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Classification and Characteristics Analysis of Pneumatic Butterfly Valves: Core Components for Industrial Fluid Control


Release time:

2025-07-23 15:16:25


 As a key actuator in the field of industrial automation, pneumatic butterfly valves play an important role in industries such as petrochemicals, power, water treatment, food and medicine due to their compact structure, rapid opening and closing, and excellent regulating performance. This article will systematically analyze the technical connotation and application value of pneumatic butterfly valves from three dimensions: classification system, structural characteristics, and performance advantages.


 1、 Multidimensional classification system: precise matching of working condition requirements

(1) Classified by sealing form

Soft sealed pneumatic butterfly valve

Using rubber and polytetrafluoroethylene(PTFE)Using non-metallic materials as sealing pairs has the characteristics of zero leakage, low opening and closing torque, and strong corrosion resistance. Typical application scenarios include:

Food and pharmaceutical industry:PTFELined butterfly valves can withstand strong acids and alkalis, meeting the requirementsGMPhealth standard

HVAC system: EPDM rubber(EPDM)Sealed butterfly valve adaptation-20℃~120℃Temperature change

Wastewater treatment: Nitrile rubber(NBR)Sealed butterfly valve resistant to chloride ion corrosion, with a lifespan of up to5Ten thousand times opening and closing

Hard sealed pneumatic butterfly valve

Adopting a metal to metal or metal to hard alloy sealing structure, it has the ability to withstand high temperature and high pressure:

Thermal power generation:316Lstainless steel+Sitaili alloy sealed butterfly valve, capable of withstanding600℃Steam16MPapressure

Petroleum refining: Three eccentric hard sealed butterfly valve achieves bidirectional zero leakage,API 609 Class VILevel certification

Metallurgical industry: Nickel based alloy sealed butterfly valve is resistant to molten metal corrosion and has a long service life10year


(2) Classified by structural form

Clamp type pneumatic butterfly valve

Adopting a short flange distance design, with a thickness only equivalent to that of a flange valve1/3Especially suitable for:

Ship pipeline: saves limited space and has excellent anti vibration performance

Automated production line: directly connected to pneumatic actuators, response time≤0.5second

Vacuum system: leakage rate of specially designed vacuum clamp butterfly valve≤ 1×10 minus 838313;Pa·m³/s

Flange type pneumatic butterfly valve

Standard flange connection structure, diameter rangeDN40-DN3000, applicable to:

Urban water supply network:DN1200Flow coefficient of large-diameter butterfly valveCvValue reaching2.8×10⁶

Chemical Industrial Park:HAGrade anti-corrosion flange butterfly valve passes throughISO 15848Micro leak authentication

Nuclear power plant: seismic flange butterfly valve meets the requirementsIEEE 344Standard, seismic intensity resistancelinear measure

Telescopic pneumatic butterfly valve

Integrated bellows compensator, capable of absorbing±50mmAxial displacement of pipelines, typical applications:

Geothermal heating: compensating for slight deformation of the earth's crust and preventing valve jamming

LNGReceiving station: ultra-low temperature telescopic butterfly valve adaptation-196℃~Normal temperature thermal expansion and contraction

Cross sea pipeline: Design life of anti seawater corrosion expansion butterfly valve30year


(3) Classified by functional characteristics

Adjustable pneumatic butterfly valve

Equipped with an intelligent locator to achieve0.1%Precision flow control:

Fine chemical industry: equal percentage flow characteristic butterfly valve, regulating ratio up to100:1

Boiler feedwater: fast opening butterfly valve in combinationPIDControl, pressure fluctuations≤±0.02MPa

Environmental desulfurization: wear-resistant butterfly valve for solid content treatment40%Limestone slurry

Cut off pneumatic butterfly valve

Adopting a double acting cylinder actuator to achieve millisecond level emergency shutdown:

Natural gas long-distance pipelines:ESDFunction butterfly valve cut-off time≤2second

Storage and transportation of hazardous chemicals:ATEXExplosion proof certified butterfly valve, suitable forZone 1Explosion hazard zone

Fire protection system: Rainproof valve group matched with butterfly valve passes throughUL/FMDual authentication


2、 Structural characteristic innovation: breaking through the limitations of traditional valves

(1) Triple eccentricity technology innovation

The third generation three eccentric hard seal butterfly valve is designed with three-dimensional eccentricity:

 

Cone shaped axial eccentricity: eliminating friction at the moment of contact between the valve seat and the butterfly plate

Radial eccentricity: achieving90°Friction free opening and closing throughout the entire rotation process

Angular eccentricity: Ensure automatic compensation of the sealing surface during high-temperature expansion

Experimental data shows that this structure reduces the opening and closing torque of the valve60%Extend lifespan to10Over ten thousand times.


(2) Breakthrough in Lightweight Design

Using finite element analysis to optimize the valve body structure:

 The weight of carbon steel butterfly valves is reduced compared to gate valves of the same specification45%

Titanium alloy butterfly valve has a specific strength of230kN·m/kg, applicable to the aerospace industry

Composite butterfly valve density1.8g/cm ³, with better impact resistance than aluminum alloy


(3) Intelligent integration development

New generation intelligent butterfly valve integration:

 wirelessHARTCommunication module: Implementing remote diagnosis and predictive maintenance

Piezoelectric torque sensor: real-time monitoring of sealing status

Self cleaning filtration system: automatically eliminates impurities in the gas source, reducing the failure rate80%


3、 Performance Advantage Analysis: Building a New Paradigm for Industrial Control

(1) Model of Energy Efficiency Optimization

existDN600Comparison of energy consumption between butterfly valves and gate valves in water pipelines:

 parameter butterfly valve Gate valve

Flow resistance coefficient 0.15 0.8

Pump power consumption185kW 240kW

Annual energy savings 47ten thousandkW·h -

CO₂Emission reduction376ton-

 

(2) Full lifecycle cost

useDN300Taking steam valves as an example,10Annual usage cycle cost analysis:

 cost item Butterfly valve (10000 yuan) Ball valve (10000 yuan)

Initial procurement 8.5 12.0

maintenance cost 3.2 7.8

Shutdown losses 1.1 4.5

total cost 12.8 24.3

 

(3) Adaptability to extreme working conditions

Ultra low temperature application: Butterfly valves are used for liquid nitrogen pipelinesInconel 718Alloy,-196℃Maintain impact toughness120J/cm ²

Strong corrosive environment: Hastelloy alloyC-276Butterfly valve in98%Corrosion rate in sulfuric acid≤0.01mm/year

High voltage scenario:API 6DStandard butterfly valve passes through2250psiHydrostatic pressure test, with a burst pressure of11250psi

 

4、 Industry application trends

In the field of new energy, butterfly valves are used for hydrogen energy pipelinesISO 19880-3Certification, helium leakage rate≤1×10[UNK]⁶ mbar·l/s

Digital Twin Technology: Based onCFDSimulated butterfly valve flow field optimization improves regulation linearity23%

Modular design: Implementation of standard interface butterfly valve30Quick replacement in minutes improves maintenance efficiency5times

As an industrial fluid control"Smart Joint"Pneumatic butterfly valves are continuously expanding their application boundaries through the deep integration of material science, intelligent control, and digital technology. From traditional truncation functions to intelligent flow management, from single valves to system solutions, this technological evolution path is redefining the control paradigm of modern industry.


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