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.
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Cryogenic control valve Parameters
| Valve Body Parameters | Details |
|---|---|
| Valve Body Type | Straight - through Cast Ball Valve |
| Nominal Diameter | DN25 - 300mm |
| Nominal Pressure | PN1.6, 2.5, 4.0, 6.4 |
| Flange Standard | GB/T9113, JB/T79 |
| Connection Type | Flange (FF, RF, RTJ), Welding (SW, BW) |
| Bonnet Type | Low - temperature type: - 10 - 196℃, Ultra - low - temperature type: - 196 - 250℃ |
| Gland Type | Bolt - pressed type |
| Sealing Packing | Metal - graphite wound gasket, Flexible graphite, Carbon fiber packing |
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:
1. 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.
2. Actuator Action: Based on the temperature signal from the sensor, the actuator will perform a corresponding action, driving the valve core to move within the valve body.
3. 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.
4. Feedback Control: Cryogenic control valves also have a feedback control function, which can feed back the actual flow rate 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:
1. 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.
2. Automatic Adjustment: Equipped with sensors and actuators, cryogenic control valves can automatically adjust the flow rate, reducing the burden on operators.
3. 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.
4. 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 the application of liquefied natural gas.
Cryogenic Control Valves factory
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