定壓溢流作用:在定量泵節(jié)流調(diào)節(jié)系統(tǒng)中,定量泵提供的是恒定流量。當(dāng)系統(tǒng)壓力增大時(shí),會(huì)使流量需求減小。此時(shí)溢流閥開啟,使多余流量溢回油箱,保證溢流閥進(jìn)口壓力,即泵出口壓力恒定(閥口常隨壓力波動(dòng)開啟)。
系統(tǒng)卸荷作用:在溢流閥的遙控口串接溢小流量的電磁閥,當(dāng)電磁鐵通電時(shí),溢流閥的遙控口通油箱,此時(shí)液壓泵卸荷。溢流閥此時(shí)作為卸荷閥使用。
安全保護(hù)作用:系統(tǒng)正常工作時(shí),閥門關(guān)閉。只有負(fù)載超過規(guī)定的極限(系統(tǒng)壓力超過調(diào)定壓力)時(shí)開啟溢流,進(jìn)行過載保護(hù),使系統(tǒng)壓力不再增加(通常使溢流閥的調(diào)定壓力比系統(tǒng)最高工作壓力高10%~20%)。
實(shí)際應(yīng)用中一般有:作卸荷閥用,作遠(yuǎn)程調(diào)壓閥,作高低壓多級(jí)控制閥,作順序閥,用于產(chǎn)生背壓(串在回油路上)。
液壓裝置中容易產(chǎn)生噪聲的元件一般認(rèn)為是泵和閥,閥中又以溢流閥和電磁換向閥等為主。產(chǎn)生噪聲的因素很多。溢流閥的噪聲有流速聲和機(jī)械聲二種。流速聲中主要由油液振動(dòng)、空穴以及液壓沖擊等原因產(chǎn)生的噪聲。機(jī)械聲中主要由閥中零件的撞擊和磨擦等原因產(chǎn)生的噪聲。
先導(dǎo)型溢流閥的導(dǎo)閥部分是一個(gè)易振部位如圖3所示。在高壓情況下溢流時(shí),導(dǎo)閥的軸向開口很小,僅0.003~0.006厘米。過流面積很小,流速很高,可達(dá)200米/秒,易引起壓力分布不均勻,使錐閥徑向力不平衡而產(chǎn)生振動(dòng)。另外錐閥和錐閥座加工時(shí)產(chǎn)生的橢圓度、導(dǎo)閥口的臟物粘住及調(diào)壓彈簧變形等,也會(huì)引起錐閥的振動(dòng)。所以一般認(rèn)為導(dǎo)閥是發(fā)生噪聲的振源部位。
由于有彈性元件(彈簧)和運(yùn)動(dòng)質(zhì)量(錐閥)的存在,構(gòu)成了一個(gè)產(chǎn)生振蕩的條件,而導(dǎo)閥前腔又起了一個(gè)共振腔的作用,所以錐閥發(fā)生振動(dòng)后易引起整個(gè)閥的共振而發(fā)出噪聲,發(fā)生噪聲時(shí)一般多伴隨有劇烈的壓力跳動(dòng)。
當(dāng)由于各種原因,空氣被吸入油液中,或者在油液壓力低于大氣壓時(shí),溶解在油液中的部分空氣就會(huì)析出形成氣泡,這些氣泡在低壓區(qū)時(shí)體積較大,當(dāng)隨油液流到高壓區(qū)時(shí),受到壓縮,體積突然變小或氣泡消失;反之,如在高壓區(qū)時(shí)體積本來(lái)較小,而當(dāng)流到低壓區(qū)時(shí),體積突然增大,油中氣泡體積這種急速改變的現(xiàn)象。氣泡體積的突然改變會(huì)產(chǎn)生噪聲,又由于這一過程發(fā)生在瞬間,將引起局部液壓沖擊而產(chǎn)生振動(dòng)。先導(dǎo)式溢流閥的導(dǎo)閥口和主閥口,油液流速和壓力的變化很大,很容易出現(xiàn)空穴現(xiàn)象,由此而產(chǎn)生噪聲和振動(dòng)。
先導(dǎo)式溢流閥在卸荷時(shí),會(huì)因液壓回路的壓力急驟下降而發(fā)生壓力沖擊噪聲。愈是高壓大容量的工作條件,這種沖擊噪聲愈大,這是由于溢流閥的卸荷時(shí)間很短而產(chǎn)生液壓沖擊所致在卸荷時(shí),由于油流速急劇變化,引起壓力突變,造成壓力波的沖擊。壓力波是一個(gè)小的沖擊波,本身產(chǎn)生的噪聲很小,但隨油液傳到系統(tǒng)中,如果同任何一個(gè)機(jī)械零件發(fā)生共振,就可能加大振動(dòng)和增強(qiáng)噪聲。所以在發(fā)生液壓沖擊噪聲時(shí),一般多伴有系統(tǒng)振 動(dòng)。
在先導(dǎo)型溢流閥發(fā)出的噪聲中,有時(shí)會(huì)有機(jī)械性的高頻振動(dòng)聲,一般稱它為自激振動(dòng)聲。這是主閥和導(dǎo)閥因高頻振動(dòng)而發(fā)生的聲音。它的發(fā)生率與回油管道的配置、流量、壓力、油溫(粘度)等因素有關(guān)。一般情況下,管道口徑小、流量少、壓力高、油液粘度低,自激振動(dòng)發(fā)生率就高。
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力士樂液壓元件: 柱塞泵A10VSO、電磁閥4WE、溢流閥DBW、節(jié)流閥Z2S、Z2F、葉片泵PV7、齒輪泵PH2,PH4,PGF、壓力繼電器HED、博世放大器 閥0811、0820 、齒輪泵0510、減壓閥DR、ZDR、4WREE、4WRPE等系列特價(jià)現(xiàn)貨優(yōu)勢(shì)供應(yīng)
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力士樂比例閥,比例流量閥 液壓閥
帶位置反饋的先導(dǎo)式比例方向閥有10通徑和35通徑兩種規(guī)格,高工作壓力350 bar,大流量3000 L/min.
特點(diǎn):
先導(dǎo)控制二級(jí)比例方向閥;閥用于控制液流的方向和大??;
通過比例電磁鐵控制;
使用電位置反饋;
主閥芯彈簧對(duì)中;
先導(dǎo)控制為單級(jí)比例方向閥;
內(nèi)置放大器。
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Rexroth品牌,比例閥,4WRZ25W8-325-7X/6EG24N9ETK4/D3M
Rexroth品牌,比例閥,4WRZE10E85-71/6EG24N9ETK31/A1D3M
Rexroth品牌,比例換向閥,4WRZ10W8-85-7X/6EG24N9EK4/D3M
Rexroth品牌,比例換向閥,4WRZ25W8/220-71/6EG24N9K4/M
Rexroth品牌,比例換向閥,4WRZ25W8/220-71/6EG24N9K4/M
08114047574WRPEH10C5B100L-2X/G24K0/A1M
R9012444104WRPEH6CB02L-2X/G24K0/A1M
08114047414WRPEH6CB04L-2X/G24K0/A1M
R9011254514WRPEH6CB04L-2X/G24K0/F1M
R9011292274WRPEH6CB04L-2X/G24K0/F1V
08114045274WRPEH6CB12L-2X/G24K0/A1M
08114043554WRPEH6CB24L-2X/G24K0/A1M
08114047434WRPEH6CB24L-2X/G24K0/B5M
08114043594WRPEH6CB25P-2X/G24K0/A1M
08114043634WRPEH6CB25P-2X/G24K0/A1M-303
08114046394WRPEH6CB40L-2X/G24K0/A1M
08114046404WRPEH6CB40L-2X/G24K0/F1M
R9013038464WRPEH6C1B24L-2X/G24K0/A1M
08114047384WRPEH6C1B40L-2X/G24K0/A1M
08114047444WRPEH6C3B02L-2X/G24K0/A1M
8114045264WRPEH6C3B02L-2X/G24K0/F1M
08114046004WRPEH6C3B04L-2X/G24K0/A1M
08114046074WRPEH6C3B04L-2X/G24K0/A1M-816
08114046254WRPEH6C3B04L-2X/G24K0/A1M-841
08114046214WRPEH6C3B04L-2X/G24K0/B5M
08114046314WRPEH6C3B04L-2X/G24K0/F1M
08114046054WRPEH6C3B04P-2X/G24K0/A1M
08114046244WRPEH6C3B08L-2X/G24K0/A1M-841
08114046014WRPEH6C3B12L-2X/G24K0/A1M
08114046084WRPEH6C3B12L-2X/G24K0/A1M-816
08114046424WRPEH6C3B15P-2X/G24K0/A1M
4WRL16V200M-3X/G24Z4/M(0811404207)
4WREE6W16-2X/G24K31/A1V(R900925657)
4WREE10W75-2X/G24K31/A1V(R900927233)
AA10VSO45DFR1/31R-PPA12N00(R910908725)
PGH5-3X/125RE11VU2(R901147118)
H-4WMM16J7X/F(R900927809)
Z2FS16-8-3X/S2(R900457256)
Z2FS22-8-3X/S2(R900443176)
AZPF-11-008RCB20MB(0510425009)
AZPF-11-011RCB20MB(0510525009)
SCA16BZ2X/M(R900425666)
ZDC16P-2X/M(R900489668)
ZDC25P-2X/M(R900344369)
4WRPEH6C3B40L-2X/G24K0/F1M(0811404634)
4WRPEH6C4B40L-2X/G24K0/F1M(0811404353)
AA4VSO71DR/10R-PPB13N00
08114041704WRPH6C3B40L-2X/G24K0/M-750
08114040364WRPH6C3B40L-2X/G24Z4/M
0811404044 4WRPH6C3B40P-2X/G24Z4/M
0811404160 4WRPH6C4B04L-2X/G24Z4/M
0811404112 4WRPH6C4B12L-1X/G24Z4/M
0811404037 4WRPH6C4B12L-2X/G24Z4/M
0811404048 4WRPH6C4B15P-2X/G24Z4/M
0811404118 4WRPH6C4B24L-1X/G24Z4/M
0811404167 4WRPH6C4B24L-2X/G24K0/M-750
0811404038 4WRPH6C4B24L-2X/G24Z4/M
0811404045 4WRPH6C4B25P-2X/G24Z4/M
0811404171 4WRPH6C4B40L-2X/G24K0/M-750
0811A04039 4WRPH6C4B40L-2X/G24Z4/M
0811404039 4WRPH6C4B40L-2X/G24Z4/M
0811404046 4WRPH6C4B40P-2X/G24Z4/M
0811404177 4WRPH6XB12L-2X/G24K0/M-843
0811404166 4WRPH6XB12L-2X/G24Z4/M-842
0811404163 4WRPH6XB24L-2X/G24Z4/M-842
0811404175 4WRPH6XB40L-2X/G24Z4/M-842
R901228303 4WRPNH10C1B100L-2X/M/24PA6B
R901224752 4WRPNH10C1B100L-2X/M/24PF6G
0811403361 4WRPNH10C3B100L-2X/M/24CA6A
R901237536 4WRPNH10C3B100L-2X/M/24FA6B
0811403364 4WRPNH10C3B100L-2X/M/24PA6A
AA4VSO125DR/30R-PPB13N00
AA4VSO180DR/30R-PPB13N00
AA4VSO250DR/30R-PPB13N00
AA10VSO45DR/31R-PPA12N00
AA10VSO71DR/31R-PPA12N00
AA10VSO100DR/31R-PPA12N00
AA10VSO140DR/31R-PPB12N00
AA10VSO71DRS/32R-VPB22U99
AA10VSO100DRS/32R-VPB12N00
AA10VSO140DRS/32R-VPB12N00
R900052392,M-3SED6CK1X/350CG24N9K4
R900052621,M-3SED6UK1X/350CG24N9K4
R900566273,M-3SEW6C3X/420MG24N9K4
R900566283,M-3SEW6U3X/420MG24N9K4
M-3SED10UK1X/350CG24N9K4(R900051053)
M-3SED10CK1X/350CG24N9K4(R900086685)
4WREE6V1-32-2X/G24K31/A1V(R900914841)
4WREE6E08-2X/G24K31/A1V-655(R900950341)
4WREE6E16-2X/G24K31/A1V-655(R900950342)
4WREE6E32-2X/G24K31/A1V-655(R900962181)
4WRAE6E30-2X/G24K31/A1V(R900954071)
0811404613
4WRPEH 6 C3 B40L-2X/G24K0/F1M,力士樂比例閥
4WRZE16W8-100-7X/6EG24N9ETK31/F1D3M
4WRZE16W8-150-7X/6EG24N9ETK31/F1D3M
4WREE10W150-2X/G24K31/F1V
MTS-P01.2-D2-P1-NN-NN-NN-FWEP
4WS2EM10-5X/75B11ET315K31EV
4WRKE10W6-100L-3X/6EG24K31/F1D3M
4WRKE16W8-200L-31/6EG24ETK31/A1D3M
3DREM16 P-6X/100YG24K4V
R911249088 TDM7.1-015-300-WO/S102
4WRZE25W6-325-70/6EG24N9ETK31/A1D3M
4WRKE16W6–200L-3X/6EG24K31/A5D3M
R9007348464WRTE10E100P-4X/6EG24ETK31/A5M
VT-HNC100-4-30/P-I-00/G04
R911261314MKD071B-061-GP0-KN
TVD1.2-15-03
R9009546814WRZE25W6-325-7X/6EG24ETK31/A1D3M
4WREE6E1-32-2X/G24K31/A1V
4WREE6V04-22/G24K31/F1V
0811404611
08114041224WRPH 6 C3 B04L-1X/G24Z4/M
08114041114WRPH 6 C3 B12L-1X/G24Z4/M
08114040344WRPH 6 C3 B12L-2X/G24Z4/M
08114041064WRPH 6 C3 B24L-1X/G24Z4/M
08114040354WRPH 6 C3 B24L-2X/G24Z4/M
08114041134WRPH 6 C3 B40L-1X/G24Z4/M
08114040364WRPH 6 C3 B40L-2X/G24Z4/M
08114041604WRPH 6 C4 B04L-2X/G24Z4/M
08114041124WRPH 6 C4 B12L-1X/G24Z4/M
08114040374WRPH 6 C4 B12L-2X/G24Z4/M
08114040384WRPH 6 C4 B24L-2X/G24Z4/M
08114040394WRPH 6 C4 B40L-2X/G24Z4/M
R9011254514WRPEH 6 C B04L-2X/G24K0/F1M
08114046404WRPEH 6 C B40L-2X/G24K0/F1M
08114046314WRPEH 6 C3 B04L-2X/G24K0/F1M
08114046334WRPEH 6 C3 B24L-2X/G24K0/F1M
08114046344WRPEH 6 C3 B40L-2X/G24K0/F1M
08114043504WRPEH 6 C4 B04L-2X/G24K0/F1M
08114043514WRPEH 6 C4 B12L-2X/G24K0/F1M
08114043524WRPEH 6 C4 B24L-2X/G24K0/F1M
08114043534WRPEH 6 C4 B40L-2X/G24K0/F1M
R9009272304WREE10E752X/G24K31/A1V
R9009071144WREE6E32-2X/G24K31/A1V
R9009503414WREE6E082X/G24K31/A1V-655
R9009503424WREE6E162X/G24K31/A1V655
R9005583564WRAE10E60-2X/G24N9K31/A1V
R9007105304WRAE10W60-2X/G24K31/F1V
R9009540834WRAE10E60-2X/G24K31/A1V
4WRPEH 6 C3 B40L-2X/G24K0/F1M,力士樂比例閥
4WRPEH 6 C3 B40L-2X/G24K0/F1M,力士樂比例閥