球阀中法兰凹槽深度对垫片密封性能的影响  

Effect of depth of middle flange groove of ball valve on gasket sealing performance

作　　者：秦龙 张鹏奇 郝娇山 刘平 李宏伟 陈林 QIN Long;ZHANG Pengqi;HAO Jiaoshan;LIU Ping;LI Hongwei;CHEN Lin(Chongqing Chuanyi Control Valve Co.,Ltd.,Chongqing 400700,China;Bishan High-tech Zone Modern Industrial Development Promotion Center,Chongqing 402760)

机构地区：[1]重庆川仪调节阀有限公司,重庆400700 [2]璧山高新区现代工业发展促进中心,重庆402760

出　　处：《流体机械》2023年第11期9-14,28,共7页Fluid Machinery

基　　金：国家科技重大专项(2019ZX06002026-005-002)。

摘　　要：为了研究球阀中法兰凹槽深度对垫片密封性能的影响,选择3种口径(DN25,DN80,DN150)、3个压强(2.2,5.5,11.0 MPa)下的两种金属缠绕垫片为研究对象,根据垫片密封理论,计算了垫片保持密封需要的螺栓最小预紧力矩,对两种金属缠绕垫片进行密封性能试验,得到了压强在2.2~11.0 MPa时,3种口径垫片的最佳密封厚度,绘制了DN25~DN150口径垫片对应的最佳密封厚度曲线图。结果表明:采用螺栓最小预紧力矩,球阀中法兰凹槽选择合理深度,垫片可以达到密封效果;当球阀设计压强在2.0~10.0 MPa时,建议3个口径DN25,DN80,DN150球阀中法兰凹槽深度依次设计为2.6,2.4,2.0 mm;在相同口径、垫片压缩厚度和介质压强下,四氟缠绕垫片的密封性能优于石墨缠绕垫片,随着介质压强或垫片口径的增大,垫片最佳密封厚度逐渐减小,但并非厚度越小垫片密封性能越好。研究结果对中法兰凹槽深度设计有一定的参考价值。In order to study the effect of flange groove depth on sealing performance of gasket in ball valve,two kinds of metal wound gaskets under three diameters(DN25,DN80,DN150)and three pressures(2.2,5.5,11.0 MPa)were selected as research objects.According to the gasket sealing theory,the minimum pre-tightening torque of bolts required by gaskets to maintain sealing was calculated,and the sealing performance of two kinds of metal wound gaskets was tested,and the optimal sealing thickness of gaskets of three kinds of diameter was obtained when the pressure was 2.2~11.0 MPa,and the optimal sealing thickness curve of DN25~DN150 diameter gaskets was plotted.The results show that the sealing effect of gasket can be achieved by adopting the minimum pre-tightening torque of bolt and selecting reasonable depth of flange groove in ball valve.When the design pressure of the ball valve is 2.0~10.0 MPa,it is recommended that the depth of the flange groove of the three diameters of DN25,DN80,DN150 ball valves is 2.6,2.4,2.0 mm,respectively.The sealing performance of the PTFE wound gasket used in the flange of ball valve is better than that of the graphite wound gasket under the same diameter,compression thickness and medium pressure.With the increase of medium pressure or gasket diameter,the optimal sealing thickness of gasket decreases gradually,but the sealing performance of gasket is not better with decreasing thickness.The research results have some reference value for the design of middle flange groove depth.

关 键 词：球阀中法兰 凹槽深度 垫片 密封厚度 

分 类 号：TH138[机械工程—机械制造及自动化] TB42[一般工业技术]