一、进口液氮截止阀概述

进口液氮截止阀，也叫超低温截止阀，液氮截止阀，液氮低温截止阀，液氮不锈钢截止阀，是指用于低温液体（主要包括液氧、液氮、液氩、液态烃和液化天然气等LO2、LN2、LAR、LNG等）贮运设备的管理系统的截止阀，具有开关灵活、密封可靠的特点，也可用于其他低温和深冷介质的管理系统。

液氮（常写为LN2），是氮气在低温下形成的液体形态。氮的沸点为-196°C，在正常大气压下温度如果在这以下就会形成液氮；在工业中，液态氮是由空气分馏而得。先将空气净化后，在加压、冷却的环境下液化，借由空气中各组分之沸点不同加以分离。氦气最先泄出(且未被液化)，接着就是占空气中78.09%的氮气，再来是占20.95%的氧气，最后是占空气中0.93%的氩气。

美国威盾VTON主要产品有进口液氮截止阀，进口低温短袖截止阀，进口低温长袖截止阀，进口低温不锈钢截止阀，进口低温焊接截止阀，进口低温法兰截止阀，进口LNG低温截止阀，进口液氮截止阀，进口液氧截止阀，进口液化天然气截止阀，进口低温深冷截止阀等。主要用于乙烯，液化天然气装置，天然气LPG LNG储罐，接受基地及卫星站，空分设备，石油化工尾气分离设备，液氧、液氮、液氩、二氧化碳低温贮槽及槽车、变压吸附制氧等装置上。

Liquid nitrogen globe valve, also known as ultra-low temperature globe valve, liquid nitrogen globe valve, liquid nitrogen low-temperature globe valve, and liquid nitrogen stainless steel globe valve, refers to the globe valve used in the management system of low-temperature liquid (mainly including liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbons, and liquefied natural gas, such as LO2, LN2, LAR, LNG, etc.) storage and transportation equipment. It has the characteristics of flexible opening and reliable sealing, and can also be used in the management system of other low-temperature and cryogenic media.

Liquid nitrogen (often written as LN2) is a liquid form of nitrogen formed at low temperatures. The boiling point of nitrogen is -196 ° C, and under normal atmospheric pressure, if the temperature is below this, liquid nitrogen will form; In industry, liquid nitrogen is obtained by air distillation. After purifying the air, it liquefies under pressure and cooling, and is separated by the different boiling points of each component in the air. Helium gas is first released (and not liquefied), followed by nitrogen gas accounting for 78.09% of the air, followed by oxygen gas accounting for 20.95%, and finally argon gas accounting for 0.93% of the air.

VTON's main products include liquid nitrogen globe valves, low-temperature short sleeved globe valves, low-temperature long sleeved globe valves, low-temperature stainless steel globe valves, low-temperature welding globe valves, low-temperature flange globe valves, LNG low-temperature globe valves, liquid nitrogen globe valves, liquid oxygen globe valves, liquefied natural gas globe valves, low-temperature deep cooling globe valves, etc. Mainly used in ethylene, liquefied natural gas equipment, natural gas LPG LNG storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, low-temperature storage tanks and tankers for liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide, and pressure swing adsorption oxygen production equipment.

二、进口液氮截止阀参数

三、进口液氮截止阀尺寸图