Other Products / Services #4964163

Mechanical seal rings are used to seal the clearance between the rotating shaft and the stationary housing in equipment such as pumps and mixers, so that liquid can not leak out through this clearance. These sealing mechanisms are often referred to as shaft seals or pump seals. Metallized Carbon Corporation manufactures the mechanical Primary Rings or CarbonGraphite Wear Faces used in many of todays most sophisticated and reliable mechanical seals for industrial, aerospace and military applications. These mechanical seal assemblies usually consist of a primary seal ring manufactured using carbon graphite materials, a counter face ring, secondary (O-ring) seal rings, springs, fasteners, and a metal housing. Mechanical seal assemblies are also used to seal gases in high speed compressors. These dry gas seals are double mechanical seals that utilize a controlled barrier gas and spiral grooves in the counter face which provide aerodynamic lift off or gas lubrication between the seal faces. Mechanical seal primary rings can be supplied to customer drawings and specifications. The rings can be supplied plain, shrink fitted or cemented in metal retaining rings. Metcar mechanical seal rings can also be supplied with the sealing face lapped flat to one helium light band.

Carbon-graphite materials are used extensively for vanes, rotors, and end plates in rotary vane pumps pumping both liquids and gases. Carbon graphite vanes can withstand the rubbing of the vane tip against the housing bore and the rubbing of the side of the vane against the slots in the rotor. Carbon graphite rotors are light in weight to save energy and can also withstand the rubbing of the vane against the end plates. Carbon graphite end plates are pressure tight and dimensionally stable so that they can make a close clearance seal with the rotor and vanes. They must also withstand the rubbing of both the vanes and rotor. All three components provide superior lubrication in most environments. Carbon-graphite vanes, rotors and end plates are used for pumping liquids with poor lubrication properties (low viscosity) such as water, gasoline and beverages. They are also used for pumping strong chemicals that attack metals. Carbon-graphite vanes, rotors and end plates are also used to pump gases such as air, vacuum, combustion products and gasoline vapors. Metallized Carbon Corporation supplies carbon-graphite vanes, rotor, and end plates to rotary pump and compressor manufacture and rebuilders. The vanes, rotors and end plates can be supplied to customer prints and specifications.

Type SA-PB Pillow Blocks and Flange Blocks are a uniquely designed compact unit (Patented) requiring minimum support space. These units are self-aligning, ruggedly constructed and suitable for non- lubricated heavy duty applications. Fitted with a variety of Metcar Self-lubricating Bearing Grades which can be operated dry or submerged to temperatures of 1000 F. Special features of these heavy duty units are:Completely self-aligning (compensate for shaft deflection and misalignment)Can be used dry or submerged to temperatures of 1000 F.Replaceable Bearing Cartridge can be rotated 180 for double life (no need to remove from shaft)Interchangeable with most standard ball bearing pillow and flange blocks.Operate freely and quietly under heavy loadsCan be modified for thrust loading10 sizes available for shafts up to 3-38"2 Standard Bearing Cartridge lengths available (A and A-Ext.) Bearing length (A) medium duty applications, bearing length (A-Ext.) heavy duty applications.Unlimited Bearing Cartridge length available for unusual load and speed conditions.Available in stainless steel for corrosive applicationsNormally supplied with the following grades of Self-lubricating Metcar Bearings:Metcar 1010 Babbitt Dry or submerged applications up to 350 F.Metcar 1515 Copper High temperature applications up to 750 F.Metcar 2500 High temperature applications up to 1000 F.

Carbon-graphite bearings and thrust washers are used in high temperature applications because oilgrease lubricated, metallic bearings can start to have problems at temperatures above about 350F (177C). Oilgrease lubricants can start to melt, volatilize or carbonize above this temperature. When this occurs, oilgrease-lubricated metallic bearings start to experience high friction, high wear, galling, vibration and even seizing. At high temperatures, plastic and composite bearings are subject to other problems such as softening, melting, deformation and may extrude out of the bearing area all together. Carbon graphite bearings are ideally suited for applications at elevated temperatures because they rely on graphite for their self-lubricating properties. These solid homogeneous bearing materials do not contain oilgrease lubricants and they do not rely on oilgrease for lubrication. Thus, bearings manufactured from these carbon graphite materials are not subject to the shortcomings associated with petroleum-based lubricants at elevated temperatures. Because the carbon graphite matrix is very strong, it is not subject to the deformation, melting, or even softening that can occur with plastic bearings at these elevated temperatures. Room Temperature or Cold Temperature Dry Running Applications Carbon-graphite bearings are also used for dry running at room temperature or cold temperatures. This occurs in applications where oilgrease lubricated metal bearings can not be used because:Oilgrease lubricants volatilize in vacuumAt low temperatures, oilgrease lubricants can congeal, freeze, or solidifyIn environments containing abrasive dust which is attracted by oilgrease lubricants to form a paste that increases bearing wear.In high load, slow roll, start-stop equipment where oilgrease lubricants can be squeezed out of the rubbing surface and cause metal-to-metal contact.Where the bearings need to conduct an electric current.In sanitary or clean conditions where oilgrease lubricants could leak out and destroy product such as food, textiles, pharmaceuticals, paper, etc.

Type SA-PB Pillow Blocks and Flange Blocks are a uniquely designed compact unit (Patented) requiring minimum support space. These units are self-aligning, ruggedly constructed and suitable for non- lubricated heavy duty applications. Fitted with a variety of Metcar Self-lubricating Bearing Grades which can be operated dry or submerged to temperatures of 1000 F. Special features of these heavy duty units are:Completely self-aligning (compensate for shaft deflection and misalignment)Can be used dry or submerged to temperatures of 1000 F.Replaceable Bearing Cartridge can be rotated 180 for double life (no need to remove from shaft)Interchangeable with most standard ball bearing pillow and flange blocks.Operate freely and quietly under heavy loadsCan be modified for thrust loading10 sizes available for shafts up to 3-38"2 Standard Bearing Cartridge lengths available (A and A-Ext.) Bearing length (A) medium duty applications, bearing length (A-Ext.) heavy duty applications.Unlimited Bearing Cartridge length available for unusual load and speed conditions.Available in stainless steel for corrosive applicationsNormally supplied with the following grades of Self-lubricating Metcar Bearings:Metcar 1010 Babbitt Dry or submerged applications up to 350 F.Metcar 1515 Copper High temperature applications up to 750 F.Metcar 2500 High temperature applications up to 1000 F.

Radial seal ring assemblies are used to seal the clearance between a rotating or reciprocating shaft and the stationary housing on many types of machines. Carbon-graphite radial seal assemblies were developed to help solve serious leakage problems that occur when materials such as leather, plastic, composite or elastomeric materials are utilized in the stuffing box seals installed on industrial blowers, pumps and other turbo machinery. These problems occur because of wear, thermal degradation, chemical attack and dimensional stability problems with elastic seal ring materials. To accommodate some anticipated movement in a reciprocating or rotating shaft such as thermal expansion or run out, carbon-graphite radial seal rings are normally designed to float with OD clearance within a chamber in the stuffing box. This allows a close clearance seal to be maintained between the OD of the shaft and the ID of the carbon-graphite seal ring. Leakage around the OD of the carbon-graphite seal ring is minimized by using a close clearance between the width of the carbon-graphite seal ring and the width of the metallic seal housing cavity. There are two types of carbon-graphite radial seal rings. Close clearance carbon-graphite seal rings are one piece, solid rings that are made to fit with close clearance on the OD of the rotating or reciprocating shaft. If the shaft is expected to expand because of thermal expansion, the carbon-graphite ring should be shrink-fitted into a metal retaining ring. This affords the carbon graphitemetal assembly the same thermal expansion rate as the shaft. The metal retaining ring shrink fitted around the carbon graphite clearance seal should be of the same metal as the shaft. This allows the close clearance between the shaft OD and carbon-graphite seal ring to be maintained even at high temperatures.