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[资料] 球阀阀体的选择:侧装,南国彩票论坛社区:顶装,还是焊接 Body Type of Ball Valves
[ 2013/12/22 17:48:57 | By: InstrEng.com ]
 

侧装式球阀是指组装时球阀从侧面进入。它通常由两部分或三部分连接组成。阀体的每个部分类似法兰连接螺栓来装配。通常侧装式球阀是由锻造金属制成。每一块阀体是锻造的,然后组装在一起。这种结构将减少铸造阀门所造成缺陷。侧装式球阀也易于组装和装配部件也容易对准。侧装式的另一个优点是其几乎所有的供应商都生产,无需铸造件额外的测试,交货期也相对快一些。侧装式球形阀是最常用的球阀类型,一般会在数据表中作为默认选项。

Side entry ball valves are valves that assembled its ball from the side part. It usually assembled in two pieces or three pieces body. Each part of the body is assembled by a bolt/stud just like joining a two piece of flanges. Usually side entry ball valves are made from forge metal. Each piece of body are forged and then assembled together. This construction will minimize a defect that causing from a casting valves. Side entry ball valves are also easy to assemble and the trim component are also easy to align. Another advantage of the side entry type is its fast delivery time from almost all vendors rather than a casting product that still needs some additional test. Side entry ball valves are the most used ball valve types and should be the default choice to specify a ball valve type at data sheet.

顶装式球阀是球体从顶部装入,安装时和截止阀类似,用阀体和法盖连接起来,只是内件是球体。进行生产维护时,只需拆开顶部的螺栓把球体从顶部取出来。顶装式只有一个阀体,一般铸造而成,需要进行NDE检测以保证铸造过程无缺陷。顶装式球阀一般用于对于停车要求高需要尽可能短车时间的场合,因此一般常见于HIPPS场合。顶装式球阀的另一个优点是因连接点少而减少了可能泄露的路径。

Top entry ball valves are valves that assembled its ball from top side part. It just like a globe valve that has body and bonnet except the trim part utilize a ball type. It comprises a one single body. Usually top entry ball valves are made from casting metal. Since it made from casting it will need some additional NDE test to make sure that there is no defect from the casting process. The top entry ball valves usually used at an application that require a minimal disassembly for in-line maintenances of its internal parts. Therefore it’s very common to use top entry ball valves at high pressure application that require in-frequent maintenances such as HIPPS (High Integrity Pressure Protection System) valves etc. The advantages of the top entry ball valves is its construction that allow minimal thread connection so that it will also minimize possible leak path.

焊接式球阀是完全焊接而没有螺栓连接的泄漏点。一般不能在现场进行维修。这种焊接式球阀一般用于地下或埋地无需维修的场合,如长输管线、海底等。

Welded body ball valves are valves that assembled in completely welded so that there are no leak paths through bolt connection etc. It’s not possible to do maintenance for the valve in the field. This welded body ball valves usually used at underground or buried application where maintenance is not expected such as gas transmission, subsea application etc.

Side entry ball valve

Top Entry ball valve

Welded body ball valve

Read more: http://www.eyflu.com.cn//side-entry-top-entry-and-welded-body-ball-valves/

 
 

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