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整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
伺服阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等
D81VW003C4NYPF
D81VW003C4NTW D81VW003C4NTW
D81VW004C4NJP DIR CNTRL SOLENOID
D81VW009C6NJW D81VW009C6NJW91
D81VW031C4NJWX591 D81VW031C4NJW91X591
D81VW004C1NTW3A D81VW004C1NTW3A91
D81VW004C4NJW3A D81VW004C4NJW3A91
D81VW004C4NJW3B D81VW004C4NJW3B91
D81VW004C1NTW D81VW004C1NTW91
D81VW004C4NJW D81VW004C4NJW91
D81VW020B4VJW D81VW020B4VJW91
D81VW001C4NJW D81VW001C4NJW91
D81VW003C4NYW D81VW003C4NYW91
D81VW004C2NJW D81VW004C2NJW91
D81VW003C1NJW D81VW003C1NJW91
D81VW020B4NJW D81VW020B4NJW91
D81VW003C4NJW D81VW003C4NJW91
D81FHA31H2NB08 D81FHA31H2NB0848
D81FHB31E4NB00 D81FHB31E4NB0047
D81FEE01HC2VK00 D81FEE01HC2VK0020
D81FHB11H1NS00 D81FHB11H1NS0047
D81FHB11H4NS00 D81FHB11H4NS0047
D81FHB12H4NS00 D81FHB12H4NS0047
D81FHB31F2VB00 D81FHB31F2VB0047
D81FHB31H1NS00 D81FHB31H1NS0047
D81FHB32F1VE00 D81FHB32F1VE0047
D81FHB32F2NE00 D81FHB32F2NE0047
D81FHE01E2NB08 D81FHE01E2NB0848
D81FHE01F1NB00 D81FHE01F1NB0047，好处只有一个：动态性能是所有液压阀中最高的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天PFG-128齿轮泵 PFG-135-D-RO齿轮泵
PFG-135齿轮泵 PFG-142-D-RO齿轮泵
PFG-142齿轮泵 PFG-149-D-RO齿轮泵
PFG-149齿轮泵 PFG-160-D-RO齿轮泵
PFG-160齿轮泵 PFG-174-D-RO齿轮泵
PFG-174齿轮泵 PFG-187-D-RO齿轮泵
PFG-187齿轮泵 PFG-199-D-RO齿轮泵
PFG-199齿轮泵 PFG-207-D-RO齿轮泵
PFG-207齿轮泵 PFG-210-D-RO齿轮泵
PFG-210齿轮泵 PFG-211-D-RO齿轮泵
PFG-211齿轮泵 PFG-214-D-RO齿轮泵
PFG-214齿轮泵 PFG-216-D-RO齿轮泵
PFG-216齿轮泵 PFG-218-D-RO齿轮泵
PFG-218齿轮泵 PFG-221-D-RO齿轮泵压力开关PSB160AF1A；PSB250AF1A；
节流阀FM2DDSV；FM3DDSV；FM2BBKV；FM2DDSV55;FM2DDKV；9N1600S；N200B；9F200S；9F400B；
直动式溢流阀EVSA315A101；RDM2ATBT35SV10；
先导式溢流阀R10R25S4SN；RM2AT17SV；RM2BT17SV；
比例溢流阀RE06M35T2N1G0；RE06M17W2V1XW；
座阀式换向阀D1SE83BNJW；
滑阀式换向阀D1VW009CNTW；D1VW011ENJW91；D1VW2ENJP75;D1VW104KNJW；D1VW022CNJW91；D1VW008ENJW；D1VW008CNJW；D1VW008CNJP75;D1VW1CNJP75;D1VW008CNJP70;D1VW010CNJW；D1VW002CNJW；D1VW010CVJW；D1VW015CVJW；D1VW004NJW；D1VW006CNJW；D1VW004CNJW；D3DW21CNJP；
电动式换向阀D4VW004C2NTW；D3W1KNJW；D3W1KNJP；D3W1CNJW；D3W1ENJP30
SCP-010-14-06
SCP-010-34-06
SCP-010-34-07
SCP-016-14-06
SCP-016-44-06
SCP-025-34-06
SCP-025-34-07
SCP-040-44-06
SCP-060-14-06
SCP-060-24-06
SCP-060-24-07
SCP-060-34-07
SCP-060-44-07
SCP-060-B4-07-MO
SCP-1000-34-06-EX
SCP-1000-72-08
SCP-100-14-06
SCP-100-24-06
SCP-100-24-07
SCP-100-34-06
SCP-100-34-07
SCP-100-44-07
SCP-160-14-06
SCP-160-24-06
SCP-160-24-07
SCP-160-34-06
SCP-160-44-06
SCP-160-A4-07-MO
SCP-250-14-06
SCP-250-24-06
SCP-250-24-07
SCP-250-34-06
SCP-250-34-07
SCP-250-44-06
SCP-250-44-07
SCP-400-14-06
SCP-400-14-07
SCP-400-24-06
SCP-400-24-07
SCP-400-34-06
SCP-400-34-07
SCP-400-44-06
SCP-400-44-07
SCP-600-14-06
SCP-600-24-06
SCP-600-24-07
SCP-600-34-06
SCP-600-34-07
SCP-600-44-06
SCP-600-44-07
SCP-600-A4-07-MO
SCPSD-004-14-15
SCPSD-004-14-25
SCPSD-010-04-17
SCPSD-010-04-27
SCPSD-010-14-15
SCPSD-010-14-17
SCPSD-010-14-25
SCPSD-016-04-16
SCPSD-016-04-17
SCPSD-016-04-26
SCPSD-016-04-27
SCPSD-016-14-15
SCPSD-016-14-17
SCPSD-016-14-25
SCPSD-0250P-17-27
SCPSD-060-04-16
SCPSD-060-04-17
SCPSD-060-04-26
SCPSD-060-04-27
SCPSD-060-14-15
SCPSD-060-14-17
SCPSD-060-14-25
SCPSD-060-14-27
SCPSD-100-04-17
SCPSD-100-04-26
SCPSD-100-04-27
SCPSD-100-14-15
SCPSD-100-14-17
SCPSD-100-14-27
SCPSD-250-04-16
SCPSD-250-04-17
SCPSD-250-04-26
SCPSD-250-04-27
SCPSD-250-14-15
SCPSD-250-14-17
SCPSD-250-14-25
SCPSD-250-14-27
SCPSD-3000P-17-27
SCPSD-400-04-16
SCPSD-400-04-17
SCPSD-400-04-26
SCPSD-400-04-27
SCPSD-400-14-15
SCPSD-400-14-17
SCPSD-400-14-25
SCPSD-400-14-27
SCPSD-600-04-16
SCPSD-600-04-17
SCPSD-600-14-15
SCPT-015-02-02
SCPT-016-C2-05
SCPT-060-02-02
SCPT-060-C2-05
SCPT-1000-02-02
SCPT-1000-C2-05
SCPT-150-02-02
SCPT-150-02-02-PQC
SCPT-400-02-02
SCPT-400-C2-05
SCPT-600-02-02
SCPT-600-02-02-PQC
SCPT-600-C2-05
SCP-400-20-06
SCP-400-32-07
SCP-250-34-07-UCC
SC-250-00-07
SC-250-10-05
SC-250-10-07
SC-370-00-07
SC-370-10-05
SC-370-10-07
SC-520-00-07
SC-520-10-05
SC-520-10-07
SCLTSD-250-00-07
SCLTSD-250-10-05
SCLTSD-250-10-07
SCLTSD-250-XX-07-S1
SCLTSD-370-00-07
SCLTSD-370-10-05
SCLTSD-370-10-07
SCLTSD-520-00-07
SCLTSD-520-10-05parker截止阀VE83-A-S-5
parker截止阀VE43-A-S-5
parker阀R5V12-333- 12-A1
parker电磁阀E131K0450
parker电磁阀322K4106
parker阀门RK3
parker阀门D3W004CNGW
parker减压阀EVSA315A0613Z
parker减压阀R5V12 393 12 09G0Q A1
parker柱塞泵F11-005-RB-CV-K-000-000-0 NO.
parker液压马达 F12-040-MF-IV-K-000-000-0
parker电缆CAVORESX10PM-ISPD/TWIN-C
parker电缆CAVOMOT1.5X10PM-I82-C 1.5mm2×10m
parker电机TWIN2-R53
parker电机TWIN8-R53/A/K006
parker电机SPD16NS-R54
parker电机TWIN5-R53/A/K006
parker比例阀D41FHB63C4NB0041
parker比例阀D1FVE50BCVLB30
parker液位控制器SCTSD-150-00-07
parker电磁阀D3W004CNJW42
parker液压泵 F12-030-MF-IV-K-000-000-0
parker液压泵 F11-005-MB-CV-K-000
parker气动流量控制阀B3250X
parker齿轮泵PGP517A0520CM1H3NP4P3B1B1
parker泵PV040R1K1T1NUPM
parker液压泵
parker附件
parker夹紧装置VBH603C
parker变送器SCPSD-250-04-27
parker放大器PWD00A-400
parker放大器PWD00A-400-19
parker液压缸F11-010-RB-CN-K-000 Nr.
parker油压传动阀D1FVE02CC0NM0311
parker液压马达F12-030-MF-CV-C-235-000-P
parker油缸VB609C
parker减压阀D3W020BVJW
parker减压阀D3W004CVJW
parker节流阀FM4DDFVHT
parker液压阀D1VW006KNJW
parker液压阀PVAC2PCMNSJW35
parker阀TE0330CW261AAAB
parker接头SCK-400-02-55
parker液位液温控制器SCLTSD-250-00-07
parker止回阀D1VW020HNJW91
parker止回阀D1VW026BNJW91
parker放大器PCD00A-400
parker压力开关P8S-GRFLX
parker干燥剂MDK6
parker三通换向阀PXB-B3912
parker排水阀ED2010/50-G230
parker驱动器SLVD5ND
parker阀门D3W001FNJW42
parker横切机直线引动器LBB080SH02600FRR00000CNN
parker单向节流阀FM3DDSV51
parker溢流阀RM3PT25SV11
parker压力开关PXB-B4935
