Bellows Gate Valve

The Bellows Gate Valve is a linear motion isolation valve that uses a flexible metal bellows as the core sealing component, combining the advantages of traditional gate valves with advanced sealing technology. Its opening and closing principle is consistent with standard gate valves: the valve disc moves linearly along the fluid centerline to realize on-off control of the pipeline medium. The key difference lies in the metal bellows assembly between the valve stem and valve cover, which forms a reliable metal barrier between the medium and the atmosphere, completely eliminating fugitive emissions and ensuring the safety of the operating environment and personnel safety.

Our Bellows Gate Valve is precision-engineered with strict quality control, covering a full range of specifications to meet the diverse needs of different industrial scenarios. Whether it is handling corrosive, flammable, explosive toxic media or high-temperature, high-pressure working conditions, it can maintain stable performance and long service life, becoming the preferred valve product for high-safety requirement projects worldwide.

1.Zero Leakage Sealing Performance : Adopting high-quality metal bellows (AISI 633/AM 350 or customized materials) with automatic roll welding technology, the bellows is welded to the valve stem at the lower end and fixed between the valve body and valve cover at the upper end, forming a complete static and dynamic sealing system. All bellows are 100% tested by helium gas, and the entire valve undergoes strict sealing tests to ensure zero leakage of the valve stem, fully complying with ISO 15848 and EPA environmental standards.

2.Double Safety Seal Design : Equipped with a dual sealing structure of "bellows + graphite packing", even if the bellows is accidentally damaged, the backup graphite packing can quickly play a sealing role, preventing medium leakage and avoiding safety accidents. This design greatly improves the reliability and safety of the valve in critical applications.

3.Long Service Life & Durability : The metal bellows adopts an extended, multi-wall and anti-torsion design, with an opening and closing life of up to 10,000 cycles, far exceeding the industry average. The valve disc and seat are hardfaced with CoCr alloy, which has excellent wear resistance, corrosion resistance and anti-friction performance. The valve body is made of high-strength materials such as cast steel, forged steel and stainless steel, which can withstand extreme working conditions and reduce maintenance frequency and cost.

4.Wide Temperature & Pressure Adaptability : Suitable for working temperatures ranging from -101℃ to 650℃ and pressure ranges from PN16 to PN260 (150LB to 1500LB), it can adapt to various harsh working environments such as cryogenic, high-temperature and high-pressure. It is especially suitable for LNG facilities, nuclear power plants and other special scenarios that require strict temperature and pressure control.

5.Self-Cleaning & Stable Operation : The valve disc adopts a conical design, which can automatically remove impurities on the sealing surface when closing, ensuring reliable sealing performance. The 360° free-rotating valve disc design can avoid vibration transmission to the valve stem, reduce noise and improve operation stability. For valves with DN>150, a triangular positioning device is added to protect internal components from vibration and enhance tensile strength.

6.Easy Installation & Maintenance : The valve is designed with standard connection methods (flange, butt welding, socket welding, thread), which is compatible with international pipeline standards and easy to install and replace. The overall structure is simple, and the wearing parts are easy to disassemble and maintain, reducing the downtime of the production line and improving production efficiency. We also provide maintenance manuals in 24 languages for global customers.

- Oil & Gas Industry : Oil exploration, refineries, natural gas pipelines, LNG facilities, used for on-off control of crude oil, natural gas and other media.

- Petrochemical & Chemical Industry : Chemical plants, fertilizer plants, used for handling corrosive media such as chlorine, hydrofluoric acid, phosgene, bisphenol A and isocyanates.

- Power Generation Industry : Thermal power plants, nuclear power plants, steam systems, used for controlling high-temperature and high-pressure steam and cooling water.

- Pharmaceutical Industry : Pharmaceutical production lines, used for handling high-purity media that require no pollution and zero leakage.

- Other Industries : Vacuum systems, refrigeration systems, hot oil systems, cold and hot water systems, textile and printing and dyeing industries, etc..

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