<p> 阀门口径的大小,是根据CV值或KV(kvs)来确定的,计算公式为:CV=0.7Q/ √ <font face="Verdana">△</font>P;其中,Q的单位是升/分钟,<font face="Verdana">△</font>P的单位是kpa,<font face="Verdana">△</font>P=P1-P2,据此可知,若要计算 需要知道阀门一次侧(阀前)压力P1,二次侧(阀后)压力P2,流量。通常情况下,一次侧压力P1是可测的,但是p2很难测量,是一个变动值。各个厂家都是根据自己的经验值,给出<font face="Verdana">△</font>P的值,厂家不同,<font face="Verdana">△</font>P的取值范围也不同。 <span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">Cv=1.167Kv</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">,<i style="mso-bidi-font-style: normal">而<span lang="EN-US">Kv</span>和<span lang="EN-US">Kvs</span>是相当的</i>。</span></p>
<p><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> 如果不知道流量、压力等参数,只是知道配管的口径(设计合理情况下),此种情况下,一般是选择比管径小一档的口径的阀门。</span></p>
<p><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span></p>
<p><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></span> </p>
<p><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span></p> |