A Cryogenic Check Valve is a one‑way valve specially designed for cryogenic working conditions. It is widely used in liquefied natural gas (LNG), liquid nitrogen, air separation equipment, cryogenic storage tanks and distribution systems to ensure one‑way fluid flow, prevent medium backflow, and guarantee the safety and stability of the system.

Design Features

Compliant with design standards ASME B16.34, BS1868, BS 6364;

Low‑emission design;

Double‑sided Stellite hard‑faced sealing surfaces to guarantee reliability under cryogenic conditions;

Soft‑seat design, PTFE / PCTFE adopted for disc or seat sealing surfaces.

Classification

By structure, cryogenic check valves are divided into three types: steel cryogenic lift check valve, steel cryogenic swing check valve and steel cryogenic butterfly check valve.

Steel cryogenic lift check valves include vertical type and horizontal type.

Steel cryogenic swing check valves are available in single‑disc, double‑disc and multi‑disc configurations.

Working Principle

1. Swing‑type Working Principle

Cryogenic swing check valve features a disc rotating around the rocker shaft inside valve cavity. It operates automatically by fluid pressure and disc self‑weight.

Steel cryogenic swing check valve consists of valve body, bonnet, disc and rocker. Its disc is disc‑shaped and rotates around the pin shaft outside seat passage. The internal flow passage is streamlined with lower flow resistance than straight‑through lift check valves.

All opening‑closing components are contained inside valve body without penetrating through body wall, so there is no external leakage point. Spherical joint is applied between rocker and disc, providing 360‑degree freedom and proper micro‑position compensation for the disc.

2. Lift‑type Working Principle

Cryogenic lift check valve has its disc sliding along the vertical centerline of valve body. Steel cryogenic lift check valve shall only be installed on horizontal pipelines.

Its structure is similar to globe valve with identical body and disc. Guide sleeves are machined on upper part of disc and lower part of bonnet, so disc guide sleeve can move freely inside bonnet guide sleeve.

When medium flows forward, the disc opens under medium thrust. When medium flow stops, the disc falls onto seat by its own weight to prevent backflow.

Parts Material Table

Technical Parameters