Ultra-low temperature ball valves are suitable for very low and low temperature applications. The valve features an integrated bonnet extension structure that prevents cryogenic liquids from reaching the stem packing by boiling and converting the liquid into gas. This allows energy to be lost in the extension and protects the valve from failure. The structural integrity of the valve minimizes any thermal distortion of internal components caused by temperature changes, ensuring the highest level of tight shut-off performance in the critical LNG sector.
Compact structure, beautiful shape and small flow resistance coefficient.
Long service life.
Make sure that the propeller shaft is not damaged.
Light weight and good sealing performance.
The main function of the ultra-low temperature valve is to cut off or connect the fluid channel in the pipeline, and apply a certain rotation distance at the upper end of the valve stem with the help of a handle or other driving device and transmit it to the ball, so that the through hole of the ball coincides with the center line of the valve body channel or is perpendicular to complete the opening and closing action.
A ball valve has 7 essential parts that make up its structure:
- Body and cover (3): These are the pressure retaining parts, being the container for the internal parts of the valves. The body is where all the parts are assembled.
- Ball (4): It is the element located in the flow passage that allows (or prevents) the flow inside the line, through a 90º turn on an axis perpendicular to the flow direction.
- Stem (1): This is the element that actuates the ball, and can be manually or automatically operated (electrically or pneumatically).
- Handle: This is the lever that allows the ball to be operated through the stem.
- Seats (5): These components, made of different materials, are positioned to hold the ball between the sealing surfaces of the seat itself, thus allowing the fluid to be hermetically sealed.
- Body seals: These are the elements that prevent fluid leakage to the outside between the body and the valve cover. They can be made of various materials.
- Valve stem seals (2): Valve stem seals are the sealing elements that are placed between the valve body and the valve stem to prevent leakage of fluid to the outside. They can be made of different materials.
| Parts |
Main parts material |
| Material(150UTBXK) |
Material(150UTBXKM) |
| Ball |
304SS |
316SS |
| Gland packing |
PTFE |
PTFE |
| Lever handle |
Ductile cast iron |
Ductile cast iron |
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