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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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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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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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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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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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- Patented "Zero Lash Positive Drive" design for appliance applications – eliminates seal squeal
- Global design capabilities
- In-house testing capability of pump and complete assembly
- Proprietary elastomer material formulations
- Custom mating faces
- Ability to produce other pump components
- Facility location: Bristol, NH
- Certifications: ISO 9002
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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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TYPE EB60 Mechanical seal of EB60 series are special purpose single coil balanced seals designed for use in media containing abrasive or solid particles.
Salient features:
* Spring completely protected from the product.
* Easily handle media containing abrasive particles and solids.
* Axial compensation of movement 1 mm.
* Perfect for standardization purposes.
Applications :
Specially used in paper industries, petrochemicals, petroleum refinery etc
Material :
Seal Faces : Ceramic/Sic/Carbon Vs Ceramic/RB Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 25 to 150mm
Pressure : up to 15 Bars
Temp. : -50 to 180°C
Speed : up to 25 m/s
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Type HS20 is Single-coil conical spring unbalanced seal.
The HS20 series seal are extremely rugged & reliable & therefore used in wide range of sealing applications.
These seals have very few parts & hence can be easily assembled or dismantled. The seal arrangement does not warrant any modification even in case of conversion from gland packing.
The compact design eliminates the requirement of extra radial & axial space for its installation.
Applications :
Generally used for handling corrosive chemicals, hydrocarbons, general & light chemicals.
Material :
Seal Faces : Sic/carbon Vs Ceramic/Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 10 to 100mm
Pressure : up to 10 Bars
Temp. : -20 to 180°C
Speed : up to 25 m/s
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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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TYPE FB1 & FB14 are pushers type balanced multi-coil spring seals generally used where high-pressure sealing is required.
Due to its compact radial & axial dimensions these seals required lower stuffing box space for installation.
These seals can be provided with single, double or tandem arrangement with external seal support systems & devices.
Applications :
Generally used in Petrochemicals, Petroleum refinery, Light Hydrocarbons & General Industrial fluids.
Material :
Seal Faces : Carbon Vs Ceramic/Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 14 to 150mm
Pressure : up to 30 Bars
Temp. : -50 to 280°C
Speed : up to 25 m
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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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HR20 Type HR20 is externally mounted internally balanced multi-coil spring seal.
The unique feature of this type of seal is that, it eliminates the shaft step or sleeves for balancing.
These seals are externally mounted & hence the metal parts including the springs do not come in contact with the circulating media & therefore can be use for corrosive or abrasive media. sealing.
The compact design eliminates the requirement of extra radial & axial
space for its installation.
Applications :
Generally used for handling corrosive chemicals, hydrocarbons, general & light chemicals.
Material :
Seal Faces : Sic/carbon Vs Ceramic/Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 10 to 100mm
Pressure : up to 10 Bars
Temp. : -50 to 180°C
Speed : up to 25 m/s
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Type MB1 is Inherently balanced metal bellow seal. This seals are independent of direction of rotation.
The unique feature of this type of seal is that, there is no dynamic 'O' rings and therefore it will never hang up or damage the shaft and sleeve, it also has an ability to handle corrosive as well as abrasive & viscous media.
These seals have self-cleaning & non-clogging construction. With selection of special bellow material it can be used in highly corrosive media.
Applications :
Generally used for handling highly corrosive chemicals, high Temperature applications, petroleum refinery etc.
Material :
Seal Faces : carbon/TC Vs Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Bellow Material :
* Tatanium
* AM350
* Alloy C 276
* Alloy 20
* Inconel 625
Operating Limits :
Shaft Dia. : 19 to 100mm
Pressure : up to 15 Bars
Temp. : -50 to 350°C
Speed : up to 25 m/s
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TYPE F1 & F14 are general-purpose multi-coil spring unbalanced seals. Designated as F1 & F14 for the unbalanced Versions with 'O' Ring & PTFE wedge respectively.
Shaft fretting is minimized due to lower spring loads provided through wedge or 'O' Rings, occupies less stuffing box area due to its narrow cross-section & compact design.
These Seals can be easily assemble of dismantled through circlip provided & can be change to Balance version of its type merely by changing the carbon face only & can be provided with single, double or tandem arrangement with external seal support systems & devices
Applications :
Generally used in Petrochemicals, Light Hydrocarbons & General Industrial fluids.
Material :
Seal Faces : Carbon Vs Ceramic/Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 14 to 150mm
Pressure : up to 10 Bars
Temp. : -50 to 280°C
Speed : up to 25 m
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Type HS25 are most commonly used rubber bellow seal, Due to its compact design it can be easily mounted.
Type HS25 has a unique rubber bellow secondary seal, which provides a high degree of axial flexibility to compensate for lack of concentricity of the shaft & misalignment & wear due to thrust movement of the shaft.
The seal can be use regardless of direction of rotation, since the driving torque is not transmitted through the coil spring, The required driving torque is enhanced through the unique rubber bellow which fits on the shaft. There are no bonded Joints and all the face materials are interchangeable without having to modify any dimensions.
Applications :
Generally used in sewage applications, waste water pumps, & fuel injection pumps.
Material :
Seal Faces : Carbon Vs Ceramic/Sic/TC
Secondary Seals : Nitrile/ Neoprene/Viton
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 10 to 100mm
Pressure : up to 10 Bars
Temp. : -20 to 150°C
Speed : up to 25 m/s
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H15/H16 Are single coil spring unbalanced seals, these seals are simple in design & reliable & rugged enough for the most difficult applications.
Designated as H15 & H16 for 'O' Rings & 'V' Packing used as Secondary seals respectively.
Special notches enhance the required driving torque & hence the seal is independent of direction of rotation. Non-clogging spring design enables these seals to be reliably used in situations involving abrasive, corrosive & viscous fluids generally handled by high Temperature pumps.
Applications :
Generally used in refineries, fertilizers, nuclear plants & petroleum pipelines.
Material :
Seal Faces : Carbon/TC/Sic. Vs Ceramic/RB Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 25 to 150mm
Pressure : up to 10 Bars
Temp. : -50 to 280°C
Speed : up to 15 m/s
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Type B76 & B76W are single coil balanced mechanical seals, reliable & rugged enough for variety of applications.
Designated as B76 & B76W for 'O' Ring & PTFE wedge type Secondary Seals respectively. The balanced & unbalanced version can just be obtained by simply changing the carbon face assembled through circlip provided.
Non-clogging spring design enables these seals to be reliably used in situations involving abrasive, corrosive, and viscous media. generally handled by high-pressure pumps.
Applications :
Used in high pressure pumps, refineries, fertilizers, nuclear plants & petroleum products.
Material :
Seal Faces : Carbon Vs Sic./TC
Secondary Seals : Viton/PTFE/GFT
Metal Components : SS-316
Operating Limits :
Shaft Dia. : 10 to 150mm
Pressure : up to 30 Bars
Temp. : -50 to 180°C
Speed : up to 15 m/s
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Standard pressure tanks, manufactured in accordance with API 682 standards, can be supplied in various applications using circulation pumps and process instruments for controlling seal running parameters.
For heavy duty applications there are complete internal flushing and heating/cooling coils to cater for customer's requirements. Proper nitrogen gas pannels are available for dry-running mechanical seals.
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