🔷 Key Features

• Made with PTFE (Teflon) bellows for superior chemical resistance
• Non-metallic design — suitable for highly corrosive environments
• No dynamic O-ring → minimal shaft wear
• Self-cleaning bellows reduces clogging
• Handles toxic, volatile, and reactive fluids safely
• Low friction and smooth operation
• Maintenance-friendly construction

⚙️ Main Components

• PTFE Bellows — provides flexibility and sealing force
• Rotary Seal Face — rotates with the shaft
• Stationary Face (Seat) — fixed in housing
• Gland Plate / Housing — mounts seal to equipment
• Drive Mechanism — transmits torque to rotary face
• Secondary Seals (if required) — static sealing

💧 Working Principle

The flexible PTFE bellows acts as both the spring and secondary seal. It applies axial force that keeps the rotating and stationary faces in contact. A thin fluid film forms between the faces, preventing leakage while reducing friction and wear.

🧪 Materials of Construction

Metal Parts: SS304, SS316, Hastelloy (optional)
Bellows: Virgin PTFE / Filled PTFE
Seal Faces: Carbon, Silicon Carbide, Tungsten Carbide
Elastomers (if used): PTFE / Viton / EPDM

🔹 Types of Teflon Bellow Seals

• Single PTFE Bellow Seal

• For general corrosive applications
• Cost-effective solution

• Double PTFE Bellow Seal

• For highly hazardous or toxic fluids
• Uses barrier fluid for zero leakage

• Balanced PTFE Bellow Seal

• Suitable for higher pressure conditions
• Reduced face wear

• Unbalanced PTFE Bellow Seal

• For low to moderate pressure services
• Economical design

🏭 Typical Applications

• Chemical processing plants
• Acid and alkali transfer pumps
• Fertilizer industry
• Pharmaceutical manufacturing
• Pesticide & agrochemical plants
• Petrochemical industry
• Effluent treatment systems
• Dye and pigment manufacturing

⭐ Advantages

• Excellent resistance to corrosion and chemicals
• Ideal for aggressive and hazardous fluids
• No spring corrosion or clogging issues
• Low maintenance requirements
• Long service life in harsh environments
• Suitable for high purity applications

⚠️ Limitations

• Not suitable for very high pressure compared to metal bellows seals
• PTFE has lower mechanical strength than metals
• Temperature limits depend on PTFE grade
• Requires proper installation to avoid bellows damage

🏢 Why Choose KP Engineering Teflon Bellow Seals?

• Precision-engineered for reliability
• High-quality PTFE materials
• Designed for Indian industrial conditions
• Custom sizes available for various pump models
• Strict quality control and testing
• Competitive pricing with dependable performance

📌 Industries Served

• Chemical & Petrochemical
• Pharmaceuticals
• Fertilizers & Agrochemicals
• Food & Specialty Chemicals
• Water & Effluent Treatment
• Textile & Dye Manufacturing