O-ring wire diameter;  Considering that the o-ring cross section will be deformed and spread after compression, the slot width is generally about 1.3 times of the line diameter.  Groove size: groove bottom diameter /1.04(tensile rate calculated by 4%)= O-ring inner diameter;  Tank depth *1.2(compression rate calculated at 20%)=O  

Extended information  

O-rings are rubber seals with a circular section. They are called O-rings, also called O-rings. It began to appear in the middle of the 19th century, when it was used as a sealing element for the cylinder of steam engines.

The O-ring is the most common mechanical design for sealing because it is cheap, simple to manufacture, reliable to function, and easy to install. The O-rings are subjected to tens of trillions of pascals (thousands of pounds) of pressure. O-rings can be used in static applications or in dynamic applications where there is relative movement between components, such as rotating pump shafts and hydraulic cylinder pistons.

O-ring specifications and standards

O ring specifications are mainly UHSO ring specifications, UHPO ring specifications, UNO ring specifications, DHO ring specifications, piston rod O ring specifications, high temperature O ring, high pressure O ring, corrosion resistance O ring, wear resistance O ring.

O-ring standards are GB 1235-76, GB gb3452.1-92; S TYPE, SS/V TYPE, F TYPE; American STANDARD AS568, British standard series; European standard series

O-ring technical requirements include appearance requirements, size requirements, and material physical properties requirements.

Appearance Requirements Comply with GB/T3452.2-2007

Material requirements are HG/T2579-2008

The size must comply with GB/T3452.1-2005

O ring application introduction

Holes with YX o-ring

Application: used for sealing piston in reciprocating hydraulic cylinder. Scope of application: TPU: general hydraulic cylinder, general equipment hydraulic cylinder. CPU: hydraulic cylinder and high temperature and high pressure oil cylinder used in construction machinery. Material: polyurethane TPU, CPU, rubber.

Hardness: HS85±2°A Working temperature: TPU: -40 ~ +80℃, CPU: -40 ~ +120℃ Working pressure: ≤32Mpa Working medium: hydraulic oil, emulsion.

YX hole with O ring block

Use: This standard is suitable for use with YX type sealing ring when the working pressure of oil cylinder is greater than 16MPa, or when the eccentric force of oil cylinder is stressed, it can protect the sealing ring. Operating temperature :-40 ~ +100 degrees. Working medium: hydraulic oil, emulsion, water hardness: HS 92±5A Material: PTFE.

Axis with YX type O ring

Application: For sealing piston rod in reciprocating hydraulic cylinder scope of application :TPU: general hydraulic cylinder, general equipment hydraulic cylinder. CPU: hydraulic cylinder and high temperature and high pressure oil cylinder used in construction machinery. Material: polyurethane TPU, CPU, rubber

HS85±2°A Working temperature: TPU: -40 ~ +80℃ CPU: -40 ~ +120℃ Working pressure: ≤32Mpa, working medium: hydraulic oil, emulsion.

O-ring has excellent sealing performance and high working life. The working life of dynamic pressure seal is 5-10 times higher than that of conventional rubber seal products, up to tens of times. Under certain conditions, it can have the same life as the sealing matrix.

O-ring friction resistance is small, dynamic and static friction force is equal, is "0" rubber ring friction 1/2-1/4, can eliminate low speed, low pressure movement "crawling" phenomenon.

O - ring high wear resistance, sealing surface wear with automatic elastic compensation function.

O - ring good self - lubrication performance. Can be used for oil free lubrication seal.

O-ring structure is simple, easy to install.

O-ring working pressure: 0-300mpa; Working speed: ≤15m/s; Operating temperature: -55-250 degrees.

O-ring applicable media: hydraulic oil, gas, water, mud, crude oil, emulsion, water-glycol, acid.

Designed to be used

O ring design, improper use will accelerate its damage, loss of sealing performance. The experiment shows that if each part of the sealing device is designed properly and the pressure is increased, the o-ring will not be damaged. Under high pressure and high temperature working conditions, the main reasons of o-ring failure are permanent deformation of o-ring material and gap bite caused by o-ring being squeezed into the sealing gap, and o-ring distortion occurs during movement.

Permanent deformation

Because the synthetic rubber material used for o-ring sealing ring belongs to viscoelastic material, the compression amount and rebound blocking ability set at the beginning will gradually lose permanent deformation after a long time of use, and eventually leak. Permanent deformation and elastic loss are the main reasons for the loss of sealing performance of o-rings. The following are the main reasons for permanent deformation.

1. The relationship between compression rate and tension and permanent deformation;

2. The relationship between temperature and o-ring relaxation process;

3, medium working pressure and permanent deformation;

The permanent deformation rate of O - ring materials depends on temperature. When the deformation rate is 40% or greater, there will be leakage, so the heat resistance limit of several rubber materials is: nitrile rubber 70℃, epDM rubber 100℃, fluorine rubber 140℃.

Therefore, the permanent deformation of O-ring has been stipulated in various countries. The size changes of O-ring of Chinese standard rubber material at different temperatures are shown in the table. For the o-ring of the same material, the compression permanent deformation rate of the o-ring with large cross section diameter is lower at the same temperature.

It's a different story in oil. Because the O ring does not contact with oxygen at this time, it generally occurs in the dynamic seal state. If the o-ring is properly assembled and the use conditions are appropriate, it is generally not easy to produce rolling or distortion in the reciprocating motion, because the contact area of the O-ring and groove is greater than the friction contact area on the sliding surface, and the resistance of the O-ring itself can prevent distortion.

The distribution of friction also tends to keep the O-ring stationary in its groove, since static friction is greater than sliding friction and the roughness of the groove surface is generally less than that of the sliding surface.

The material classification

Natural rubber NR

Natural Rubber is a polymer of isoprene made from Rubber latex collected from Rubber trees. Good wear resistance, high elasticity, tensile strength and elongation. Aging in air, sticky when heated, easy to expand and dissolve in mineral oil or gasoline, alkali resistance but not strong acid resistance.

It is the raw material for making adhesive tape, rubber hose and rubber shoes, and is suitable for making shock absorbing parts, used in automobile brake oil, ethanol and other liquid products with hydroxyl radical.

Butadiene gum S, B, R

Styrene Butadiene Copolyme is a copolymer of Butadiene and Styrene. Compared with natural rubber, it has uniform quality and less foreign matter, but has weaker mechanical strength. It can be blended with natural rubber.

Advantages:

1, low cost non-oil resistant material

2, good water resistance, hardness below 70 with good elasticity

3, high hardness with poor compression distortion

4, can use most of the neutral chemical substances and dry, nourishing organic ketone

Disadvantages: strong acids, ozone, oils, esters, fats and most hydrocarbons are not recommended. Widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.

Silicone fluororubber FLS

Fluorinated Silicone Rubber is a Silicone Rubber that has been Fluorinated and has the same general properties as both fluorine Rubber and Silicone Rubber. Its oil resistance, solvent resistance, fuel oil resistance and high and low temperature resistance are good, the general use of temperature is -50~200 ℃.

Advantages:

1, suitable for special purposes, such as required to resist the erosion of oxygen-containing chemicals, solvents containing aromatic hydrogen and solvents containing chlorine.

Disadvantages:

2. Do not expose to brake oil, ketones and callosal solution.

Fluorine rubber (FPM

Fluoro Carbon Rubber Any of various types of Rubber containing fluorine molecules, depending on fluorine content (i.e. monomer structure). The widely used hexafluoride fluororubber was first listed by DuPont under the name of "Viton". High temperature resistance is better than silicone rubber, has excellent chemical resistance, resistance to most of the oil and solvent (except ketone, ester), weather resistance and ozone resistance; Cold resistance is poor, the general use of temperature range of -20~250 ℃. Special formula can withstand low temperature up to -40 ℃. Advantages:

1, heat resistance to 250 ℃

2. It has resistance to most oils and solvents, especially all acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and plant oils

Disadvantages:

1. It is not recommended to use in ketones, esters of low molecular weight and mixtures containing nitrate. · Automobiles, locomotives, diesel engines and fuel systems.

2, chemical plant seals.

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