Expansion telescopic butterfly valve

The design ofairbag butterfly valve, expansion butterfly valve and pneumatic powder butterfly valve* adopts gas pressure to inflate special rubber seat, and the seat extends towards valve disc, so as to provide uniform pressure distribution for sealing at any time. nbsp; During opening and closing of the valve, disc and seat contact occurs only momentarily so that the disc is subjected to only slight impact.   nbsp; The hard friction caused by rubbing the disc against the seat of a conventional butterfly valve reduces the performance and life of the valve. nbsp;

Airbag butterfly valves, inflatable butterfly valves, and pneumatic powder butterfly valvesrequire only a small amount of torque to open and close, which makes the actuators and valves more durable. nbsp;

According to the actual comparison test and field application, the performance of pneumatic powder butterfly valve with air bag expansion is better than other valves. Butterfly valve life can reach 1 to 1 million times, even in severe wear and tear can also be used.& nbsp; For dry solids, gases and slurries, expansion butterfly valves are preferred. nbsp;

Pneumatic powder butterfly valve series with inflatable bladder is designed for harsh conditions. Valves are available in size ranges from 2 "(50mm) to 24"(600mm) for ANSI and metric flange standards.& nbsp; A complete range of actuators, limit switches and controls are available to effectively meet the requirements of different applications.

Partial application of expansion butterfly valve products
Slurry materials, powder, granular silicon powder, dangerous chemical powder, Portland cement, explosive powder, aluminum powder, silica sand, fertilizer, PVC powder, catalyst, titanium silicate, carbon powder, phenolic resin, quartz powder, etc.

performance characteristics 
Expandable seats reduce disc and seat wear 
Long valve life 
Less seat wear 
Disc collision is minimal 
Ultra-low torque requirements 
Lower actuator energy requirements 
Large sealing contact area 
Proven advantages for abrasive materials and  dry bulk solids 
Valve disc design prevents accumulation of material 
double shaft seal 
multiple bearing 
Temperature limits: -40 C to 175 C vary with the actual application and materials of manufacture.

Supply gas: up to 9.3 bar to the valve seat varies with the material of manufacture and the actual application.

Working pressure: full vacuum up to 10.3 bar varies with manufacturing materials and actual applications.

Operating torque: varies with actual application.


Material:
Body: cast iron, stainless steel, aluminum.
Seat: EPDM, butyl rubber, fluororubber, silicone, white butyl rubber, white EPDM.
Valve plate: cast iron, 304.316 stainless steel.
Shaft: 304.316 stainless steel.
Bearing: Polymer, Bronze.& nbsp;
Valve plate screws: carbon steel, stainless steel.