What is the difference between a globe valve and a bellows valve?

The difference and comparison between bellows globe valve and ordinary 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 traditional globe valves, it has the following advantages:

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1. The bellows globe valve has a long service life, reduces the number of maintenance and lowers operating costs. The sturdy and durable bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.
2. The valve opening and closing torque is small, reducing 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 streamline, and the flow resistance coefficient of the valve is reduced. It 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 the sealing packing does not need to be replaced for long-term use. In industrial use, the leakage caused by the stop valve: high temperature, highly toxic, flammable and explosive, radiant medium, etc., not only pollute the environment, but also often cause significant personal and property losses. However, this type of valve is much safer and more stable, and strictly adopts foreign advanced standards in design and manufacturing.

Advantages and application of bellows globe valve The bellows globe valve has no leakage, and it is safer to be used in high-risk media. Ordinary globe valve is sealed with packing, the valve stem and packing will slide, and it is easy to leak at low temperature (spool).
The bellows cut-off 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 transmission of highly permeable media, such as valves on hydrogen systems, as long as the bellows is not damaged, there is generally no leakage; while the general shut-off valve is sealed with packing, which is prone to leakage.
The opening or closing stroke of the valve stem of this kind of valve is relatively short, and it has a very reliable cut-off function. Also, because the change of the valve seat port 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 use as a shut-off or adjustment and throttling.

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Suggested reading:
API 6A or ASME Sec8 Div2 2
Why is Floating Ball Valve supplier Better?
BS EN 13709 Lift Check Valve, EN 10213 1.0619, DN50, ...

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Related news /knowledge:

bellow seal valve has a compact structure and is one kind of control valve to balance the pressure. Bellows are used as the valve stem sealing components of the bellow seal valves.

To avoid the leakage of the valve stem, the valve adopts the structure with bellows instead of stuffing boxes generally used for the ordinary valve or the structure with both bellows and stuffing boxes. 

The bellow seal valve is particularly suitable for pipelines of steam and flammable, explosive and hazardous media. Moreover, because of bellow's properties of deformation and aging resistance, the bellow seal valve overcomes the common latent defects, including temperature sensitivity and the aging of the stuffing box, and these defects are owned by the

A bellow seal globe valve is operated as an obstruction between fluids and the air. At the same time, the valve can prevent fluids leaking to the air and guarantee zero leakage of pipelines. 

The bottom of bellows is welded to the valve stem of the

With the double seal structure, the bellow seal globe valve can avoid leakage due to the packing of valve stem even if bellows are broken. The structure that bellows is welded to the valve stem guarantees stable working performance and can avoid the vibration of the valve stem caused by the vibration of the valve plug.

In general, the bellow seal globe valve is damaged due to the mechanical squeeze instead of the operation during manufacturing. The globe valve has bellows with various coatings and different grades of elasticity. However, all these bellow seal globe valves have similar wear and tear, which can not be seen from outside and resulted from the adhesion of particles and the surface corrosion owing to media inside the valve. Thus, in daily practice, bellows are required to be replaced before their operation lives end.

Characteristics of bellow seal globe valves
No loss of fluids, better security of the factory's equipment
Long operating life with less maintenance and fewer operating costs
Durable sealing structures without leakage

Differences between ordinary globe valves and bellow seal globe valves
The bellow seal globe valve has superior sealing performance and is more efficient to guarantee the security of pipelines with hazardous media than the ordinary

The original globe valve is sealed by packing and has the valve stem not in tight contact with packing, causing high leak rates under low temperatures.

Instead of the packing, bellows with good tension and compression properties can be used for the bellow seal globe valve to ensure good sealing performance. 

The bellow globe valve, in general, is used for pipelines of permeable media such as ammonia since the pipeline will leak only if bellows of the bellow seal globe valve are broken. At the same time, however, the ordinary globe valve sealed by packing shows worse sealing performance.

has a compact structure and is one kind of control valve to balance the pressure. Bellows are used as the valve stem sealing components of the bellow seal valves.To avoid the leakage of the valve stem, the valve adopts the structure with bellows instead of stuffing boxes generally used for the ordinary valve or the structure with both bellows and stuffing boxes.Theis particularly suitable for pipelines of steam and flammable, explosive and hazardous media. Moreover, because of bellow's properties of deformation and aging resistance, the bellow seal valve overcomes the common latent defects, including temperature sensitivity and the aging of the stuffing box, and these defects are owned by the valve sealed by packing.is operated as an obstruction between fluids and the air. At the same time, the valve can prevent fluids leaking to the air and guarantee zero leakage of pipelines.The bottom of bellows is welded to the valve stem of the bellow seal globe valve to avoid process fluids eroding the valve stem. At the same time, the other side of bellows forms static seal between the valve body and the bonnet.With the double seal structure, thecan avoid leakage due to the packing of valve stem even if bellows are broken. The structure that bellows is welded to the valve stem guarantees stable working performance and can avoid the vibration of the valve stem caused by the vibration of the valve plug.In general, theis damaged due to the mechanical squeeze instead of the operation during manufacturing. The globe valve has bellows with various coatings and different grades of elasticity. However, all these bellow seal globe valves have similar wear and tear, which can not be seen from outside and resulted from the adhesion of particles and the surface corrosion owing to media inside the valve. Thus, in daily practice, bellows are required to be replaced before their operation lives end.No loss of fluids, better security of the factory's equipmentLong operating life with less maintenance and fewer operating costsDurable sealing structures without leakageThe bellow seal globe valve has superior sealing performance and is more efficient to guarantee the security of pipelines with hazardous media than the ordinary globe valve does.The originalis sealed by packing and has the valve stem not in tight contact with packing, causing high leak rates under low temperatures.Instead of the packing, bellows with good tension and compression properties can be used for theto ensure good sealing performance.The bellow globe valve, in general, is used for pipelines of permeable media such as ammonia since the pipeline will leak only if bellows of theare broken. At the same time, however, thesealed by packing shows worse sealing performance.

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