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Electronic Expansion Valves: A Powerful Tool for Energy Efficiency Upgrades

October 29,2023

Electronic expansion valves,  as a key component in refrigeration systems, boast impressive flow control capabilities that cater to the cooling needs under various conditions. Traditional throttling components like capillary tubes and thermal expansion valves can sometimes fall short, especially in scenarios where the load frequently changes or the operating range is extensive. Consequently, electronic expansion valves, when combined with variable capacity compressor technology, are gaining increasing popularity.

The working principle of electronic expansion valves involves monitoring the temperature and pressure of the refrigerant at the evaporator outlet. Typically, temperature and pressure sensors are located at the evaporator's exit, with some designs also featuring temperature sensors midway through the evaporator to capture evaporation temperature data. The information gathered from these sensors is used to compute the superheat signal, which is then adjusted through feedback control to regulate the opening of the electronic expansion valve.

Moreover, electronic expansion valves can employ a combined control strategy of feed-forward plus feedback to enhance the control system's performance. This approach is designed to counteract the delay in superheat control caused by the thermal capacity of the evaporator walls and sensors, thereby refining the system's control quality. Maintaining superheat within the desired range across a broad spectrum of evaporation temperatures is crucial to boost the system's efficiency and performance.

In conclusion, electronic expansion valves, by leveraging data from temperature and pressure sensors coupled with a compound control strategy, offer highly precise control over the refrigerant flow. The applicability of this technology is widening, especially in refrigeration systems that need to adapt to varying loads and conditions, aiming for enhanced energy efficiency and user comfort. Electronic expansion valves hold a significant role in modern refrigeration technology, driving superior performance in refrigeration systems.

HONGSEN HVAC DPF EEV Electronic Expansion Valve


Electric Control Valves: The New Trend in Intelligent Control

Electric control valves are critical devices used to control the flow, pressure, and temperature of fluids, such as liquids and gases. They play a crucial role in industrial automation systems and have diverse features and widespread applications.

First and foremost, these valves excel in automatic control capabilities. Equipped with electric actuators, they can adjust the valve's position in real-time by controlling electrical signals to meet predefined process parameters. This automation ensures accuracy in fluid flow and pressure, making them particularly suitable for industries requiring high-precision control, such as the chemical and pharmaceutical sectors.
Secondly, electric control valves offer advantages in remote operation. They can be integrated into remote monitoring systems, allowing for the remote monitoring and adjustment of valve status from a distant location. This remote operation feature is highly useful for large industrial systems and applications that require real-time monitoring, enhancing convenience and efficiency.

Additionally, these valves have a strong capability for rapid response. Electric actuators can quickly respond to control signals to adjust the valve's position, ensuring instant process adjustments. This is crucial for processes that need to react swiftly to changes, contributing to maintaining production stability.

Lastly, electric control valves find widespread use across various application areas. They are commonly found in industrial automation systems, such as chemical plants, power stations, pharmaceutical facilities, and petrochemical industries, used for adjusting fluid parameters. Simultaneously, they are also employed in HVAC systems to control the flow of cooling and heating water to maintain indoor temperatures. Furthermore, electric control valves play a critical role in the field of water treatment, ensuring control of water flow and pressure in wastewater, water supply, and sewage treatment systems. In food and beverage production, these valves are used to control the flow of liquid food, ensuring product quality and compliance with hygiene standards.

HONGSEN DHV Motorized Regulating Valve Designed For Refrigeration System


In summary, electric control valves are indispensable components in industrial automation. By providing precise control over fluid flow, pressure, and temperature, they ensure the stability and reliability of industrial processes, meeting various production and environmental requirements. In our valve product line, electronic expansion valves, solenoid valves, thermal expansion valves, and electric control valves all offer outstanding features and performance. We are fully aware of their importance in industrial production and are committed to providing customers with top-quality solutions to advance and progress the industrial sector together.

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