美國派克PARKER液壓閥[PARKER換向閥]Parker派克D3W/D3DW系列帶電感位置控制電磁換向閥是一種通過電磁鐵直接操縱的帶電感位置控制的2位4通換向閥，可被用作監控閥?？梢杂羞x擇的對初始位置或終點位置進行監控。只有單電磁鐵閥可以用于位置控制。斷電時換向閥的可靠位置為初始位置，其通過復位彈簧來保持的。美國派克PARKER液壓閥液壓閥（即控制元件）在液壓系統中控制和調節液體的壓力、流量和方向。根據控制功能的不同，液壓閥可分為村力控制閥、流量控制閥和方向控制閥。壓力控制閥又分為益流閥（安全閥）、減壓閥、順序閥、壓力繼電器等;流量控制閥包括節流閥、調整閥、分流集流閥等;方向控制閥包括單向閥、液控單向閥、梭閥、換向閥等。根據控制方式不同，液壓閥可分為開關式控制閥、定值控制閥和比例控制閥。
液壓閥可分為普通液壓控制閥、伺服控制閥、比例控制閥。根據安裝形式不同，液壓閥還可分為管式、板式和插裝式等若干種。
液壓閥的基本結構主要包括閥芯、閥體和驅動閥芯在閥體內做相對運動的操縱裝置。閥芯的主要形式有滑閥、錐閥和球閥；閥體上除有與閥芯配合的閥體孔或閥座孔外，還有外接油管的進、出油口和泄油口；驅動閥芯在閥體內做相對運動的裝置可以是手調機構，也可以是彈簧或電磁鐵，有些場合還采用液壓力驅動。 美國派克PARKER液壓閥在工作原理上，液壓閥是利用閥芯在閥體內的相對運動來控制閥口的通斷及開口的大小，以實現壓力、流量和方向控制。液壓閥工作時，所有閥的閥口大小、閥進、出油口間的壓差以及通過閥的流量之間的關系都符合孔口流量公式（q＝KA·Δp m），只是各種閥控制的參數各不相同而已。
美國派克PARKER液壓閥，PARKER公司如下：
6PDSH102CTA240LD-6TDSH102CTD012LDDSH102CTD024LD-A8TDSH102CTD024LD-6PDSH102CTD024LD-8BDSH102CTD024LWP-8PDSH102CTVDSH102CTVA120LC-4PDSH102CTVA120LC-6PDSH102CVDSH102CVD024LDDSH102CVD024LD-A6PDSH102NDSH102NA120LCDSH102NA120LC-A8PDSH102NA120LC-4PDSH102NA120LC-6TDSH102NA120LC-8PDSH102NA120LC-8TDSH102NA120LDDSH102NA120LD-8PDSH102NA120LD-8TDSH102NA240LDDSH102NA240LD-8BDSH102ND012LDDSH102ND012LD-A6TDSH102ND012LD-6PDSH102ND012LP-A8TDSH102ND012LWDSH102ND012LW-A8TDSH102ND024LC-8PDSH102ND024LC-8TDSH102ND024LDDSH102ND024LD-6BDSH102ND024LD-6PDSH102ND024LD-8BDSH102ND024TGR-A6TDSH102NTDSH102NTA120LCDSH102NTA120LDDSH102NTD012LDDSH102NTD024LC-8TDSH102NTD024LDDSH102NTD024LD-6BDSH102NTVDSH102NTVA120LC-6PDSH102NVDSH102NVD024LDDSH102NVD024LD-A8PDSH103DSH103ADSH103AA120LCDSH103AA120LC-8PDSH103AD012LDDSH103AD024LDDSH103AD024LD-6TDSH103AD024LWD6DSH103AD024LWS-6TDSH103ATDSH103AVD024LWDSH103A120LCDSH103A120LC-4PDSH103A120LC-6PDSH103A120LC-8PDSH103A120LDDSH103A120LD-6TDSH103A240LC-8PDSH103BDSH103BA120LDDSH103BD012LC-A6TDSH103BD012LDDSH103BD024LC-A6TDSH103BD024LDDSH103BD024LW-8TDSH103BTDSH103BTA120LCDSH103BTD024LDDSH103BTD024LWDRDSH103BTND024LC-8PDSH103BTVD024LDDSH103BVDSH103D012LDDSH103D012LD-A6TDSH103D012LD-6TDSH103D012LW-4PDSH103D012LWPDSH103D024LCDSH103D024LC-4PDSH103D024LDDSH103D024LD-A8TDSH103D024LD-6PDSH103D024LD-6TDSH103D024LD-8BDSH103D024LD-8TDSH103D024LWDSH103D024LWDDSH103D024LWD6DSH103D024LWPDSH103D024LWP-8BDSH103NDSH103NA120LC-A6TDSH103NA120LD-A8TDSH103ND012LC-6PDSH103ND012LD-A6TDSH103ND012LD-8TDSH103ND012LPDSH103ND024LDDSH103ND024LD-6PDSH103ND024LWDSH103NTDSH103NTVDSH103NVDSH103NVD024LD-6PDSH103TDSH103TA120LC-A6TDSH103TA120LDDSH103TA120LD-A8TDSH103TA240LD-8TDSH103TD012LD-6BDSH103TD012LP-6TDSH103TD024LDDSH103TD024LWDRDSH103TVDSH103TVA120LD-4PDSH103TVA120LD-6PDSH103TVD024LDDSH103TVD024LD-8TDSH103VDSH103VD024LDDSH103VD024LWDDSH104BDSH104BA120C-6PDSH104BA120C-8PDSH104BA120LC-A8PDSH104BA120LC-6PDSH104BA120LC-8PDSH104BA120LDDSH104BA120LD-A6TDSH104BA120LD-4PDSH104BD012LDDSH104BD024LDDSH104BD024LD-A6TDSH104BD024LD-6BDSH104BD024LD-6TDSH104BD024LJDSH104BTDSH104BTA120LDDSH104BTA120LD-A6PDSH104BTA240LD-8PDSH104BTA240LD-8TDSH104BTD024LDDSH104BTVDSH104BVDSH104BVA120LC-4PDSH104BVA120LD-4PDSH104BVA120LD-6PDSH104B2DSH104B2TDSH104B3DSH104E1DSH104E1D012LP-8TDSH104E1D024LDDSH104E1TDSH104E1VDSH104E15DSH104E15TDSH104E4DSH104E4D024LDDSH104E4TDSH104MDSH104MD024LDDSH104MTDSH104MTD024LDDSH104MVDSH104NDSH104ND012LD-6BDSH104NTDSH104NVDSH106C6DSH106C6A120LDDSH106C6A240LDDSH106C6D024LDDSH106C6EDSH106C6MDSH106C6MA120LDDSH106C6MA120LD-A6TDSH106C6MD024LDDSH106C6MD024LD-6BDSH106C6TDSH106C6TA120LC-8PDSH106C6TVDSH106C6VDSH121CDSH121CA120LD-A12TDSH121CA120LD-12TDSH121CD012LP-12TDSH121CD024LDDSH121CD024LWD-12PDSH121CHDSH121CHRDSH121CHRTDSH121CHRTA120LC-8TDSH121CHRTVDSH121CHRTVA120LC-A12PDSH121CHRVDSH121CHRVA120LC-A12PDSH121CHRVA120LDDSH121CHRVD024LC-A8TDSH121CHTDSH121CHTVA120LC-A12PDSH121CRDSH121CRA120LCDSH121CRA120LC-12PDSH121CRA120LC-8PDSH121CRA120LDDSH121CRA120LD-A6PDSH121CRA120LD-12TDSH121CRA120LD-6PDSH121CRD012LDDSH121CRD012LMRDSH121CRD012LP-12TDSH121CRD012LWDSH121CRD012LWPDSH121CRD024LDDSH121CRD024LD-A8PDSH121CRD024LD-12BDSH121CRD024LP-12TDSH121CRD024LPR-12TDSH121CRD024LWDSH121CRTDSH121CRTA120LDDSH121CRTA120LD-12PDSH121CRTA240LDDSH121CRTD012LD-12PDSH121CRTD024LDDSH121CRTD024LWDSH121CRTVDSH121CRTVA120LC-A8TDSH121CRTVA120LC-12PDSH121CRVDSH121CTDSH121CTA120LCDSH121CTA120LD-8TDSH121CTA240LC-12PDSH121CTD012LP-12TDSH121CTD024LD-A8TDSH121CTVDSH121CTVA120LCDSH121NDSH121NA120LC-12PDSH121NA120LDDSH121NEDSH121NEA120LDDSH121NED012LDDSH121NMDSH121NMA120LDDSH121NMD024LDDSH121NRDSH121NRA120LC-12PDSH121NRA120LC-8TDSH121NRA120LDDSH121NRA120LD-12TDSH121NRD012LWPDSH121NRD024LDDSH121NRD024LD-A12TDSH121NRD024LD-8PDSH121NRD024LWDSH121NRD024LW-8BDSH121NRD024LWD-12TDSH121NREDSH121NREA120LC-12TDSH121NREA120LDDSH121NREA120LD-8TDSH121NREVD024LD-A12TDSH121NRMDSH121NRMA120LC-12TDSH121NRMA120LDDSH121NRMA120LD-12TDSH121NRMA120LD-8TDSH121NRMD012LP-12TDSH121NRTDSH121NRTA120LDDSH121NRTA120LD-12PDSH121NRTD024LDDSH121NRTVDSH121NRVDSH121NTDSH121NVDSH164HDSL-2166DSL-2166-0DSL08D6CDSL08D6CA120LCDSL08D6CA120LC-A6PDSL08D6CA120LDDSL08D6CA120LD-6PDSL08D6CD012LW-4TDSL08D6CD024LDDSL08D6CD024LDRDSL08D6CTD012LPDSL080DCDSL080DCA120LCDSL080DCA120LC-4TDSL080DCA120LC-6PDSL080DCA120LC-6TDSL080DCA120LDDSL080DCA120LD-A4PDSL080DCA120LD-4TDSL080DCA240LDDSL080DCD012LW-A6TDSL080DCD024LDDSL080DCD024LD-A6BDSL080DCD024LD-
美國派克PARKER液壓閥[PARKER換向閥]，PARKER電磁換向閥
