What is the difference between ordinary globe valve and bellows globe valve

What is the difference between ordinary globe valve and bellows globe valve?The bellows globe valve is also called the bellows seal globe valve. Through automatic seam welding, a metal barrier is formed between the fluid medium and the atmosphere to ensure the design of zero leakage of the valve stem. Compared with ordinary globe valves, bellows globe valves have the following advantages:

1. The bellows globe valve has a long service life, reduces maintenance times and reduces operating costs. Robust and durable bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.

2. The opening and closing torque of the valve is small, which reduces labor intensity, and can drive any form of driving device, which is convenient for remote control.

3. The appearance is beautiful, the valve channel has a smooth flow line, which reduces the flow resistance coefficient of the valve, and is a high-quality energy-saving product.
4. The outer seal of the valve adopts bellows seal and graphite, stainless steel gasket seal, the seal is reliable, and there is no need to replace the seal packing for long-term use. In industrial use, the leakage caused by the globe valve: high temperature, highly toxic, flammable and explosive, radioactive media, etc., not only pollute the environment, but also often cause significant personal and property losses. This type of valve is much safer and more stable, and advanced foreign standards are strictly adopted in design and manufacture.

Advantages and applications of bellows globe valve

The bellows globe valve has no leakage, and it is safer to be used in high-risk media.

Ordinary globe valves are sealed with packing, and there will be sliding between the stem and the packing, which is easy to leak (spool) at low temperatures.

The bellows stop valve uses a closed bellows that can be stretched and compressed to replace the packing seal, which can effectively prevent external leakage caused by packing loss. It is generally used for the transportation of medium with strong permeability, such as the valve on the hydrogen system, as long as the bellows is not damaged, there is generally no leakage; while the general stop valve is sealed with packing, which is prone to leakage.

The opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for cut-off or regulation and throttling.
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