Cryogenic control valves are control valves that operate in low-temperature environments, primarily used to control the flow and pressure of cryogenic media. Their working principle is similar to that of ordinary control valves, both adjusting the flow rate of the medium by changing the valve core opening, thereby achieving pressure control.
However, due to the special characteristics of cryogenic environments, cryogenic control valves have higher requirements in material selection, structural design, and sealing methods. Their core function is to precisely control the flow of cryogenic media and achieve stable process parameters.
GNEE Group is a leading manufacturer of industrial valves, providing valve solutions and customization services to customers worldwide. Valve Installation Support – Book a Site Visit!
Low-Temperature Control Valve Technical parameters
Design and manufacturing:GB/T 12235, ASME B16.34, IEC 60534
The structural length: GB/T 12221, ASME B16.10
Connection forms:HG/T 20592-20605, GB/T 9112-9124, ASME B16.5
Inspection and test:GB/T 13927, API 598, IEC 60534-4
Caliber:1/2″ ~ 24″ (DN15 ~ DN600)
Pressure temporature level:ASME B16.34, GB/T 12224
Drive mode: Self-Operated
Pressure:PN1.6 MPa ~ PN40 MPa Class 150 ~ Class 2500
Working Principle of a Cryogenic Control Valve
A cryogenic control valve mainly consists of a valve body, valve core, actuator, and sensor. Its working principle can be summarized in the following steps:
Sensor Detection: Cryogenic control valves are typically equipped with a temperature sensor to monitor the medium temperature in real time and transmit the signal to the actuator.
Actuator Action: Based on the temperature signal from the sensor, the actuator will perform corresponding actions, driving the valve core to move within the valve body.
Flow Regulation: The movement of the valve core changes the flow area inside the valve body, thereby regulating the flow rate of the fluid medium. When the temperature is lower than the set value, the valve core will move in the opening direction, increasing the flow area and increasing the flow rate; conversely, when the temperature is higher than the set value, the valve core will move in the closing direction, decreasing the flow area and reducing the flow rate.
Feedback Control: Cryogenic control valves also have a feedback control function, which can feed back the actual flow situation to the control system to adjust the actuator's action in a timely manner, ensuring precise flow control.
Functions of Cryogenic Control Valves
The functions of cryogenic control valves are mainly reflected in the following aspects:
- Precise Control: Cryogenic control valves can precisely control the flow rate of fluid media according to actual needs, ensuring the stability and accuracy of system temperature.
- Automatic Adjustment: Equipped with sensors and actuators, cryogenic control valves can automatically adjust the flow rate, reducing the burden on operators.
- Safety Protection: In refrigeration, liquefied natural gas (LNG) and other fields, cryogenic control valves also play a safety protection role. When the system temperature rises or falls abnormally, the control valve can quickly adjust the flow rate to prevent equipment damage or safety accidents.
- Energy Saving and Emission Reduction: Precise flow control can help the system achieve a higher energy efficiency ratio, thereby reducing energy consumption and emissions. Cryogenic control valves play an important role in this aspect, providing strong support for green refrigeration and LNG applications.
Applications of Cryogenic Control Valves
Cryogenic control valves are widely used in various cryogenic processes, such as:
1. Petrochemical Industry: Used to control the flow rate and pressure of cryogenic media such as liquefied petroleum gas (LPG), ethylene, and propylene in cryogenic separation and reaction processes, ensuring the stability and safety of the production process.
2. Natural Gas Liquefaction Industry: Used to control the flow rate and pressure of liquefied natural gas (LNG) in the natural gas liquefaction process, ensuring the efficiency and safety of the liquefaction process.
3. Food Freezing Industry: Used to control the flow rate and pressure of refrigerant in the food freezing process, ensuring the uniformity and efficiency of the food freezing process.
4. Air Separation Industry: Used to control the flow rate and pressure of liquid air in the air separation process, ensuring the stability and safety of the air separation process.
5. Scientific Research Field: Used to control the flow rate and pressure of cryogenic media in cryogenic experiments and research, ensuring the accuracy and reliability of the experiments.
Low-Temperature Control Valve factory
