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Very versatile Mechanical Seals manufactured in accordance to UNI EN 12756 (ex DIN 24960) standards, are widely used in the chemical industry and in general duties.
They are available in both single-spring and multi-spring balanced versions, for shaft diameters greater than 100 mm, and all of them allow the double directional rotation.
Double seals with single-bodies are available for reducing axial dimensions.
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Mechanical seals are available as: single, double complete with pumping ring, single with V-ring, single and double seals capable for dry running.
All of these seals are suitable for DIN and ANSI type flanges, which have very limited radial and axial dimensions and are ideal for pumps, mixers, fans and other equipment.
The cartridge assembly minimises installation problems to a minimum and is suitable for most applications.
There is also a version available with a thicker shaft sleeve and larger internal clearances designed for fitting to equipment and stirrers that are submitted usually to substantial mechanical stresses, oscillation, vibration and run-out.
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Mechanical seals suitable for corrosive fluids, widely used in chemical industry.
They are made of special materials resistant to chemical attacks and have no metallic parts in contact with product.
Double seals with single-bodies are available for reducing axial dimensions.
Using suitable technical features and special materials we can manufacture versions suitable for dry running, these can also be used also in stirrers.
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Conax Buffalo Technologies designs and manufactures a complete line of pressure/vacuum mechanical sealing glands and assemblies for wires and probes for virtually every industry. A wide range of catalog standard sealing glands are available from stock, while unlimited custom designs are also available for unique wire or probe sealing applications.
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Seals have been developed to operate on propeller shafts of small, medium and large size boats where a high level of reliability is required.
The special design allows large axial displacement and the use of suitable material guarantees as well as high resistance to corrosion and high mechanical resistance to withstand stresses produced by vibrations.
The installation of mechanical seals in this particular field has solved problems such as corrosion during long periods of inactivity and shaft damage caused by traditional stuffing boxes. Power absorption is considerably reduced as well.
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Single seals or double seal units with integral flanged and jacketed casings.
Cartridge seals are available with an integral bearing mounted in the seal housing and are available in various options according to the seal type specified.
Specific seals are designed to compensate for use in mixers with high side entry, low side entry and lateral side loading, or for many other machines such as driers, reactors and dynamic filters.
In addition to standard versions we produce specials designed in accordance to specific customers' drawings for use in the pharmaceutical, food and chemical industries.
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Cartridge mounted mechanically balanced seals, manufactured in accordance with API 682 standards. These seals are designed for heavy duty applications and/or applications which are dangerous to both people and surrounding atmosphere.
They offer the best performance possible in terms of reliability and gaseous emission control, making them the ideal solution for petrochemical plants.
They are available as single or double seal construction in the various versions required by API Standards.
The metallic bellows designs are particularly suited to high temperature and/or corrosive liquids.
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TBA Mechanical Seals are available compliant with standard UNI EN 12756 (ex DIN 24960).
They are supplied with springs outside of the product, so they can be used in particularly dirty and/or viscous liquids and can be fitted to parallel shafts and sleeves. No shoulder or stepped shaft is required.
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The TSMA Mechanical seals are available compliant with UNI EN 12756 (ex DIN 24960) standards.
The metal bellows design avoids clogging caused by dirty liquid and maintains the axial elasticity required to work in crystallising products.
There are also many versions available for high temperature applications and special cartridge designs complete with flange and cooling jackets.
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Mechanical seals manufactured in a wide range of general services, made according to standard UNI EN 12756 (ex DIN 24960).
Using a conical spring is wound onto the shaft allows the seal to compensate greater positioning errors than usual and there is no risk of clogging when it is in contact with very dirty and/or viscous liquids.
This type of seal is available for both clockwise or anticlockwise shaft rotation.
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Capable of operating as a pressure less tandem seal or as a pressured double seal, LATTYseal B 14810 DB guarantees, by inventory shrinkage, a TCO reduction, while maximum sealing flexibility and reliability are given by this one product that fits more than one application.
Chemical and petrochemical, automotive, food processing industry, etc.
All corrosive, abrasive and slightly clogging fluids.
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Chesterton’s 186HT Single Bellows High Temperature Cartridge seal is designed to provide greater reliability in the most demanding services.
Chesterton offers the proven, nesting ripple bellows design. In the nesting ripple design, all bellows plates are identical and contoured to permit nesting when compressed. Nesting distributes pressure uniformly accross the span of the bellows. The end result is less stress at the bellows welds.
While the industry standard is nine convolutions bellows spring, Chesterton uses a twelve convolution bellows core.The twelve convolutions achieves maximum bellows plate thickness while it does not compromise the bellows spring rate. The design offers lower heat generation and greater seal reliability.
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The modular family concept of John Crane's Universal Cartridge will change your approach to sealing. Since the 5600 Series' components are interchangeable, you can apply one seal family throughout your plant. This gives you the flexibility to cover more applications with less inventory, which means your maintenance is simplified, downtime is reduced, plant operating efficiency is increased, and costs are lowered.
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In terms of sealing quality and protection of the environment, these seals are just about the best thing you can get for your pumps. No matter how demanding your applications, our mechanical seals are among the most successful in the world. Maybe the widely acknowledged quality of our products, combined with reliable service and our wealth of experience will help you make up your mind?
Product Basics
Selection to Operating Conditions (CASS)
Application examples
Product Index
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Unique Spiral Groove Technology
Patented John Crane spiral grooves are machined into the mating ring faces. A pressurized suitable inert gas is injected between the seals. As the shaft rotates, gas flows into the tip of the spiral groove and is compressed at the sealing dam, the ungrooved portion of the mating ring. At the sealing dam, gas is expanded. The resultant film pressure gives an opening force greater than the closing force, thus separating the faces.
The Type 2800 spiral groove continues to operate, even if barrier gas pressure is momentarily lost, maintaining the gas film between the barrier gas and the process
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Mechanical seals are used for the sealing of rotating shafts against a stationary housing, e.g. in pumps and agitators. The stationary" part of the seal is usually located at the housing, the rotating" part is fixed on the shaft. The high-precision face-machined sliding faces rotate axially in opposition. The sliding faces are pressed against each other by means of spring force, thus preventing the opening of the seal. The seal faces are statically sealed against the housing and the shaft by secondary seals (O-rings). With the entry of the pumped medium into the minimal sealing gap a lubricating film is generated and the sealing effect is thus obtained.
The design, arrangement and combination of materials of the seal is basically determined by pressure, temperature, speed of rotation and quality of the pumped medium. Shaft diameters of 5...500 mm, pressures from 10 torr ....250 bar, temperatures from -200°C... +450°C and sliding velocities up to 150 m/s limit the operating range of mechanical seals. Additional seal supply systems or buffer fluid systems may be required, dependent on the mode of operation, the quality of the medium and the seal arrangement..
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Standard balanced mechanical seal with a single spring washer and pentagonal drive.
The areas of applications are huge due to the protection design for the spring washer: pumps conveying slurries for the sugar industry, paper industry, extracting industry, for heavy industries, all simple assemblies possible (cartridge, tandem, quench, etc ...).
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Chesterton’s 442 Split Mechanical Seal construction enables the seal to handle pressures three and one-half times higher than conventional split seals. The 442 is the only split seal specifically designed to be able to withstand vacuum in the stuffing box. This makes it the ideal seal for main and auxiliary condensate pumps.
Fast, Easy Installation
The 442 provides the sealing capability of traditional mechanical seals without the need to disassemble and realign the pump. All parts are split to slip around the shaft and assemble in place. The 442 seal is a dramatic time saver with fast, easy installation, plus it can be rebuilt quickly and easily. Downtime is minimized and driver/equipment alignment is eliminated.
Main Features:
Fast, easy installation without the need for pump disassembly.
Specifically designed to seal in applications where stuffing box is in a vacuum.
Fast, economical and easy rebuild of seal in the field eliminates the need for a spare seal.
Adjustable gland fits 2, 3 or 4 bolt patterns.
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Type 18 High-Pressure Seal
High-pressure, high-speed balanced cartridge seal for boiler feed applications.
Features
* High-pressure, high-speed stationary design for clean product
* Repaired at the factory or repair center.
Type 19 Mixer Seal
Double concentric cartridge seal
Features
* Designed with stationary springs for vertical mixer and other equipment with excessive radial shaft movement
* Can handle up to 0.125" (3.18 mm)TIR
* Repair at factory or repair center.
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Type 28 compressor dry-running gas seals have been the industry standard since early 1970 for gas-handling turbomachinery. Utilizing John Crane's patented spiral groove pattern, these seals are non-contacting in operation. During dynamic operation, the mating ring/seat and primary ring/face maintain a sealing gap of approximately 0.0002 in./5 microns, thereby eliminating wear. These seals eliminate seal oil contamination and reduce maintenance costs and downtime. Single, double opposed, and tandem cartridge seals are capable of handling a wide variety of gas sealing applications in the gas collection/transmission, refining, chemical and petrochemical processing industries.
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Chesterton’s 442M Split Mechanical Seal
The 442M provides the sealing capability of traditional mechanical seals without the need to disassemble and realign the pump. All parts are split to slip around the shaft and assemble in place. The 442 seal is a dramatic time saver with fast, easy installation, plus it can be rebuilt quickly and easily. Downtime is minimized and driver/equipment alignment is eliminated.
Main Features:
Fast, easy installation without the need for pump disassembly.
Fast, economical and easy rebuild of seal in the field eliminates the need for a spare seal.
The 442M avoids equipment dis-assembly during seal change.
Designed to handle the high runout conditions of mixers and agitators.
Patented automatic centering.
Exclusive design features ensure maximum performance.
Compact seal design occupies minimum space.
The ultimate split seal for mixers, agitators and specialty equipment .
ISO 9001 CERTIFIED
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Chesterton’s 442M Split Mechanical Seal
External springs are non-clogging and act as a wear gauge.
Double captured gland and holder gaskets resist extrusion.
Narrow face rotates to minimize wiping effect.
Patented centering buttons provide automatic centering and are FDA approved for sanitary conditions.
Captive shaft O-ring makes installation simple.
Dual flush ports allow piping from either side.
Designed specifically with high-runout equipment in mind
Split design allows quick, economical installation without equipment disassembly.
Economical repair kits allow the seal to be field refurbished
442M split mixer seal is specifically designed to reliably perform in services which routinely exhibit large amounts of radial shaft runout.
Large internal clearances allow radial shaft movement without damaging seal components.
Patented Automatic Centering Maximum radial runout performance demands perfect centering.
Unique centering "buttons" positively center the gland about the rotating element. This ensures maximum radial travel in all directions. Face "Wiping" is minimized in rotating narrow face designs, if the equipment shaft is not concentric to the stuffing box bore, particles are prevented from being transported across seal face wear track due to the wiping action created. The lapped seal faces are nprotected from damage.
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