型閥的特點與作用：
針型閥:是儀表測量管路系統(tǒng)中重要組成部分，主要有截止閥和球閥，其功用是作開啟或切斷管道通路用。針型閥具有安裝拆卸方便、連接緊固、有利于防火 、防爆和耐壓能力高、密封性能良好等優(yōu)點，是電站、煉油、化工裝置和儀表測 量管路中的一種*連接方式的閥門。針型閥的密封性良好，使用壽命長，即使密封面損壞后，也只需要更換易損零件，即可繼續(xù)使用。安裝針型閥時應(yīng)使介質(zhì) 的流向與閥體上的箭頭方向*。手動截止閥、球閥可安裝在管路的任何位置上 。針型閥是一種可以精確調(diào)整的閥門用途較廣，比如火焰切割用的割距，調(diào)整火焰溫度的旋鈕就是針型閥，儀表針型閥是儀表測量管路系統(tǒng)中重要組成部分，主 要有截止閥和球閥，其功用是作開啟或切斷管道通路用。任何閥門的作用都是為 了切斷流體.根據(jù)閥芯的不同,可以分為截止閥,閘板閥,旋塞閥,球閥,碟形閥,針 型閥等等.針型閥的閥芯就是一個很尖的圓錐體,好象針一樣插入閥座,由此得名. 針型閥形比其他類型的閥門能夠耐受更大的壓力,密封性能好,所以一般用于較小 流量,較高壓力的氣體或者液體介質(zhì)的密封.針型閥形與壓力表配合使用是zui合適 的了.一般的針型閥形都做成螺紋連接.

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以下是參考譯文：

譯文：
Needle valve type, is an important part of the meter in the piping system, mainly cut-off valve and ball valve, its function is used as open or cut off the pipeline path. Type needle valve with easy installation and disassembly, fastening connections, is conducive to fire, explosion, and the advantages of high compression capacity, sealed performance is good, is power stations, oil refining, chemical industry and instrument measuring line of an advanced connection mode of the valve. Needle valve sealing good, long service life, even if the sealing surface damage, also need to replace quick-wear part only, can continue to use. When installing type needle valve should make the flow of medium and the direction of arrow on valve body. Manual stop valve, ball valve can be installed in any position on line. Type needle valve is a valve can be precisely adjusted use widely, such as flame cutting with the cutting distance, the flame temperature adjustment knob is the needle valve, instrument type needle valve is an important part of the meter in the piping system, mainly cut-off valve and ball valve, its function is used as open or cut off the pipeline path. The effect of any valve for cutting fluid. Depending on the valve core, can be divided into cut-off valve, gate valve, plug valve, ball valve, the disc valve, needle valve, etc. Type needle valve valve core is a very sharp cone, like the needle inserted into the seat, hence the name. Type needle valve type than any other type of valve that can tolerate more pressure, sealed performance is good, so generally used for small flow, high pressure gas or liquid medium sealing. Type needle valve and pressure gauge is used the most appropriate. General type needle valve type screw thread connection.

針型閥選型適用原則

1、石油、天然氣的輸送主管線、需要清掃管線的，又需埋設(shè)在 地下的，選用全通徑、全焊接結(jié)構(gòu)的針型閥；埋設(shè)在地上的，選擇全通徑焊接連接或法蘭連接的球閥。
2、成品油的輸送管線和貯存設(shè)備，選用法蘭連接的針型閥。
3、城市煤氣和天然氣的管路上，選用法蘭連接和內(nèi)螺紋連接的 針型閥。
4、冶金系統(tǒng)中的氧氣管路系統(tǒng)中，宜選用經(jīng)過嚴(yán)格脫脂處理， 法蘭連接的針型閥。
5、低溫介質(zhì)的管路系統(tǒng)和裝置上，宜選用加上閥蓋的低溫針型 閥。
6、煉油裝置的催化裂化裝置的管路系統(tǒng)上，可選用升降桿式針 型閥。
7、化工系統(tǒng)的酸堿等腐蝕性介質(zhì)的裝置和管路系統(tǒng)中，宜選用 奧氏體不銹鋼制造的、聚四氟乙烯為閥座密封圈的全不銹鋼針型 閥。
8、冶金系統(tǒng)、電力系統(tǒng)、石化裝置、城市供熱系統(tǒng)中的高溫介 質(zhì)的管路系統(tǒng)或裝置上，可選用金屬對金屬密封針型閥。
9、需要進(jìn)行流量調(diào)節(jié)時，可選用蝸輪蝸桿傳動的、氣動或電動 的帶V形開口的調(diào)節(jié)針型閥。
針型閥選型適用原則。

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以下是參考譯文：

譯文：
1、Oil, natural gas transportation director line, need cleaning the pipeline, and to be buried in the ground, with full size, full welded structure type needle valve; Buried in the ground, choose the full size welded ball valve connection or flange connection.
2、Product oil pipeline and storage equipment, choose the type needle valve with flange connection.
3、City gas and natural gas pipelines, selection of flange connection and female connection type needle valve.
4、In the oxygen in the pipeline system, metallurgy system, appropriate chooses strict degreasing process, flange connection type needle valve.
5、The pipeline system and device of medium to low temperature, appropriate chooses combined with low temperature type needle valve bonnet.
6、 Refining unit of catalytic cracking unit of piping system, can choose lifting lever type needle valve.
7、The chemical industry system in acid and alkali corrosive medium, such as equipment and piping system, appropriate chooses of austenitic stainless steel and ptfe seat sealing type stainless steel needle valve.
8、Metallurgy system, power system, petrochemical plant, city heating system in high temperature medium pipeline system or device, can choose a metal to metal seal type needle valve.
9、The need for flow control, can choose the worm gear and worm drive, pneumatic or electric type with v-shaped opening adjust needle valve. Needle valve type selection principles.