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Cryogenic valve for high-pressure applications in industrial systems.
High-Performance Cryogenic Ball Valve
Cryogenic valve for high-pressure applications in cryogenic systems.

High-Performance Cryogenic Valve Series

Qisheng’s High-Performance Cryogenic Valves are engineered for extreme cold environments, operating reliably at temperatures ranging from -50°C down to -196°C. This comprehensive series—including gate, globe, check, and ball valves—features advanced cryogenic engineering such as extended bonnets for thermal insulation, specialized drip plates to prevent icing, and upstream cavity relief for safety. All key components undergo liquid nitrogen treatment to ensure structural stability. Fully compliant with ISO 28921, BS 6364, and ISO 15848-1 low-emission standards, Qisheng cryogenic valves are the premier choice for LNG terminals, LPG plants, and ethylene processing .

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Description

Qisheng High-Performance Cryogenic Valve Series

In the world of extreme cold, reliability is the only option. The Qisheng Cryogenic Valve Series is purposefully designed to meet the rigorous demands of temperatures as low as -196°C. Our range includes gate, globe, check, and both floating and trunnion-mounted ball valves. From LNG terminals to ethylene plants, Qisheng valves utilize advanced thermal management, precision deep-freeze treatments, and low-emission sealing technology to ensure safe, leak-free operation in the most critical cryogenic processes [cite: 189, 197-200, 220].

Core Cryogenic Engineering

  • Deep Cryogenic Treatment: Key components are submerged in liquid nitrogen before final machining to improve the microstructure stability of austenitic stainless steel at low temperatures, preventing dimensional changes during service.
  • Extended Bonnet Design: Provides sufficient vaporization space for cryogenic media to maintain stem packing at a temperature high enough for safe operation [cite: 204-205]. The extension lengths comply with the widely accepted MESC SPE 77/200 standard[cite: 206].
  • Drip Plate Protection: An integrated drip plate prevents condensation water from dripping into the insulation layer, avoiding the risk of pipeline freezing and potential damage [cite: 208-209].
  • Cavity Pressure Relief: For valves with cavity structures (like gate and ball valves), a dedicated relief hole faces upstream to prevent excessive pressure buildup caused by trapped medium vaporization [cite: 210-211].
  • Advanced Stem Guide: Equipped with a shaft sleeve at the lower part of the stem to ensure perfect alignment and sealing, effectively preventing torque increases and stem scratching [cite: 212-213].

Superior Sealing & Manufacturing

  • Specialized Seat Design: Gate, globe, and check valves feature CoCr Alloy hardfacing for maximum durability[cite: 215]. Floating ball valves use spring-preloaded seats to compensate for low-temperature material contraction, while trunnion-mounted models utilize high-performance Lipseals for the body and stem [cite: 215-216].
  • Certified Low Emission Performance: All valves utilize low-emission gaskets and packing, with assembly torques strictly controlled to meet the fugitive emission requirements of ISO 15848-1 [cite: 218-220].
  • Clean-Room Assembly: Manufactured using high-quality castings and forgings with high-precision machining[cite: 202]. Final assembly is performed in a clean area to prevent dust particles from compromising valve performance[cite: 202].

Typical Applications & Industries

Qisheng’s cryogenic solutions are trusted across the global energy and gas infrastructure sectors:

  • LNG Infrastructure: Liquefaction plants, terminals, storage tanks, and LNG transport ships.
  • Petrochemical Plants: Ethylene plants and LPG processing facilities [cite: 198-199].
  • Industrial Gas: Low-temperature air separation and industrial gas storage plants[cite: 200].

Technical & Operating Specifications

We provide a full range of cryogenic valves tested in our in-house lab, which features full-size liquid nitrogen pools and helium detectors [cite: 221-222].

  • Design Standards: ISO 28921, BS 6364, MESC SPE 77/200 [cite: 192-195]
  • Design Temperature: -50°C to -196°C
  • Emission Certification: ISO 15848-1 [cite: 220]
  • Product Range & Sizes:
    • Gate Valves: NPS 2″ – 24″ | Class 150/300/600/900/1500 [cite: 224-225]
    • Globe Valves: NPS 2″ – 12″ | Class 150/300/600/900/1500 [cite: 226]
    • Check Valves: NPS 2″ – 24″ | Class 150/300/600/900/1500 [cite: 227]
    • Floating Ball Valves: NPS 1/2″ – 6″ (Class 150/300/600/900/1500) [cite: 228-231]
    • Trunnion Mounted Ball Valves: NPS 2″ – 24″ (Class 150/300/600/900/1500) [cite: 232-234]
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