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比例阀对流量的控制可以分为两种：
一种是开关控制：要么全开、要么全关，流量要么大、要么小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。
另一种是连续控制：阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。
所以使用比例阀或伺服阀的目的就是：以电控方式实现对流量的节流控制（当然经过结构上的改动也可实现压力控制等），既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
武汉盛美特机电设备有限公司
其中主要经营如下：
经营产品：
阀类：电磁阀、换向阀、单向阀、溢流阀、减压阀、平衡阀、插装阀、比例阀等
泵类：齿轮泵、柱塞泵、叶片泵等
电子元器件：放大器、压力继电器、压力传感器等
Parker优势型号:
D41FHB31C1NE00
D41FHB31E1NB00
D41FHE01C1NB00
D41FHE01C1NE00
D41FHE01E1NB00
D41FHE01E1NE00
D41FHE01F1NE00
D41FHE01F4NB00
D31FBE01CC4NF00
D31FHE01A4NB00
D3FXE01HCNBJ00
D91FBE01HC1NF00
D41FHB31C1NB00
D41FHB31E1NE00
D41FHB31F1NB00
D41FHB31F1NE00
D91FBE01HC1NG00
D91FHB31F1NE00
D31FBE01CC1NF00
D31FBE01CC1NG00
D41FBE01FC1NF00
D41FBE01FC1NG00
D41FBE01FC4NF00
D41FBE02FC1NF00
D91FBB32HC4NG00
D91FBE01HC4NF00
D111FBB32LC1NG00
D111FHE01L4NB00
派克比例阀D91FHE02HC1NB00
派克直动溢流阀VSA315A062
派克液控单向阀CRH3V
派克比例阀D91FTB32HC4VGO
派克换向阀D1VW004CNJWG82XB990
派克换向阀D3W4CNJW32XB990
派克换向阀D1VW4CNJCF56
派克节流阀FM2DDDSN55
派克节流阀FN2DDDSN/CHDKC
派克节流阀D31VW004C4NJW91
派克泵PD140PS02SRS5AC00S1000000
派克溢流阀R25M35K4SN(新型号R4V06-53510A120)
派克换向阀D81VW004C1NTW3A
派克调速阀FM6DDKV
派克液控单向阀CP0M6DDN
派克液控单向阀CP0M4DDHTV
派克换向阀D41VW001C1NTW3A
派克换向阀D41VW020B1NTW3A
派克换向阀D41VW004C1NTW3A
派克调速阀FM4DDFVHT
派克换向阀D3W020BNTW
派克调速阀FM3DDSV
派克溢流阀EVSA064A101
D41FTB32FC1NF00+5004072
D1VW4CNJW+5001571+5001572
D41FTB32FC1NF00
D1VW4CNJW+5001571
D3FTE02MCNF00
D1FTE02FCNF00+5004072
D41VW3C1NJW89+5001571+5001572
D1VW1CNJW+5001571
D41FTB32FC1VF00
D1VW20HNJW+5001571
D1VW1KNJW+5001571
D3FTB32MCNF00
D91FTB32HC1NF00
D81VW3C1NJW89+5001571+5001572
D41VW020B4NJW89
D41FBB32FC1NF00
D1VW004CNJW
D1VW004CNJW
D3FBE02MC0NF00
D1FBE02FC0NF00
D41VW003C1NJW
D1VW001CNJW
D41FBB32FC1VF00
D1VW020HNJW
D1VW001KNJW
D3FBB32MC0NF00
D91FBB32HC1NF0010
D81VW003C1NJW
D41VW020B4NJW
PARKER派克高压柱塞泵(20ml/rev)PV020R1K1T1NMMC
PARKER派克比例柱塞泵 (170ml/rev)PV180R9K1AYNUPM
PARKER派克比例柱塞泵放大卡PQDXXA-Z00
PARKER派克预压阀PVAPVV41N（型号是PVAPVV41N20？）
PARKER派克比例柱塞泵 (270ml/rev)PV270R1K1T1NUPM
PARKER派克比例柱塞泵 (210ml/rev)PV270R9K1T1NUPM
PARKER派克高压柱塞泵(46ml/rev)PV046R1K1T1NMMC
PARKER派克柱塞泵(80ml/rev)PV080R1K1AYNFRC
PARKER派克电磁球阀D1SE83BNJW
PARKER派克电磁球阀D1SE30BNJW
PARKER派克电磁换向阀D1VW004CNJW
PARKER派克电磁换向阀D1VW001ENJW
PARKER派克电磁换向阀D1VW020BNJW
PARKER派克电磁换向阀D3W002ENJW
PARKER派克电磁换向阀D3W004CNJW
PARKER派克电磁换向阀D3W020BNJW
PARKER派克电磁换向阀D3W020HNJW
PARKER派克电磁换向阀D3W026BNJW
PARKER派克电磁换向阀D41VW004C4NJW
PARKER派克电液换向阀D41VW002F2NJW
PARKER派克电液换向阀D41VW020B2NJW
PARKER派克电液换向阀D91VW004C4NJW
PARKER派克电液换向阀D41VW004C4NJW
PARKER派克电液换向阀D91VW015C4NJW
PARKER派克双筒滤器DF2035210QVT1HD651
PARKER派克插入式阻尼节流塞(0.15)DK-D1VW9115
PARKER派克NG 6换向阀电磁线圈AK-D1VWCJW91
PARKER派克NG 10换向阀电磁线圈AK-D3WCJWT30
PGP517A0330CD1H3NL3L2B1B1
PV016R1K1T1NMMC
PV028R1K1JHNMMC
PV028R1L1T1NMMC
PV032R1K1T1NMMC
PV046R1K1T1NMMC
PV046R1L1T1NMMC
PV080R1K1T1NMMC
PV092R1K1T1NMMC
PV140R1K1T1NMR1
PV180R1K1T1NMMC
SSRB080E06
5004072
美国Parker派克比例阀&&派克Parker电磁阀&&派克Parker伺服阀%%派克Parker柱塞泵%%派克PARKER溢流阀
BD15AAABN10
D1FVE02BCVFOA37
TE0330CW260AAAB
BD15AAANB10
PV046R1K1T1NMRD
D41FTE01FC2NF0038
TE0330CW260AAAB
PCD00A-400
PV140R1K1T1NFR1
RE10R25W4SN1XWM
D111VW001C2NYWD111VW001C2NYW91
D111VW001C4NJW3AD111VW001C4NJW3A91
D111VW002C2NJW3AD111VW002C2NJW3A91
D111VW002C2NTW3AD111VW002C2NTW3A91
D111VW009K2NJWD111VW009K2NJW91
D111VW038C2NJWT3BD111VW038C2NJWT3B91
D111VW054C1NJWD111VW054C1NJW91
D111VW054C5NJWD111VW054C5NJW91
D111VW1C1NJPD111VW1C1NJP
D111VW1C2NJPD111VW1C2NJP
D111VW1C4NJPD111VW1C4NJP
D111VW1C4NJWD111VW1C4NJW
D111VW1C4NJW7D111VW1C4NJW7
D111VW1C4VJWD111VW1C4VJW
D111VW1C5NJW55D111VW1C5NJW55
D111VW1E2NJWD111VW1E2NJW
D111VW1E2NJW7D111VW1E2NJW7
D111VW1K2NJW66D111VW1K2NJW66
D111VW20B2NJWD111VW20B2NJW
D111VW20B4NJWD111VW20B4NJW
D111VW20H2NJW60D111VW20H2NJW60
D111VW2C5NJWD111VW2C5NJW
D111VW30B2NJW60D111VW30B2NJW60
D111VW30H2NJWD111VW30H2NJW
D111VW54C1NJPD111VW54C1NJP
D111VW54C1NJWD111VW54C1NJW
D111VW54C1NJW27D111VW54C1NJW27
D111VW54C2NJP7D111VW54C2NJP7
D111VW54C4NJC5D111VW54C4NJC5
D111VW54C4NJP7D111VW54C4NJP7
D111VW54C4NJWD111VW54C4NJW
D111VW54C4VJWD111VW54C4VJW
D111VW54M5NJWD111VW54M5NJW
D111VW58C1NJPD111VW58C1NJP
D111VW82C1NJWD111VW82C1NJW
D111VW82C4NJWD111VW82C4NJW
D111VW9C2NJPD111VW9C2NJP
D111VW9C2NJW7D111VW9C2NJW7
D111VW009F2NJWD111VW009F2NJW
D119V1C2N70D119V1C2N70
D119V1C4ND119V1C4N70
D119V81C4ND119V81C4N70
D119V82C4ND119V82C4N70
D11P1C2ND11P1C2N60
D11P1K2N66D11P1K2N6662
D11P30B2ND11P30B2N60
D11P39C2ND11P39C2N60
D11P81C2ND11P81C2N60
D11P82C2ND11P82C2N60
D31DA1C4ND31DA1C4N70
D31DW001C1NUWD31DW001C1NUW91
D31DW001C1VTWD31DW001C1VTW91
D31DW001C2NJWTI6ND31DW001C2NJWTI6N91
D31DW001C4NGWD31DW001C4NGW91
D31DW001C4NJDLJ5D31DW001C4NJDLJ591
D31DW001C4NJGLMJ7WD31DW001C4NJGLMJ7W82
D31DW001C4NJGLMJ7YD31DW001C4NJGLMJ7Y82
D31DW001C4NJWC060699D31DW001C4NJW91C060699
D31DW001C4NUWI3ND31DW001C4NUWI3N91
D31DW001C4NYWD31DW001C4NYW91
D31DW001F2NJWD31DW001F2NJW91
D31DW001F4NTWD31DW001F4NTW91
D31DW001K2NJWI4ND31DW001K2NJWI4N91
D31DW003C2NJWD31DW003C2NJW91
D31DW003C4VJWD31DW003C4VJW91
D31DW004C2NJWD31DW004C2NJW91
D31DW004C2NJW3AD31DW004C2NJW3A91
D31DW004C2NJW3BD31DW004C2NJW3B91
D31DW004C4NJDLJ5D31DW004C4NJDLJ591
D31DW004C4NKWD31DW004C4NKW91
D31DW004C4NYWD31DW004C4NYW91
D31DW006S4NJWD31DW006S4NJW91
D31DW007C2NJWD31DW007C2NJW91
D31DW008C5NJWD31DW008C5NJW91
D31DW011C4NJDLJ3GD31DW011C4NJDLJ3G91
D31DW020B4NUWI5ND31DW020B4NUWI5N91
D31DW020B5NKWD31DW020B5NKW91
D31DW020D1NUWD31DW020D1NUW91
D31DW020D2NJW3AD31DW020D2NJW3A91
D31DW020D4NJDLJ5D31DW020D4NJDLJ591
D31DW020D4NJW3AD31DW020D4NJW3A91
D31DW021C4NJWC060699D31DW021C4NJW91C060699
