Product Overview;
The ES915–ES920 is a single, pressurized, liquid‑lubricated mechanical seal series engineered specifically for top and side entry agitators, mixers, reactors, and similar rotating equipment. Supplied as a fully assembled cartridge‑type seal in either balanced or unbalanced configuration, it is designed for installations where the shaft is already supported by the machine bearings and no seal‑mounted bearing assembly is required.
Its compact construction enables reliable shaft sealing in equipment where installation space, runout, and shaft stability must be carefully managed, while the pressurized liquid film between the faces supports low leakage and stable operation in hazardous or environmentally sensitive duties. Delivered as a pre‑assembled, factory‑tested unit, the ES915–ES920 promotes rapid installation, reduced downtime, and consistent field performance in both new and retrofit applications.
Engineered for general process and specialty chemical service, the ES915–ES920 is suitable for clean to moderately viscous fluids, resins, polymers, coatings, pharmaceutical intermediates, food‑grade fluids, wastewater streams, and compatible process liquids. A wide range of body materials, face combinations, and elastomers can be specified to match vessel pressure, fluid characteristics, shaft size, and duty severity, making the series a cost‑efficient sealing solution for intermittent or continuous mixing duties in chemical, pharmaceutical, refinery, food, and broader process industries.
Technical key features;
- Multiple‑spring design for uniform face loading, stable sealing performance, and better tolerance of shaft movement.
- Balanced and unbalanced configurations to suit low, moderate, or higher vessel‑pressure duties and varying media characteristics.
- Bi‑directional operation, functioning independently of shaft rotation direction for easier installation and inventory management.
- Liquid‑lubricated operation with optional cooling arrangements to maintain optimal seal‑face conditions and extend seal life under demanding duties.
- Suitable for top and side entry equipment, including agitators, mixers, reactors, blenders, and process vessels (not intended for bottom‑entry drives).
- Externally mounted design for enhanced accessibility during installation, inspection, and service compared with complex bearing‑mounted seal assemblies.
- Cartridge construction supplied as a factory‑assembled and tested unit, minimizing installation errors, reducing commissioning time, and simplifying maintenance.
- Custom engineering available for non‑standard dimensions, exotic materials, and application‑specific configurations to meet particular plant or OEM requirements.
- Reliable process containment for chemicals, paints, coatings, resins, polymers, pharmaceutical fluids, food liquids, and wastewater in general‑process and specialty‑chemical applications.
- Single‑seal configuration designed for zero‑ or near‑zero‑leakage performance to support environmental containment and regulatory compliance in moderate to demanding process conditions.
- Single mechanical seal construction (without bearing assembly) for compact, economical, and serviceable shaft sealing where shaft support is already provided by the agitator, mixer, reactor, or vessel drive system.
- Wide material compatibility, with face and elastomer options including carbon, silicon carbide, tungsten carbide, PTFE, FKM, EPDM, stainless steels, and optional non‑metallic wetted parts to address corrosive or hygienic environments.
Service Overview;
| Parameter | Value |
| Equipment | Top-entry and side-entry agitators, reactors, mixers, vessels, blenders, and rotating process equipment |
| Fluid | Chemicals, plastics, paints, coatings, resins, polymers, pharmaceutical fluids, food-grade liquids, water, wastewater, and compatible process media |
| Service Nature | General process, moderate pressure, mixing, blending, reaction, transfer, and vessel sealing duty |
| Operating Mode | Intermittent or continuous rotation; suitable for batch and process plant operation |
Specifications;
| Item | Min | Max | Typical / Notes |
| Size | 20 mm (0.750”) | 300 mm (12.000”) | Larger sizes available on request |
| Pressure | Vacuum | 10 bar (145 psi) Unbalanced / 16 bar (232 psi) Balanced | Final limit depends on shaft size, face combination, and process fluid |
| Temperature | -40°C (-40°F) | +200°C (+392°F) | Elastomer-dependent; higher-temperature options on request |
| Speed | — | 150 rpm | Typical for agitator, mixer, reactor, and vessel service |
Materials;
| Component | Standard Material | Optional Material | Comment |
| Seal Faces | Carbon / Silicon Carbide | Tungsten Carbide / Silicon Carbide | Selected based on lubrication, abrasiveness, and chemical compatibility |
| Secondary Seals | FKM / EPDM | PTFE / FEP Encapsulated / FFKM | Based on chemical and temperature resistance |
| Metal Parts | SS 304 / SS 316 | Alloy 20 / Hastelloy / Duplex SS | For corrosive chemical, resin, refinery, or pharmaceutical service |
| Springs & Drive Parts | SS 316 | Hastelloy / Alloy Steel | Selected for corrosion resistance and mechanical duty |
Applications;
- Food and beverage mixing vessels.
- Pulp and paper processing equipment.
- Petrochemical and refinery process vessels.
- Water and wastewater treatment agitators.
- General process industry agitators and mixers.
- Pharmaceutical and bulk drug manufacturing equipment.
- Chemicals, paints, coatings, adhesives, and epoxy processing.
- Plastics, polymers, resins, and electronic encapsulation systems.
- Reactors, blenders, vessels, and all types of top and side entry rotating equipment.
Operating Limits;
| Parameter | Value |
| Pressure | Up to 10 bar (145 psi) Unbalanced / up to 16 bar (232 psi) Balanced |
| Temperature | -40°C to +200°C (-40°F to +392°F) |
| Speed | Up to 150 rpm |
| Size Range | 20 mm to 300 mm (0.750” to 12.000”); larger sizes on request |
Engineering Note;
Operating limits and material selections above are inferred standard engineering values for this seal category. Final ratings should be verified against ES915–ES920 drawings, shaft runout, vessel pressure, fluid compatibility, temperature, equipment bearing support, and actual installation conditions.
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