DQ41F Cryogenic Ball Valve OverviewThe DQ41F Cryogenic Ball Valve is a specialized valve designed for ultralow-temperature media such as liquefied natural gas (LNG), liquid oxygen, liquid nitrogen, and liquid hydrocarbons. It features a flanged connection and is available in either a fixed-ball or floating-ball design. The valve body and critical components are constructed from austenitic stainless steel or low-temperature alloy steel, which undergo deep cryogenic treatment to ensure excellent toughness at temperatures as low as -196°C and below.The valve achieves opening and closing through a 90-degree rotation of the ball and incorporates a specially designed low-temperature sealing pair that maintains reliable sealing even under severe thermal cycling. An extended bonnet is integrated into the design to isolate the cold source, protecting the stem packing and actuation mechanism. Widely used in LNG terminals, air separation plants, cryogenic storage and transportation, and chemical processing, this valve serves as a critical safety isolation device in ultralow-temperature pipeline systems.DQ41F Cryogenic Ball Valve Product Image

Q567H Cryogenic Top-Entry Ball Valve Overview The Q567H Cryogenic Top-Entry Ball Valve is specifically designed for extreme low-temperature applications down to -196°C and below, handling media such as liquefied natural gas (LNG), liquid hydrogen, and liquid helium. Its unique top-entry body structure and extended bonnet design enable online maintenance and rapid replacement of internal components. Critical parts are made from cryogenically treated austenitic stainless steel and paired with metal sealing surfaces, ensuring sealing reliability, geometric stability, and long service life under ultra-low temperature conditions. It is suitable for demanding fields such as aerospace fuel filling, large-scale LNG storage and transportation, and advanced scientific research experiments, where stringent safety and maintainability requirements must be met.Q567H Cryogenic Top-Entry Ball Valve Product Image

the Q41F Integral Cryogenic Ball Valve Overview The Q41F integral Cryogenic ball valve is specifically designed for Cryogenic media conditions at -46°C and below, such as liquefied natural gas (LNG), liquid oxygen, and liquid nitrogen. It features an integral valve body structure and an extended valve cover design to ensure sealing reliability and prevent frosting. The valve seat is made of reinforced polytetrafluoroethylene (PTFE) or metal materials, combined with a precision-ground ball, to achieve bidirectional sealing and low leakage rates. Suitable for applications in petrochemical, air separation, and cryogenic storage and transportation fields, it maintains stable operation and a long service life in deep cold environments.Q41F Integral Cryogenic Ball Valve Product Image

DQ41F Forged Stainless Steel Cryogenic Ball Valve OverviewThe DQ41F Forged Stainless Steel Cryogenic Ball Valve is a high-performance ball valve specifically designed for cryogenic services. It features a forged stainless steel body and a flanged connection. This valve is suitable for ultra-low temperature media such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid argon, and liquid ethylene.The valve body and key components are manufactured from forged stainless steel materials such as F304 and F316L. These components undergo a rigorous deep cryogenic treatment process, where rough-machined parts are immersed in a cooling medium for several hours (typically 12 hours) to relieve internal stresses. This ensures excellent low-temperature toughness and dimensional stability at temperatures as low as -196°C.The valve incorporates an extended bonnet design, which positions the stuffing box away from the cold zone. This prevents the packing from freezing and mitigates valve stem seizure, ensuring flexible and reliable operation. The sealing surfaces between the ball and the valve seat utilize PTFE or other specialized soft sealing materials suitable for cryogenic applications. The valve operates by rotating the ball 90 degrees to open or close.This valve is widely used in LNG terminals, air separation units, cryogenic storage and transportation systems, and low-temperature installations in the petrochemical industry. It is a critical piece of equipment for achieving reliable shut-off under ultra-low temperature working conditions.Forged Stainless Steel Cryogenic Ball Valve DQ41F Product Image

DQ347H Three-Piece Cryogenic Ball Valve Overview The DQ347H Three-Piece Cryogenic Ball Valve is a high-performance ball valve specifically engineered for cryogenic services. It features a three-piece body construction and is operated by a worm gear drive. This valve is suitable for ultra-low temperature media such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid argon, and liquid ethylene.The valve utilizes a three-piece bolted body construction, consisting of two end pieces and a central body section. This design facilitates easy online maintenance and replacement of sealing components without removing the entire valve from the pipeline. The valve body and key components are manufactured from materials such as LCB low-temperature carbon steel, CF8 stainless steel, or forged stainless steel (F304/F316L). These components undergo deep cryogenic treatment to eliminate residual stresses, ensuring excellent low-temperature toughness and dimensional stability at temperatures as low as -196°C.The valve incorporates an extended bonnet design, which positions the stuffing box away from the cold zone. This prevents the packing from freezing and mitigates valve stem seizure, ensuring reliable operation.This valve is widely used in LNG terminals, air separation units, cryogenic storage and transportation systems, and low-temperature installations in the petrochemical industry. It is a critical piece of equipment for achieving reliable shut-off under ultra-low temperature working conditions.DQ347H Three-Piece Cryogenic Ball Valve Product Image

DQ361H Top-Entry Cryogenic High-Pressure Ball Valve Overview The DQ361H Top-Entry Cryogenic High-Pressure Ball Valve is a high-performance ball valve designed with a top-entry structure, specifically developed for cryogenic and high-pressure operating conditions. It is suitable for media at -196°C, such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid helium, and liquid ethylene.The valve features a one-piece body construction with a top bonnet connection. This design allows for online maintenance, enabling the removal of internal core components such as the stem, ball, and seats from the top without dismantling the valve from the pipeline. The pressure-containing parts are manufactured from high-strength cryogenic alloy steel or forged stainless steel. Prior to final machining, all components undergo a deep cryogenic treatment process: parts are immersed in a liquid nitrogen chamber, cooled to -192°C, held at that temperature, and then removed. This cycle is repeated twice to relieve residual stresses, ensuring material stability and performance under cryogenic temperatures.This valve is widely used in critical systems requiring high reliability and ease of online maintenance, including LNG terminals, air separation units, and cryogenic high-pressure pipelines.DQ361H Top-Entry Cryogenic High-Pressure Ball Valve Product Image

DQ961F Electric Cryogenic Ball Valve OverviewThe DQ961F Electric Cryogenic Ball Valve is a specialized ball valve designed for ultra-low temperature media down to -196°C, such as Liquefied Natural Gas (LNG), liquid oxygen, liquid nitrogen, liquid argon, and liquid ethylene. It features an electric actuator for operation and is configured with butt-weld ends for connection.The valve body and key components are manufactured from 304 stainless steel or low-temperature alloy steel forgings. These components undergo deep cryogenic treatment to eliminate residual stresses: rough-machined parts are immersed in liquid nitrogen, cooled to -196°C, held at that temperature for a specified period, and then removed. This cycle is repeated to ensure dimensional stability and mechanical performance of the materials under ultra-low temperatures.The valve incorporates an extended bonnet design, which positions the stuffing box away from the cold zone, preventing the packing from freezing and mitigating valve stem seizure. The ball features pressure relief holes that connect the valve cavity with the pipeline inlet, preventing abnormal pressure buildup caused by medium vaporization.This valve is widely used in LNG terminals, air separation units, cryogenic storage and transportation systems, and low-temperature installations in the petrochemical industry. It is a critical piece of equipment for achieving automated shut-off control under ultra-low temperature working conditions.DQ961F Electric Cryogenic Ball Valve Product Image

DQ340Y Cryogenic Top-Entry Flanged Ball Valve Overview The DQ340Y cryogenic top-entry flanged ball valve is a high-performance ball valve specifically designed for ultra-low temperature media such as liquefied natural gas (LNG), liquid oxygen, liquid nitrogen, and liquid helium. It features a top-entry design and flanged connections.The valve body is constructed from austenitic stainless steel or low-temperature alloy steel and undergoes deep cryogenic treatment to eliminate residual stress. This ensures excellent low-temperature toughness and dimensional stability at temperatures down to -196°C and below.Its core characteristic is the top-entry design, which allows the internal trim components (ball, seats, stem) to be removed from the top for maintenance without taking the valve out of the pipeline. The flanged connections facilitate easy installation and removal. The valve utilizes a trunnion-mounted ball design with metal-to-metal hard sealing. A worm gear operator drives the ball through a 90-degree rotation for opening and closing.This valve is widely used in LNG terminals, air separation units, cryogenic storage and transportation systems, and ultra-low temperature equipment in the petrochemical industry. It is a critical shut-off device in applications requiring reliable sealing and ease of in-line maintenance.DQ340Y Cryogenic Top-Entry Flanged Ball Valve Product Image