wcjdir 发表于 2006-10-31 17:17:29

截止阀介绍

<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN class=tpctitle1><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><STRONG>截止阀介绍　</STRONG></SPAN></SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">　截止阀的启闭件是塞形的阀瓣，密封面呈平面或锥面，阀瓣沿流体的中心线作直线运动。阀杆的运动形式，有升降杆式（阀杆升降，手轮不升降），也有升降旋转杆式（手轮与阀杆一起旋转升降，螺母设在阀体上）。截止阀只适用于全开和全关，不允许作调节和节流。</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">　　截止阀属于强制密封式阀门，所以在阀门关闭时，必须向阀瓣施加压力，以强制密封面不泄漏。当介质由阀瓣下方进入阀六时，操作力所需要克服的阻力，是阀杆和填料的磨擦力与由介质的压力所产生的推力，关阀门的力比开阀门的力大，所以阀杆的直径要大，否则会发生阀杆顶弯的故障。近年来，从自密封的阀门出现后，截止阀的介质流向就改由阀瓣上方进入阀腔，这时在介质压力作用下，关阀门的力小，而开阀门的力大，阀杆的直径可以相应地减少。同时，在介质作用下，这种形式的阀门也较严密。我国阀门</SPAN></SPAN><SPAN class=tpccontent1><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana">“</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">三化给</SPAN></SPAN><SPAN class=tpccontent1><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana">”</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">曾规定，截止阀的流向，一律采用自上而下。</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">　　截止阀开启时，阀瓣的开启高度，为公称直径的</SPAN></SPAN><SPAN class=tpccontent1><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana">25%</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">～</SPAN></SPAN><SPAN class=tpccontent1><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana">30%</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">时，流量已达到最大，表示阀门已达全开位置。所以截止阀的全开位置，应由阀瓣的行程来决定。</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">截止阀具有以下优点：</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR><SPAN class=tpccontent1>1.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">结构简单，制造和维修比较方便。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>2.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">工作行程小，启闭时间短。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>3.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">密封性好，密封面间磨擦力小，寿命较长。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">截止阀的缺点如下：</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR><SPAN class=tpccontent1>1.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">流体阻力大，开启和关闭时所需力较大。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>2.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">不适用于带颗粒、粘度较大、易结焦的介质。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>3.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">调节性能较差。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">　</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">　截止阀的种类按阀杆螺纹的位置分有外螺纹式、内螺纹式。按介质的流向分，有直通式、直流式和角式。截止阀按密封形式分，有填料密封截止阀和波纹管密封截止阀。</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">截止阀的安装与维护应注意以下事项：</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><BR><SPAN class=tpccontent1>1.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">手轮、手柄操作的截止阀可安装在管道的任何位置上。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>2.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">手轮、手柄及伟动机构，不允许作起吊用。</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"> </SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: Verdana"><BR><SPAN class=tpccontent1>3.</SPAN></SPAN><SPAN class=tpccontent1><SPAN style="FONT-SIZE: 13pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">介质的流向应与阀体所示箭头方向一致。</SPAN></SPAN></P>

铁木三郎 发表于 2012-6-18 15:47:36

麻雀虽小，五脏俱全
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