調(diào)速閥是由定差減壓閥與節(jié)流閥串聯(lián)而成的組合閥。節(jié)流閥用來調(diào)節(jié)通過的流量，定差減壓閥則自動補償負(fù)載變化的影響，使節(jié)流閥前后的壓差為定值，消除了負(fù)載變化對流量的影響[1] 。
節(jié)流閥前、后的壓力分別引到減壓閥閥芯右、左兩端，當(dāng)負(fù)載壓力增大，于是作用在減壓閥芯左端的液壓力增大
，閥芯右移，減壓口加大，壓降減小，從而使節(jié)流閥的壓差（p2-p3）保持不變；反之亦然。這樣就是調(diào)速閥的流量恒定不變（不受負(fù)載影響）。
調(diào)速閥也可以設(shè)計成先節(jié)流后減壓的結(jié)構(gòu)。
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2FRM 16-3X/160L/PL
R900205503
2FRM 6 A36-3X/1,5QRV
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2FRM 6 A36-3X/3QRV
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2FRM 6 A36-3X/6QRV
R900205506
2FRM 6 B36-3X/1,5QMV
R900205507
2FRM 6 B36-3X/1,5QRV
R900205508
2FRM 6 B36-3X/10QMV
R900205509
2FRM 6 B36-3X/10QRV
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2FRM 6 B36-3X/16QMV
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2FRM 6 B36-3X/16QRV
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2FRM 6 B36-3X/25QMV
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2FRM 6 B36-3X/32QMV
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2FRM 6 B76-3X/32QMV
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2FRM 6 B76-3X/32QRV
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2FRM 6 B76-3X/6QMV
R900205528
2FRM 6 B76-3X/6QRV
R900205576
2FRM 6 A36-3X/0,6QRV
R900205577
2FRM 6 B36-3X/1,5QRV調(diào)速閥Rexroth
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