流閥，直動式、帶集成式電子放大版（OBE）DBETA

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力士樂REXROTH比例壓力溢流閥，直動式，不帶集成電子（OBE）DBET

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力士樂REXROTH比例減壓閥，直接操作

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力士樂REXROTH減壓閥，直接操作，直流電動機操作DBGT

減壓閥的出口壓力是用來控制電液換向閥或外控順序閥等的控制油液壓力大小的，當(dāng)電液換向閥或外控順序閥換向或工作后，減壓閥出油口流量變?yōu)榱悖�但壓力還需保持原先調(diào)定的壓力。這種情況下，因閥出口流量為零，流經(jīng)減壓口的流量只有先導(dǎo)流量。由于先導(dǎo)流量很少，一般在2L/min之內(nèi)，因此主閥減壓口基本上接近全關(guān)位置（開度極小），先導(dǎo)流量由三角槽或斜錐面處流出，如果主閥芯配合過松或磨損過大，則泄漏量增加。