In environments reaching -196°C (Liquid Nitrogen) or -253°C (Liquid Hydrogen), standard materials become brittle. We utilize advanced Austenitic Stainless Steels (304L, 316L) and specialized polymers like PCTFE to ensure structural integrity and bubble-tight sealing where others fail.
Our cryogenic valves feature extended stem designs to keep the packing gland away from the ultra-cold medium. This prevents ice formation and ensures the manual or pneumatic actuator remains functional in extreme external conditions.
Through rigorous Helium Mass Spectrometer Leak Detection and hydrostatic testing, we guarantee compliance with API 6D and BS 6364 standards, minimizing boil-off gas (BOG) losses and ensuring maximum safety.
As the world moves toward decarbonization, the demand for Liquid Hydrogen valves is skyrocketing. Our R&D team is focusing on Vacuum Jacketed (VJ) valves that reduce heat transfer, essential for the H2 economy's efficiency.
Integration of IoT sensors for real-time monitoring of valve health and leakage is the new industry standard. We provide optional smart positioners and acoustic leak detection interfaces for large-scale LNG terminals.
Global EPC contractors now prioritize E-E-A-T compliant manufacturers who can provide full traceability, MTRs (Material Test Reports), and localized after-sales support.浙江 Maria Valve Co., Ltd. fills this gap with comprehensive documentation and certification.
Since its establishment, Zhejiang Maria Valve Co., Ltd. has specialized in manufacturing a wide range of industrial valves, serving key sectors such as petroleum, steel, power generation, chemical, and water treatment. Leveraging years of experience and advanced engineering technology, we have consistently delivered high-quality, reliable valves to clients worldwide.
We provide a comprehensive range of valves, including control valves, ball valves, butterfly valves, gate valves, and custom-designed specialty valves. As one of the pioneers in China’s valve manufacturing industry since 2003, we focus on combining cutting-edge technology with practical engineering solutions to ensure efficiency, safety, and long-term reliability.
Pipe Production
Injection Molding
Precision Cutting
Advanced Forging
CNC Machining
Launch of the 3rd generation Liquid Hydrogen valves with ultra-low thermal conductivity seals for aerospace refueling stations.
Deployment of "Digital Twin" valve models allowing plant operators to predict seal wear based on thermal cycle data.
Cryogenic valves are specifically engineered to handle fluids at temperatures below -150°C. Key differences include the use of extended bonnets for thermal insulation, specialized metallurgy (like SS304L) to prevent low-temperature embrittlement, and specific cleaning processes to remove hydrocarbons that could freeze or ignite.
The extended bonnet serves two purposes: it protects the stem packing from freezing by providing a gas column that insulates the gland from the liquid, and it ensures that the actuator or handle remains at a temperature where it can be safely operated by personnel or machinery.
We perform 100% helium leakage testing on all cryogenic seats and shells. Our valves are designed for "Bubble Tight" shutoff, complying with leakage Class VI for control valves and zero-leakage standards for ball and gate valves.
Yes, we offer compact-design valves and high-reliability triple eccentric butterfly valves specifically optimized for the space constraints and vibration requirements of offshore FLNG and FSRU units.
Maria Valve
