What is Cryogenic Control Valve
Cryogenic control valve are used to control the flow of fluid through piping. They are often called “cryo” valves because they operate at shallow temperatures below -100℃(-212℉), which allows for greater control over the system’s operation.They are relatively inexpensive compared to other types. They require no special tools to install. But if in case you are not cautious, they can be hazardous. This is because they can leak liquid nitrogen into the atmosphere and thus pose an inhalation hazard. On the other hand, they can precisely control fluid flow through the pipeline by using a valve sensitive enough to detect small amounts of pressure on its surface.
Ability to handle extremely low temperatures
One of the main advantages of cryogenic control valves is their ability to handle extremely low temperatures. Designed to withstand the challenges posed by cryogenic fluids such as liquid nitrogen, oxygen and liquefied natural gas, these valves are constructed from materials capable of maintaining mechanical properties in sub-zero conditions. This ensures valve integrity and reliability even in the harshest cryogenic environments.
Engineered to prevent leaks
Cryogenic control valves are engineered to prevent leaks and ensure the safety of personnel and the environment. The low temperatures involved in the cryogenic process can cause traditional valves to become brittle or prone to leaks, but cryogenic valves are specifically designed with tight seals and sturdy construction to prevent any potential leaks. This feature is essential to prevent hazardous situations and protect surrounding infrastructure.
Ability to withstand thermal shock
Another significant advantage of cryogenic control valves is their ability to withstand thermal shock. Cryogenic fluids often move between different temperature zones, which can cause rapid fluctuations in pressure and temperature. These valves are specifically designed to handle this type of thermal shock, preventing damage and maintaining reliable operation throughout the transition.
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Types of Cryogenic control Valves
Cryogenic Butterfly Valves
The triple-offset butterfly valve is an ideal option for cryogenic service. This is due to its non-friction, metal-to-metal seal that provides bubble-tight shut-off and the long-term integrity of the sealing mechanism. Additionally, they offer quick opening and closing action and are the ideal choice for remote operation. Butterfly valve provides such an example – with excellent shutoff capabilities, low torque, and reduced wear benefit.
Cryogenic Globe Valves
These valves have a spherical shape with a disc that rotates 90° to the plane of its body seat. Therefore, it provides effectiveness for long-term sealing. However, they may not resist erosion for long and are not recommended for systems with high flow rates. Ideally, globes should be provided with a full Stellite valve trim to protect against erosion. Cryogenic fluids tend to lose their lubricity, and the Stellite helps to reduce the wear and tear on the valve.
Cryogenic Ball Valves
The most common valves for liquid gas applications are the double-seal ball valves . Generally, they offer better flow characteristics than globe valves. Also, they are very efficient in providing a tight seal. They also incorporate a vapor space of sufficient height that allows gasification in the area below the gland. Consequently, this keeps the gland packing near the ambient temperature as thermal conductivity between the inside and outside of the valve is limited. Yet, due to wear concerns along the seals and the ball, they find preference in applications with an unrestricted flow path.
Cryogenic Gate Valves
A typical cryogenic gate valve has a wedge-shaped gate, which opens and closes in line with the mating body seat. As a result, there is minimal pressure drop when in a fully open position. Thus, it provides desirable flow characteristics. However, gates are more difficult and expensive to actuate in comparison to butterfly valves, especially as their size increases, so they are not ideal for remote operation. Gates can be prone to wear and tear if they are subject to often repeated opening and closings. An advantage gate valves have is that due to the metal-to-metal sealing surfaces, they are not subject to the cold flow that Teflon seals in ball valves tend to see.
Ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum, and other liquid media the cryogenic valve transfers are flammable and explosive. What is more, they are going to gasify and expand hundreds of times when the temperature rises.
This kind of valve is always equipped with an extended bonnet or namely extended stem. That’s because:
The extended bonnet can prevent the stuffing box, which plays an important role in the cryogenic valve and other valves, from the damage of low temperature.
As the temperature goes down, the packing will gradually become less elastic and lost its ability to prevent leakage. Then, medium freeze in the space between the packing and the stem, hampering the movement of the stem and scratching the packing as the stem moves. In the end, what follows is severe leakage.
Therefore，a extended stem is used to ensure that the packing is warm enough, at least above 8℃.
The extended structure of bonnet makes it convenient to wrap special materials around the valve, preventing the loss of cold energy.
The pipes and valves are often installed in the so-called 'cold box', but its 'long neck' can go through the wall of the 'cold box'. Based on that, the extended stem makes it convenient to dismantle or replace the main parts of the valve quickly through the bonnet.
Cryogenic Control Valve Applications
Industrial Gas Production
Cryogenic control valves manage liquid air separation, nitrogen, argon, and oxygen from production to storage and distribution. Flow control valves also regulate tanker loading and cylinder filling operations.
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Petrochemical Processing
Cryogenic hydrocarbon liquids rely on specialized valves for stable containment and flow control. Relief valves ensure safety by venting excess boil-off gasses.
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Liquefied Natural Gas (LNG)
Cryogenic globe valves and cryogenic ball valves suit LNG flows ranging from regasification plant piping to onboard storage on LNG carrier ships.
03
Cryogenic Ground Support Equipment
Space launch ground support depends on cryogenic control valves and piping to load rocket propellants like liquid hydrogen and oxygen with minimal losses.
04
Research Facilities
Cryogenic control valve systems help harness ultra-cold superconductivity effects for physics experiments and medical MRI superconducting magnets.
05
Temperature Rating
Cryogenic control valve temperature ratings must account for full service spans from ambient piping systems to the coldest cryogenic media handling without material embrittlement or seizing up. Common builds utilize stainless steels for moderate cryogen use down to -320℉5 while more exotic alloys suit extreme applications nearing absolute zero.
Pressure Management
Pressure ratings must sufficiently exceed maximum pressures within piping networks and storage vessels, incorporating safeguards like integrated relief valves to automatically vent expanding boil-off gasses before reaching dangerous overpressure states.
Cryogenic Media Compatibility
Valve builds need tailored compatibility to handle purity levels and reactive properties of flows ranging from inert gasses like nitrogen to hazardous rocket propellants. High-purity services also mandate precision welds and leak-tight sealing for minimal fluid contamination.
Flow Control Needs
Specify automated cryogenic control valves with electric or pneumatic actuation for precisely metering variable cryogen flows into manufacturing processes or loading operations. Or simplify with open/close manual valves for basic fluid batch transfers.
High Cycle Life
Mission-critical cryogenic control valves must withstand millions of lifetime duty cycles in high-use facilities, requiring reinforced stems and streamlined components resistant to friction and wear effects that can lead to premature fatigue failures.
Easy Maintenance
Seek modular designs permitting rapid seal replacements, component retrofits, and valve repairs to maximize production uptime. This facilitates maintenance without extensive piping system deconstruction.
Code Compliance
Adhere to pressure vessel governance, including ASME-B31.3 plus cryogenic standards from EN, API, and CGA 341, covering safety relief protections, materials, testing procedures, and quality controls.
Cryogenic Control Valve Standards
The MSS SP-134 is the cryogenic valve code used in North America. It provides comprehensive requirements for material, design, dimensions, fabrication, pressure testing, and non-destructive examination of valves with body/bonnet extensions.
BS 6364 has been developed as a British Standard for the design, manufacture and testing of valves for use in cryogenic applications. This standard ensures that these valves are manufactured and designed to the highest safety and quality standards, providing reliable and robust performance in extreme temperatures.
ASME 16.34 is an essential standard that outlines significant specifications for valve parts, such as flanges, threading, welding ends, and more. This standard ensures the safety and reliability of valves by providing requirements for pressure testing, material selection, flange removal, and electrical continuity. Furthermore, it specifies the nominal pipe size and marking requirements for pipes.
ISO 21011 is an international standard that provides comprehensive guidance and requirements for designing, manufacturing, and testing valves for the operation of cryogenic fluids. This standard covers operations at ambient to extreme cryogenic temperatures, ensuring the safety and reliability of any valve used in these applications. Additionally, the specifications guide any necessary modifications to valves to operate cryogenic fluids. With this standard, engineers and manufacturers can ensure the highest safety, reliability, and performance levels when working with cryogenic fluids.
How Do Cryogenic Control Valves Work
Cryogenic control valves are maintained naturally closed to protect and properly retain cryogenic gases or other mediums. A cryogenic control valve responds to high pressure by pushing into the open position, allowing the gas or other media to pass through easily. The open flow will last until the pressure decreases once more, at which time it swings back and seals with a unique metal seat bubble-tight shutdown to stop any leaking.
The external pressure has some influence on how well a cryogenic valve functions. A cryogenic control valve is typically maintained in a closed state. As a result, the media inside the valve will be kept inside and won’t leak into the atmosphere. These valves are precisely made to respond to pressure increases. The valve is pushed into the open position by increasing pressure, which causes the medium to flow. Until the pressure drops, this flow will continue.
Components Of Cryogenic Control Valve
The Body
The body is an essential component because it houses the moving parts that come into touch with the fluid and must withstand the pressure in the piping system. Steel in various shapes, patterns, and material grades can be cast or forged to create the body.
Bonnet
The stuffing box, crucial to the cryogenic valve, can be shielded from the harm caused by low temperatures by the expanded bonnet. The enlarged bonnet structure prevents cold energy loss by wrapping specific materials conveniently around the valve.
Actuator
A device that opens and closes the valve is called an actuator. It’s attached to the disc and stem assembly.
Disc
The disc is the component that, depending on its location, permits, throttles, or stops the flow. When a plug or ball valve is present, the disc is referred to as a plug or ball. Cast, forged, or manufactured valve discs are all possible. When the valve is closed, a disc is positioned against the seat or seats of the stationary valve.
Seat
This is one of the critical elements of the system that directly influences how quickly the valve leaks. Metal or non-metallic forged rings are essential components of the valve body. A seat or seats may be present on any valve. There is only one seat for the swing check valve and globe. The downstream seat is on the gate valve’s opposite side from the upstream seat, and vice versa. Multiple seats are possible in multipod club and ball valves, depending on the valve’s or plug’s port count.
Stem
According to the expanded stem, the packing must be sufficiently warm and above 8°C. It will ensure that the valve does not leak and works efficiently.
Valve Trim
Valve trim is the collective name for the detachable and replaceable internal valve components that come into contact with the flow medium. Because different materials require different qualities to survive different stresses and circumstances, valve trim pieces can be made from various materials.
The production of cryogenic control valves requires strict manufacturing processes, the participation of special equipment and strict quality control on the component processing. After special low-temperature treatment, the rough-machined parts need to be placed in the cooling medium for several hours (2-6 hours) to release the stress. This can ensure good performance of the material in low temperature conditions, and prevent the valve from leakage caused by deformation due to a change in temperature. The assembly of the valve is also different from that of the ordinary valve. The parts need to be strictly cleaned to remove any oil stains to ensure the perfect performance.
Due to the special structure of cryogenic control valves, the installation of cryogenic control valves also has special requirements. Because of the long-neck bonnet of the cryogenic valve, cryogenic gate valves must be installed vertically upward, with the stem direction within a 45-degree angle. And it should also be avoided as much as possible to install the valve on vertical pipelines. Otherwise, the low-temperature medium may fill the extended part of the valve cover, causing the valve packing to fail. In addition, it will transfer the cold to the valve handle, injuring the operator.
For cryogenic ball valves with pressure relief devices, extra attention should be paid to the requirements of the valve pressure relief direction during installation,. The direction of valve pressure relief should be marked on the process flow chart and noted in the pipeline axonometric drawing. If it is necessary to set an orifice but not set it, after the valve is closed, the liquid in the valve path will be heated and vaporized, which can easily burst the valve body. If the pressure relief is installed in the wrong direction, flammable or toxic media may be leaked to the operation and maintenance side.
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