Bellows Sealed Gate Valve

[Bellows Sealed Gate Valve]——A design that forms a metal barrier between the fluid medium and the atmosphere through automatic roll welding to ensure zero leakage of the valve stem. The bellows globe valve uses a bellows structure. The lower end of the stainless steel bellows is welded to the valve stem through a stainless steel gasket to prevent the process fluid from corroding the valve stem. The other end is placed between the valve body and the valve cover to form a static seal. Double seal design is adopted. If the bellows fails, the stem packing will avoid leakage. The bellows are welded to the stem to maintain stable operation performance, to avoid stem vibration caused by flap vibration. It is most suitable for pipelines with steam, flammable, explosive, thermal oil, high purity, toxic and other media.

1. Standard design of double-layer bellows;

2. Design of heat dissipation valve cover;

3. Design of oil storage device;

4. Design of nut for retaining valve stem by circlip;

5. Reasonable product structure, reliable sealing performance, beautiful appearance;

6. Surfacing Co-based hard alloy on the sealing surface, wear-resistant, corrosion-resistant,long service life;

7. Valve stem quenching and tempering and surface nitriding treatment have good anti-corrosion and anti-friction properties;

8. Valve stem lifting position indication is more intuitive;

9. The material of the parts, the size of the flange and the number of butt welding can be reasonably selected according to the actual working conditions or user requirements to meet various engineering needs.

The bellows gate valve is manufactured with advanced high-performance metal bellows + packing dual sealing technology, which eliminates the shortcomings of aging and leakage of the single packing of ordinary gate valves. It not only improves the efficiency of use, but also greatly increases the safety and reliability of use. Also reduces maintenance costs and frequency. The key component of the metal bellows, the lower end of the valve stem assembly is welded by seam welding technology, and the upper end is welded to the connecting plate to form a metal barrier between the fluid medium and the atmosphere to ensure zero leakage at the valve stem. The grease joint on the bonnet can directly lubricate the valve stem, nut and shaft sleeve.

The bellows gate valve products are widely used in: petrochemical industry, chemical fiber textile, power plant, steel mill, plastic papermaking, hot oil system, steam system, cold and hot water system and other industries and working conditions.

■Characteristics of bellows gate valve: double-layer bellows, convenient maintenance, double sealing, position indication

■Application of bellows gate valve: power station, natural gas, ammonia, vacuum, refrigeration system, hot oil system, hot water

Design and manufacturing standards: GB12234, API6D;

Structural length standard: GB1221, ANSI B16.10;

Flange standards: JB79, ANSI B16.5;

Inspection and test standards: GB12937, API 598