The application of sealing ring seals and how to choose the material of sealing rings?

Sealing ring is a kind of seal, and the selection of sealing ring material is of great significance to its sealing performance and service life. The general sealing ring can achieve a good sealing effect under a certain high temperature and high pressure. Moreover, the sealing ring has the advantages of simple structure, easy to use and maintain, strong corrosion ability, not easy to age, long working life and wear resistance.

The sealing ring is generally divided into nitrile rubber sealing ring, natural rubber sealing ring, neoprene rubber sealing ring, EPDM rubber sealing ring, hydrogenated nitrile rubber sealing ring, silicone rubber sealing ring, fluorine rubber sealing ring, silicone fluorine rubber sealing ring, etc., which is the most important and effective means to solve the leakage problem of hydraulic system. He is generally used in HVAC, fire protection, pharmaceutical, marine, and other plumbing systems, automobiles, motorcycles, and various mechanical equipment.

When installing and using the seal, do not force the installation and do not use the seal for an extended period of time. Before installation, check the size of the sealing ring, which has the same characteristics as PTFE seals, and apply a layer of lubricant to the sealing ring after installation.

Libang seals.

As a sealing material with good sealing performance, sealing ring material has a wide range of applications in many industrial fields, including hardware rubber and plastics, fire protection, pharmaceutical, shipbuilding, pipeline, automobile, machinery, household appliances and so on. Seals are also divided into many shapes, such as V-shaped, U-shaped, O-shaped, rectangular, Y-shaped, etc., and each different shape of sealing ring has different properties and uses. Rubber is one of the most commonly used sealing ring materials, of course, in addition to rubber, there are also sealing ring materials such as graphite, PTFE, sealant, etc.

Below, let's introduce you to several common sealing ring materials and their uses. 

Sealing ring material type:

1.Hydrogenated nitrile rubber

In addition to very good corrosion resistance, tear resistance, compression resistance, deformation resistance and other excellent properties, hydrogenated nitrile butadiene rubber also has good sunlight resistance and ozone resistance. Compared to nitrile rubber, hydrogenated nitrile butadiene rubber is more resistant to abrasion. Generally, its operating temperature cannot exceed 150 °C.

Uses: Hydrogenated nitrile rubber sealing ring is suitable for washing machinery, automobile engine systems and refrigeration systems of new environmentally friendly refrigerants. However, it is best not to use it in alcohol, ester or aromatic solutions.

2.Neoprene

Neoprene has good resistance to oils, impermeability and solvents. In addition, it has excellent weather aging and ozone aging resistance.

Uses: Neoprene can usually be used to make door and window seals, and can be used to make diaphragms and vacuum sealing products at night.

3.Natural rubber

Compared to most synthetic rubbers, natural rubber has better cold resistance, resilience and abrasion resistance. But it is not resistant to mineral oil.

Uses: Natural rubber sealing rings can be used as rubber bowls, rubber rings, sealants, etc. for seals in hydraulic braking systems.

4.Silicone rubber

Silicone rubber has outstanding low temperature resistance and can maintain its unique elasticity in the operating temperature range of -70 260.

Uses: It is used to make the sealing gaskets required in the thermal mechanism, such as strong light source lampshade sealing rings, valve gaskets, etc., but it cannot be used to make oil-resistant sealing products.

5.EPDM

EPDM rubber has good weather resistance, ozone resistance, water resistance and chemical resistance.

Uses: It can be used in sanitary equipment, automobile radiators and automobile brake systems, but it is best not to use it for food purposes.

6.Viton

Viton has very good heat and oil resistance.

Uses: It can be used to manufacture cylinder liner seals, plastic bowls and rotary lip seals, and can significantly improve the service life.

The above is the type and use of sealing ring materials sorted out for you. Seals are the most effective and important means to solve the problem of leakage in the hydraulic system. Once the hydraulic system has insufficient sealing rings, it is likely to leak.

At this point, the leaking liquid can be damaging to the environment and also destabilize the entire working system. Therefore, in many industries, sealing rings are very important sealing materials. The sealing ring also has the advantages of strong corrosion resistance and not easy aging, it has a long working life, and it is also very convenient to use and maintain. , you can get it for free

We all know a lot about the sealing ring. Because every aspect of our lives is inseparable from such a small part. Let me give you a few simple examples, there will be some seals in the heating connections in the house, and there will also be some seals in our gas equipment.

There is a seal on the water pipe, even on some drinks or bottles. This article mainly talks about the sealing ring standard through the application direction of the sealing ring.

Seal materials are not the same as they are being used, so there are a variety of seal standards. Let's talk about a few cases of different uses in detail for readers' reference.

Seals. The first is CR, which is a neoprene seal, which is very resistant to sunlight and weather. It has no effect on refrigerants such as dichlorodifluoromethane and ammonia, and has excellent performance in dilute acid resistance and silicone grease resistance.

In some mineral oils with low aniline points, the expansion is large, and it is easy to crystallize and harden at low temperatures. This product is suitable for all kinds of environments that are exposed to atmosphere, sunlight and ozone, as well as various flame resistant and chemical-resistant sealing links. It is not very good for the erosion of strong acids, nitrohydrocarbons, esters, chloroform and ketones chemicals, and it should be noted that it is generally not recommended.

The temperature used is -55 120.

Seals. The second type of IIR, which is what we call butyl rubber seals, is particularly airtight and resistant to heat and sunlight. In addition, it has good ozone resistance, good insulation performance, and good resistance to polar solvents such as alcohol and ketone esters.

This allows exposure to animal and vegetable oils or oxides. This product is suitable for standards for chemical resistance or vacuum equipment applications. Cannot be used at the same time as petroleum solvents, kerosene or aromatics.

The temperature range is -50 110.

Seals. The third type is ACM, which is what we know as acrylic rubber seals. In general, it has good resistance to oils, etc., and has excellent resistance to high temperatures and weathering.

In terms of mechanical strength and compression set, or water resistance, it is not satisfactory. This is generally used in automotive transmission-related systems or power steering related systems. Also, remember not to use in hot water, brake fluid, or phosphate esters.

The normal temperature is -25 170.

Seals. The fourth type is NR, which is the natural rubber seal. This product has good abrasion resistance and elasticity, and has excellent tear strength and elongation.

It is easy to age in the air and become viscous when heated, easy to swell and dissolve in mineral oil or gasoline, and resistant to alkali but not strong acid. These seals are suitable for use in fluids with hydroxide ions, such as automotive brake fluid and ethanol. The normal temperature is -20 100.

The fifth type is PU, that is, polyurethane rubber sealing ring. We all know that polyurethane rubber has good mechanical properties, and its abrasion resistance and high pressure resistance are far superior to other rubbers. It has good resistance to aging, ozone and oil.

However, it is easy to hydrolyze at high temperature and is used for high-pressure-resistant and wear-resistant sealing. The applied temperature is -45 90 . , you can get it for free

Most are silicone rubber seals, but there are also other materials such as polyurethane.

1. There are three main types of common sealing ring materials, such as rubber, graphite, and PTFE. Rubber seals mainly include natural rubber, silicone rubber, ethylene propylene rubber, fluorinated rubber, nitrile rubber, etc.

2. The sealing ring is an axially acting elastic rubber sealing ring, which is used as a pressure-free seal for the rotating shaft. The sealing ring has good mobility and adaptability, can compensate for large tolerances and angular deviations, can prevent internal grease or oil leakage, and can also prevent the intrusion of external splashing water or dust.

3. The sealing ring should have good sealing performance within a certain range of working pressure and temperature, and the sealing performance can be automatically improved with the increase of pressure.

4. The friction between the sealing ring device and the moving parts should be small, and the friction coefficient should be stable.

5. The sealing ring has strong corrosion resistance, is not easy to age, has a long working life, good wear resistance, and can be automatically compensated to a certain extent after wear.

6. The structure is simple, easy to use and maintain, and the correct maintenance can be used for a longer time.