Pneumatic Three Eccentric Butterfly Valve _ Electric Three Eccentric Butterfly Valve

Comparative analysis of pneumatic triple eccentric butterfly valve and electric triple eccentric butterfly valve, comprehensive technical characteristics, application scenarios, and market data:

1、 Core structure and working principle
Triple eccentric design
First eccentricity: The axis of the valve stem deviates from the center of the butterfly plate, reducing opening and closing friction.
Second eccentricity: The axis of the valve stem is offset from the centerline of the pipeline, reducing the contact area of the sealing surface.
Third eccentricity: The sealing surface of the valve seat is inclined in a conical shape, achieving a self-locking seal that becomes tighter as it is closed.
Differences in driving methods
Pneumatic type: The piston actuator is driven by compressed air, with a fast response time (<1 second), suitable for explosion-proof environments.
Electric type: motor-driven, supporting 4-20mA signal adjustment, with higher accuracy (adjustment ratio 100:1).
2、 Performance comparison
Parameter Pneumatic Three Eccentric Butterfly Valve Electric Three Eccentric Butterfly Valve
Sealing grade ANSI Class VI (soft seal) Metal hard seal can reach ANSI Class V
Temperature resistance range -40 ℃~650 ℃ -40 ℃~450 ℃
Applicable pressure PN16~PN40 (ANSI 150~600LB) PN10~PN40
Control accuracy switch type/adjustable type (with locator required) continuous adjustment (± 1% accuracy)
Advantage scenario:
Pneumatic type: suitable for flammable and explosive working conditions that require quick cut-off (such as chemical reaction vessels).
Electric type: suitable for high-precision flow control (such as power plant boiler feedwater).
3、 Typical application areas
Petrochemical industry
Pneumatic type: controls high temperature and high pressure acidic gases (such as hydrogen sulfide).
Electric type: Adjust the flow rate of corrosive liquids (such as hydrofluoric acid).
Power industry
Pneumatic type: flue gas regulation for desulfurization system.
Electric type: steam pipeline pressure control.
Metallurgical industry
Pneumatic type: rapid cut-off of blast furnace gas.
Electric type: The flow rate of the hot blast stove is precisely adjusted.

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