Two-Shaft Wafer Butterfly Valve | CF8 Disc & EPDM Seat | Worm Gear Operated

Product Overview:

Tianjin Worlds Valve Co., Ltd. offers a two-shaft wafer butterfly valve with a ductile iron body, CF8 stainless steel disc, and EPDM seat, operated by a worm gearbox. The two-shaft design eliminates a long through-shaft, simplifying maintenance and reducing seizure risk. Available from DN50 to DN600 with pressure ratings up to PN10/PN16/Class 150, this valve is ideal for water, HVAC, and general industrial applications. All materials--disc, seat, body, stem--are customizable for more aggressive media.

Introduction:

Product Name: Wafer Butterfly Valve  

Body Material: Ductile Iron  

Disc Material: Stainless Steel (304SS)

Seat Material: EPDM, NBR, VITON, PTFE... 

Connection Type: Wafer type connection

Size Range: DN50–DN600  

Pressure Rating:  

PN10 / PN16 / Class150 ... 

Top Flange: Available in ISO 5211 standard for direct actuator mounting  

Operating Temperature Range: -20℃ to 120℃ (eg: EPDM) 

Customization: All materials, dimensions, and pressure ratings can be modified according to customer requirements

Type: CBF03-TA01--Product Catalog

Key Features & Advantages：

1. Two-Shaft Design–Easy Maintenance & Reduced Seizure Risk  

The valve uses separate upper and lower shafts instead of a single through-shaft.

• Simplified Disassembly: Removing the upper stem does not require extracting the lower stem or disc, making inspection and seat replacement faster.

• Lower Galling Risk: In aggressive media, a long single shaft is more prone to corrosion and seizure; two short shafts reduce the exposed surface area and simplify replacement.

• Positive Torque Transmission: The upper and lower stems are securely coupled, ensuring reliable disc movement.



2. Worm Gear Operator – Effortless, Self-Locking Control  

The turbine-type gearbox is designed for smooth manual operation, especially on larger valves (DN200 and above).

• High Mechanical Advantage: The gearbox multiplies input torque, reducing handwheel effort significantly.

• Self-Locking Function: The worm gear holds the disc at any position without creeping – no need for additional brakes.

• Clear Position Indication: A visual indicator on the gear housing shows open, closed, or intermediate positions.



3. CF8 Stainless Steel Disc & EPDM Seat – Proven for Water & HVAC  

The standard material combination is well-suited for clean water, treated water, and mild fluids.

• CF8 (304) Disc: Offers good corrosion resistance, strength, and ductility at a cost-effective price.

• EPDM Seat: Provides bubble-tight shut-off, resists water, steam, and ozone, with a wide temperature range (-20°C to +120°C).

• Upgrade Path: For oil, chemicals, or seawater, disc and seat materials can be changed upon request.



4. Compact Wafer Body – Space-Saving & Easy Installation  

The wafer design installs directly between standard pipeline flanges using through-bolts.

• Lightweight & Compact: No companion flanges needed, reducing total installed weight and space.

• Fast Bolt-Up: Align between EN 1092 or ANSI B16.5 flanges and secure – no special tools required.

• Standard Face-to-Face: Conforms to ISO 5752 / EN 558 Series 20, ensuring compatibility.



5. Fully Customizable – Tailored to Your Media  

We manufacture strictly to customer specifications.

• Disc Material Options: CF8, CF8M, duplex 2205, super duplex 2507, aluminum bronze, or coated ductile iron.

• Seat Material Options: EPDM, NBR, Viton, PTFE...

• Other Customizations: Pressure rating (PN10/16, Class 150), flange standard (EN, ANSI, AS2129, JIS), epoxy color (any RAL), ISO 5211 top flange for actuator mounting.

Why Choose Tianjin Worlds Valve?

 

1. We manufacture strictly according to customer specifications. Need a special disc or seat material? We produce it.

2. Our two-shaft design simplifies maintenance and reduces the risk of stem seizure.

3. Full documentation – material certificates, test reports – provided with every order.

4. ISO 9001-certified facility with CE, UKCA, WRAS, and ACS certifications available.

 

Conclusion

We invite you to contact us for a competitive quotation or to arrange a visit to our factory. Our team is ready to discuss your project and deliver a valve tailored to your exact needs.