進(jìn)口低溫液氮球閥外觀精美質(zhì)量耐用德國洛克

一、進(jìn)口低溫液氮球閥產(chǎn)品簡介：

德國洛克進(jìn)口低溫液氮球閥，也叫液態(tài)氮?dú)馇蜷y，液氮不銹鋼球閥，液氮低溫球閥，是指采用法蘭的連接方式，指主要用于乙烯，液化天然氣裝置，天然氣LPG LNG儲(chǔ)罐，接受基地及衛(wèi)星站，空分設(shè)備，石油化工尾氣分離設(shè)備，液氧、液氮、液氬、二氧化碳低溫貯槽及槽車、變壓吸附制氧等裝置上，用來對(duì)低溫介質(zhì)進(jìn)行開啟和關(guān)閉的閥門。

液氮（常寫為LN2），是氮?dú)庠诘蜏叵滦纬傻囊后w形態(tài)。氮的沸點(diǎn)為-196°C，在正常大氣壓下溫度如果在這以下就會(huì)形成液氮；在工業(yè)中，液態(tài)氮是由空氣分餾而得。先將空氣凈化后，在加壓、冷卻的環(huán)境下液化，借由空氣中各組分之沸點(diǎn)不同加以分離。氦氣最先泄出(且未被液化)，接著就是占空氣中78.09%的氮?dú)?，再來是?/font>20.95%的氧氣，最后是占空氣中0.93%的氬氣。

Low temperature liquid nitrogen ball valve imported from Germany, also known as liquid nitrogen ball valve, liquid nitrogen stainless steel ball valve, liquid nitrogen low temperature ball valve, refers to the flange connection method, which is mainly used for ethylene, liquefied natural gas device, natural gas LPG Valves used to open and close low temperature medium on LNG storage tank, receiving base and satellite station, air separation equipment, petrochemical tail gas separation equipment, low temperature storage tank of liquid oxygen, liquid nitrogen, liquid argon and carbon dioxide, tank car, pressure swing adsorption oxygen production device, etc.

Liquid nitrogen (usually written as LN2) is the liquid form of nitrogen formed at low temperature. The boiling point of nitrogen is - 196 ° C. under normal atmospheric pressure, if the temperature is below this, liquid nitrogen will be formed; in industry, liquid nitrogen is obtained by fractional distillation of air. The air is first purified and then liquefied in a pressurized and cooled environment, and separated by the different boiling points of each component in the air. Helium was first released (and not liquefied), followed by nitrogen (78.09%), oxygen (20.95%), and argon (0.93%).

二、進(jìn)口低溫液氮球閥結(jié)構(gòu)特點(diǎn)：

1.承壓件的材料能承受介質(zhì)溫度的變化而引起的膨脹、收縮、密封部位的結(jié)構(gòu)在溫度變化時(shí)不會(huì)產(chǎn)生永久的變形。用于-100℃以下工況時(shí)，閥門零件在精加工前應(yīng)進(jìn)行深冷處理，即將零件浸放在液氮箱中進(jìn)行冷卻，當(dāng)零件溫度達(dá)到-192℃時(shí)，開始保溫1-2h，然后取出箱外自然處理到常溫，重溫循環(huán)2次。

2、閥蓋采用長勁結(jié)構(gòu)，其目的保護(hù)填料函的功能，使填料函處于離低溫較遠(yuǎn)的位置，保證填料的密封效果，同時(shí)還可以纏繞保冷材料，防止冷能損失。長頸的頸長可根據(jù)使用溫度和保冷材料的厚度來選擇不同的長度。當(dāng)填料密封效果降低時(shí)，可以從填料函中間加入潤滑脂形成油封層，降低填料函的壓差，提高密封性能。

3、使用溫度低于-100℃時(shí)，閥桿材料經(jīng)過鍍鉻或氮化處理，提高閥桿表面硬度，提高填料密封的可靠性。

4、低溫球閥具有防止異常升壓結(jié)構(gòu)，由于低溫閥門介質(zhì)氣化后，其體積急劇膨脹，壓力會(huì)異常升高，當(dāng)閥門中腔壓力升高時(shí)，閥門中腔和進(jìn)口連通，或在閥門進(jìn)口端安置泄壓閥，保證閥門安全使用。

5、低溫球閥用的墊片具有在常溫下、低溫狀態(tài)及溫度變化下能可靠密封性和復(fù)原性。

1. The material of pressure bearing parts can withstand the expansion, contraction and sealing structure caused by the change of medium temperature, and the structure of sealing parts will not produce permanent deformation when the temperature changes. When the valve parts are used under the working condition below - 100 ℃, the valve parts shall be subject to cryogenic treatment before finishing, that is, the parts shall be immersed in liquid nitrogen tank for cooling. When the temperature of the parts reaches - 192 ℃, the valve parts shall be kept for 1-2 h, and then the outside of the box shall be taken out for natural treatment to normal temperature, and then the valve parts shall be reheated for 2 times.

2. The valve cover adopts a long stiffened structure, which aims to protect the function of the stuffing box and keep the stuffing box far away from the low temperature to ensure the sealing effect of the packing. At the same time, it can also wrap the cold insulation material to prevent the loss of cold energy. The length of the long neck can be selected according to the temperature and the thickness of the cold insulation material. When the packing sealing effect decreases, grease can be added from the middle of the stuffing box to form an oil seal layer, which can reduce the differential pressure of the stuffing box and improve the sealing performance.

3. When the service temperature is lower than - 100 ℃, the valve stem material is treated by chromium plating or nitriding, which can improve the surface hardness of the valve stem and improve the reliability of the packing seal.

4. Low temperature ball valve has a structure to prevent abnormal pressure rise. Since the volume of cryogenic valve expands rapidly after medium gasification, the pressure will increase abnormally. When the pressure in the middle chamber of the valve rises, the middle chamber of the valve is connected with the inlet, or a pressure relief valve is installed at the inlet end of the valve to ensure the safe use of the valve.

5. The gasket used for low temperature ball valve has reliable sealing and recovery under normal temperature, low temperature state and temperature change.

三、進(jìn)口低溫液氮球閥規(guī)格參數(shù)：

Specification range: DN 10-dn200

Temperature range - 196 ℃～ 150 ℃

Pressure range: pn1.6-pn10mpa

Valve body material: Cryogenic Steel

Valve stem material: Cryogenic Steel

Valve cover material: Cryogenic Steel

Valve seat material: Cryogenic Steel

Stem form: short shaft and extended rod

Application range: liquid nitrogen and industrial low temperature liquid.

Connection mode: German standard / national standard / American Standard, flange, welding, internal thread

Optional: fire safety design, antistatic

Suitable medium: helium, hydrogen, nitrogen, argon, oxygen, methane, carbon dioxide, liquefied natural gas

It is widely used in air separation equipment, LNG storage and transportation, aviation, petrochemical products and pharmaceutical industries.