各位汽机专业大侠请进，我厂密封油主差压阀抖动，请问是什么原因？

<p><font size="4">我厂是2x300MW机组，发电机采用<span lang="EN-US" style="FONT-SIZE: 18pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong>YKG-300-2密封油系统，这几天机组检修完刚起来，今天中午在没有进行任何操作的情况下，CRT上显示氢油差压突然到0，空氢侧直流油泵联动，就地检查是发现空侧油压在0.1Mpa-0.6Mpa之间波动，主差压阀平凡动作，管道震动十分严重，关闭主差压阀信号门时停止摆动，在投运主差压阀后恢复正常，请各位大侠分析一下是什么原因？如何处理？谢谢！ </strong></span></font></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center;"><b><span style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: &quot;Times New Roman&quot;;"><font size="1"></font></span></b></p>