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伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀不能输出足够的压力来推动主阀芯动作。 而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力＝t口压力＋阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t口压力又为零，那么p口的压力不足以供给前置级阀来推动主阀芯，整个伺服阀失效了。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。parkerD41FBB00FC4NKW0840减压阀 parkerD91FTE01HC4NF0040减压阀 parkerPS100-POHD-DB压力开关 parkerD3W034CNTW42减压阀 parkerD1VW010CNTW91减压阀 parkerRS10R35S4SN1JW阀 parkerD3W004CNJW阀 parkerFM3DDDSV阀 parkerRM3PT25SV阀 parkerD3W008CNJW42阀 parkerFM3DDSV51阀 parkerPV040R1K8T1NMMC阀 parker104440876379，8-379 ; 11.028O形密封圈 parkerPARKER D1VW020BNJEE91减压阀 parkerDWLC522P20B减压阀 parkerFM4DDFVHT减压阀 parkerR25R25S4SN减压阀 parkerPARKER D1VW020BVJEE91减压阀 parkerD1VW010CNJW减压阀 parkerD31FHE02C1NB00减压阀 parkerVMY160A10V1P减压阀 parkerD1FVE50BCVLB35减压阀 parkerD1VW008CNJW减压阀 parkerD3W001CNJW止回阀 parkerPVP16364R26A112泵 parkerPV016R1K1T1NMMC柱塞泵 parkerD3W1KNTW30阀 parkerPRDM2PP21SVG阀 parkerHP-010-2-S1220-12-1插入式环油路接头 parkerD91FWB32HC2VLW025减压阀 AM22061A-R230 AS22101A-R230, AS22061A-G24 AS32061A-R230 AS32060B-R230 AM22100B-G24, AM22101A-G24, AM22100B-G24, AM22061A-G24, AS22101A-G24, AM22101A-G24, AS22061A-G24, AS32060B-G24, AS32061A-G24 AS4306-G24, AS430b-G24, AS32101A-G24, AM22060b-G24, AS22060b-G24, AS22100b-G24, AM32061a-G24, AM32101a-G24, AM32060b-G24, AM32100b-G24, AS32100B-G24, AH22061A-G24,DPZO-A-271-S5/DG30 DPZO-A-271-S5/E30 DPZO-A-271-S5/G DPZO-A-273-D5 DPZO-A-273-D5/G DPZO-A-273-L530 DPZO-A-273-L5/D30 DPZO-A-273-L5/D30/WG DPZO-A-273-L5/DG DPZO-A-273-L5/E30 DPZO-A-273-L5/G30 DPZO-A-273-S3 DPZO-A-273-S3/DG30 DPZO-A-273-S530 DPZO-A-273-S5/D DPZO-A-273-S5/DG DPZO-A-273-S5/G30 DPZO-A-371-L5/D30 DPZO-A-371-L5/DEG/1830 DPZO-A-371-L5/E DPZO-A-371-S530 DPZO-A-371-S5/D DPZO-A-371-S5/EG30 DPZO-A-373-D5 DPZO-A-373-D5/D30/WG DPZO-A-373-D5/DEG DPZO-A-373-L5/DG30 DPZO-A-373-L5/G30 DPZO-A-373-S5/DG DPZO-A-373-S5/G30 DPZO-AE-171-L5/E DPZO-AE-173-05/DGI DPZO-AE-173-L5/GI10 DPZO-AE-271-D5/I30 DPZO-AE-271-L530 DPZO-AE-271-S530 DPZO-AE-271-S5/D DPZO-AE-273-D530 DPZO-AE-273-L5/GI30 DPZO-AE-273-S530 DPZO-AE-273-S530/WG DPZO-AE-371-D5/E DPZO-AE-371-S5/D30 DPZO-AE-373-L5/D30 DPZO-AE-373-L5/GI30 DPZO-L-270-L5 DPZO-L-270-L5/D40 DPZO-L-270-L5/DE DPZO-L-270-L5/G40 DPZO-L-271-L5 DPZO-L-271-L5/E40 DPZO-L-271-S5 DPZO-L-271-S5/D DPZO-L-273-L540 DPZO-L-273-L5/G DPZO-L-273-S5 DPZO-L-273-S5/D DPZO-L-273-S5/G40 DPZO-L-351-L5/G40 DPZO-L-673-D520/WG DPZO-LE-170-L5 DPZO-LE-171-L5 DPZO-LE-173-L5/I40 DPZO-LE-270-L5/D40/WG DPZO-LE-270-L5/DI40 DPZO-LE-271-L540 DPZO-LE-271-S5 DPZO-LE-371-S5 DPZO-LE-373-L540 DPZO-T-251-L5/E40 DPZO-T-271-D3/D DPZO-T-271-L5 DPZO-T-271-S5 DPZO-T-271-S5/D DPZO-T-273-S5/D DPZO-TE-171-L5/DI40 DPZO-TE-173-L5/DI40 DPZO-TE-271-D5 DPZO-TE-271-D5/I DPZO-TE-271-L5 DPZO-TE-271-L5/E DPZO-TE-271-L5/I40 DPZO-TE-271-S5 DPZO-TE-271-S5/I40 DPZO-TE-273-L5/D40 DPZO-TE-273-L5/DI40 DPZO-TE-371-S540 先导式减压阀 KZGO-A-031/21020 KZGO-A-031/315 HZGO-A-031/10031 HZGO-A-031/21031 HZGO-A-031/31531 HZGO-A-031/315/1831 HZMO-A-030/21040 ATSO放大器 E-BM-AC-011F E-BM-AC-01F11/2 E-BM-AC-01F11/3 E-BM-AC-01F/RR11/A1 E-BM-AC-05F11/3 E-BM-AC-05F11/4 E-BM-AC-05F/RR11/3 E-ME-AC-01F20 E-ME-AC-01F20/1 E-ME-AC-01F20/2 E-ME-AC-01F20/3 E-ME-AC-01F20/4 E-ME-AC-01F20/6 E-ME-AC-01F20/A1 E-ME-AC-01F20/A2 E-ME-AC-01F20/A4 E-ME-AC-01F/4R-420 E-ME-AC-01F/4R-420/2 E-ME-AC-01F/4R-420/3 E-ME-AC-01F/4R-420/6 E-ME-AC-01F/I20 E-ME-AC-01F/I20/2 E-ME-AC-01F/I20/4 E-ME-AC-01F/I20/6 E-ME-AC-01F/RR20/4 E-ME-AC-01F/RR20/A2 E-ME-AC-01F/RR-420 E-ME-AC-01F/RR-420/3 E-ME-AC-01F/RR-420/6 E-ME-AC-01F-420/2 E-ME-AC-05F20 E-ME-AC-05F20/2 E-ME-AC-05F20/3 E-ME-AC-05F20/4 E-ME-AC-05F20/A3 E-ME-AC-05F/4R-420/3 E-ME-AC-05F/4R-420/4 E-ME-AC-05F/I20 E-ME-AC-05F/I20/3 E-ME-AC-05F/I20/4 E-ME-AC-05F/RR20 E-ME-AC-05F/RR20/3DPZO-A-371-L5/DG DPZO-A-373-D5/E30 DPZO-A-373-L5 DPZO-A-671-L5 DPZO-AE-171-S5/E DPZO-AE-171-S5/G DPZO-AE-171-S5/G+SP-ZH-7P DPZO-AE-171-L5/E DPZO-AE-173-S5 DPZO-AE-173-L5/I DPZO-AE-251-L5/I DPZO-AE-271-L5 DPZO-AE-271-L5/D DPZO-AE-271-L5/DIQ DPZO-AE-273-D5/DG DPZO-AE-273-L5 DPZO-AE-273-S5/DIWG DPZO-AE-371-S5 DPZO-AE-371-D5/EG DPZO-AE-373-S5 DPZO-AES-PS-271-S5 DPZO-AES-PS-273-L5/IZ DPZO-AES-BC-273-L5/BT DPZO-T-271-L5 DPZO-TE-171-L5 DPZO-TE-173-S5/I DPZO-TE-251-L5/I DPZ0-TE-271-L5/D DPZO-TE-271-S540 DPZO-TE-273-L5/I DPZO-TE-371-L5/E
