Concentric Soft Seal Wafer Butterfly Valve | Cast Iron Body with EPDM Seat | Zero Offset Butterfly Valve for Industrial Flow Control DN50-DN1000

Product Overview

The Concentric (Zero Offset) Soft Seal Wafer Butterfly Valve is a reliable and cost-effective flow control solution designed for water, HVAC, industrial and general pipeline applications.

Featuring a zero offset concentric design, the valve stem is positioned at the centerline of the disc and valve body, allowing uniform sealing contact between the disc and EPDM seat. This structure provides bubble-tight shut-off, low operating torque, and long service life.

The valve is manufactured with a durable cast iron body and EPDM soft seat, offering excellent corrosion resistance and reliable performance in water, air, steam, oil and other compatible media. The wafer-style compact design allows easy installation between flanges, making it ideal for piping systems where space and cost efficiency are important.

Available in sizes from DN50 to DN1000 (2″-40″), with manual lever, worm gear, electric or pneumatic actuator options, this concentric butterfly valve is widely used in water treatment plants, HVAC systems, fire protection systems, industrial process pipelines and power generation applications.

OEM and ODM customization are available according to customer requirements.

Concentric Zero Offset Soft Seal Wafer Butterfly Valve

Technical Specifications

Parameter	Specification
Product Name	Concentric Soft Seal Wafer Butterfly Valve
Valve Design	Concentric (Zero Offset) Butterfly Valve
Body Material	Cast Iron GG25 / ASTM A126 Class B
Disc Material	Cast Iron / Ductile Iron / Stainless Steel (Optional)
Seal / Liner Material	EPDM Soft Seal
Shaft / Stem Material	Stainless Steel (2Cr13 / SS304 / SS316)
Valve Type	Wafer Butterfly Valve / Concentric Design
Size Range	DN50 – DN1000 (2″ to 40″)
Nominal Pressure	PN10 / PN16 (Customizable)

Concentric Zero Offset Soft Seal Wafer Butterfly Valve

Key Features

• Concentric Zero Offset Design
• EPDM Soft Seal for Bubble-Tight Shut-Off
• Wafer-Type Compact Design
• Wide Size Range – DN50 to DN1000
• Versatile Operation Options
• Multi-Media Compatibility
• ISO 5211 Mounting Standard

Applications

• Water Treatment System
• HVAC Systems
• Industrial Process Lines
• Oil & Gas Pipelines
• Power Generation Systems
• Fire Protection Pipelines

Concentric Zero Offset Soft Seal Wafer Butterfly Valve

FAQ

Q1: What is a concentric (zero offset) butterfly valve?

A: A concentric butterfly valve, also called a zero offset butterfly valve, is designed with the shaft located at the centerline of the valve disc and body. The disc rotates through the soft seat with uniform contact, providing reliable sealing and simple operation.

Q2: What is the difference between concentric and double offset butterfly valves?

A: Concentric butterfly valves use a simple centerline design and are mainly used for water, HVAC and general industrial applications. Double offset butterfly valves reduce seat friction and are suitable for higher pressure and more demanding applications.

Q3: Can this butterfly valve be used for steam?

A: Yes. Butterfly valves with EPDM seals are suitable for saturated steam (up to +120°C). For higher-temperature steam applications, we recommend selecting a configuration with PTFE or metal seals. Please specify the steam operating conditions when placing your order.

Q4: Can the valve body material be upgraded to ductile iron or stainless steel?

A: Yes. We offer options to upgrade the valve body material to ductile iron (for higher strength and impact toughness) or stainless steel (for superior corrosion resistance). Please specify your requirements when placing your order.

Concentric Zero Offset Soft Seal Wafer Butterfly Valve

Packing and Shipment

Packing depends on the product type and quantity. Options include coiling, rolls, bundle packing, wooden crates, or boxes. Shipment can be arranged by sea, railway, air, or as per customer’s request.

Company Profile

LUOYANG DATANG ENERGY TECH CO., LTD is a professional industrial valve supplier, dedicated to providing reliable flow control solutions for fire protection, HVAC, water treatment, and industrial piping systems worldwide. All products are manufactured to international standards with UL/FM, CE, and ISO 9001 certifications. With over 10 years of experience, a modern facility of 80,000 m², and 200+ professional employees, we serve customers in 10+ countries with quality products, competitive pricing, and reliable delivery.

Payment Terms

T/T, L/C at sight, Western Union & PayPal, etc.

Concentric Zero Offset Soft Seal Wafer Butterfly Valve