EX-FB Explosion-Proof Electric Actuated Cast Iron Flanged Butterfly Valve for Hazardous Area Industrial Applications
The EX--FB is an explosion-proof electric actuated butterfly valve featuring a durable cast iron body and standard flanged connections for safe, automated flow control in hazardous industrial environments. Certified to ATEX/IECEx standards, its fully enclosed electric actuator eliminates ignition risks in volatile atmospheres containing flammable gases, vapors, or dust. The cast iron construction ensures excellent pressure resistance and long-term reliability, while the flanged design allows seamless installation into ANSI, DIN, and JIS piping systems. With precise quarter-turn operation, high torque output, and remote automation capability, the EX-DK56-FB is a cost-effective solution for process control across oil & gas, chemical, power generation, and other critical industries.
Size Range: DN40-DN1200
Material:Cast Iron, WCB, SS304/316 etc.
Connection Standard:GB / ANSl /JIS /DIN
The EX-DK56-FB combines certified explosion-proof electric actuation with durable cast iron construction, excelling in safety, reliability, and automation performance. Its compact flanged design reduces installation footprint compared to traditional gate or globe valves, while the integrated electric actuator delivers accurate positioning and full DCS/PLC compatibility — without the ongoing air supply costs of pneumatic alternatives.
✅Certified Explosion-Proof Safety The integrated electric actuator is built to meet ATEX, IECEx,explosion-proof standards, featuring a flame-path enclosure and sealed terminal housing that prevent internal sparks or heat from igniting external hazardous atmospheres. This ensures full compliance for Zone 1, Zone 2, Zone 21, and Zone 22 classified installations without requiring additional protective measures.
✅Durable Cast Iron Body Construction Manufactured from high-grade cast iron (GG25 / GGG40), the valve body provides superior mechanical strength, pressure resistance, and corrosion tolerance across a wide temperature range. The dense iron microstructure withstands water hammer, vibration, and thermal cycling, delivering a service life that significantly outlasts lighter-material alternatives in demanding industrial piping systems.
✅Precise Electric Actuation with Smart Control The quarter-turn electric actuator delivers high torque output with precise 0–90° positioning accuracy, supporting both on/off switching and proportional modulating control via 4–20 mA or digital signal inputs. Built-in features such as manual override, position feedback, torque protection, and self-locking gearing eliminate the need for external limit switches or solenoid valves, simplifying integration into automated process control networks.
✅Universal Flanged Connection & Easy Installation The standard flanged end design conforms to ANSI B16.5 (Class 150/300), EN 1092 (PN10/PN16/PN25), and JIS 10K/20K drilling patterns, enabling direct bolt-up installation between pipeline flanges with no special adapters. The compact, lightweight disc-in-body architecture reduces both pipe stress and installation labor compared to globe valves or ball valves of equivalent bore size.
✅Low Total Cost of Ownership Electric actuation eliminates the need for compressed air infrastructure, reducing energy consumption and ongoing maintenance costs. The self-contained design requires no lubricators, filter-regulators, or air piping — while the wear-resistant disc seal ensures reliable, leak-free shut-off across thousands of operating cycles, minimizing downtime and replacement frequency.
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Industry Applications
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Oil & Gas
In upstream, midstream, and downstream oil & gas operations, the EX-FB provides explosion-proof automated flow control for pipeline isolation, crude oil transfer, gas processing, tank farm management, and flare system regulation. Its ATEX/IECEx-rated actuator ensures safe, spark-free operation in Zone 1 and Zone 2 hazardous areas where hydrocarbon vapors are present, while the rugged cast iron body withstands the high pressures and harsh outdoor conditions typical of refineries, offshore platforms, and natural gas compressor stations. -
Chemical & Petrochemical
The EX-FB is widely deployed in chemical and petrochemical plants for automated control of process feeds, solvent circulation, cooling water distribution, and waste stream isolation. Its explosion-proof electric actuator meets the stringent safety requirements of facilities handling flammable chemicals, organic solvents, and reactive intermediates. The cast iron flanged body provides reliable containment and resistance to mild chemical media, supporting both continuous process regulation and emergency shut-off sequences. -
Power Generation
Power plants rely on the EX-DK56-FB for automated control of cooling water circuits, boiler feedwater systems, condensate return lines, fuel oil supply, and auxiliary steam piping. The electric actuator integrates directly with plant DCS and SCADA systems for real-time remote operation, while the cast iron body handles the thermal stresses and sustained pressures of both fossil-fuel and combined-cycle power generation facilities. Explosion-proof certification ensures safe deployment in fuel storage and handling zones. -
Food & Pharmaceutical
In food processing and pharmaceutical manufacturing environments, the EX-DK56-FB serves utility and non-product-contact applications including steam distribution, cooling water control, HVAC process loops, and wastewater discharge. The electric actuator enables hygienic automated operation without the contamination risk associated with pneumatic exhaust air, and its explosion-proof rating is essential in facilities handling flammable ingredients such as grain dust, alcohol-based solvents, or aerosol propellants. -
Water & Wastewater
Municipal and industrial water treatment plants use the EX-DK56-FB for automated control of raw water intake, filtration backwash, chemical dosing isolation, aeration basin flow, and treated effluent discharge. The durable cast iron body resists the corrosive effects of chlorinated water and chemical treatment agents, while the electric actuator provides precise modulating control that optimizes treatment processes. Its flanged connection simplifies integration into large-diameter piping networks common in water infrastructure. -
HVAC & District Heating
The EX-DK56-FB delivers reliable automated flow regulation in large-scale HVAC systems and district heating/cooling networks, controlling chilled water, hot water, and steam distribution across commercial buildings, industrial complexes, and municipal energy systems. The electric actuator supports proportional control for optimal temperature balancing and energy efficiency, while the cast iron flanged body is rated for the sustained pressures and temperature differentials encountered in central plant piping and underground distribution mains.
Why Partner with DELCO Valves
Driven by modern CNC precision, 100% pressure testing, and comprehensive international compliance, DELCO delivers high-performance automated flow control solutions engineered for demanding global infrastructure.
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