進(jìn)口LNG液化天然氣止回閥選德國(guó)洛克專(zhuān)業(yè)生產(chǎn)質(zhì)量放心

一、進(jìn)口LNG液化天然氣止回閥結(jié)構(gòu)特點(diǎn)：

1、經(jīng)過(guò)低溫深冷處理，能耐-196℃低溫

2、閥瓣材料經(jīng)過(guò)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。

3、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。

4、采用優(yōu)質(zhì)的德國(guó)LOCKE洛克各種零部件材料，能達(dá)到流體逆向零泄露，防止倒流。

1. After cryogenic treatment, it can withstand - 196 ℃ low temperature

2. After chromium plating or nitriding treatment, the surface hardness of valve stem is improved and the reliability of packing seal is improved.

3. The gasket can be reliably sealed and recovered under normal temperature, low temperature and temperature change.

4. Using high quality German locke parts materials, it can achieve reverse zero leakage of fluid and prevent backflow.

二、進(jìn)口LNG液化天然氣止回閥安裝與維護(hù)：

1,本閥門(mén)通路兩端須堵塞，存在干燥通風(fēng)的室內(nèi)。如長(zhǎng)期存放，應(yīng)經(jīng)常檢查防銹蝕。

2,安裝前應(yīng)將閥門(mén)清洗干凈，并消除在運(yùn)輸過(guò)程中造成的缺陷。

3,安裝時(shí)必須仔細(xì)核對(duì)閥門(mén)上的標(biāo)志和銘牌是否符合使用要求。

4,升降式垂直瓣止回閥應(yīng)安裝在垂直管道上。

5,升降式水平瓣止回閥應(yīng)安裝在水平管道上。

6,在管線中不要使止回閥承受重量，大型的止回閥應(yīng)獨(dú)立支撐，使之不受管系產(chǎn)生的壓力的影響。

7,安裝止回閥時(shí)，應(yīng)特別注意介質(zhì)流動(dòng)方向，應(yīng)使介質(zhì)正常流動(dòng)方向與閥體上指示的箭頭方向相一致，否則就會(huì)截?cái)嘟橘|(zhì)的正常流動(dòng)。底閥應(yīng)安裝在水泵吸水管路的底端。

8,通式升降式止回閥應(yīng)安裝于水平管路上,立式升降式止回閥和底閥一般安裝在垂直管路上,并且介質(zhì)自下而上流動(dòng)。

9,止回閥關(guān)閉時(shí)，會(huì)在管路中產(chǎn)生水錘壓力，嚴(yán)重時(shí)會(huì)導(dǎo)致閥門(mén)、管路或設(shè)備的損壞，尤其對(duì)于大口管路或高壓管路，故應(yīng)引起止回閥選用者的高度注意。

1. Both ends of the valve passage must be blocked, and there is a dry and ventilated room. If it is stored for a long time, it should be checked for rust.

2. The valve should be cleaned before installation, and the defects caused during transportation should be eliminated.

3. Carefully check whether the signs and nameplates on the valve meet the use requirements during installation.

4. Lift type vertical disc check valve shall be installed on vertical pipe.

5. Lift type horizontal disc check valve shall be installed on horizontal pipeline.

6. Do not make the check valve bear the weight in the pipeline. The large check valve should be independently supported to prevent it from being affected by the pressure generated by the pipeline system.

7. When installing the check valve, special attention should be paid to the flow direction of the medium. The normal flow direction of the medium should be consistent with the arrow direction indicated on the valve body, otherwise the normal flow of the medium will be cut off. The bottom valve should be installed at the bottom of the water pump suction pipe.

8. The general lifting check valve shall be installed on the horizontal pipeline, while the vertical lifting check valve and bottom valve are generally installed on the vertical pipeline, and the medium flows from bottom to top.

9. When the check valve is closed, there will be water hammer pressure in the pipeline, which will cause damage to the valve, pipeline or equipment in serious cases, especially for the large opening pipeline or high pressure pipeline, so it should be paid great attention by the check valve selector.

三、進(jìn)口LNG液化天然氣止回閥產(chǎn)品簡(jiǎn)介：

德國(guó)LOCKE洛克進(jìn)口LNG液化天然氣止回閥又稱(chēng)低溫逆止閥、低溫單向閥、低溫逆流閥、和低溫背壓閥，是指采用經(jīng)過(guò)低溫深冷的不銹鋼材質(zhì)，在低溫貯槽上或者低溫管道系統(tǒng)，依靠介質(zhì)本身流動(dòng)而自動(dòng)開(kāi)、閉閥瓣，防止低溫介質(zhì)液氧，液氮，液氬，液化天然氣，LO2、LN2、LAR、LNG等倒流的閥門(mén)，

LNG是英語(yǔ)液化天然氣（liquefied natural gas）的縮寫(xiě)。主要成分是甲烷。LNG無(wú)色、無(wú)味、無(wú)毒且無(wú)腐蝕性，其體積約為同量氣態(tài)天然氣體積的1/600，LNG的重量?jī)H為同體積水的45%左右，熱值為52MMBtu/t（1MMBtu=2.52×10^8cal）。LNG是通過(guò)在常壓下氣態(tài)的天然氣冷卻至-162℃，使之凝結(jié)成液體。天然氣液化后可以大大節(jié)約儲(chǔ)運(yùn)空間，而且具有熱值大、性能高等特點(diǎn)。

德國(guó)LOCKE洛克低溫止回閥結(jié)構(gòu)緊湊、體積小、重量輕，防止倒流零泄露，穩(wěn)定性好。

LNG liquefied natural gas check valve imported from Germany Locke, also known as low-temperature check valve, low-temperature check valve, low-temperature reverse flow valve and low-temperature back pressure valve, refers to the use of low-temperature and deep-cooled stainless steel material, on the low-temperature storage tank or low-temperature pipeline system, depending on the flow of the medium itself to automatically open and close the valve disc, to prevent low-temperature medium, liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, LO2, LN 2. Reverse flow valves such as LAR, LNG, etc,

LNG is the abbreviation of liquefied natural gas in English. The main component is methane. LNG is colorless, odorless, nontoxic and non corrosive. Its volume is about 1 / 600 of the same volume of gaseous natural gas. The weight of LNG is only about 45% of the volume of water in the same body. The calorific value of LNG is 52mmbtu / T (1mmbtu = 2.52 × 10 ^ 8cal). LNG is condensed into liquid by cooling natural gas in gaseous state to - 162 ℃ under normal pressure. Natural gas liquefaction can greatly save storage and transportation space, and has the characteristics of high calorific value and high performance.

German locke low temperature check valve has the advantages of compact structure, small volume and light weight, which can prevent backflow and zero leakage, and has good stability.