PEEK Balancing Disc Seal
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Core Summary: The PEEK balance disc seal manufactured by Dalian Allstar Material is a core component for multistage centrifugal pumps and compressors, achieving automatic compensation of rotor axial forces through precise differential pressure control. Utilizing the independently developed special material, this product significantly improves equipment volumetric efficiency and substantially extends the overall operation cycle.

Key Product Advantages:

  • Innovative Material & Structure: Features the independently developed  labyrinth seal special material, combined with an optimized tooth structure design.

  • High-Efficiency Sealing: Compared to traditional aluminum alloy seals, it reduces the sealing clearance by 40-60%, effectively improving equipment volumetric efficiency by 2-5%.

  • Superior Physical Durability: Offers excellent self-lubricating properties and impact resistance. The teeth will not permanently deform upon contacting the shaft, and it can withstand continuous working temperatures up to 260℃.

  • Cost Reduction & Extended Lifespan: Significantly reduces routine maintenance frequency, extending the stable equipment operation cycle to over 18,000 hours.

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Performance Technical Parameters

Working temperature range: Continuous 260°C, short-term peak 310°C
Pressure balancing capacity: Can balance axial force ≤80kN (customized according to disc diameter)
Sealing clearance: Radial 0.15-0.35mm (50% reduction compared to aluminum alloy), axial 0.025-0.075mm
Tooth parameters: Tooth height 1.5-3.5mm, tooth pitch 3-8mm, tooth tip angle 60°-90°
Leakage rate: ≤0.5% rated flow (at design pressure differential)
Surface roughness: Sealing surface Ra≤0.4μm, tooth surface Ra≤0.8μm
Dimensional tolerances: Inner diameter ±0.02mm, outer diameter ±0.03mm, flatness ≤0.015mm
Hardness: Shore D 88-92 (standard type), HRC 35-42 (30% carbon fiber reinforced type)
Strength: Compressive ≥130MPa, Flexural ≥165MPa, Impact ≥85kJ/m²
Applicable speed: ≤6000rpm (standard), ≤8000rpm (dynamic balance optimized)
Applicable disc diameter: Φ80-Φ500mm, supports customization up to Φ800mm

Application Fields

 

Multistage Centrifugal Pumps

Applied in boiler feedwater, petrochemical process, and mine drainage pumps. Reduces thrust bearing load, balancing residual axial force above 95%, extending bearing life 3 times.

 

Centrifugal Compressors

Used for shaft-end sealing of air compressors, process gas compressors. Automatically adjusting clearance through pressure differential, preventing gas leakage and improving efficiency 2-4%.

 

High-Pressure Water Injection

In oilfield water injection and seawater desalination. Withstands 15-35MPa working pressure. PEEK balance disc resists impact and wear, extending inspection cycles beyond 12 months.

 

Chemical Process Pumps

Conveying corrosive media (acids, alkalis). PEEK withstands 98% concentrated sulfuric acid and 50% sodium hydroxide from -40°C to +200°C, avoiding metal corrosion failure.

Common Failures & Remedial Measures

 

Increased Leakage

Causes: Sealing clearance >0.5mm due to wear; Axial shift >0.3mm; Rotor imbalance; Deposit accumulation.
Remedies: Replace disc if wear >0.2mm; adjust axial positioning; perform dynamic balancing (≤G2.5 grade); clean seal chamber.

 

Tooth Damage

Causes: Dry friction >300°C; Foreign objects >HRC 60; Instantaneous shaft deflection >0.15mm; Installation deformation.
Remedies: Ensure media lubrication before startup; install magnetic filter; check coupling alignment (radial ≤0.05mm); use special tooling.

 

Axial Force Imbalance

Causes: Balance piping blockage; Sensing tube leakage; Wear of impellers.
Remedies: Clean balance piping & orifice (3-8mm); replace joint seal; recalculate hydraulic axial force; adjust balance disc effective area.

Procurement Selection Essential Parameters

When ordering, purchasing engineers must provide:

  • ① Pump or compressor model and rotor shaft diameter size (such as Φ120h7)
  • ② Design axial force value (unit kN) and direction
  • ③ Working media characteristics (name, temperature, pressure, pH value, particle content)
  • ④ Seal chamber dimensions at balance disc installation location
  • ⑤ Speed range and whether variable frequency speed control is used

Selection conditions: Mating shaft surface requires hardening treatment (≥HRC 45, roughness ≤Ra0.6μm). Balance disc mounting end face flatness ≤0.01mm. Pump performance curve data must be provided.

If special tooth design or reinforced formulation is needed, please provide general assembly drawings. Our technical team will provide a 3D model confirmation within 48 hours.

FAQ – Frequently Asked Questions

Q1: What advantages does PEEK balance disc seal have compared to aluminum alloy?
① Sealing clearance reduced by 50%, improving volumetric efficiency; ② Self-lubricating properties reduce friction coefficient by 40%; ③ Strong corrosion resistance in acidic/alkaline media (aluminum easily corrodes at pH<4 or >10); ④ Self-recovers after collision without permanent deformation; ⑤ Wide temp range up to 260°C.
Q2: How to determine the effective area of balance disc?
Effective area = π/4 × (D_outer² – D_inner²). Must be determined according to hydraulic calculation of residual axial force and balance chamber pressure differential. General safety factor is 1.1-1.3, ensuring axial force biases toward suction side by 0.2-0.5mm throughout the operating range.
Q3: What is the service life of balance disc seal?
Under normal conditions, service life can reach 3-5 years (18,000-30,000 hours). Life mainly depends on wear rate (clean water approx 0.03mm/1000h, sand-containing media approx 0.15mm/1000h), start-stop frequency, and maintenance quality. Check clearance every 6000 hours.
Q4: What should be noted during installation?
① Clean seal chamber and shaft surface; ② Use torque wrench (diagonal cross method, error ≤5%); ③ Measure radial/axial clearance, max-min difference ≤0.05mm; ④ Manually rotate shaft after assembly; ⑤ Inject liquid to avoid dry friction before initial startup.
Q5: Can it be used for media containing solid particles?
Yes, if Particle hardness <Shore D 80, concentration ≤500mg/L, and particle size <1/3 of seal clearance. For sand/coal powder, we recommend: 30% CF reinforced PEEK, increasing clearance to 0.4-0.6mm, matching with cemented carbide shaft sleeve, and installing a cyclone separator.
Q6: How to determine if balance disc needs replacement?
Replace when: ① Leakage exceeds design value by 3 times; ② Measured clearance exceeds initial value by 2 times; ③ Tooth wear depth >50%; ④ Sudden increase in vibration; ⑤ Bearing temp rises >15°C; ⑥ Power consumption increases >8%.
Q7: How to choose different tooth structure types?
① Straight tooth (90°): Low speed, low pressure (<2MPa); ② Inclined tooth (60-75°): Medium-high speed, medium pressure (2-6MPa), good sealing; ③ Sawtooth: Strong impact resistance, frequent start-stop; ④ Labyrinth multi-tooth: Optimal sealing for high speed/pressure (>6MPa), requires high machining precision.
Q8: How does PEEK balance disc seal coordinate with mechanical seal?
Balance disc balances axial force (90-95%), mechanical seal handles shaft-end leakage. Proper configuration reduces mechanical seal pressure to 0.3-0.8MPa, extending its life 3-5 times and reducing flush liquid consumption.

About Dalian Allstar Material

Dalian Allstar Material is a National High-Tech Enterprise focusing on PEEK and PI high-performance polymer research, development and manufacturing. The company has a complete material polymerization, modification and precision machining industrial chain, equipped with imported CNC five-axis machining centers and material performance testing laboratories.

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