Product overview;
The ED945/ED950 is a double mechanical seal assembly engineered for rotating equipment where shaft stability, containment reliability, and process safety are critical. Designed with an integrated bearing assembly, the unit provides improved shaft guidance and seal-face alignment in top-, bottom-, and side-entry equipment, making it especially effective in applications where agitator deflection, vessel pressure, runout, or media viscosity can affect seal performance.
Available in balanced and unbalanced configurations, the ED945/ED950 is suitable for pressurized barrier- or buffer-fluid operation in hazardous, toxic, sticky, viscous, crystallizing, polymerizing, and solvent-based services. The double-seal arrangement delivers enhanced leakage control and process isolation for reactors, mixers, glass-lined agitators, chemical blending tanks, pharmaceutical vessels, food-grade processing equipment, and classified-area mixing systems.
This pre-assembled, factory-tested cartridge seal is designed for ease of installation, dependable operation, and reduced downtime. Its robust construction and material options make it highly suitable for chemical, pharmaceutical, food, and biotech applications where leak-tight containment is critical. An ATEX-compliant design can be provided as an option for use in potentially explosive atmospheres, with operating limits determined by application-specific explosion-protection and monitoring requirements.
Technical key Features;
- Bi-directional operation suitable for both clockwise and counter-clockwise rotating shafts.
- Balanced and unbalanced designs available to meet varying pressure conditions and fluid characteristics.
- Liquid-lubricated and cooling-system-ready construction for high-duty or thermally sensitive applications.
- Barrier- and buffer-fluid compatible design for improved environmental control and leakage management.
- Double seal arrangement for improved containment of hazardous, toxic, volatile, and high-value process media.
- Suitable for top-, bottom-, and side-entry equipment, including reactors, blending tanks, and process mixers.
- Balanced and unbalanced variants allow selection based on pressure, media behavior, and operating severity.
- Explosion-safe design option available for use in ATEX-rated zones, subject to configuration and certification requirements.
- Integrated bearing assembly helps stabilize shaft movement and reduce seal-face disturbance in agitator and mixer duties.
- Dual pressurized seal arrangement to protect product integrity and reduce leakage risk in hazardous and sensitive processes.
- Cartridge-type assembly supplied pre-set and pre-tested for easier installation, faster setup, and improved alignment accuracy.
- Wide material selection including high-performance alloys, carbon, silicon carbide, and PTFE-based options for aggressive media.
- Customizable configurations with non-standard sizes, special materials, and application-specific designs available on request.
- Configurable materials and elastomers for chemical, pharmaceutical, food-grade, petrochemical, and hygienic applications.
- Top-, bottom-, and side-entry compatibility for a wide range of installation orientations in mixing, blending, and agitation systems.
- Robust construction for viscous and sticky media, including polymer, resin, epoxy, hydrocarbon, and slurry-like process conditions.
- Multiple seal arrangement options including back-to-back, face-to-face, and tandem layouts for application-specific sealing strategies.
- Reverse-pressure capability at the inboard side to maintain sealing integrity in systems with fluctuating or reverse pressure conditions.
- Optional metal-free wetted parts to help prevent corrosion and media contamination in high-purity or chemically aggressive services.
- Externally mounted design for easier inspection, adjustment, and seal replacement without disturbing critical equipment components.
- Vacuum and pressure versatility for reliable performance under full vacuum, elevated pressures, and fluctuating operating conditions.
- Rotary multi-spring configuration for uniform face loading, shaft-deflection tolerance, and stable sealing efficiency under dynamic conditions.
- Factory assembled and pressure tested as a complete unit to support fast installation, reliable sealing performance, and minimal startup issues.
- Compatible with glass-lined reactors using chemically compatible, non-damaging materials to protect glass-lined surfaces in corrosive or sensitive environments.
- Integrated bearing assembly supports shaft stability in overhung and vertical configurations, especially important for bottom-entry or cantilever-mounted shafts.
Service Overview;
| Parameter | Value |
| Equipment | Top entry agitators, bottom entry mixers, side entry rotating equipment, reactors, blending tanks, process vessels |
| Fluid | Hydrocarbons, solvents, polymers, resins, epoxy, viscous media, sticky media, toxic chemicals, hazardous fluids, food-grade and pharmaceutical fluids |
| Service Nature | Hazardous, toxic, viscous, sticky, crystallizing, polymerizing, solvent-based, hygienic, and chemically aggressive services |
| Operating Mode | Double mechanical seal with barrier/buffer fluid system; suitable for continuous or batch process operation |
Specifications;
| Item | Min | Max | Typical/Notes |
| Size | 20 mm (0.750”) | 300 mm (12.000”) | Larger sizes on request for reactor and agitator shafts |
| Pressure | Full vacuum,
-1 bar(g) (-14.5 psi(g)) |
Up to 250 bars (g) (3,625 psi(g)) | Balanced configuration preferred for higher pressure and hazardous media |
| Temperature | -40°C (-40°F) | +250°C (+482°F) | Higher temperature options depend on elastomer, face, and barrier fluid selection |
| Speed | 10 rpm | 1,500 rpm | Subject to shaft size, bearing span, runout, and equipment configuration |
Materials;
| Component | Standard Material | Optional Material | Comment |
| Seal Faces | Carbon vs Silicon Carbide | Silicon Carbide vs Silicon Carbide, Tungsten Carbide vs Tungsten Carbide | Hard-face combinations recommended for abrasive, sticky, or crystallizing media |
| Secondary Seals | FKM / Viton | EPDM, PTFE, FEP-encapsulated FKM, Kalrez / FFKM | Selection depends on solvent, chemical, temperature, and food/pharma compatibility |
| Metal Parts | SS 316 / SS 316L | Hastelloy C, Alloy 20, Duplex SS, Titanium | For corrosive, pharmaceutical, petrochemical, and aggressive chemical duties |
| Springs & Drive Parts | SS 316 | Hastelloy C, Inconel | Non-product-contact or isolated spring arrangements available depending on design |
| Bearing Assembly | Bearing steel / MS / SS housing arrangement | Stainless steel, coated, or special alloy construction | Selected according to load, mounting orientation, and environmental exposure |
Applications;
- Plastic and chemical industry process mixers.
- Paint, resin, pigment, and solvent blending vessels.
- Pharmaceutical, bulk drug, and biochemistry process reactors.
- Glass-lined reactor agitators for top, bottom, or side entry service.
- Pulp and paper chemical preparation and additive mixing systems.
- Foodstuff processing, hygienic mixers, and sanitary rotating vessels.
- Hazardous and toxic applications requiring double seal containment.
- Electron epoxy, adhesive, sealant, and high-viscosity media processing.
- Petrochemical, refining, hydrocarbon, and polymerization processing equipment.
- ATEX / IECEx classified-area mixing systems, when supplied with suitable certification package.
Operating Limits;
| Parameter | Value |
| Pressure | Full vacuum to 250 bars (g) (-14.5 psi(g) to 3,625 psi(g)) |
| Temperature | -40°C to +250°C (-40°F to +482°F) |
| Speed | Up to 1,500 rpm |
| Size Range | 20 mm to 300 mm (0.750” to 12.000”) |
Engineering Note;
Operating limits and material selections above are engineering defaults for double agitator/reactor mechanical seal assemblies. Final values for ED945/ED950 should be verified against the actual seal drawing, vessel pressure, shaft size, runout, barrier fluid system, product chemistry, and certification requirements.
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