Product features and advantages
External‑mounted, single‑end, balanced type, multiple springs, PTFE bellows, arbitrary rotation direction. Springs can be equipped with protective cover (Type WB2). Compliant with EN 12756 (DIN 24960) and ISO 3069 standards.
1. Modular design allows all wearing parts to be interchangeable, ensuring better stability in mass production and higher cost performance.
2. With modular design, production is used to replace stocking, and the delivery time is shortened by 50% compared with the original design.
3. Dry-running products feature higher cleanliness, enhanced safety and lower noise; they replace imported mechanical seals and offer better cost performance.
Parameter
| Shaft diameter range |
30~65 mm (standard sizes, customizable) |
| Work pressure |
≤0.5 MPa (vacuum ~5 bar, overpressure strictly prohibited) |
| Medium temperature |
-10 ℃~+100 ℃ (limited by PTFE bellows; higher or lower temperature requires material upgrade or cooling arrangement) |
| Surface speed |
<15 m/s (corresponding speed converted by shaft diameter, generally ≤3000 r/min) |
| Axial displacement |
±0.5 mm, radial run-out ≤0.06 mm |
| Face materials |
SiC/SiC, SiC/TC, carbon graphite/TC (selected according to media corrosion and abrasion resistance) |
| Secondary seal |
PTFE bellows + O-ring (NBR/EPDM/FKM optional) |
| Metal parts |
SS304/SS316 stainless steel |
Applicable operating conditions and media
- Typical media: Highly corrosive media (e.g., concentrated acids, concentrated alkalis, organic solvents, salt spray, chlorine-containing media), clean or low-abrasion chemical fluids (particles ≤ 50 mg/L, particle size ≤ 5 μm); not suitable for highly abrasive (high solid content), high-viscosity or fiber-containing applications.
- Applicable equipment: Corrosion-resistant centrifugal pumps, chemical process pumps, pickling pumps, electroplating circulation pumps, laboratory pumps (internally mounted installation, PTFE bellows suitable for strong corrosion).
- Industrial applications: Fine chemical, pharmaceutical, electroplating, pickling, semiconductor cleaning, water treatment (highly corrosive chemical dosing), fluorine chemical industry and other highly corrosive environments.
- Limitations:
- End-face lubrication must be ensured; dry running is strictly prohibited. A flushing plan (PLAN 11/21) shall be provided if necessary.
- When pressure > 0.4 MPa or temperature > 80 ℃, cooling / flushing is recommended, or material upgrade (e.g., FKM + SiC/SiC combination) is adopted.
- When particle content exceeds the standard, a filtering device shall be installed to avoid bellows blockage or end-face wear.
Application areas/scenarios
– Industrial water pumps (clean water pumps, cooling water pumps, circulating water pumps)
– Chemical pumps (for conveying weak acid and alkali solutions)
– Sewage pumps (municipal sewage treatment, industrial wastewater treatment)
– Petrochemical equipment (for conveying oils and light hydrocarbon media)
– Food & beverage, pharmaceutical industries (materials meeting hygienic standards are available)
FAQ
- Leakage (most common issue)
- Leakage at static sealing face: Check if the stationary seal gasket (O‑ring, V‑ring) is aged, deformed or mismatched in size. Replace it with a media‑resistant and temperature‑resistant gasket of the same specification. If the fit clearance between the stationary ring and the gland is too large, re‑machine or replace the stationary ring.
- Leakage at dynamic sealing face: Inspect the sealing end faces of the rotating and stationary rings for scratches, wear or chipping. Minor scratches can be repaired by lapping; replace the seal rings directly if severely damaged. Also verify the spring compression: add gaskets if insufficient, reduce gaskets if excessive.
- Leakage at shaft sleeve / shaft fit: Check for damage to the shaft sleeve gasket, or excessive fit clearance between shaft sleeve and shaft. Replace the gasket or re‑grind the shaft sleeve.
- Abnormal wear
- Excessive end face wear: Install a filter if caused by particulate impurities in the medium. For insufficient lubrication, use self‑lubricating seals such as impregnated graphite rings, or introduce external flushing liquid (e.g. clean same medium).
- Shaft sleeve wear: Replace the shaft sleeve with wear‑resistant material, and adjust the concentricity between the seal chamber and the shaft to avoid eccentric wear.
- Overheating and Burning
- Excessively high temperature in seal chamber: Check if the cooling system is clogged and clean the cooling lines. If the medium temperature is inherently high, use high-temperature resistant seal materials (such as silicon nitride ceramic rings and fluororubber gaskets).
- Poor end-face contact due to spring failure: Replace fatigued or corroded springs, select corrosion-resistant spring materials such as stainless steel, and ensure uniform spring compression.
- Vibration and Abnormal Noise
- Misalignment: Recalibrate the concentricity between the pump shaft and motor shaft, and adjust the radial runout of the seal chamber and shaft to within allowable limits.
- Loose parts: Check whether the gland bolts and drive pins are loose, tighten the bolts evenly to the specified torque, and replace worn drive pins.
- Short Service Life of Seals
- Mismatch between material and medium: Replace seal materials according to medium characteristics (e.g., Hastelloy and PTFE for corrosive media; silicon carbide for high-temperature media).
- Improper installation: Operate in strict accordance with installation specifications, avoid impact or scratches on the seal pair end faces, and ensure no impurities enter the seal chamber during installation.
