CRYO-SERIES High-Performance Ultra-Low Temperature Long-Neck Ball Valve
Official Product Name: CRYO-SERIES 196-class Heavy-duty High-pressure Ultra-low Temperature Flanged Ball Valve (Extended Bonnet Cryogenic Ball Valve)
This product is specifically designed for extreme low temperatures, high-pressure cycling conditions, and harsh continuous industrial and commercial environments. Its structure has been reinforced to withstand the complex handling requirements of global cross-border supply chains, prolonged exposure to humid, hot, and salt-spray conditions in maritime containers, as well as severe vibration during transportation, fully complying with international mainstream engineering standards and import/export technical barriers.
Under ultra-low temperature conditions, when valve packing is in direct contact with cryogenic media, it becomes highly susceptible to loss of elasticity due to severe thermal contraction. Additionally, external moisture may condense into ice at the packing chamber, causing valve stem jamming. This valve employs a specially designed long-neck structure compliant with international standards. Leveraging the low thermal conductivity of gas within the long-neck tube, a stable vapor isolation layer is formed. The temperature of this vapor layer increases progressively from bottom to top, maintaining the upper packing chamber and operating mechanism at near-normal temperatures above 0°C, thereby completely preventing external leakage and freezing-induced blockages.
When the globe valve is closed, a portion of ultra-low temperature liquid remains in its internal chamber. As the valve temperature rises, this residual liquid rapidly vaporizes and causes significant volume expansion; failure to release it promptly may lead to permanent deformation of the chamber or even valve rupture. The valve seat features a one-way pressure relief hole that automatically releases pressure back to the inlet pipeline when the internal chamber pressure exceeds a predetermined threshold, ensuring safety during long-term international transportation and intermittent shutdown operations.
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Classification of Technical Indicators |
Range of industrial standard parameters |
Core Application Materials and Implementation Standards |
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Nominal pressure range |
PN16, PN40, PN64, PN100 to PN420/Class 150 to Class 2500 |
Meets the high-pressure explosion-proof wall thickness requirements specified in ASME B16.34/EN 12516 |
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Design Temperature Range |
The minimum temperature ranges from-196°C(liquid nitrogen zone) to-253°C(liquid hydrogen custom zone), and extends up to +120°C. |
The low-temperature impact toughness test is conducted in accordance with the ASTM A350 standard. |
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Material of the valve body/main pressure-bearing component |
ASTMA 351: CF8M (316 stainless steel), CF8 (304), low-carbon F316L, Monel alloy |
All materials have undergone extraordinary cyclic treatment involving solid solution formation and cryogenic stabilization. |
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Structure of the valve seat sealing pair |
Polymer wear-resistant materials such as PCTFE (KEl-F), VESPEL, or tungsten carbide hard seals applied by spraying on the valve seat surface |
Meets the international standard ANSI/FCI 70-2, which specifies a Class 6 absolute air tightness rating. |
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Import/Export Connection Type |
Flange connection (RF/RTJ grooved surface), butt weld connection (BW), socket weld connection (SW) |
The flange size specifications strictly comply with ASME B16.5/DIN EN 1092-1. |
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Nominal diameter size |
DN15 – DN300 (from 1/2 inch to 12 inches) |
The large-diameter full-bore design achieves an extremely low flow resistance coefficient (Cv value). |