The advantages and disadvantages of the globe valve
When the valve of the stop valve is in the open state, the contact between the valve seat and the sealing surface of the valve no longer comes into contact with it, and it has a very reliable cutting action. This valve is very suitable for the cutting or adjusting of the medium and the section. Streaming use.
Once the shutoff valve is in the open state, there is no more contact between its seat and the sealing surface of the disc, so its mechanical seal wear is less, because most of the seat and disc of the cutoff valve are easier to repair or replace. It is not necessary to remove the entire valve from the pipeline when sealing the components, which is suitable for the welding of valves and pipelines. The direction of flow of medium through such valves has changed, so the flow resistance of the shut-off valve is higher than other valves.
Commonly used stop valves are the following:
1) Angle-type shut-off valve; In the angle-type shut-off valve, the fluid only needs to change the direction once, so that the pressure drop through this valve is smaller than that of the conventional structure.
2) DC type stop valve; In the direct or Y type globe valve, the flow channel of the valve body is in a diagonal line with the main flow channel, so the damage degree of the flow state is smaller than the conventional stop valve, so the pressure loss through the valve is also corresponding. It's small.
3) Globe valve: This type of globe valve is a variant of a conventional globe valve. In this valve, the flap and seat are usually designed based on the plunger principle. The valve flap is ground to connect the plunger to the valve stem, and the seal is achieved by two elastic seals that are placed on the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is secured by the load applied by the bonnet nut to the valve cap. Elastic seals can be replaced and can be made from a wide variety of materials. The valve is mainly used for "open" or "closed", but it is available with a special plunger or special collar, which can also be used to regulate the flow .
Globe valves have the following advantages:
1, simple structure, manufacturing and maintenance more convenient.
2, the work schedule is small, opening and closing time is short.
3, good sealing, low friction between the sealing surface, long life.
4. The valve body has a straight-through, direct-flow, and right-angled structure. Straight through is the most common structure, but its fluid resistance is greatest. The DC type fluid has small resistance, and it is mostly used for fluids containing solid particles or with high viscosity. The right-angle valve body is mostly forged and is suitable for smaller pass-by valves and higher pressure shut-off valves.
The disadvantages of the globe valve are as follows:
1. The fluid resistance is large, and the force required when opening and closing is large.
2, does not apply to particles, viscosity, easy to coke the medium.
3, poor regulation performance.
4. The type of globe valve is divided into male thread type and female thread type according to the position of the stem thread. According to the flow direction of the media, there are straight-through, direct-flow, and angled. The shut-off valve is divided according to the form of the seal. There are packing seal cut-off valve and bellows sealed shut-off valve.
5. Bellows sealed globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the quick and easy leakage of common valve stem packing seals. It not only improves the use of energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent Maintenance, but also provides a clean and safe working environment.
Once the shutoff valve is in the open state, there is no more contact between its seat and the sealing surface of the disc, so its mechanical seal wear is less, because most of the seat and disc of the cutoff valve are easier to repair or replace. It is not necessary to remove the entire valve from the pipeline when sealing the components, which is suitable for the welding of valves and pipelines. The direction of flow of medium through such valves has changed, so the flow resistance of the shut-off valve is higher than other valves.
Commonly used stop valves are the following:
1) Angle-type shut-off valve; In the angle-type shut-off valve, the fluid only needs to change the direction once, so that the pressure drop through this valve is smaller than that of the conventional structure.
2) DC type stop valve; In the direct or Y type globe valve, the flow channel of the valve body is in a diagonal line with the main flow channel, so the damage degree of the flow state is smaller than the conventional stop valve, so the pressure loss through the valve is also corresponding. It's small.
3) Globe valve: This type of globe valve is a variant of a conventional globe valve. In this valve, the flap and seat are usually designed based on the plunger principle. The valve flap is ground to connect the plunger to the valve stem, and the seal is achieved by two elastic seals that are placed on the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is secured by the load applied by the bonnet nut to the valve cap. Elastic seals can be replaced and can be made from a wide variety of materials. The valve is mainly used for "open" or "closed", but it is available with a special plunger or special collar, which can also be used to regulate the flow .
Globe valves have the following advantages:
1, simple structure, manufacturing and maintenance more convenient.
2, the work schedule is small, opening and closing time is short.
3, good sealing, low friction between the sealing surface, long life.
4. The valve body has a straight-through, direct-flow, and right-angled structure. Straight through is the most common structure, but its fluid resistance is greatest. The DC type fluid has small resistance, and it is mostly used for fluids containing solid particles or with high viscosity. The right-angle valve body is mostly forged and is suitable for smaller pass-by valves and higher pressure shut-off valves.
The disadvantages of the globe valve are as follows:
1. The fluid resistance is large, and the force required when opening and closing is large.
2, does not apply to particles, viscosity, easy to coke the medium.
3, poor regulation performance.
4. The type of globe valve is divided into male thread type and female thread type according to the position of the stem thread. According to the flow direction of the media, there are straight-through, direct-flow, and angled. The shut-off valve is divided according to the form of the seal. There are packing seal cut-off valve and bellows sealed shut-off valve.
5. Bellows sealed globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the quick and easy leakage of common valve stem packing seals. It not only improves the use of energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent Maintenance, but also provides a clean and safe working environment.
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