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Bellows Seal Valve Construction Design 2011-11-10

The Bellows Seal Valve cartridge is welded to both the valve bonnet and the valve stem. The Bellows Seal Valve cartridge has a number of convolutions and these convolutions become compressed or expanded depending upon the movement of valve stem. (Scientifically speaking the Bellows Seal Valve gets compressed when the valve is in the open position and expanded when the valve is in the closed condition). It is important to properly install the valve bodies. The Bellows Seal Valve can be sealed to the valves in two different ways. Firstly, the Bellows Seal Valve can be welded to the valve stem at the top and the valve body on the bottom. In this case the process fluid is contained inside the Bellows Seal Valve or in second method the Bellows Seal Valve is welded to the valve stem at the bottom and the body on the top. In this case the process fluid is contained in the annular region between the valve bonnet and Bellows Seal Valve (from the outside).

The Bellows Seal Valve is a critical component and forms the heart of the Bellows Seal Valve seal valves. To avoid any twisting of the Bellows Seal Valve the valve must have a stem with linear movement only. This can be achieved using a so-called sleeve-nut at the yoke portion of the valve bonnet. A handwheel is fitted onto the sleeve-nut which effectively transfers a rotary motion of the handwheel into a linear motion in the valve stem.

Bellows Seal Valve Features:

1. The product has reasonable structure, reliable seal, doule durable matal seal design to assure no leakage and safer factory facility.

2. The seal surface is buildup welding with Co hard alloy. It has characteristics of good abrasion resistance, good corrison resisitance, god anti-scuffing roperties and long life.

3. The stem has good abrasion resistance and good corrosion resistance. It is treated by heat and nitriding.

4. Stem shows the lifting position visually.

5. The part material, flange and butt weld and dimension may be selected according to current operating condition and users' requirement, so that meeting the requrements of various engineering.

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