Carbon Seal Ring

Listing ID #3994494

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Supply Type Manufacturer, Exporter, Supplier

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Product Details

Mechanical Seal Ring Materials require high strength and a relatively high modulus of elasticity to with stand deformation at the interface. Carbon-graphite seal materials provide the strength and rigidity which are especially important in high pressure , high vacuum , high temperature and zero leakage mechanical end-face seals. High thermal conductivity is essential in removing heat from the interface.

Pure carbon graphite is strictly speaking a ceramic material , but in the form that it is used for seals it will usually be impregnated with other materials that are provided to variously improve the sealing. By reducing porosity , wear performance or strength is increased. it is widely used , not only as one of the face pair on the vast majority of mechanical seals , but also found as the most popular material for segmented circumferential seals and for piston rings in dry or marginally lubricated conditions.

Impregnation of Carbon - Graphite Seals

Impregnation of carbon seals can be done with a variety of materials to control permeability. in addition to thermoset resins , other types of impregnants include thermoplastics , metals and inorganic salts or glasses. The temperature limit of the impregnant places an upper limit on the operating temperature of the carbon parts.

Metals such as antimony , silver , copper , nickel and babbitt can improve the strength , thermal conductivity , and tribological characteristics of the materials. Impregnants made of inorganic salts usually phosphate or borate - and glasses are used in high temperature applications. Carbons impregnated with soluble salts must be handled carefully to avoid exudation , especially under humid conditions , but loss of impregnant rarely affects any physical property of a seal other than permeability.

Mechanical seal primary rings can be supplied as per customer drawings and specifications. The rings can be supplied plain , shrink fitted or cemented in metal retaining rings. Mechanical seal rings can also be supplied with the sealing face lapped flat to one helium light light band.

Guidelines for the installation & Design of Carbon Seal Rings

Solid Carbon Rings : Normally the seal rings are used in solid form machined from suitable size of carbon blank. The Shape and size of the rings vary according to the design of mechanical seals which are designed for its respective operating conditions. Since carbon - graphite are stable at high temperature , majority of the seal ring designs consitute solid rings.

Cold Pressing : For a cold press fit in steel , where the application is lower than 100^o C steel housings made to H7 bore tolerance are normally recommended. if the housing material has a higher coefficient of thermal expansion than steel the temperature limitation is normally lower. When pressing bearing into its housing a mandrel with collar whose diameter is approximately three tolerances be low the drilling tolerance of the carbon bearings as supplied should be used to press the bearings in. the bore diminishes by 70 - 80% of the pressing over dimension according to the quality and dimension of the housing.

Shrinking : We Recommend shrinking carbon seal rings directly into the metal housing which are to be used at operational temperatures of over 100^o C. To shrink in the bearings , experience has shown that the tolerance overlap should be in the range corresponding H7 / x8...z8. The selected Heating temperature for mounting must be sufficiently high to allow the cold bearings to be easily inserted. On shrinking the carbon bearing bore diminishes by approximately 80...100% of the shrinking overdimension. in the case of the above mentioned shrink fits H7 / x8...z8 this diminishes according to the wall thickness ratio. in order to keep to exact tolerances it is advisable to machine the bearing bore to size after shrinking.

Adhesives : Adhesives are only suitable for bearings which are subject to low temperatures ( up to 200^o C ). Bonding to the housing with commercially available adhesives is possible.for higher temperatures , thermal setting adhesives should be used.

Suitable Counter Face Materials

Suitable :Plain Steel , alloyed steel (Chrome Steel) , Hard Metal , Ceramic & glass.
Suitable under certain conditions :Nonferrous heavy metal , chrome nickel steel , chromium plate materials.
Unsuitable :Aluminium and its alloys.

Company Details

In 1974 a visionary named Usmangani R Shaikh, with science academic background identified the unfulfilled needs of then flourishing textile industries of Ahmedabad for carbon products used for electircal and mechanical applications.
Instantaneously making the most of his technical flair, management skills and risc taking attitude and available team, he embarked on a project to manufacture carbon components like carbon brushes, seal rings and all the carbon products required for various textile machineries of then period. The project named GUJARAT CARBON PRODUCTS started in a small room and with a single work station but with a broad vision, well defined mission, set goals and accurate planning and controlling.
This was earliest impetus by someone in this industry toward which very few people were familiar. Raw material procurement was the biggest problem and equally problematic was the availability of tools and machinery to be used for this unfamiliar material. Striving through these known and numerous unknown problems he succeeded in satisfying the customer need and could establish himself as a pioneer in manufacturing and supplying industrial carbon products in entire Gujarat state.
In 1995 second generation equipped with fresh talent and modern skills and inheriting the experience and know-how of parent, commenced additional project with a new company to provide a thrust which still continues.
Progression was now at the forefront and still continues. By day and night, months and years the affair which started in a small room, have snowballed today into an organisation named GRAPHICARB PRODUCTS- AN ISO 9001-2008 certified company which is the only and the biggest company in Gujarat-INDIA to make carbon products for mechanical and electrical application for all the industries and having stretched value chain from raw material to finished product stage.
Today Graphicarb Products boasts of manufacturing all the products made out of carbon-graphite using minutely selected raw material, state of art machineries, well defined standard operating procedures, best possible factory layout, adequate land space, precision and accurate measuring instruments and stringent quality policy.
Company today looks ahead for a bright future and is commited in serving the needs of its customers satisfactorily. Every day with continual improvement policy, organisation is making every effort towards betterment and success through one and only one policy “Growth through customer satisfaction”