112 Series
Category:National Standard Seal Series
1. Internal single-end mechanical seal,
2. External spring
3. Non-equilibrium type
Detailed introduction
The 112 series mechanical seal is a classic single-face, unbalanced sealing solution specifically designed for applications involving clean water, wastewater, and moderately corrosive media. With its compact structure and stable performance, it is well-suited for equipment such as multistage pumps and represents a cost-effective sealing option for industrial and chemical pumps.
✅ Core Parameters and Performance
Operating parameters: Pressure ≤ 1.2 MPa (some specifications reach 1.6 MPa); temperature -20℃ to 180℃ (some specifications reach 230℃); linear velocity ≤ 15 m/s (some specifications ≤ 10 m/s); axial runout ±1.0 mm.
Corrosion- and wear-resistant materials: The friction pair can be configured with either silicon carbide/graphite or tungsten carbide/tungsten carbide combinations, while the substrate is made of stainless steel. This material combination is resistant to water, oils, acids, alkalis, salts, organic solvents, and media containing solid particles.
High reliability and low leakage: Exquisitely designed, with stable operation and suitable for continuous use; low leakage rate meets environmental protection and process requirements.
✅ Structural features
Single-face unbalanced type: simple structure, cost-controlled, perfectly suited for medium- and low-pressure operating conditions.
Fork-drive upgrade: The drive is reliable and slip-free, effectively addressing the transmission failure issues commonly encountered in traditional 112 mechanical seals for multistage pumps—issues caused by wear on the balance disc and axial movement of the rotor.
Arbitrary rotation direction design: Compatible with both forward and reverse rotation of the device, installation is not restricted by direction, and assembly is convenient.
Modular design: Easy to disassemble and maintain, reducing later operation and maintenance costs.
✅ Applicable scenarios
Typical media: clear water, wastewater, oils, acid-alkali-salt solutions, organic solvents, and media containing solid particles.
Covered industries: Chemical industry—acid, alkali, and salt slurry transfer pumps; water treatment industry—clear water pumps, sewage pumps, and submersible pumps; water supply and drainage equipment for the power, hydraulic, and steel industries; high-fiber and high-viscosity medium handling equipment for the papermaking, coal chemical, fertilizer, and aluminum production industries.
🔥 Preferred Sealing Solutions for Medium- and Low-Pressure Applications
The 112 series mechanical seals, with their compact design and stable performance, strike a perfect balance between practicality and cost-effectiveness, making them ideally suited to meet the sealing requirements of both conventional and complex media across a wide range of industries, thereby ensuring the reliable operation of industrial equipment.
Applicable host
Product Features
Use parameters
1. Media: Mildly corrosive media such as water, oil, acids, alkalis, organic solvents, etc.; media containing hard particles, crystals, or high-viscosity media are also permitted.
2. Operating pressure: 0~1.2 MPa
3. Operating temperature: -30~180°C
4. Linear velocity: ≤15 m/s
Keywords：112 Series
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Seal Support Systems
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Plan 23
Core positioning: A single-face seal self-flushing solution specifically designed for hot-water pumps. The medium is guided out of the self-sealing cavity, cooled, and then returned to the sealing face, achieving integrated self-circulation for flushing and cooling without the need for additional medium replenishment.
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Plan 53A
Reason for adoption: Isolate the process fluid. Zero discharge of the process fluid.
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Plan 53B
Reason for adoption: Isolation of process liquids; zero discharge of process fluids; pressure exceeding the 53A scheme.
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Plan 53C
Reason for adoption: Isolate the process fluid. Achieve zero discharge of the process fluid. Pressure exceeds the 53A design specification. Dynamically monitor system pressure.
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