What are the advantages of globe valves?

Imported national standard globe valve (stop valve, globe valve) is also called cut-off door, using the national standard standard, its opening and closing parts are plug-shaped valve discs, sealing the top is a plane or sea cone surface, and the valve disc moves in a straight line along the center line of the valve seat to realize the opening and closing of the valve. The movement form of the valve stem, (common name: dark rod), there are also lifting and rotating rod types, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

The stem axis of the globe valve is perpendicular to the seat sealing face. The stem opening or closing stroke is relatively short.

Once the valve disc of the globe valve is in the open state, between its valve seat and the sealing surface of the valve disc, it is no longer in contact, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most of the globe valve are relatively easy to repair, and when the sealing element is replaced, there is no need to remove the entire valve from the pipeline, which is very suitable for the occasion that the valve and the pipeline are welded into one. These features make shut-off valves ideal for use as a shut-off or adjustment and throttling of media.

When the medium passes through such valves, the flow direction changes. Therefore, the flow resistance of the globe valve is higher than that of other valves.

According to the characteristics of the globe valve, the characteristics and advantages of the globe valve (according to the VTON globe valve as an example) are summarized.

Advantages: 1. In the process of opening and closing, the friction between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant.

2. The opening height is generally only 1 4 of the valve seat channel, so it is much smaller than the gate valve;

3. Usually there is only one sealing surface on the valve body and valve disc, so the manufacturing process is relatively good and easy to maintain.

4. Because its filler is generally a mixture of asbestos and graphite, the temperature resistance level is high. Generally, steam valves use globe valves.

5. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also be avoided;

6. External leakage, and in line with international sealing standards;

7. No fluid loss, reduce energy loss, and improve the safety of plant equipment;

8. Long service life, reduce the number of maintenance and reduce operating costs;

9. The sturdy and durable bellows sealing design ensures zero leakage of the valve stem and provides maintenance-free conditions.

10. The bellows seal globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the aging and easy leakage of the ordinary valve stem packing seal, which not only improves the energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment. For example, the imported bellows globe valve of Vton is a widely used globe valve, which is used by the majority of users in steam pipelines.

(1) The structure of the globe valve is simpler than that of the gate valve, and the manufacturing and maintenance are more convenient. (2) The sealing surface is not easy to wear and abrasion, the sealing is good, and there is no relative sliding between the valve disc and the sealing surface of the valve body when opening and closing, so the wear and abrasion are not serious, the sealing performance is good, and the service life is long. (3) When opening and closing, the stroke of the valve disc is small, so the height of the stop valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve.

4) The opening and closing torque is large, the opening and closing is more laborious, and the opening and closing time is the principal. (5) The fluid resistance is large, because the medium channel in the valve body is tortuous, the fluid resistance is large, and the power consumption is large. (6) When the nominal pressure PN 16MPa in the flow direction of the medium, the downstream flow is generally adopted, and the medium flows upwards from the bottom of the valve disc; When the nominal pressure is PN 20MPa, counterflow is generally adopted, and the medium flows down from above the disc to increase the seal energy.

When in use, the globe valve medium can only flow in one direction, and the flow direction cannot be changed. (7) When fully opened, the valve disc is often eroded. The stem axis of the globe valve is perpendicular to the seat sealing face.

The relatively short opening or closing stroke of the stem and the very reliable shut-off action make this valve suitable for use as a shut-off or adjustment and throttling of the medium.

The closing tightness of the globe valve is better than that of the gate valve, the valve body is long, the flow resistance is large, and the hazel is electromechanical.

The partition effect is good, and it is not easy to leak.

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Beacon valve professionals will answer for you, gate valve refers to the valve in which the shut-off (ram) moves in the vertical direction along the center line of the channel. Gate valves are mainly used for shut-off in pipelines. Gate valve is a kind of valve that is widely used, the shut-off device with a general diameter of DN 50mm is selected from it, and sometimes the shut-off device with a small diameter is also used as a gate valve, and the gate valve has the following advantages:

Low fluid resistance.

The external force required for opening and closing is small.

There is no restriction on the flow direction of the media.

When fully opened, the erosion of the sealing surface by the working medium is less than that of the shut-off valve.

The body shape is relatively simple, and the casting process is better.

Gate valves are used in relatively large systems to close the gate system; The globe valve is used in a relatively small system, and plays a role in regulating the flow of the system, can not close the specification stipulates that the gate valve and the globe valve are used on different occasions, the gate valve is divided into many kinds such as open rod gate valve, dark rod gate valve, wedge gate valve, single valve gate valve, multi-valve gate valve is the valve body structure is different, large volume. Generally, large and nominal caliber DN50 are mostly used for gate valves, especially in industrial high temperature and high pressure, highly toxic and other occasions.

The globe valve can intercept and adjust the flow rate, occupies a small area, is small in size, and is generally used in situations less than the nominal diameter DN50. Both can be turned off, and the flow can be adjusted in situations where the linearity of the flow is not high. It's just that the shut-off valve has a large flow resistance due to its structural characteristics, so the gate valve is used more where there is a requirement for throttling.

In addition, whether the globe valve is installed in the front or reverse, there is always a very laborious opening and closing process, so it cannot be made very large, or it is not easy to open and close. In addition, the globe valve has the characteristics of good one-way sealing effect, so it is also useful in the occasion of preventing the backflow of working fluids.

Hope it helps!

Uses of globe valves:

1. The main function of the globe valve in the pipeline is to cut off or connect the fluid, and the regulating flow of the globe valve is better than that of the gate valve, but the globe valve cannot be used to adjust the pressure and flow rate for a long time, otherwise, the sealing surface of the globe valve may be washed and corroded by the medium, destroying the sealing performance.

2. The globe valve can be used for water, steam, air shrinkage and other pipelines, but it should not be used for medium pipelines with high viscosity, easy coking and easy precipitation, so as not to damage the sealing surface.

Globe valve: A forced seal valve.

The globe valve and ball valve are good in the globe valve.

It is better to choose a globe valve for entry, because compared with the ball valve, the above has an advantage. And if there is a problem in the later stage, it will be more convenient to repair, because only the valve core needs to be replaced.

Working principle and characteristics of globe valve:

The valve plays an important role in cutting off and throttling the medium in the pipeline where it is located, and the globe valve is an extremely important cut-off valve, and its sealing is by applying torque to the valve stem, and the valve stem exerts pressure to the valve disc in the axial direction, so that the sealing surface of the valve disc and the sealing surface of the valve seat are tightly fitted, and the medium is prevented from leaking along the gap between the sealing surfaces.

Compared with the alarm valve, which is another kind of cut-off valve used in industrial production, the globe valve is simpler than the former in terms of knot and finch penetration, which is easy to manufacture and maintain. In terms of service life, the sealing surface of the globe valve is not easy to wear and abrasion, and there is no relative sliding between the valve disc and the seat sealing surface during the opening and closing of the valve or ridge door, so the wear and abrasion of the sealing surface is small, so the service life of the sealing pair is improved, and the valve disc stroke is small in the process of full closure, and its height is smaller than that of the alarm valve. <>