The electric eccentric hemisphere valve is a type of valve that uses an electric motor as a power source to control the opening and closing of the valve by controlling the rotation of the motor. It features an eccentric hemisphere design, controlling fluid flow by rotating the hemisphere. It is characterized by low flow resistance, good sealing performance, corrosion resistance, and long service life.
The electric eccentric hemisphere valve is widely used in petroleum, chemical, metallurgical, power, urban water supply, and sewage treatment industries, and is a highly efficient, safe, and reliable fluid control device.
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Electric Eccentric Hemisphere Valve Technical parameters
Size Range: DN100-DN1400
Pressure Range: PN1.6~25MPa
End Connection: Flanged, Welded
Material: WCB, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L)
Valve Design: Motorized Eccentric Hemisphere, Body-Loading
Applicable temperature: -46 ℃~500 ℃
Suitable Medium: Water, Oil, Gas
electric eccentric hemisphere valve Features
- Low Flow Resistance: Due to the eccentric hemispherical design of the valve core, the fluid experiences less resistance when passing through the valve, which helps reduce energy consumption.
- Good Sealing: A tight sealing surface is formed between the valve core and the valve seat, effectively preventing media leakage.
- Corrosion Resistance: The valve body, valve core, and other components can be made of corrosion-resistant materials, making it suitable for controlling corrosive media.
- Long Service Life: Due to its simple structure and good sealing performance, the electric eccentric hemispherical valve has a long service life.
electric eccentric hemisphere valve Main Components Material
| Body | Grey cast iron | Ductile Iron | Cast steel |
| Bonnet | Grey cast iron | Ductile Iron | Cast steel |
| Stem | 2Cr13 | 2Cr13 | 2Cr13 |
| Seat | Stainless steel | Stainless steel | Stainless steel |
| Spherical | Ductile iron cover rubber, stainless steel | Stainless steel | Rubber covered steel / stainless steel |
| Hemisphere | Grey cast iron | Ductile Iron | Cast steel |
electric eccentric hemisphere valve Working Principle
Electric Drive
The actuator receives control signals (such as DC 4-20mA, DC 24V switching signals, or RS485 communication protocol). The motor inside rotates, transmitting power to the valve stem via a reduction gear.
The valve stem drives the hemispherical valve disc to rotate eccentrically, opening or closing the valve.
Sealing Mechanism
When opening: The valve disc quickly disengages from the sealing surface, reducing friction and lowering operating torque.
When closing: The valve disc, through eccentric wedge action, compresses the sealing surface, forming a hard metal seal or a soft seal (such as a rubber lining), ensuring zero leakage.
electric eccentric hemisphere valve Advantages
Automated Control
Supports remote operation, timed control, or integration with DCS/PLC systems for unattended operation and improved production efficiency.
High-Precision Regulation
The regulating electric actuator can precisely control valve opening (accuracy ±1%), adapting to the needs of fine-tuning flow, pressure, and temperature.
Low Torque, Long Lifespan
The eccentric structure reduces friction, resulting in low output torque requirements for the electric actuator and extending the lifespan of the motor and transmission components.
Frequent wear on the sealing surface leads to longer maintenance cycles and lower overall costs.
Fast Response
The electric actuator has a fast opening and closing speed (typically <10 seconds), suitable for emergency shut-off or rapid adjustment scenarios.
Safe and Reliable
Integrates overload protection, automatic reset after power failure, and explosion-proof design (Ex certified), adapting to hazardous working conditions.
electric eccentric hemisphere valve Applications
Oil & Gas
Remote control valves for long-distance pipelines, refineries, and natural gas processing stations.
Chemical Industry
Transportation of corrosive media and regulation of inlet and outlet flow rates in reaction vessels.
Power Industry
Automatic control of boiler feedwater, steam pipelines, and cooling water systems.
Water Treatment
Flow regulation and shut-off in wastewater treatment plants, seawater desalination plants, and water supply pipelines.
Metallurgical Industry
Remotely operated valves for high-temperature molten metal conveying and dust removal systems.
Building HVAC
Balancing and regulation of central air conditioning systems and heating networks.
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