Rubber Y-Ring Seal

Description:

The section of the Y-Ring sealing is Y-shaped, which is a typical lip-shaped sealing ring. It is widely used in reciprocating dynamic sealing devices because of its service life and sealing performance higher than that of O-rings. However, its cross-sectional size is larger than that of the O-ring, so the size of the installation groove is larger, and sometimes a split groove is used for ease of installation. The Y-Ring sealing ring can adapt to the requirements of pressure and sealing performance by changing the section structure and size. When the Y-ring is installed, the lip must face the side with high pressure to play a role, so the Y-ring can only work in one direction. Usually, the applicable working pressure of the Y-Ring sealing ring is not more than 40MPa, and the working temperature is -30～80℃.

Classification:

Y-Ring seal can be classified into wide Y-Ring, narrow Y-Ring, and Yx-Ring according to the length and width ratio of the section. The pressure resistance of the wide-section Y-Ring is slightly lower than that of the narrow Y-Ring, and it can only be used in the working environment with a pressure less than 20MPa, while the narrow Y-Ring can be used on occasions where the working pressure is less than 32MPa.

According to whether the height of the two lips is consistent, the Y-Ring can be classified into unequal-height lip Y-Ring seals for shafts, unequal-height lip Y-Ring seals for holes, and equal-height lip Y-Ring

According to different manufacturing materials, Y-Ring sealing rings can also be classified into nitrile rubber Y-Ring, fluororubber Y-Ring sealing, polyurethane rubber Y-Ring, etc. The working speed range is different for different materials. When it is made of nitrile rubber, it is 0.01~0.6m/s; when it is made of fluororubber, it is 0.05~0.3m/s; when it is made of polyurethane rubber, it is 0.01~lm/s. The sealing performance, service life, and working pressure limit of the Y-Ring are all made of polyurethane rubber.

Features:

1. Advantage

· Reliable sealing performance.

· Small frictional resistance and smooth movement.

· Good pressure resistance, wide range of applicable pressure.

· Simple structure and low price.

· Easy to install.

2. Disadvantage

· Y-Ring seal can only work in one direction, and a pair of Y-Ring seals are required for bidirectional sealing of pistons, which increases the axial dimension;

· The cross-sectional size of ordinary Y-Ring is larger than that of an O-Ring, so the size of the installation groove is larger, and sometimes a split groove is used for easy installation. We have developed Y-rings with small cross-sectional sizes, and the size and installation problems are being gradually improved.

Material:

The most commonly used materials for Y-rings are polyurethane rubber, nitrile rubber, fluororubber and polyurethane rubber etc.

1) Polyurethane rubber Y-ring (UR) has good sealing performance, and its service life and working pressure limit when using different retaining rings are relatively high. It has excellent wear resistance and good air-tightness, only has moderate oil resistance, oxygen resistance and ozone aging resistance, and is not resistant to acids and alkalis, water, steam and ketones. And the polyurethane rubber Y-ring is not resistant to high temperature. The temperature does not exceed 60°C in motion, and the temperature range is -30°C-80°C in rest.

2) Nitrile rubber Y-ring (NBR) - suitable for use in petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is the most versatile and lowest cost rubber seal. Not suitable for polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. The general operating temperature range is -40~120 ℃.

3) Hydrogenated nitrile rubber Y-ring (HNBR) - has excellent corrosion resistance, tear resistance and compression deformation resistance, and has good ozone resistance, sunlight resistance and weather resistance. Better wear resistance than nitrile rubber. It is suitable for washing machines, automobile engine systems and refrigeration systems using new environmentally friendly refrigerant R134a. Not recommended for use in alcohols, esters or aromatic solutions. The general operating temperature range is -40~150 ℃.

4) Silicone rubber Y-ring (SIL) - has excellent heat resistance, cold resistance, ozone resistance, and atmospheric aging resistance. It has good insulating properties. But the tensile strength is worse than ordinary rubber and not oil resistant. Suitable for household appliances such as electric water heaters, electric irons, microwave ovens, etc. It is also suitable for various articles that come into contact with the human body, such as kettles, water dispensers, etc. Not recommended for use in most concentrated solvents, oils, concentrated acids and sodium hydroxide. The general operating temperature range is -55~250 ℃.

5) Fluorocarbon rubber Y-ring (FKM) - high temperature resistance is better than silicone rubber, has excellent weather resistance, ozone resistance and chemical resistance, but poor cold resistance. It is resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. Suitable for sealing requirements of diesel engines, fuel systems and chemical plants. It is not recommended to be used in ketones, low molecular weight esters and mixtures containing nitrous. The general operating temperature range is -20~250 ℃.

6) Fluorosilicone rubber Y-ring (FLS) - its performance has both the advantages of fluororubber and silicone rubber, and it has good oil resistance, solvent resistance, fuel oil resistance and high and low temperature resistance. It can resist the corrosion of oxygen-containing compounds, solvents containing aromatic hydrocarbons and solvents containing chlorine. Generally used in aviation, aerospace and military purposes. Exposure to ketones and brake fluid is not recommended. The general operating temperature range is -50~200 ℃.

Installation Tips:

1) Before installation, clean the V-Ring to prevent iron filings, sand, cotton yarn, or other sundries from being brought in.

2) Clean the sealing coupler and groove.

3) The end of the hole or shaft must be chamfered to prevent the lip of the V-Ring from being damaged during installation.

4) If the diameter of the thread or undercut of the piston rod head is the same as that of the piston rod, a special sleeve should be used for installation. If there is no special tool, it can also be installed after wrapping tape on the threaded part.

5) Try to avoid opening pressure oil holes on the inner wall of the cylinder or the piston rod where the V-Ring seal passes. If the V-Ring must pass through holes, the edges of these holes should be chamfered or rounded to prevent damage to the seal.

6) In order to reduce assembly resistance and facilitate installation, the lip ring and the mounting part can be coated with grease or working oil.