SV10PA1-42液压单向阀原装现货由上海韦米机电设备有限公司专业提供

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SV10PA1-42液压单向阀原装现货

单向阀、液控单向阀、SV/SL型液控单向阀、叠加式液控单向阀

1.结构和工作原理

单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动。单向阀有直通式和直角式两种。如图15、图16所示。

SV和SL型液控单向阀都是座式阀，由液压开启，能给出反向流。

这种阀用来隔离局部压力回路，即作为在管子破裂时防止负载降落的保护，也可防止负载下爬。这种液控单向阀主要包括阀体、主阀、先导阀、压缩弹簧和控制活塞 。

SV型阀(无泄油口)一一泄漏油内部回油

由A口至B口始终可以流动。反方向上则导阀和主阀被压缩弹簧和系统压力保持在阀座上。若X口供给压力油则控制活塞被推向右。

这先打开导阀，然后打开主阀。于是油液先通过导阀，然后通过主

导阀。为了保证用控制活塞能可靠地操纵，需要一定的低控制压力。

SL型阀(带泄油口)-一-泄漏油外部回油

在原理上，此阀与SV型有相同的功能。不同之处在于增加了泄油口Y,这就可使控制活的环形面积与A口隔离。A口来的油压只作用在控制活塞的面积A4上，从而有效地降低此条件下所需的控制压力。

液控单向阀是依靠控制流体压力，可以使单向阀反向流通的阀。这种阀在煤矿机械的液压支护设备中占有较重要的地位。液控单向阀与普通单向阀不同之处是多了一个控制油路K，当控制油路未接通压力油液时，液控单向阀就象普通单向阀一样工作，压力油只从进油口流向出油口，不能反向流动。当控制油路有控制压力输入时，活塞顶杆在压力油作用下向右移动，用顶杆顶开单向阀，使进出油口接通。若出油口大于进油口就能使油液反向流动。

SV10PA1-42液压单向阀原装现货型号

力士乐REXROTH液控单向阀SV 6

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力士乐液控单向阀SV 10...32

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力士乐REXROTH液控单向阀SL 6

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控制阀是自控系统中的执行器，它的应用质量直接反应在系统的调节品质上。作为过程控制中的终端元件，人们对它的重要性较过去有了更新的认识。调节阀应用的好坏，除产品自身质量、用户是否正确安装、使用、维护外，正确地计算、选型十分重要。由于计算选型的失误，造成系统开开停停，有的甚至无法投用，所以对于用户及系统设计人员应该认识阀在现场的重要性，必须对调节阀的选型引起足够的重视。