The opening and closing part of the bellows seal globe valve is a plug-shaped disc, the sealing surface is flat or conical, and the disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type and a lifting rotating rod type. The bellows seal globe valve is only suitable for full opening and full closing, and adjustment and throttling are not allowed. This type of valve should generally be installed horizontally in the pipeline.

Bellows seal globe valve is a widely used valve. The reason for its popularity is that the friction between the sealing surfaces is small during the opening and closing process, it is relatively durable, the opening height is not large, it is easy to manufacture, and it is easy to maintain. It is not only suitable for medium and low pressure, but also suitable for high pressure.

Closure Principle of Bellows Seal Globe Valve

Bellows seal globe valve relies on the pressure of the valve rod to make the sealing surface of the disc and the sealing surface of the valve seat fit closely to prevent the flow of medium.

Precautions of Bellows Seal Globe Valve 

1. When the opening and closing of the bellows sealed globe valve cannot be directly operated by hand, a wrench can be used to open and close.

2. When the valve stem is opened and closed in place, no more force can be applied, otherwise the bellows sealed globe valve will easily cause the internal thread to break and cause damage to the valve.

3. When opening and closing the bellows seal globe valve, it is necessary to observe the sealing surface of the valve, especially the gland of the packing, to avoid leakage.