REXROTH比例方向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zui大、要么zui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。

REXROTH比例方向阀2WRC精选型号：

R900249561     2WRC63K001-1X/S/V
R900532140     2WRC125D001-1X/P/M
R900555439     2WRCE63D001-1X/SG24/M
R900557919     2WRC63D001-1X/S/M
R900561427     2WRC125D001-1X/P/LM
R900563521     2WRC80D001-1X/P/M
R900579998     2WRC63K001-1X/S/M
R900722318     2WRCE50S1600L-2X/PG24K31/A1V
R900722320     2WRCE40S700R-2X/PG24K31/A1V
R900724810     2WRCE32S650L-2X/PG24K31/C1V
R900740692     2WRCE32S650L-2X/PG24K31/A1V
R900747059     2WRCE50S1600L-2X/PG24K31/A1M
R900748262     2WRCE40S900P-2X/PG24K31/A1V
R900754702     2WRCE32S650L-2X/PG24K31/A1M
R900768141     2WRCE40S700R-2X/SG24K31/A1M
R900768255     2WRCE32S185R-2X/SG24K31/A1M
R900768256     2WRCE32S480R-2X/SG24K31/A1M
R900768408     2WRCE32S650L-2X/SG24K31/A1M
R900768412     2WRCE40S1000L-2X/SG24K31/A1M
R900770094     2WRCE50S1600L-2X/SG24K31/A1M
R900777068     2WRCE50S1450P-2X/SG24K31/A5V
R900779934     2WRCE40S700R-2X/PG24K31/A1M
R900780155     2WRCE40S1000L-2X/PG24K31/A1M
R900782032     2WRC50S1100R-2X/SK31/M
R900784515     2WRCE50S1100R-2X/SG24K31/A1M
R900905436     2WRC80K001-1X/S/M
R900929765     2WRC125D001-1X/S/M
R900929766     2WRC100D001-1X/S/M
R900929866     2WRC80D001-1X/S/M
R900942518     2WRC100K001-1X/S/M
R900946858     2WRC80K001-1X/PK31/M-125
R900948318     2WRC80K001-1X/E/M
R900955239     2WRC63K001-1X/E/M
R900955240     2WRC125K001-1X/E/M
R900957283     2WRC125S001-1X/S/M
R900960793     2WRC160D001-1X/S/M
R900960899     2WRC63S001-1X/S/M
R900964224     2WRC160K001-1X/S/M
R900964225     2WRC125K001-1X/S/M
R900976554     2WRC80S003-1X/E/M
R901001436     2WRC100D001-1X/P/M
R901002171     2WRCE40S1000L-2X/PG24K31/A1V
R901002174     2WRCE40S1000L-2X/PG24K31/A1WL15V
R901012830     2WRCE40S900P-2X/SG24K31/A1M
R901017909     2WRCE40S700R-2X/SG24K31/A1WK15M
R901018142     2WRCE32S480R-2X/SG24K31/A1WK15M

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