NIKONiko Bellows Gate Valve

Brand: Jiangsu NIKO Niko

Connection Type: Flange, Welding

Material: Ductile Iron, Cast Steel, Forged Steel, Stainless Steel.

Nominal Diameter: DN15-DN400

Nominal Pressure: PN16-40

Operating Temperature: -29～425℃

Product Description: NIKO Niko Bellows Gate Valve, through automatic roll welding, forms a metal barrier between the fluid medium and the atmosphere, ensuring a zero-leakage design at the valve stem. The internal structure of the bellows gate valve uses a bellows structure, with the lower end of the stainless steel bellows welded to the valve stem via a stainless steel gasket to prevent 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. The double sealing design ensures that if the bellows fail, the valve stem packing will still prevent leakage. The bellows are welded to the valve stem to maintain stable operating performance and avoid valve stem vibration caused by disc vibration. It is most suitable for pipelines carrying steam, flammable, explosive, thermal oil, high-purity, toxic, and other media.
NIKO Niko Bellows Gate Valve Structural Features: Standard double-layer bellows design, heat-dissipating valve cover design, lubricant storage device design, circlip-fixed valve stem nut design, reasonable product structure, reliable sealing performance, and aesthetically pleasing appearance, sealing surface overlaid with Co-based hard alloy, wear-resistant, corrosion-resistant, excellent anti-friction performance, and long service life, valve stem quenched and tempered with surface nitriding treatment, providing good corrosion and friction resistance, valve stem lifting position indicator for more intuitive operation, component materials, flange, and butt-weld dimensions can be reasonably selected based on actual working conditions or user requirements to meet various engineering needs. Bellows gate valve features: double-layer bellows, easy maintenance, double sealing, position indicator, manufactured using advanced high-performance metal bellows + packing double sealing technology, eliminating the drawback of aging and leakage in single sealing packing of ordinary gate valves, not only improving efficiency but also significantly enhancing safety and reliability, while reducing maintenance costs and frequency. The key component, the metal bellows, is welded at the lower end to the valve stem assembly using roll welding technology, and at the upper end to the connecting plate via roll welding, forming a metal barrier between the fluid medium and the atmosphere to ensure zero leakage at the valve stem. The grease fitting on the valve cover allows direct lubrication of the valve stem, nut, and bushing.
Applications: Petroleum, chemical, chemical fiber, power plants, steel plants, papermaking, thermal oil, steam, cold and hot water systems, and other industries and working conditions.