The bellows seal gate valve adopts a bellows seal structure inside, and the lower end of the stainless steel bellows is welded on the valve stem to prevent the process fluid from eroding the valve stem. The other end is welded between the valve body and the bonnet to form a static seal. A double sealing design is adopted. If the bellows fail, the valve rod packing will also avoid leakage. The bellows welded to the valve rod will maintain stable operation performance and avoid the valve rod vibration caused by the valve plug vibration. It is suitable for pipelines with steam, flammable, explosive, heat transfer oil, high purity, toxic and other media. It completely eliminates the defects of quick aging and easy leakage of ordinary valve stem packing, not only improves the energy efficiency, but also increases the safety of production equipment, and reduces the maintenance cost and frequent maintenance. It also provides a clean and safe working environment.

Technical specification

Design & manufacturing standard as per ASME B16.34 EN ISO 12516
Face-to-face standard as per ASME B16.5 EN558

Fanged ends standard as per ASME B16.5/ASME B 16.25/ASME B 16.11/ASME B 1.20.1
Testing & inspection standard as per API598/BS EN 12266(BS6755)

Product Range

Body material: Carbon steel, Stainless steel, Alloy steel ,Monel, Duplex, Inconel,etc
Size range(s):1/2″～14″
End Connection: RF, RTJ,BW, NPT,SW
Pressure rating: Class150 – Class900
Working temperature: -29℃ – +350℃
Operation: handlewheel, worm gear, electric, etc

Design Features

Double sealing design (bellows + packing) if the bellows fails, the stem packing will also be avoided.

Prevent leakage and comply with international sealing standards.

No fluid loss reduces energy loss and improves plant equipment safety.

Long service life reduces maintenance times and reduces operating costs.

The rugged bellows seal design provides zero leakage of the valve stem for maintenance-free conditions.