Eccentric Inflatable Seal Butterfly Valve

This friction-free sealing mechanism effectively addresses the strict hygiene and purity requirements in the handling of food, pharmaceuticals, and other sensitive materials. It also eliminates concerns related to seal wear and potential contamination from seal degradation.

The Eccentric Inflatable Seal Butterfly Valve is especially suitable for handling liquids, powders, granules, and similar materials, and is widely used in industries such as food processing, milk powder production, biotechnology, and other sanitary applications.

The Eccentric Inflatable Seal Butterfly Valve, also known as an air-sealed butterfly valve, is a high-performance sanitary valve engineered for hygienic and aseptic applications. Its standout feature is a friction-free sealing mechanism: when the valve is closed, compressed air expands the valve seat to press tightly against the valve disc, ensuring a secure seal. When the valve opens, the air is released, allowing the seat to retract and completely disengage from the disc—eliminating friction, minimizing wear, and significantly reducing operating torque.

This unique sealing technology makes the valve ideal for process systems requiring high purity, such as in the food and beverage, milk powder, pharmaceutical, biotech, cosmetic, and fine chemical industries. All contact materials are available in SS304 or SS316L, with sealing components compliant with FDA 21 CFR 177.2600 standards. The valve is fully compatible with CIP/SIP cleaning and sterilization systems, ensuring reliable hygienic operation.

Key Advantages

Friction-Free Sealing Design: Prevents particle shedding and cross-contamination, greatly extends seal life.
Low Operating Torque: Easy automation with smaller actuators, reducing system complexity and cost.
Fully Hygienic and Food-Grade: All wetted parts made from 304/316L stainless steel; seals available in Viton, EPDM, or Silicone, FDA-compliant.
Versatile Connections: Available in clamp, welded, and flanged versions to meet DIN, ISO, and ASME-BPE standards.
Ideal for Various Media: Suitable for liquids, powders, and granular materials.
Aseptic Compatibility: Designed for cleanroom and sterile environments with full CIP/SIP support.

This Eccentric Inflatable Seal Butterfly Valve is an ideal solution for applications that require ultra-clean processes, extended valve longevity, and strict compliance with international sanitary standards. It is a trusted choice in the sanitary process valve market, delivering long-term reliability, minimal maintenance, and top-level product safety.

piston type

Technical Specifications

Size Range: 2.0" to 10.0"
Working Pressure: -0.1 MPa to +0.5 MPa
Control Air Supply Pressure: 0.6 MPa
Actuator Options:0–90° pneumatic actuator
Pneumatic rotary motor (optional)
Working Temperature: -20°C to +150°C
Metal Materials:
Contact with medium: SS304 or SS316L
Non-contact parts: SS304
Sealing Materials:
Viton (FDA 21 CFR 177.2600 compliant, standard configuration)
Optional: Silicone Rubber, EPDM Rubber
Surface Finish:
Contact surfaces: Ra < 0.4 μm
Non-contact surfaces: Ra < 0.8 μm
Cleaning/Sterilization Method: CIP/SIP compatible
Explosion-Proof Rating: ATEX II 2 GD T4
Connection Standards:
DIN 11850 Series 2
ASME BPE
ISO 1127 Series 1e
Connection Methods: Clamp, Welded, Flanged