无码人妻21p_国产成人av在线_97五月天免费视频观看_日本在线a片一区视频_久久亚洲a_日韩啪啪免费视频

Hello, welcome to the Jiangsu Ideal Valve Co., Ltd. official website!
TEL:+86-515-87214888      EMAIL:fnjslxfy@163.com      

Material comparison of several commonly used rubber sealing rings for valves

Time:2020-05-29
What are the sealing rings made of? What are the characteristics?

Seal ring refers to the ring cover composed of one or several parts, which is fixed on one ring or washer of the bearing and contacts with another ring or washer or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the invasion of foreign matters. Because its section is O- shaped, it is called O-shaped seal ring. What are the sealing rings made of? What are the characteristics?


1、 NBR nitrile rubber sealing ring

It is suitable for use in petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicon grease, silicon oil and other media. It is the most widely used and lowest cost rubber seal at present. Not suitable for polar solvents such as ketones, ozone, nitrohydrocarbons, MEK and chloroform. Generally, the temperature range is - 40 ~ 120 ℃.


2、 HNBR hydrogenated NBR sealing ring

It has excellent corrosion resistance, tear resistance, compression deformation resistance, ozone resistance, sunlight resistance and weather resistance. It has better wear resistance than NBR. It is suitable for washing machine and automobile engine system. It is not recommended to use in alcohol, ester or aromatic solution. Generally, the temperature range is - 40 ~ 150 ℃.


3、SIL sealing ring

It has excellent heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. It has good insulation performance. However, the tensile strength of rubber is worse than that of general rubber and does not have oil resistance. It is suitable for household appliances such as electric water heater, electric iron, microwave oven, etc. It is also suitable for all kinds of articles in contact with human body, such as water bottles, drinking fountains, etc. It is not recommended to be used in most concentrated solvents, oil products, concentrated acids and sodium hydroxide. Generally, the temperature range is - 55 ~ 250 ℃.


4、 Viton fluororubber sealing ring

High temperature resistance is better than silicone rubber, with excellent weather resistance, ozone resistance and chemical resistance, and poor cold resistance. It is resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons, animal and vegetable oils. It is suitable for sealing requirements of diesel engine, fuel system and chemical plant. It is not recommended to use in ketones, low molecular weight esters and mixtures containing nitrate. Generally, the temperature range is - 20 ~ 250 ℃.


5、 FLS fluorosilicone rubber sealing ring

Its performance has the advantages of both fluororubber and silicone rubber. It has good oil resistance, solvent resistance, fuel oil resistance and high and low temperature resistance. It can resist the attack of oxygenated compounds, aromatic solvents and chlorinated solvents. Generally, the temperature range is - 50 ~ 200 ℃.


6、 EPDM EPDM EPDM sealing ring

It has good weather resistance, ozone resistance, water resistance and chemical resistance. It can be used for alcohols and ketones, and also for sealing in high temperature steam environment. Generally, the temperature range is - 55 ~ 150 ℃.


7、 CR neoprene sealing ring

It has excellent sunlight and weather resistance. It is not afraid of refrigerants such as dichlorodifluoromethane and ammonia. It is resistant to dilute acid and silicone grease lubricating oil, but it has a large expansion in mineral oil with low aniline point. It is easy to crystallize and harden at low temperature. It is suitable for all kinds of environments contacting with atmosphere, sunlight and ozone, as well as all kinds of fire-resistant and chemical corrosion-resistant sealing links. It is not recommended to use in strong acid, nitrohydrocarbon, ester, chloroform and ketone chemicals. Generally, the temperature range is - 55 ~ 120 ℃.


8、 IIR butyl rubber sealing ring

It has good air tightness, heat resistance, sunlight resistance, ozone resistance and insulation performance; it has good resistance to polar solvents such as alcohol, ketone, ester, etc., and can be exposed to animal and vegetable oil or oxide. Suitable for chemical resistant or vacuum equipment. It is not recommended to use with petroleum solvents, kerosene or aromatics. Generally, the temperature range is - 50 ~ 110 ℃.


9、 ACM acrylic rubber sealing ring

It has excellent resistance to oil products, high temperature and weather resistance, but mechanical strength, compression deformation rate and water resistance are slightly poor. Generally used in automobile transmission system and power steering system. Not suitable for hot water, brake oil, phosphate. Generally, the temperature range is - 25 ~ 170 ℃.


10、 NR natural rubber sealing ring

Rubber products have good wear resistance, elasticity, breaking strength and elongation. However, it is easy to age in the air and become sticky in case of heat. It is easy to expand and dissolve in mineral oil or gasoline. It is alkali resistant but not acid resistant. It is suitable for use in automobile brake oil, ethanol and other liquid with hydrogen peroxide ion. Generally, the temperature range is - 20 ~ 100 ℃.


11、 PU polyurethane rubber sealing ring

Polyurethane rubber has very good mechanical properties, and its wear resistance and high pressure resistance are far superior to other rubbers. It has good aging resistance, ozone resistance and oil resistance, but it is easy to hydrolyze at high temperature. Generally used for high pressure, wear- resistant sealing link. Generally, the temperature range is - 45 ~ 90 ℃.



主站蜘蛛池模板: 91快看| 今天高清视频在线观看视频 | 国产成人精品小视频 | 青草青免费视频 | 久久久久高清毛片一级 | 亚洲精品一 | 69久久国产露脸精品国产 | 国内av一区二区三区 | 麻豆国产一区二区三区 | 久草在线手机观看 | 奇米精品一区二区三区在线观看 | 女人体1963毛片a级 | 欧美疯狂xxxxbbbb动态图 | 91麻豆国产自产在线观看 | 国产人久久人人人人爽 | 日韩久久久精品 | 亚洲综合视频网 | 影音先锋在线中文字幕 | 欧美福利视频一区二区三区 | a中文视频| 奇米成人| 久久不卡国产精品一区二区 | 蝌蚪777| 日本欧美国产在线 | 久久久国产精品福利片 | 日韩在线三级 | 国产在线精品一区二区在线播放 | 国产精品第页 | 91社区国产在线观看 | 欧美日韩一区二区三区在线视频 | 久久亚洲综合国产精品99麻豆的功能介绍 | 欧美精品黄色 | 精品日韩av高清一区二区三区 | 91国产在线视频在线 | 亚洲性福利 | av在线三区 | 色婷婷综合久久久久中文一区二区 | 久久福利精品 | a国产亚洲欧美精品一区在线观看 | 日韩二区三区四区 | 成人久久网|