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大口径阀门为啥开关困难?解决方法是啥?

点击次数:133 发布时间:2019-09-07

    在日常使用大口径截止阀的用户中,大家常常反映一个问题,即大口径截止阀用于压差比较大的介质上,如蒸汽、高压水等带压工作时,往往很难关闭,无论怎样用力关闭,总是发现会有泄漏现象,很难关紧,造成这一个问题的原因是由阀门的结构设计与人的极限水平输出力矩不足而造成的。

    大口径阀门开关困难原因分析

    一般大人的水平极限输出力为60-90kg,视不同体质而言。

    一般截止阀的流向设计为低进高出,当人对阀门进行关闭时,人体水平推动手轮转动,使阀瓣向下运动,实现关闭,这时需要克服三个方面的力的组合,即:

    1) 轴向顶推力Fa;

    2) 填料与阀杆磨擦力Fb;

    3) 阀杆与阀瓣芯部接触摩擦力Fc

    LIJUZONGHEWEI∑M=(Fa+Fb+Fc)R

     KEYIKANCHUKOUJINGYUEDA,ZHOUXIANGDINGTUILIYEYUEDA,DANGJIEJINGUANBIZHUANGTAISHI,ZHOUXIANGDINGTUILIJIHUJIEJINGUANWANGSHIJIYALI(YINGUANBISHIP1-P2≈P1,P2=0)

    RUYIGEDN200KOUJINGDEJIEZHIFAYONGYU10barDEZHENGQIGUANSHANG,QIJINXIANGGUANBIZHOUXIANGDINGTUILIFa=10×πr2=3140kg,ERGUANBISUOXUDESHUIPINGYUANZHOULIYIJIEJINZHENGCHANGRENTISUONENGSHUCHUSHUIPINGYUANZHOULIDEJIXIAN,SUOYIYOUYIGERENZAIZHEIZHONGGONGKUANGXIAWANQUANGUANBICIFASHIFEICHANGKUNNANDE。

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排列3和值走势图    1)GUOLUCHUKOUYIBANYACHABIJIAODA,YINCIZHENGQILIUSUYEGENGDA,DUIMIFENGMIANDECHONGSHIPOHUAIZUOYONGYEJIAODA。LINGWAIGUOLURANSHAOXIAOLVBUKENENGWEI100%,ZHEIYANGJIANGZAOCHENGGUOLUCHUKOUCHUDEZHENGQIHANSHUILIANGJIAODA,RONGYIDUIFAMENMIFENGMIANCHANSHENGKONGHUAHEQISHIDEPOHUAIZUOYONG。

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    3)FENQIGANGJINCHUKOUFAMEN,YINFAHOUZHENGQIYONGLIANGYINSHENGCHANYAOQIUDENGYUANYINERZAOCHENGYONGQILIANGSHIDASHIXIAO,ZAILIUSUBIANHUAJIAODADEQINGKUANGXIA,HENRONGYICHANSHENGSHANZHENG、KONGHUADENGXIANXIANG,CONGERDUIFAMENMIFENGMIANZAOCHENGCHONGSHI、QISHIDENGPOHUAIZUOYONG。

排列3和值走势图    4)YIBANDAGUANJINGGUANXIANKAIQISHI,DOUXUYAODUIGUANXIANJINXINGYURE,ERYUREGUOCHENGYIBANYAOQIUHENXIAOLIULIANGZHENGQITONGGUO,SHIGUANXIANHUANMANJUNYUNJIAREDAOYIDINGCHENGDUHOU,CAINENGWANQUANKAIQIJIEZHIFA,BIMIANZAOCHENGGUANXIANJISUSHENGWENERCHANSHENGGUODUPENGZHANG,SUNHUAIBUFENLIANJIEBUWEI。DANZAIZHEIGUOCHENGZHONG,FAMENKAIDUWANGWANGFEICHANGXIAO,CONGERZAOCHENGCHONGSHILVYUANYUANDAYUZHENGCHANGSHIYONGXIAOGUO,YANZHONGJIANGDIFAMENMIFENGMIANDESHIYONGSHOUMING。

    DAKOUJINGJIEZHIFAKAIGUANKUNNANJIEJUEFANGFA

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                                         SHANGHAIMINGJINGFANGFUFAMENZHIZAOYOUXIANGONGSI

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