Single Dry Running Agitator Mechanical Seal with Bearing Support

Product overview; 

The SD905 is a single dry running mechanical seal with an integrated bearing assembly, engineered for agitators, mixers, reactors, blowers, and similar rotating equipment where reliable sealing is required without external barrier‑fluid circulation. The integrated bearing support arrangement helps stabilize the shaft, reduce radial movement, and maintain controlled seal‑face alignment under moderate vibration, runout, and shaft‑deflection conditions. 

 

Designed for non‑toxic and non‑hazardous media, the SD905 is suitable for dry, vapour, powder, splash, and low‑pressure process environments commonly found in chemical, petrochemical, pharmaceutical, and food & beverage plants. Its compact, serviceable construction supports simplified installation, reduced maintenance intervention, and dependable operation in both top‑entry and side‑entry equipment configurations, offering flexibility for a wide range of mixer and reactor geometries.  

 

By eliminating auxiliary systems such as barrier‑fluid circuits or cooling units, dry mechanical seals help reduce the risk of product contamination, lower utility consumption, and simplify system maintenance. Their clean, efficient, and contamination‑free operation makes them particularly suitable for sensitive processes in the chemical, pharmaceutical, and food industries, where product integrity is critical. 

  

 

Technical Key features; 

• Balanced and unbalanced designs are available to suit varying pressure and process conditions. 

• Low-maintenance construction reduces auxiliary-system dependency and simplifies plant operation. 

• Cost-effective with rapid delivery offers a practical balance of performance, affordability, and short lead times. 

• Single dry-running seal design eliminates the need for external barrier-fluid systems in suitable non-toxic services. 

• Integrated bearing support improves shaft stability and reduces seal-face disturbance caused by runout or vibration. 

• Carbon-based dry-running face option supports controlled friction and heat generation during dry operation. 

• No cooling or lubrication required in the seal chamber, reducing system complexity and operational overhead. 

• Bi-directional capability allows operation independent of shaft rotation direction, subject to equipment configuration. 

• Material flexibility ensures compatibility with chemical, pharmaceutical, and food & beverage process environments. 

• Top and side entry compatibility provides broad installation flexibility for different shaft-entry arrangements. 

• Externally mounted design allows easy inspection, operation, and maintenance without disassembling the process equipment. 

• Optional bearing assembly is available with or without an integrated bearing to suit specific mechanical-load and alignment requirements. 

• Factory assembled and tested units are pre-assembled and rigorously checked to ensure consistent performance upon installation. 

• Directionally independent operation provides reliable performance regardless of shaft rotation direction, improving application versatility. 

• Rotary multi-spring mechanism ensures uniform axial load on the sealing faces, promoting stable performance and extended seal life. 

• Single-seal configuration delivers dependable sealing performance in dry-running applications without the complexity of dual-seal arrangements. 

• Flexible construction options are available in non-cartridge, semi-cartridge, and cartridge formats to match installation preferences and standards. 

• Compact assembly configuration is suitable for agitators, mixers, reactors, blowers, and other process equipment with limited installation space. 

• Simplified installation and maintenance support straightforward assembly and servicing, minimizing downtime and reducing maintenance costs. 

 

Service Overview; 

Parameter	Value
Equipment	Agitators, mixers, reactors, blowers, vessels, and similar rotating equipment
Fluid	Non-toxic liquids, vapors, powders, light chemical media, food-grade media, and low-hazard process fluids
Service Nature	Dry running, vapor phase, splash service, low-pressure sealing, intermittent product contact
Operating Mode	Continuous or batch operation; top-entry, side-entry, or custom-mounted equipment

 

Specifications; 

Item	Min	Max	Typical / Notes
Size	20 mm (0.750”)	300 mm (12.000”)	Larger sizes available on request for agitator shafts
Pressure	Vacuum	10 bar (145 psi)	Recommended for non-toxic, low-to-moderate pressure service
Temperature	-20°C (-4°F)	+200°C (+392°F)	Dependent on elastomer, face, and hardware selection
Speed	—	500 rpm	Typical agitator / mixer duty; higher speeds subject to design review

 

Materials; 

Component	Standard Material	Optional Material	Comment
Seal Faces	Carbon Graphite vs Silicon Carbide	Carbon vs Tungsten Carbide, Resin-Impregnated Carbon	Dry running face pairing selected for low heat generation and wear control
Elastomers / Secondary Seals	FKM / Viton	EPDM, PTFE, FEP-Encapsulated FKM, Food-Grade Elastomers	Selection based on media, temperature, and hygiene requirements
Metal Parts / Hardware	SS 316	SS 304, Hastelloy C, Alloy 20, Duplex SS	Corrosion resistance selected to suit chemical or hygienic service
Bearing Support Components	SS 316 Housing with Anti-Friction Bearing	SS 304 / Special Alloy Housing, High-Temperature Bearing Options	Supports shaft stability and reduces radial seal loading

 

Applications; 

• Pharmaceutical mixers, reactors, and blending vessels. 

• Reactors handling vapors, powders, or splash-zone liquids. 

• Top-entry and side-entry agitators in batch processing systems. 

• Food & beverage mixing equipment requiring clean, reliable sealing. 

• Chemical and petrochemical agitators handling non-toxic process media. 

• General industrial mixers where external flush or barrier systems are not preferred. 

• Blowers and light-duty rotating equipment operating in dry or low-pressure service. 

 

 

Operating Limits; 

Parameter	Value
Pressure	Vacuum to 10 bar (145 psi)
Temperature	-20°C to +200°C (-4°F to +392°F)
Speed	Up to 500 rpm
Size Range	20 mm to 300 mm (0.750” to 12.000”)

 

Engineering verification note; 

Operating limits and material combinations above are inferred using conservative industry-standard values for dry running agitator mechanical seals. Final selection should be verified against actual shaft size, vessel pressure, temperature, media properties, duty cycle, runout, bearing span, and installation drawing.