How to Achieve Long-Term Stable Operation of EVR Solenoid Valves?

In today's rapidly developing global refrigeration and heating, ventilation, air conditioning (HVACR) industry, refrigeration systems are widely used in food cold chain, commercial refrigerators, ice-making equipment, pharmaceutical storage and transportation, industrial cooling, and central air conditioning projects. As people's demands for food safety, environmental comfort, and industrial production stability continue to increase, higher standards are being set for the reliability, energy efficiency, and automation control levels of refrigeration systems.

During the operation of a refrigeration system, the flow and on/off control of the refrigerant is a core factor affecting equipment performance, and the EVR solenoid valve is a key component for achieving this function. It directly relates to the system's operational stability, energy efficiency, and equipment lifespan. As a widely used type of solenoid valve in the industry, the EVR series solenoid valve has become the mainstream choice in refrigeration automatic control systems due to its wide refrigerant compatibility, sensitive opening and closing, and reliable pressure resistance.

In recent years, with the global expansion of cold chain logistics and the rapid growth of large supermarkets and fresh food e-commerce, the overall demand for refrigeration equipment has shown a continuous upward trend. At the same time, various countries have successively introduced environmentally friendly refrigerant policies and energy-saving standards, which are also driving the upgrading of refrigeration systems from traditional operation modes to intelligent and refined management. Enterprises and contractors prefer control components that offer stable operation, low maintenance costs, and long lifespans to reduce frequent downtime and after-sales burdens.

Against this market backdrop, the demand for EVR solenoid valves is steadily increasing. Whether in new refrigeration projects or in the market for energy-saving retrofits and replacements of existing systems, the procurement ratio of high-performance EVR solenoid valves continues to grow. Simultaneously, more and more equipment manufacturers are choosing to configure EVR series products with customizable specifications, high pressure resistance, and longer coil life to ensure product competitiveness and operational stability.

The expansion of the refrigeration industry, the upgrading of equipment to intelligent systems, and the promotion of energy-saving and environmental protection policies will continue to drive the growth in market demand for EVR solenoid valves.

1. Definition and Function of EVR Solenoid Valves

EVR solenoid valves are a type of fluid on/off control element specifically designed for refrigeration and air conditioning systems. They control the movement of the valve core by energizing/de-energizing a coil, achieving automatic control of refrigerant flow. They play a crucial on/off regulating role during system operation, directly impacting refrigeration efficiency, system stability, and equipment lifespan.

Wide Range of Applications

EVR series solenoid valves can be applied to various refrigeration equipment and industrial cooling systems, including:

• Cold storage and cold chain transportation systems
  
  
• Supermarket display cases, convenience store freezers, fresh food preservation equipment
  
  
• Ice makers, beverage coolers, ice cream machines, and other food processing equipment
  
  
• Central air conditioning circulation systems and large chilled water units
  
  
• Industrial circulating cooling and factory temperature control systems
  
  

Their excellent applicability and stability make them a standard selection in engineering projects and equipment manufacturing.

Compatible with Multiple Refrigerants, Highly Compatible

EVR solenoid valves are compatible with a variety of mainstream refrigerants, including R22, R134a, R404A, R410A, R407C, and R507, meeting the pressure ratings and temperature requirements of different refrigeration systems. Their versatility and ease of replacement make them suitable for both new equipment production and upgrades of existing systems.

Complete Range of Specifications to Meet Diverse Engineering Needs

The EVR series covers a variety of interface sizes and pipe diameters, suitable for systems with different cooling capacities and piping layouts. Whether it's light-duty, small-capacity refrigeration equipment or large industrial refrigeration plants and centralized refrigeration systems, a matching model can be found. OEM and customization are also supported to meet the needs of equipment manufacturers and bulk projects.

As a core control component in refrigeration automatic control systems, EVR solenoid valves not only perform fluid control functions but also significantly impact system energy efficiency, operational reliability, and maintenance costs. Their stable performance, high compatibility, and long lifespan make them a long-term trusted solution for refrigeration equipment manufacturers, refrigeration engineering installers, and after-sales maintenance service providers.

2. Structural Features and Performance Advantages of EVR Solenoid Valves

2.1 High-Strength Valve Body Structure, Strong Pressure Resistance

EVR solenoid valves are manufactured using high-quality copper valve bodies or corrosion-resistant alloy materials. The valve body undergoes precision machining and sealing surface grinding, ensuring stable operation in high-pressure refrigeration systems and minimizing refrigerant leakage. Its high structural strength and strong internal pressure resistance make it suitable for various operating environments, including commercial refrigeration, industrial refrigeration, and cold chain equipment.

2.2 High Coil Insulation Class, Reliable High-Temperature Resistance

The coil section utilizes high-temperature insulation materials and a fully enclosed coil housing design, effectively preventing the intrusion of moisture, oil, and dust, reducing the risk of coil burnout. Even under frequent start-stop conditions in refrigeration systems, EVR solenoid valves maintain stable operation for extended periods, significantly reducing maintenance and replacement costs.

2.3 Fast Opening/Closing Response, High Control Precision

EVR series solenoid valves feature a sensitive valve core and a highly efficient magnetic drive structure, enabling rapid action upon receiving on/off signals. This allows for quick cutting off or opening of refrigerant flow, effectively ensuring flow control accuracy and system operational stability during the refrigeration cycle.

2.4 Wear-resistant internal sealing components extend service life

Key structural components such as the valve core and sealing gaskets are made of wear-resistant and low-temperature-resistant materials, capable of withstanding the long-term impact flow environment of refrigerant, reducing wear, and extending overall service life. During maintenance, the valve body and coil can be replaced separately, improving maintenance efficiency.

2.5 Strong back pressure capacity, adaptable to complex operating conditions

EVR solenoid valves have strong back pressure tolerance, maintaining reliable operation even in scenarios involving rapid switching between high and low pressures, frequent start-stop operations, or large load changes, without jamming or leakage, meeting the operational requirements of commercial cold chain projects and large-scale refrigeration systems.

2.6 Complete range of models and specifications, easy installation and replacement

The EVR series covers a variety of models from small to large diameters, suitable for different cooling capacity levels and system structure designs. The products support multiple interface types (threaded/brazed/flange), offering strong adaptability and facilitating original parts replacement and system upgrades.

I. Why are EVR solenoid valves recommended for refrigeration systems?

EVR solenoid valves control the on/off state of refrigerant through electromagnetic actuation, playing a crucial role in multiple stages of system operation, including startup, shutdown, energy-saving regulation, and protection. Their function extends beyond simply actuating the system; they directly impact:

• The smoothness of the refrigeration cycle
• The energy efficiency of the compressor and equipment
• The stability of the system over long periods.
  
  

Therefore, selecting a stable solenoid valve is fundamental to ensuring the continuous operation of the refrigeration system.

Robust Structure and Outstanding High-Pressure Resistance: The EVR series valve body is constructed from high-strength copper or corrosion-resistant alloys, ensuring high-precision sealing. It maintains stable operation under high pressure and complex environments, minimizing the risk of refrigerant leakage. It is particularly suitable for cold storage systems, commercial cold chain logistics, and industrial refrigeration equipment.

High Coil Temperature Rating and Longer Lifespan: The coil is encapsulated with high-temperature resistant insulating materials, providing enhanced resistance to heat, moisture, and oil contamination. Even under frequent system start-ups and high-load operation, it maintains reliable operation for extended periods, fundamentally reducing maintenance and replacement costs.

Fast response, more precise system control: EVR solenoid valves offer sensitive opening and closing, enabling rapid refrigerant flow control. This ensures the refrigeration system maintains stable pressure and temperature under varying loads, improving overall system energy efficiency.

Compatible with multiple refrigerants, highly versatile: Supports various refrigerants including R22, R404A, R134a, R410A, R407C, and R507. Suitable for various system conditions in commercial, industrial, and cold chain transportation applications, offering high substitutability and wide versatility.

Complete range of models and specifications, convenient installation and maintenance: The EVR series covers different pipe diameters and connection types, directly replacing most common brand models, reducing system modification and maintenance complexity.

In numerous refrigeration engineering projects, EVR solenoid valves have demonstrated significant advantages in performance:

• Large-scale cold storage projects: Improved operational stability and significantly reduced refrigeration system failure rates.
  
  
• Supermarket cold chain equipment: Optimized energy efficiency and improved product preservation quality.
  
  
• Pharmaceutical storage and transportation: Improved temperature control accuracy, meeting stringent pharmaceutical storage standards.
  
  
• Industrial cooling systems: Reduced equipment downtime and enhanced production continuity.
  
  

These practical application examples fully demonstrate that EVR solenoid valves can bring long-term stable operational value to end customers.

II. What is the key role of EVR solenoid valves in cold storage and commercial refrigeration equipment?

In cold storage systems and commercial refrigeration equipment, precise temperature control, long operating times, and complex operating environments place extremely high demands on the stability and reliability of the refrigeration system. As a key control component in the refrigeration system, the main function of EVR solenoid valves is to control the flow of refrigerant, achieving automatic system adjustment and safety protection. They play a core role in cold storage, convenience store refrigerated display cases, fresh food display cases, refrigerators and freezers, ice-making systems, and food processing cold chain equipment.

1. Controlling Refrigerant Flow to Ensure Orderly System Operation

Cold storage and commercial refrigeration equipment rely on the circulation of refrigerant in the system piping to achieve refrigeration. The EVR solenoid valve controls refrigerant flow through the energization and de-energization of its coil:

• When energized, the valve opens, and refrigerant flows into the evaporator to begin absorbing heat and cooling;
  
  
• When de-energized, the valve closes, refrigerant circulation stops, and the system enters standby or protection mode.
  
  

This ensures reliable start-up, smooth shutdown, and load regulation during system operation.

2. Achieving Automatic Temperature Control and Improving Refrigeration Efficiency

Cold storage and freezers are typically equipped with thermostats or PLC control systems. The EVR solenoid valve is linked to these systems, automatically opening or closing the refrigeration circuit according to the set temperature, achieving:

• Maintaining the temperature within the set range
• Preventing excessive temperature fluctuations from affecting food preservation
• Optimizing operating time and reducing energy costs
  
  

Therefore, it is the core actuator for the "automatic temperature control" function of the refrigeration system.

3. Protects Compressor and System Equipment, Extending Service Life

When system abnormalities occur, such as:

• Excessive pressure
• Excessive temperature
• Insufficient condenser heat dissipation
  
  

Equipment enters a shutdown protection state. The EVR solenoid valve will immediately close the refrigerant passage, preventing problems such as liquid slugging, overload, and high-pressure expansion, effectively protecting:

• The compressor
• The piping system
• The evaporator and expansion valve assembly
  
  

Thus extending system life and reducing downtime due to malfunctions.

4. Improves the Quality Stability of Cold Chain Food and Commodity Storage

In cold storage, display cases, and food storage and transportation systems, temperature stability determines product quality.

The EVR solenoid valve ensures:

• Longer food preservation time
• Smaller temperature and humidity fluctuations
• Prevents moisture loss, surface frost, or spoilage due to refrigeration fluctuations
  
  

For applications such as fresh food supermarkets, cold chain logistics centers, and chain convenience stores, it directly relates to commercial losses and product value.

5. Supports energy-saving system operation and reduces operating costs

Thanks to its fast opening and closing response and precise control, EVR solenoid valves allow the system to cool on demand, avoiding prolonged high-load operation of the compressor, thereby:

• Reducing power consumption
• Reducing maintenance frequency
• Reducing operating costs
  
  

This advantage is particularly significant for cold storage systems with long operating cycles.

III. What are the differences between EVR series and ordinary solenoid valves when selecting solenoid valves?

In refrigeration systems, cold storage, commercial freezers, and industrial cooling equipment, solenoid valves are core control components, and their performance directly affects the system's stability, energy efficiency, and service life. Compared to ordinary solenoid valves, the EVR series solenoid valves have several significant advantages, making them the first choice for refrigeration equipment and engineering projects.

1. Material and Structural Differences

EVR Solenoid Valves: The valve body is made of high-strength copper or corrosion-resistant alloy materials, with precision-machined sealing surfaces. They are pressure-resistant, corrosion-resistant, and adaptable to complex operating environments.

Ordinary Solenoid Valves: Mostly use low-cost copper or ordinary alloy materials. Their pressure resistance and sealing accuracy are relatively low, and they are prone to leakage or damage under long-term high-pressure environments.

2. Coil Performance Differences

EVR Series: Uses high-temperature insulated coils, which are moisture-resistant, oil-resistant, and high-temperature resistant, adaptable to the frequent start-stop operation of refrigeration systems, and have a long service life.

Ordinary Solenoid Valves: The coil has a low temperature resistance rating, making them prone to burnout under high loads or prolonged operation, resulting in high maintenance costs.

3. Opening/Closing Response and Control Accuracy

EVR Solenoid Valves: The valve core is sensitive, with fast opening and closing speeds, enabling precise refrigerant flow control and ensuring stable system temperature.

Ordinary Solenoid Valves: The valve core response is slow, resulting in low control accuracy. Temperature fluctuations or unstable system pressure may occur under varying loads.

4. Compatibility and Versatility

EVR Series: Supports multiple refrigerants (R22, R134a, R404A, R410A, R407C, R507), with a complete range of models and specifications, adaptable to various pipe diameters, pipe interfaces, and system layouts.

Ordinary Solenoid Valves: Limited refrigerant compatibility, fewer specifications, and poor compatibility during system modification or replacement.

5. Reliability and Maintenance Costs

EVR Solenoid Valves: Optimized structure, wear-resistant sealing components with long lifespan, reducing maintenance frequency and extending the overall system lifespan.

Ordinary Solenoid Valves: Prone to leaks, valve core jamming, and other malfunctions, resulting in higher maintenance and replacement costs over long-term operation.

1. Precautions for replacing and repairing EVR solenoid valves when maintaining a refrigeration system

In cold storage, commercial freezers, and industrial refrigeration systems, EVR solenoid valves are critical control components, directly affecting refrigerant flow, system stability, and equipment lifespan. Proper replacement and maintenance methods not only ensure system safety but also extend equipment lifespan. The following are key precautions:

2. Power Disconnection and Pressure Release are the First Steps

• Disconnect System Power: Before replacing or repairing the EVR solenoid valve, always turn off the refrigeration system power to prevent electric shock or accidental power-on startup.
  
  
• Release System Pressure: Release the pressure in the refrigeration piping to a safe range to prevent refrigerant leakage that could cause injury or equipment damage.
  
  

3. Installation Position and Orientation

• Maintain the correct valve body installation orientation: EVR solenoid valves usually have flow direction markings; install them according to the refrigerant flow direction.
  
  
• Avoid inverted or reverse installation: Otherwise, the valve core may become stuck or fail to open properly.
  
  

4. Cleaning and Environmental Inspection

• Pipeline Cleaning: Before replacing the valve body, ensure that the piping is free of impurities, metal shavings, or welding slag to avoid damaging the valve core or seals.
  
  
• A Clean Surrounding Environment: Prevent dust, oil, or moisture from entering the valve body and coil to improve valve lifespan.
  
  

5. Electrical Connection Check

• Confirm Coil Voltage Specifications: The EVR solenoid valve coil specifications must match the system power supply (e.g., AC220V, DC24V, etc.).
  
  
• Check Wiring Securely: Avoid loose connections or short circuits that could cause coil burnout or abnormal operation.
  
  
• Insulation Test: After long-term use, perform a coil insulation resistance test to ensure safety and reliability.
  
  

6. Valve Core and Seal Inspection

• Valve Core Flexibility: Manually push or test the valve to check for jamming.
  
  
• Seal Integrity: Replace any worn, aged, or cracked seals to ensure no refrigerant leakage.
  
  

7. System Trial Run

• Slow Pressurization: After replacement, slowly charge the refrigerant and observe whether the valve operates normally.
  
  
• Leak Check: Test the valve body and interface sealing using soapy water or nitrogen.
  
  
• Operational Monitoring: Briefly observe the system's start-up, shutdown, and circulation status to confirm smooth valve opening and closing.
  
  

8. Regular Maintenance Recommendations

• Regularly clean the valve body and piping: reduce impurity accumulation and ensure sensitive valve operation.
  
  
• Periodically inspect the electrical components: coil insulation and voltage stability.
  
  
• Replace worn parts: such as seals, valve cores, and other easily worn components to ensure long-term stable system operation.
  
  

EVR solenoid valves, with their high-strength valve bodies, high-temperature resistant coils, sensitive opening and closing, and wide adaptability, play an irreplaceable core role in cold storage, commercial refrigeration equipment, and industrial cooling systems. They not only ensure the stable operation and temperature control accuracy of refrigeration systems but also effectively extend equipment lifespan, reduce maintenance costs, and provide reliable guarantees for energy conservation and emission reduction for enterprises.

As the trend towards intelligent and energy-efficient systems continues to accelerate in the refrigeration industry, the EVR series solenoid valves will continue to be the preferred solution for refrigeration system optimization, equipment upgrades, and engineering renovations, helping various refrigeration projects achieve efficient, safe, and sustainable development.