<p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">如何解决<strong>电动调节阀</strong>外泄的问题</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　<span>1)</span><span>增加密封油脂法</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　对未使用密封油脂的电动调节阀，可考虑增加密封油脂来提高阀杆密封性能。</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　<span>2)</span><span>增加填料法</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　为提高填料对阀杆的密封性能，可采用增加填料的方法。通常是采用双层、多层混合填料形式，单纯增加数量，如将<span>3</span><span>片增到</span><span>5</span><span>片，效果并不明显。</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　<span>3)</span><span>更换石墨填料法</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　大量使用的四氟填料，因其工作温度在<span>-20</span><span>～</span><span>200℃</span><span>范围内，当温度在上、下限，变化较大时，其密封性便明显下降，老化快，寿命短。柔性石墨填料可克服这些缺点且使用寿命长。因而有的工厂全部将四氟填料改为石墨填料，甚至新购回的调节阀也将其中的四氟填料换成石墨填料后使用。但使用石墨填料的回差大，初时有的还产生爬行现象，对此必须有所考虑。</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　<span>4)</span><span>改变流向，置</span><span>P2</span><span>在阀杆端法</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　当<span>△P</span><span>较大</span><span>,P1</span><span>又较大时</span><span>,</span><span>密封</span><span>P1</span><span>显然比密封</span><span>P2</span><span>困难</span><span>.</span><span>因此</span><span>,</span><span>可采取改变流向的方法</span><span>,</span><span>将</span><span>P1</span><span>在阀杆端改为</span><span>P2</span><span>在阀杆端</span><span>,</span><span>这对压力高、压差大的阀是较有效的</span><span>.</span><span>如波纹管阀就通常应考虑密封</span><span>P2</span><span>。</span></span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　</span><span style="font-family:'Times New Roman';font-size:10.5pt;"></span> </p> <p class="p0"> <span style="font-family:'Times New Roman';font-size:10.5pt;">　　<span>5)</span><span>采用透镜垫密封法</span></span> </p>