The pneumatic soft-seal butterfly valve features an eccentric metal seal design. The valve seat sealing ring is composed of a soft T-shaped sealing ring and multiple layers of stainless steel sheets. The outer circumference of the valve plate has a spherical shape to achieve pressurized opening and closing. Driven by a piston-type double-acting or single-acting pneumatic actuator, the valve plate rotates 0~90°, featuring low operating torque, fast opening and closing speed, and bidirectional zero-leakage sealing.
Sealing methods include elastic sealing and metal sealing. It supports flange and wafer connections, and the operating pressure ranges from vacuum to high pressure. The actuator can be equipped with limit switches, solenoid valves, and other accessories, and receives 4-20mA signals for regulation and control functions.
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Pneumatic soft seal butterfly valve Technical parameters
Material: Ductile iron, stainless steel (304, 316), or carbon steel.
Size Range: DN40 to DN1000
Connection Options: Wafer, lug, and flanged connections are standard.
Working Pressure: Standard pressure ratings include PN10, PN16, and PN25.
Working Temperature: Operating temperatures vary based on seal material:
Sealing Options: Soft seals EPDM, NBR, PTFE, or Viton.
Manufacturing Method: Casting or forging processes.
Applicable Medium: Suitable for water, air, oil, and other non-corrosive fluids.
Pneumatic soft seal butterfly valve Structural Features
Soft Sealing Structure
Single or Double Eccentric Design: Reduces opening and closing friction, extending service life.
Soft T-Type Sealing Ring: Multiple layers of stainless steel sheets are stacked on both sides, combining the advantages of both hard and soft metal seals, achieving zero leakage sealing under both low and high temperature conditions.
Sealing Pair: Composed of metal materials (such as stainless steel valve plates) and non-metallic soft materials (such as NBR, FKM, PTFE, etc.), forming an elastic deformation sealing structure.
Sealing Form:
Valve Seat Sealing Ring: A combination of a soft T-shaped sealing ring and multiple layers of stainless steel sheets, fixed to the valve body. An adjusting ring and spring compensate for the tolerance between the bushing and the valve body, as well as the elastic deformation of the valve stem, solving the sealing problem in bidirectional media transportation.
Pneumatic Actuator
Uses a piston or rack and pinion structure, using compressed air (0.4-0.7MPa) to drive the piston or diaphragm, which in turn rotates the valve stem.
Supports both double-acting (air-driven switch) and single-acting (spring-return, fail-safe) modes, offering fast response and high output torque.
Connection Types
Flanged: Connects to the pipe flange via bolts, ensuring reliable sealing; suitable for high-pressure, large-diameter applications.
Clip-on: Clips directly between the flanges at both ends of the pipe, requiring less installation space; suitable for small to medium diameter pipes.
Pneumatic soft seal butterfly valve Applications
Water Treatment Industry
Used for pipeline regulation and shut-off in waterworks and wastewater treatment plants, such as the FBPX pneumatic soft-seal butterfly valve, which features a double eccentric structure, reliable sealing, and long service life.
Food and Beverage Industry
Using stainless steel valve bodies and food-grade rubber seals, meeting hygiene standards, for media regulation in beverage production lines and pharmaceutical reactors.
Chemical and Petroleum Industry
Used for precise control of media such as crude oil and chemical raw materials, such as feed regulation in reactors and pipeline shut-off and flow control.
Light Textile and Paper Industry
Used for regulating media such as pulp and textile fibers, adaptable to working conditions containing particulate media.
Pneumatic soft seal butterfly valve factory
