Rubber cuffs. Rubber sealing cuff for sewerage Reinforced rubber sealing cuffs

Hydraulic cuffs used in different types of hydraulic systems to seal the gaps between the cylinder and the piston (plunger and rod). Since hydraulic mechanisms operate using energy from fluid, they must have high resistance to exposure to various liquids. Typically, energy carriers in hydraulic systems can be the following fluids:

Mineral oils

Synthetic oils

Semi-synthetic oils

Water-oil emulsions

Silicone based liquids

Glycol based fluids

Liquids based on an alcohol-castor mixture

In many cases, special additives are additionally added to hydraulic fluids. For example, this could be viscosity additives for thickening liquids. Additives against oxidation, corrosion or foam are also found. Additives are often added to protect the hydraulic system from wear. That's why rubber sealing cuffs For hydraulic devices Produced from sustainable grades of rubber compounds.

Naturally, each brand of rubber is strictly suitable for certain operating conditions. Should not be used hydraulic cuffs for a long time of operation at the maximum permissible values ​​of operating temperature, speed, pressure and frequency of operation, as this will entail rapid wear of the product. Rubber seals for hydraulic devices operate under the following conditions:

Characteristics of hydraulic seals

Hydraulic cuffs have several different types structural design. Depending on the specific type of structure hydraulic seal sizes are changing. In addition, the type of execution also affects specifications products. For example, in different options structural design rubber sealing cuffs for hydraulic devices operate at different operating pressure ranges.

Hydraulic cuff GOST 14896-84

To date hydraulic cuffs have one interstate standard for production. This standard is GOST 14896-84. By GOST 14896-84 hydraulic cuff can be made from a rubber base or polyurethane.

Hydraulic cuff GOST 14896-84 has several different forms release, each of which has a unique design and dimensions. Actually, depending on the design, rubber cuffs are divided into the following 3 types:

Hydraulic seal for pressures from 0.1 to 50 MPa (type 1)

Hydraulic seal for pressures from 0.25 to 32 MPa (type 2)

Hydraulic seal for pressures from 1.0 to 50 MPa (type 3)

Hydraulic cuffs GOST 14896-84 Type 2 is not currently available. Instead, it is customary to use interchangeable cuffs of type 3 or hydraulic cuffs of a similar design and size, but manufactured in accordance with TU 38-1051725-86.

Dimensions of hydraulic cuffs GOST 14896-84

Depending on the material of manufacture, hydraulic cuffs GOST 14896-84 can withstand the following substances:

Mineral, synthetic, semi-synthetic oils

Fuel cells: gasoline, fuel oil, oil

Oil based greases

Vegetable and animal oil

Vegetable and animal fat

Brake fluids

Soap solutions

Hot water

Example of marking ( symbol) rubber cuffs

Hydraulic cuff GOST 6969-54

Features a unique hem design similar to a collar. Due to this visual similarity rubber sealing collar GOST 6969-54 in many industries it is called collar cuff.

Hydraulic cuff GOST 6969-54 was developed to seal the gaps between the piston and cylinder (plunger and rod) in a variety of various types hydraulic systems (machines and mechanisms), the shaft diameter of which does not exceed 300 millimeters.

Hydraulic cuff GOST 6969-54 intended for equipment designed before 1971. This manufacturing standard has now been invalidated and rubber sealing hydraulic cuffs They haven’t produced it for a long time!

To replace the standard GOST 6969-54 another standard has arrived - GOST 14896-74, in which structural type 2 was used as the design of the collar cuff. However, at present this type of design is also not produced according to this standard.

Instead of this standard it is customary to use technical specifications TU 38-1051725-86. Overall standard TU 38-1051725-86 implies exactly the same design parameters and dimensions as the standard GOST 6969-54 . The dimensions of the hydraulic cuff are:

Dimensions of hydraulic cuffs GOST 6969-54

Hydraulic cuffs GOST 6969-54 (TU 381051725-86) are resistant to the following environments and substances:

Solar radiation

Low and high temperatures

Frictional effects

Aging

Fuel cells

Rubber cuffs are seals that are widely used in mechanical engineering and other industries. They provide sealing of moving joints of rotating and translational motion - for example, the piston and rod of a hydraulic cylinder. With their help, leakage of gases and liquids through the gaps between parts of machines and mechanisms is eliminated, and the penetration of dust, moisture and dirt into internal structural elements is prevented.

Types of products

Rubber cuffs are divided into several types depending on their purpose, design features and the document regulating the requirements for them:

	GOST 14896-84. Rubber cuffs produced according to this standard are characterized by the absence of reinforcement. They are designed for contact sealing of the rod and plunger in various hydraulic systems. They are used for linear relative velocities of sealed parts up to 0.5 m/s, an operating frequency of no more than 0.5 Hz and a stroke value of up to 10 m. Operating temperature range - from –60 to 200 °C, nominal pressure - within 0. 1…50 MPa.
	GOST 6678-72. This document regulates the production of rubber unreinforced cuffs for pneumatic devices. They are designed for operation in air containing oil and fuel vapors. Withstand relative linear speed up to 1 m/s and pressure up to 1 MPa. Operating temperature range - from –65 to 150 °C.
	GOST 8752-79. The standard applies to reinforced rubber cuffs intended for sealing shafts. They can be used with working media such as water, mineral oil, diesel fuel. The pressure should not exceed 0.05 MPa, and the temperature should be within –60...70 °C. These RTIs come in single-edge versions with and without a boot.
	TU 38-1051 725-86. These technical conditions were introduced instead of the outdated GOST 6969-54. They regulate the requirements for cuffs used to seal the gap between the hydraulic cylinder and the piston. Products manufactured under this standard are intended for the repair and maintenance of equipment designed before 1971.



In many cases, the use of rubber cuffs to seal moving joints is impractical due to the complexity and rather high cost of such products. In such situations, you can get by with a properly sized rubber O-ring. These rubber products are manufactured in accordance with the following standards:

	GOST 9833-73. It sets the requirements for the rings round section, which can replace rubber cuffs for radial and mechanical sealing of moving and fixed joints. The products are used in hydraulic, pneumatic, fuel and lubrication systems. Manufactured from oil-resistant and heat-resistant materials.
	GOST 18829-73. This standard also regulates the technical characteristics of O-rings. They are capable of replacing rubber cuffs in pneumatic, hydraulic, lubricant, fuel systems with pressures up to 50 MPa (fixed joints), 32 MPa (moving joints of hydraulic systems), 10 MPa (moving joints of pneumatic systems). They can be oil and petrol resistant (MBS) or heat-frost-acid-alkali resistant (TMKShch).
	GOST 15180-86. This document applies to flat elastic gaskets of rectangular cross-section. Products can be used in contact with media such as air, water, steam, acids, alkalis, and solvents. Typically, they are used in static nodes and connections. Gaskets are suitable for sealing flanges, shut-off valves, and pipeline elements.

Bart LLC presents high-quality rubber cuffs and O-rings. All products are certified for compliance state standards or technical specifications.

Hydraulic seals are designed to seal the gap between the cylinder and the piston (plunger, rod) in hydraulic devices operating in reciprocating motion. Hydraulic cuffs GOST 14896-84 are made of oil- and petrol-resistant rubber of group 4 (IRP-1068-1) or group 6 (B-14-1). Performance do not change at t° from -60 °C to +100 °C.

Rubber sealing cuffs in Moscow

Example of symbol: 1-Dxd - 4, Where:
1 – cuff type
D – cylinder diameter (mm)
d – rod diameter (mm)
4 – rubber group

Cuff for hydraulic devices protects parts hydraulic systems from dust and dirt, and also saves the consumption of working fluid. The cuff is used in various industrial sectors, depending on the type:

• cuff for hydraulic devices- ensures the tightness of hydraulic devices in units and machines;
• chevron sealing cuff- designed for sealing rods and cylinders in hydraulic devices operating in oil, water emulsions, sea and fresh water;
• sealing cuff for pneumatic devices- designed for sealing rods and cylinders in hydraulic devices operating under pressure conditions from 0.1 to 50 MPa, at temperatures from -65 o C to +150 o C.

Rules for the operation of rubber sealing cuffs for hydraulic systems. To extend service life cuffs for hydraulic devices and ensuring reliable sealing it is necessary:

• Check moving parts regularly for damage. If defects are detected, the surface should be treated until it meets the roughness standards. Otherwise, wear of the cuff may lead to breakage of the part and the need for repair;
• ensure the cleanliness of the parts on which the rubber sealing collar is installed. To ensure further use of the cuff, contamination must be removed in a timely manner. Otherwise, the cuff will quickly become unusable and begin to leak working fluid and dust out, which will cause rapid wear of the equipment.

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"Siberia - Industrial Investments" offers products High Quality, produced in compliance with standards that exclude defects. Qualified specialists will assist you in choosing products to suit your requirements. The company's warehouses are located in Moscow. Products are delivered throughout Russia and neighboring countries.