阀门选用步骤选用阀门一般应采用以下步骤

阀门选用步骤选用阀门一般应采用以下步骤
选用阀门一般应采用以下步骤。
①明确阀门在装置或工艺管道中的用途，确定阀门的工作状况，例如操作介质、操作
压力、操作温度。
②根据阀门的用途确定阀门的种类，如开闭路阀门、调节类阀门、安全类阀门、其他
类阀门等。
③确定阀门的形式.根据用途及操作工况要求，确定阀门类型为;闸阀、截止阀、球
阀、蝶阀、安全阀、疏水阀、旋塞阀等.
④确定阀门的公称参数。阀门的公称压力、公称直径的确定应与安装的工艺管道相匹
配。一般情况下，’工艺管道在设计时，应用的标准体系（是“大外径系列”还是“小外径系
列，’）是决定压力管路其他元件应用标准的基础.例如，如果选用“小外径系列”的管子应
用标准，它只能与JB法兰或HGJ法兰匹配，而阀门应是JB系列阀门，否则，无法匹配使
用.同理，若使用“大外径系列”管子，它与ANSI, ISO及GB标准相匹配使用，不锈钢人孔，并能与
API阀门匹配使用。阀门一般是安装在工艺管道中，因此其操作工况应随工艺管道的设计选
择相一致，管道的压力等级确定后，阀门的公称压力自然就定下来了.管道采用的标准体系
及管道压力等级确定后，所采用阀门的公称压力、公称直径、不锈钢离心泵，阀门标准就可确定下来。
⑤确定阀门材质。根据工艺管道的介质、工作压力、工作温度确定所选用阀门的壳体
及内部零件的材料:铸铁、铸钢、不锈钢隔膜阀，锻造阀门、合金钢、不锈钢等材料.
⑥确定阀门与管道的连接方式:由操作工况条件确定阀门端面与管道的连接采用法兰、
螺纹或是焊接连接等方式。
⑦利用阀门样本资料，选择合适的阀门产品。
⑧阀门型号确定后，可查出所选阀门的几何参数:结构长度、法兰连接形式及尺寸
（或其他方式连接）、启闭时阀门高度、连接的螺栓孔尺寸及数量、整个阀门的外形尺寸及重
量等，为阀门现场安装打下基础。
1.1. 1
阀门选型举例
原油曦区阀门的选型
原油罐区阀门工况条件主要有:①操作压力较低，一般0- 1.OMPa;②管径比较大，
一般DN<1000mm;③操作温度镇2000;④原油介质不纯净（带悬浮固体颖粒等）。从现
有主流阀型分析，截止阀由于启闭力矩较大，不锈钢人孔，一般其通径DN<250mm;球阀结构复杂，体
积庞大，一般对于DN）500mm的管道，选用球阀是不经济的。因此，目前的罐区阀门大
zui选用闸阀和蝶阀。这两种阀型的主要技术特性对比如下。
①闸阀主要有平板闸阀和楔式闸阀两种，其主要特点有:a.流体阻力小，b.双向性能
好，介质流向不受限制;c.体积庞大，所需安装空间较大;d.启闭行程大，全行程动作时
间长;e.在开启状态下，闸阀导向槽易沉积杂质，导致闸板在关闭时不能严密切断;f.在
启闭过程中，密封面间有机械摩擦，密封面易损坏;9.阀门寿命短.由上述分析可知，闸
阀用于原油罐区，由于原油介质带有悬浮固体顺粒，会引进阀门关闭不严，密封面操作而泄.
 Optional consistent, determined the pressure rating of the pipe, the valve nominal pressure naturally settle down pipe with the standard system
And pipeline pressure rating is determined by the valve nominal pressure, nominal diameter, stainless steel centrifugal pump, valve standard can be finalized.
（5） determine the valve material. According to media process piping, working pressure, working temperature to determine the selection of valve housing
And internal parts of the material: cast iron, cast steel, stainless steel diaphragm valves, forged valves, alloy steel, stainless steel and other materials.
⑥ determine the valve and pipe connections: to be determined by the operating conditions of the valve face and pipeline connection with flange
Threaded or welded connections.
⑦ the use of the the valve sample data, select the appropriate valve products.
⑧ valve models to determine the geometric parameters: the length of the structure of the selected valve flange connection form and dimensions, can be identified
（Or otherwise connected）, open and close the valve height, the connection bolt hole size and quantity, the entire valve Dimensions and weight
The amount for the valve-site installation lay the foundation.
1.1.
Examples of valve selection
Crude oil Xi District valve selection
Crude oil tank valve working conditions: ① operating pressure is low, generally - 1.OMPa; ② diameter relatively large
Generally the DN <1000mm; （3） operating temperature of the town of 2000; ④ crude medium is not pure （with the suspended solid Ying tablets）. From now
Mainstream valve type analysis shutoff valve due to a larger opening and closing moments, stainless steel manhole, general diameter DN <250mm; complex structure ball valve body
Plot large general DN） 500mm pipe, optional ball valve is not economical. Therefore, the tank farm valve
The best selection of gate valves and butterfly valves. Both the main technical characteristics of the type of valve comparison below.
① gate valve mainly flat gate and two wedge gate valve, its main features are: a fluid resistance, b. Bidirectional performance
Good medium flow unrestricted; c. Bulky installation space required; d. Headstock stroke, when the action of the whole trip
Length between; e in the open state, gate guide groove easily deposited impurities, resulting not closely cut off by the shutter when closed; F
Opening and closing process, the sealing surface mechanical friction, easy to damage the sealing surface; 9. Valve short life. Seen from the above analysis, the gate
Valve for crude oil tank, the crude media with suspended solids cis tablets, will be introduced to the valve closed lax the sealing surface operations and vent。