The bellows stop valve is also called the bellows seal stop valve. Through automatic seam welding, a metal barrier is formed between the fluid medium and the atmosphere to ensure zero leakage of the valve stem. Compared with the traditional globe valve, it has the following advantages:
1. U.S. Shield VTON imported bellows cut-off valve has long service life, reducing maintenance times and reducing operating costs. The rugged bellows seal design ensures zero leakage of the stem and provides maintenance-free conditions.
2. The valve has small opening and closing torque, reduces labor intensity, and can drive any type of driving device for remote control.
3, beautiful appearance, valve channel has a smooth flow line, reducing the flow resistance coefficient of the valve, is a high-quality energy-saving products.
4. The outer seal of the valve is sealed with bellows and sealed with graphite and stainless steel gaskets. The seal is reliable. It can be replaced without long-term use. In industrial use, the leakage caused by the shut-off valve: high temperature, highly toxic, flammable and explosive, radiation medium, etc., not only pollute the environment, but also often cause significant personal and property losses. This type of valve is safe and stable, and strictly adopts foreign advanced standards in design and manufacture.
Stainless steel is suitable as a material for the production of bellows globe valves
The material suitable for the production of the American Vault VTON imported bellows stop valve must have good plasticity, high elastic limit, tensile strength and fatigue strength, good welding performance and stable elastic performance. Austenitic stainless steels are widely used in the manufacture of bellows due to these performance characteristics. High pressure and pressure resistance are the basic requirements for valves and bellows. However, as the pressure level of the valve increases, the wall thickness of the bellows increases and the rigidity increases, which increases the difficulty of valve opening and bellows manufacturing. Corrugated pipe manufacturers generally do not simply increase the wall thickness, but increase the layer's resistance to pressure by increasing the number of layers, while reducing the axial stiffness of the bellows and reducing the valve opening force.
Corrosion-resistant non-metallic materials have excellent corrosion resistance, and fluoroplastic anti-corrosion valves are widely used. PTFE corrugated pipe shut-off valves also have certain application fields. However, due to the low strength and heat resistance of non-metallic materials, the general use temperature does not exceed 150 ° C, and the application range is limited. Austenitic stainless steels represented by 304 and 316L can cope with the less corrosive conditions, but it is necessary to use corrosion-resistant alloys with excellent corrosion resistance when dealing with wet chlorine corrosion such as chlor-alkali industry and other harsh corrosive conditions. material.
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