Product features and advantages
Internal-mounted, single-end, single-spring, non-balanced, lug drive, arbitrary rotation direction, 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 |
Commonly 16–120 mm (e.g. 117U-25/40/50/65/80/100) |
| pressure |
Standard ≤ 1.6 MPa (16 bar); conventional selection ≤ 1.0 MPa is more reliable; forbidden for high vacuum (< 0.05 MPa) |
| Temperature(according to secondary seal) |
| NBR |
-20~80 ℃ |
| FKM (fluorine rubber) |
-20~180 ℃ |
| PTFE/FFKM |
-40~200 ℃ |
| Surface speed / rotational speed |
≤ 20 m/s (suitable for ≤ 3000 rpm; for shaft diameter > 80 mm, speed reduction to ≤ 18 m/s is recommended); axial run-out ± 0.5 mm |
| Common Material Combinations |
| Friction Pair |
Graphite/Silicon Carbide (SiC), Graphite/Tungsten Carbide (WC), SiC-SiC (highly abrasive service) |
| Auxiliary seal |
NBR (oil/water), FKM (acid and alkali resistant), EPDM (water/steam), PTFE (highly corrosive media) |
| Metal parts |
304/316L stainless steel; Hastelloy available for special working conditions |
Applicable working conditions
1.Water treatment: municipal sewage, industrial wastewater, circulating water, seawater desalination; clean water, acid-alkali water and flocculant solution with trace particles (<1%).
2.Chemical / pharmaceutical: neutral and corrosive media with low to medium viscosity (≤ 3000 mPa·s), such as methanol, ethanol, citric acid, phosphate, dilute acids and alkalis.
3.Metallurgy / electroplating: cooling circulating water, pickling wastewater, low-abrasion liquids containing heavy metal ions.
4.General industry: clean water, low-temperature hot water, hydraulic oil, lubricating oil, emulsion and other non-highly corrosive, low-abrasion applications.
Not applicable for:
- High abrasion (solid particles >5%, high-hardness slurry), high vacuum (< 0.05 MPa), ultra-high pressure (> 1.6 MPa), ultra-high temperature (> 150 ℃)
- Strongly corrosive media (concentrated hydrochloric acid, hydrofluoric acid, chlor-alkali solution): upgrade to SiC-SiC + FFKM + Hastelloy required
- Easily crystallizing, high viscosity (> 5000 mPa·s) or long-fiber containing media (may cause spring seizure and face wear)
Additional Selection Recommendations
- Trace particles (0.5%–1%): Use graphite + SiC, with API Plan 11 flushing and filtration
- Weakly corrosive service: FKM secondary seal; strongly corrosive service: PTFE/FFKM + 316L metal parts
- High temperature (80–120 ℃): Adopt high-temperature FKM or metal bellows structure with cooling plan
Application areas/scenarios
1. Water treatment / Environmental protection: municipal sewage, industrial wastewater, circulating water, clean water, seawater, aqueous media with trace particles (<1%), low abrasion
2. Petrochemical / Pharmaceutical: oils, solvents, methanol, ethanol, acetone, dilute acids and alkalis, salt solutions, medical liquids, syrup and other neutral to weakly corrosive, non‑crystallizing, low‑viscosity media (≤3000 mPa·s)
3. General industry: clean water pumps, pipeline pumps, chemical centrifugal pumps, screw pumps, oil pumps, papermaking equipment, etc., suitable for conventional working conditions without severe abrasion, high vacuum or severe vibration
4. Food / Papermaking: clean process media, pulp black liquor (low abrasion); food‑grade materials (316L + PTFE + SiC) 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.