上海杰尔德液压有限公司 收藏

R901353070 德国力士乐比例溢流阀DBEME20-71/315YG24K31A1M

由于各种原因，空气被吸入油液中，或者在油液压力低于大气压时，溶解在油液中的部分空气就会析出形成气泡，这些气泡在低压区时体积较大，当随油液流到高压区时，受到压缩，体积突然变小或气泡消失；反之，如在高压区时体积本来较小，而当流到低压区时，体积突然增大，油中气泡体积这种急速改变的现象。

气泡体积的突然改变会产生噪声，又由于这一过程发生在瞬间，将引起局部液压冲击而产生振动。先导式溢流阀的导阀口和主阀口，油液流速和压力的变化很大，很容易出现空穴现象，由此而产生噪声和振动。

溢流阀在使用中有时会出现调压失灵现象。先导式溢流阀调压失灵现象有二种情况：一种是调节调压手轮建立不起压力，或压力达不到额定数值；另一种调节手轮压力不下降，甚至不断升压。出现调压失灵，除阀芯因种种原因造成径向卡紧外，还有下列一些原因：

***是主阀体阻尼器堵塞，油压传递不到主阀上腔和导阀前腔，导阀就失去对主阀压力的调节作用。因主阀上腔无油压力，弹簧力又很小，所以主阀变成了一个弹簧力很小的直动型溢流阀，在进油腔压力很低的情况下，主阀就打开溢流，系统就建立不起压力。

压力达不到额定值的原因，是调压弹簧变形或选用错误，调压弹簧压缩行程不够，阀的内泄漏过大，或导阀部分锥阀过度磨损等。

***是阻尼器堵塞，油压传递不到锥阀上，导阀就失去了支主阀压力的调节作用。阻尼器（小孔）堵塞后，在任何压力下锥阀都不会打开溢流油液，阀内始终无油液流动，主阀上下腔压力一直相等，由于主阀芯上端环形承压面积大于下端环形承压面积。

所以主阀也始终关闭，不会溢流，主阀压力随负载增加而上升。当执行机构停止工作时，系统压力就会***升高。除这些原因以外，尚需检查外控口是否堵住，锥阀安装是否良好等。

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三大承诺：
1、***全新***
2、***安全准时发货
3、***售后服务质量
订购流程：

2、我方会根据询价单型号查询价格以及交货期，拟一份详细正规报价单给贵方采购员；
3，客户收到报价单并确认型号无误后如需订购产品；
4、报价单负责人根据客户提供型号以及数量拟份销售合同；
5、客户收到合同查阅同意后盖章回传并按照合同销售金额汇款到公司开户行
6、我公司财务查到款后，业务员安排发货并通知客户跟踪运单确认收到货

我们的流程是 询价→报价→合同→订货→发货→售后，我们本着信誉、客户至上、品牌服务、规范管理的经营理念竭诚为您服务

产品报价及货期说明 因工业液压、自动化各进口品牌备件型号繁多，欧美产品价格货期实时变化，因此很难实时标出准确价格，故具体产品信息、报价及货期请以我公司报价单为准 ,给您带来不便敬请谅解！以上信息由上海杰尔德公布，。感谢您的合作，竭诚为您服务。