Overview of Small Bellows Valves
Bellows valves need to use a small (valve size about Φ2mm) medium and low-pressure valve with hydrogen embrittlement resistance, corrosion resistance and radiation resistance in hydrogen and hydrogen isotope treatment system. It is required that the valve has good internal and external sealing performance, helium leakage rate < 1×10-9Pa m3/s, and service life of the valve > 100 times. After long-term storage in a hydrogen and hydrogen isotope environment, the valve should have high working reliability. Because the hydrogen treatment system requires high purity of hydrogen, it is impossible to use ordinary packing valves, especially when dealing with hydrogen isotopes, no leakage of the valves is allowed. Therefore, a small bellows valve with no leakage points outside was designed as a valve for the hydrogen system.
Types and materials of small bellows valves:
According to the user requirements, the small bellows valve adopts the model of the globe valve. The globe valve can be opened to full flow quickly under the condition of short stroke and has the advantages of lighter weight, smaller volume, flexible operation and convenient use than other valves (such as gate valves or butterfly valves). As the working medium of the valve is hydrogen, it causes hydrogen damage or hydrogen embrittlement to some materials, which leads to material failure and leakage. Therefore, the valve is made of metal material with hydrogen corrosion resistance and high mechanical strength and hardness, which can meet the requirements of sealing reliability and corrosion resistance after long-term use.
Working principle of small bellows valves:
Small bellows valves use bellows as sealing elements of valve stems. One end of the bellows is welded and fixed on the valve cover and valve seat, and the other end is welded on the valve stem. The valve stem moves up and down to drive the bellows to compress or stretch. The bellows play the role of valve stem sealing and an elastic element. When the valve is closed, the valve stem moves downwards, and the disc moves downwards to press the cover tightly so that the valve can be closed. When opening the valve, lift the valve stem, and the disc leave from the sealing surface, then the valve opens to complete the opening action. Axial stroke of bellows is controlled by a mechanical limit of valve stem movement.
Types and materials of small bellows valves:
According to the user requirements, the small bellows valve adopts the model of the globe valve. The globe valve can be opened to full flow quickly under the condition of short stroke and has the advantages of lighter weight, smaller volume, flexible operation and convenient use than other valves (such as gate valves or butterfly valves). As the working medium of the valve is hydrogen, it causes hydrogen damage or hydrogen embrittlement to some materials, which leads to material failure and leakage. Therefore, the valve is made of metal material with hydrogen corrosion resistance and high mechanical strength and hardness, which can meet the requirements of sealing reliability and corrosion resistance after long-term use.
Working principle of small bellows valves:
Small bellows valves use bellows as sealing elements of valve stems. One end of the bellows is welded and fixed on the valve cover and valve seat, and the other end is welded on the valve stem. The valve stem moves up and down to drive the bellows to compress or stretch. The bellows play the role of valve stem sealing and an elastic element. When the valve is closed, the valve stem moves downwards, and the disc moves downwards to press the cover tightly so that the valve can be closed. When opening the valve, lift the valve stem, and the disc leave from the sealing surface, then the valve opens to complete the opening action. Axial stroke of bellows is controlled by a mechanical limit of valve stem movement.
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