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What valve is suitable for laboratory refrigeration system?

January 03,2024

Laboratory refrigeration systems play a vital role in many laboratories such as scientific research and medicine. As one of the core components of the refrigeration system, valves play an important role in controlling fluid flow and pressure. This article will explore the characteristics and selection factors of valves suitable for laboratory refrigeration systems, and introduce several common valve types and their applicable scenarios.

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Part 1: Characteristics and requirements of laboratory refrigeration systems 

Wide temperature range

The temperature range of laboratory refrigeration systems is usually wide, ranging from low temperature to normal temperature. Therefore, valves suitable for laboratory refrigeration systems need to have good low-temperature resistance and be able to maintain stable control of fluids at different temperatures.

Precise flow control

Laboratory refrigeration systems have high requirements for precise flow control. They require valves that can respond quickly and accurately adjust the flow and pressure of the fluid, and provide stable flow output when different experiments require it.

Good sealing performance

Laboratory refrigeration systems often need to handle some hazardous substances or expensive experimental samples, so the valves need to have good sealing performance to prevent leakage and contamination. In addition, the valve should be able to withstand high pressure and high vacuum environments.


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Part 2: Valve selection factors for laboratory refrigeration systems

Temperature range and low temperature resistance

Considering the wide temperature range of laboratory refrigeration systems, attention should be paid to low temperature resistance when selecting valves. Generally, metal valves such as stainless steel valves, copper valves, etc. can work at lower temperatures, while plastic valves such as polytetrafluoroethylene (PTFE) valves have better tolerance to low temperatures.

Flow control accuracy and regulation performance

The laboratory refrigeration system has high flow control accuracy, so valves with good regulating performance should be selected. Electric valves and pneumatic valves usually respond quickly and provide precise flow regulation, and are suitable for laboratory refrigeration systems with high control requirements.

Sealing performance and corrosion resistance

Laboratory refrigeration systems  often need to handle hazardous substances or expensive experimental samples, so the sealing performance of the valve is crucial. Metal valves such as stainless steel valves usually have good sealing performance and corrosion resistance, and are suitable for handling corrosive media. Polytetrafluoroethylene (PTFE) valves have excellent corrosion resistance and are suitable for handling media such as strong acids and alkalis.


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HONGSEN DHV Motorized Regulating Valve Designed For Refrigeration System

Part 3: Common valve types suitable for laboratory refrigeration systems

3.1 Electric valve

Electric valves use electric actuators to operate the valves, and achieve precise control of the fluid by controlling the opening and closing of the electric actuators. This type of valve usually has the advantages of fast response, high-precision flow regulation, and remote operation. In laboratory refrigeration systems, it is especially suitable for occasions where precise control of flow and pressure is required, and can meet the demand for high flow control accuracy.

3.2 Pneumatic valve

Pneumatic valves use pneumatic actuators to control the opening and closing of valves and regulate fluid flow. They have the characteristics of fast response and high reliability. This type of valve is widely used in laboratory refrigeration systems, especially in scenarios that require frequent operations and large flow adjustments. The operation of pneumatic valves can be controlled centrally through the central control system, improving the overall efficiency and convenience of the laboratory refrigeration system.

3.3 Stainless steel valve

Stainless steel valves are made of corrosion-resistant stainless steel, have good corrosion resistance and sealing performance, and are suitable for handling various media. In laboratory refrigeration systems, stainless steel valves are often used in low-temperature environments, such as liquid nitrogen refrigeration systems, to work stably and reliably and ensure fluid control effects.


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3.4 Polytetrafluoroethylene (PTFE) valve

Polytetrafluoroethylene (PTFE) valves have excellent acid, alkali and corrosion resistance and are suitable for handling corrosive media such as strong acids and alkalis. This type of valve is commonly used in laboratory refrigeration systems that need to handle corrosive media, and can ensure the safe and stable operation of the system.

The above are several common valve types and their characteristics suitable for laboratory refrigeration systems. When selecting a suitable valve type, the specific needs and working environment of the laboratory refrigeration system should be comprehensively considered to ensure the stable operation of the system and the smooth progress of the experiment.


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Part 4: Conclusion

Valves suitable for laboratory refrigeration systems should have low temperature resistance, precise flow control, good sealing performance and corrosion resistance. Electric valves and pneumatic valves can usually meet laboratory refrigeration systems that require high flow control accuracy; stainless steel valves and polytetrafluoroethylene (PTFE) valves are suitable for handling general media and corrosive media respectively. When selecting a valve suitable for the laboratory refrigeration system, factors such as temperature range, flow control accuracy, sealing performance and medium characteristics need to be comprehensively considered to ensure the normal operation of the refrigeration system and the smooth progress of the experiment.


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