Two Stem Wafer Butterfly Valve with Back-Up EPDM Seat | Lever Operated | Durable Design

Introduction：

Tianjin Worlds Valve Co., Ltd. – ISO 9001, CE, UKCA & WRAS Certified Manufacturer

CBF03-TA01-Operation and Maintenance Manual DOWNLOAD

Key Features & Advantages:

1. Two Stem (Two-Piece) Construction for Enhanced Reliability

• Reduced Torsional Stress: The upper and lower stem sections distribute torque more evenly, minimizing stress concentration and reducing the risk of stem failure.

• Precise Disc Alignment: The two-piece design ensures consistent disc centering within the seat, reducing uneven wear and maintaining sealing integrity over thousands of cycles.

• Simplified Maintenance: The Two Stem configuration allows easier disassembly during service, as the upper stem can be removed without fully disengaging the disc.

2. Hard Back-Up EPDM Seat for Consistent Sealing Performance

• Rigid Seat Support: The EPDM seat is molded with a hard backing that prevents extrusion or deformation under pressure, maintaining sealing geometry at the full PN16 rating.

• Extended Service Life: The back-up design reduces compression set and fatigue, allowing the seat to retain elasticity longer than unsupported elastomer seats.

• Bubble-Tight Shut-Off: The combination of the supported seat and precision disc provides reliable zero-leakage closure for water and air services.

3. Compact Wafer Body for Space-Saving Installation

• Lightweight Construction: The wafer body eliminates the need for companion flanges, reducing overall system weight and material costs.

• Quick Bolt-Up Installation: The valve centers between standard EN or ANSI flanges and is secured with through-bolts, minimizing installation time.

• Interchangeable Dimensions: Face-to-face dimensions conform to ISO 5752 and EN 558 Series 20, ensuring compatibility with existing piping layouts.

4. Corrosion-Resistant Material Options

• Ductile Iron Body with Epoxy Coating: The GGG40 body provides high strength and impact resistance, with a durable epoxy coating (250μm) protecting against atmospheric and water-side corrosion.

• CF8M Stainless Steel Disc: Standard disc offers good corrosion resistance for treated water and mild chemicals.

• Customizable Disc Materials: Options include aluminum bronze, duplex stainless steel, nylon-coated, or PTFE-coated discs for specialized media.

Standard:

Why Choose Tianjin Worlds Valve?  

• Engineered for Durability: Our Two stem and hard back-up seat designs reflect a commitment to mechanical reliability and long service life.

• OEM Manufacturing Expertise: As a focused OEM manufacturer, we offer consistent quality, flexible material options, and the ability to customize flange standards, coatings, and packaging.

• Certified Quality: ISO 9001 certified facility with CE, UKCA, and other certification options available upon request.

• Global Experience: Supplying valves to over 50 countries with reliable logistics and professional documentation support.

Typical Applications:

• Water Distribution and Treatment Plants

• HVAC Systems (Chilled Water, Cooling Towers)

• Pump Suction and Discharge Lines

• Irrigation Networks

• Industrial Process Water Circuits

Conclusion:

The Two Stem Wafer Butterfly Valve with Hard Back-Up EPDM Seat from Tianjin Worlds Valve Co., Ltd. combines mechanical reliability with practical serviceability. Its two-piece stem design reduces wear and ensures precise disc alignment, while the supported seat construction maintains sealing integrity over years of operation. The PN16 rating, DN100 size, and lever operation make it a dependable choice for water and general industrial applications. 

When your application demands a durable, service-friendly butterfly valve—choose Tianjin Worlds Valve Co., Ltd. Contact us today for technical specifications, material customization options, or a quotation tailored to your application.