Parameter
| Structure |
Externally mounted, single-end face, multi-spring, unbalanced, sleeve/lug drive, internal flow design, anti-rotation pin positioning. |
| Pressure (MPa) |
≤1.0 MPa (10 bar), standard operating conditions; enhanced version up to 1.6 MPa (requires balancing modification). |
|
Temperature
|
-20～80℃ (NBR/FKM standard); FKM/PTFE reinforced to 120℃; high-temperature metal corrugated pipes can reach 150℃. |
|
Shaft Diameter
|
100 mm (MY100 corresponding specification), commonly compatible with 25-120 mm in the same series. |
|
Rotational Speed/Linear Velocity
|
≤3000 rpm, ≤10 m/s (up to 12 m/s for high wear-resistant materials) |
|
Common Material Combinations
|
Friction pairs: Graphite/Silicon Carbide (SiC), Graphite/Hard Carbide (WC); SiC-SiC is selected for strong abrasion.
Auxiliary seals: NBR (oil/water), FKM (fluororubber, acid and alkali resistant), EPDM (water/steam), PTFE (strong corrosion resistant).
Metal parts: 304/316L stainless steel; Hastelloy is available for special applications. |
Application areas/scenarios
Applicable Operating Conditions (Industrial and Mining)
1. Water Treatment: Municipal sewage, industrial wastewater, circulating water, seawater desalination; conveying clean water, acidic/alkaline water, and flocculant solutions containing trace particles (<1%).
2. Chemical/Pharmaceutical: Neutral corrosive media (methanol, ethanol, citric acid, phosphate, dilute acids and alkalis) with low to medium viscosity (≤3000 mPa·s).
3. Metallurgy/Electroplating: Cooling circulating water, pickling wastewater, and low-abrasive liquids containing heavy metal ions.
4. General Industry: Clean water, low-temperature hot water, hydraulic oil, lubricating oil, emulsions, and other non-corrosive, low-abrasive operating conditions.
Unapplicable Scenarios
– High abrasiveness (solid particles >5%, high-hardness slurry), strong 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): requires additional upgrade to SiC-SiC+FFKM+Hastelloy alloy. Easily crystallizes, has high viscosity (>5000 mPa·s), or contains long fibers (easily leads to spring jamming and end-face wear).
Supplementary Selection Recommendations
– Contains trace particles (0.5%～1%): Select graphite + SiC, with API Plan 11 flushing + filtration.
– Weak corrosion: FKM auxiliary seal; Strong corrosion: PTFE/FFKM + 316L metal parts.
– High temperature (80～120 ℃): Select high-temperature FKM or metal bellows structure, with a cooling solution.
FAQ
1. Leakage Issues (Most Common)
– Static sealing surface leakage: Check if the stationary ring seals (O-rings, V-rings) are aged, deformed, or missized. Replace with seals of the same specifications that are resistant to the medium and temperature. If the clearance between the stationary ring and the gland is too large, the stationary ring needs to be re-machined or replaced.
– Dynamic sealing surface leakage: Check the sealing end faces of the dynamic and stationary rings for scratches, wear, or chipping. Minor scratches can be repaired by grinding; for severe scratches, replace the sealing ring directly. Also, confirm if the spring compression is appropriate. If insufficient compression, add gaskets; if excessive compression, reduce the number of gaskets.
– Leakage at the bushing-shaft mating point: Check if the bushing seal is damaged or if the clearance between the bushing and the shaft is too large. Replace the seal or re-grind the bushing.
2. Abnormal Wear
– Excessive end face wear: If due to particulate impurities in the medium, a filter needs to be installed; if due to insufficient lubrication, a self-lubricating seal such as an impregnated graphite ring can be used, or an external flushing fluid (such as a clean liquid of the same medium) can be introduced.
– Shaft sleeve wear: Replace the shaft sleeve with one made of wear-resistant material, and adjust the coaxiality of the sealing cavity and the shaft to avoid uneven wear.
3. Overheating and Burnout
– Excessive sealing cavity temperature: Check for blockages in the cooling system and clean the cooling pipes; if the medium temperature itself is too high, use high-temperature resistant sealing materials (such as silicon nitride ceramic rings or fluororubber sealing rings).
– Spring failure leading to poor end-face contact: Replace fatigued or corroded springs with corrosion-resistant spring materials such as stainless steel, and ensure uniform spring compression.
4. Vibration and Abnormal Noise
– Coaxiality Deviation: Recalibrate the coaxiality of the pump shaft and motor shaft, adjust the radial runout of the sealing cavity and shaft, and control it within the allowable range.
– Loose Parts: Check whether the gland bolts and drive pins are loose, tighten the bolts evenly according to the specified torque, and replace worn drive pins.
5. Short lifespan of the seal
– Material mismatch with the medium: Replace the sealing material according to the characteristics of the medium (e.g., use Hastelloy or PTFE for corrosive media; use silicon carbide for high-temperature media).
– Improper installation: Strictly follow the installation specifications to avoid impact or scratches on the sealing surface, and ensure that no impurities enter the sealing cavity during installation.
