• HEVC cryogenic gate valves with extended bonnets
  • HEVC cryogenic gate valves with extended bonnets

Cryogenic Gate Valves

HEVC cryogenic gate valves combine an extended bonnet, guided stem and hardfaced sealing surfaces for dependable isolation in LNG, LPG, air-separation and ethylene systems. Live-loaded packing and pressure-rise protection support reliable operation through low-temperature service cycles.
Technical Specifications Product Scope
Size DN15–DN600 / NPS 1/2–24
Pressure Class Class 150–1500
Temperature −196°C to +120°C
Standards BS 6364; GB/T 24925
Operation Manual / electric
Ends Flanged / welded
Body Materials Low-temperature carbon steel / low-temperature alloy steel / stainless steel
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  • HEVC cryogenic gate valves with extended bonnets

Description

Design & Construction

  • Extended bonnet and guided stem

    The extended bonnet separates the packing from the cold zone. A guide sleeve at the bonnet base supports stem alignment and stiffness.

  • Sealing and packing

    Cobalt-alloy hardfacing on the primary seat and backseat resists wear. A live-loaded gland maintains packing compression.

  • Pressure-rise protection

    The gate-valve arrangement incorporates protection against abnormal pressure rise from trapped cryogenic liquid.

  • Cryogenic preparation

    Major components receive deep-cold treatment and degreasing. A drip plate helps keep condensate out of the insulation.

Typical Duty / Applications

  • LNG and LPG isolation

    On/off isolation in low-temperature process and transfer piping.

  • Air separation

    Shutoff duty in cryogenic air-separation systems.

  • Ethylene service

    Isolation of low-temperature ethylene process lines.

Related Cryogenic Valves

Cryogenic Ball Valves · Cryogenic Gate Valves · Cryogenic Globe Valves · Cryogenic Control Valves

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