The high-pressure shut-off valve is mainly used in industries that have high requirements for pressure. The conventional connection method is welding and threading. The high-pressure shut-off valve is mainly used in the chemical and pharmaceutical fields. Since it’s welded, it’s not convenient for replacement. It’s mainly suitable for occasions where the repair is not very frequent and the wear ratio is relatively low.

Sanitary shut-off valve is a kind of valve whose closing member (valve flap) moves along the centerline of the valve seat. According to this type of movement of the valve flap, the change in the opening of the valve seat is proportional to the stroke of the valve flap. Because the opening and closing stroke of the valve stem of this type of valve is relatively short and the shut-off function is very reliable, and because the change in the opening of the valve seat is proportional to the stroke of valve flap, which is very suitable for the regulation of the flow, this type of valve is very suitable for shut-off, regulation, and throttling.

The most prominent advantages of shut-off valve are:

1. During the process of opening and closing, as the friction between the valve flap and the sealing surface of the valve body is smaller than that of the gate valve, it’s very wearable.

2. The opening height is usually only one-fourth of the diameter of the valve seat passage, which is much smaller than that of the gate valve.

3. Usually there’s only one sealing surface on the valve body and valve flap, so the manufacturing technique is good and it’s easy to repair.

Meanwhile, the disadvantages of shut-off valves can’t be ignored. Its main disadvantage is the big flow resistance coefficient, which causes pressure loss. And in hydraulic devices, this kind of pressure loss is particularly obvious.

Conclusion

Thank you for reading our article and we hope it can help you better understand the advantages of ultra high-pressure shut-off valves. If you want to learn more about ultra high-pressure shut-off valves, we would like to advise you to visit Adamant Valve homepage for more information.

The post The Advantages of Ultra High Pressure Shut-off Valves appeared first on Adamant Valves.

5. Forged steel sanitary shut-off valve

The forged steel globe valve is designed and manufactured in accordance with the API 602 Standard and provides three types of bonnet design: bolt bonnet welded bonnet and pressure self-sealing bonnet. Users can choose different forms according to their needs like the connections of RF flange, NPT thread, and SW welding.

6. Oxygen sanitary shut-off valve

This valve is made of good quality brass or stainless steel casting, with high mechanical strength, wear resistance, good safety, and so on. It is used in the oxygen pipeline, with the best explosion-proof flame-retardant properties, eliminating the insecurity of the oxygen pipeline. It is widely used in steel, metallurgy, petrochemical, chemical, and other oxygen project pipe network, in addition to the function of a common cut-off valve, but also has its own characteristics. It uses a strict prohibition of oil in manufacturing. In addition, all parts are strictly degreased before installation.

7. Corrugated sanitary shut-off valve

It uses the shape of stainless steel bellows design, reciprocating bellows test 10000 times without failure. Moreover, its sealing performance is reliable which is suitable for industrial and mining flammable and explosive and toxic, and harmful media. It can effectively prevent valve leakage.

8. Lining fluorine sanitary shut-off valve

It is suitable for various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, and various organic acids, strong acids, and strong oxidants from minus 50 degrees Celsius to 150 degrees Celsius. It can also be used in a variety of concentrations of strong alkali organic solvents and other corrosive gas or liquid media on the pipeline.

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A vacuum valve refers to the vacuum system components used to change airflow direction, adjust the airflow, cut off, or connect a pipeline in a vacuum system. It refers to valves with working pressure below standard atmospheric pressure. Vacuum valve components are sealed with a rubber sealing ring or metal sealing ring to maintain the dependable vacuum-seal closure that they’re named for.

Advantages of Vacuum Shut-off Valve

What is the Purpose of a Shut Off Valve?

A vacuum sanitary shut-off valve is mainly used in pipelines to shut off, distribute, and change the flow direction of the fluid medium. They can also be used to protect the vacuum system in power failure situations.

What is a Vacuum Shut-off Valve?

The vacuum shut-off valve is a relatively new type of gate valve. It has some unique advantages inherent in its structure, such as durable sealing and low-torque, frictionless opening and closing. This can reduce the total pressure on the associated actuator. Using a multi-turn electric actuator can help achieve efficient regulation and shut-off for most fluid processing systems. It’s widely used in petroleum, chemical, urban water supply, drainage, and other working conditions that require consistently dependable shut-off performance. This type of valve is usually installed horizontally.

What are the Advantages of Vacuum Shut-off Valves?

Vacuum shut-off valves are essential components of numerous fluid processing systems. These specialized valves offer the following advantages:

1. Low Fluid Resistance

Its resistance coefficient is equal to that of the pipe segment of the same length.

2. Efficient Performance

The lightweight and compact size make it a convenient fit on most fluid process systems and, therefore, easy to install.

3. Tighter Sealing

Currently, plastics are used for most gate valve sealing surfaces, which provide sufficient sealing for vacuum applications.

4. Easy Operation

It only takes a rotation of 90 degrees to switch from the fully open state to the fully closed state, making it the fastest and most convenient option whether you use manual control or remote control.

5. Easy to Repair

The gate valve has a simple structure with a sealing ring that usually remains activated, making it convenient to disassemble and replace when necessary.

6. Erosion-Free Performance

Fluid cannot erode the sealing surface as it passes through the valve. When it’s fully open or fully closed, the gate body’s sealing surface and valve seat are isolated from the fluid medium. This helps extend the longevity of the entire valve and ensures consistent sealing over its lifetime.

7. Wide Range of Application

A vacuum shutoff valve can be made with a diameter as small as a few millimeters or as large as a few meters. It can be applied to fluid systems with diverse demands, from high vacuum to high pressure. Plus, its reliable performance makes it perfect for emergency shutoff use.

Conclusion

Vacuum shutoff valves have become essential gate valves in various fluid process systems thanks to their dependable vacuum sealing. They offer several advantages that make them beneficial in many highly specialized applications. 

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A sanitary shut-off valve is a kind of mandatory sealed valve. When the valve is closed, pressure must be applied to the valve gate to ensure the sealing surface doesn’t leak. When the medium enters the valve from below the valve gate, the resistance the operating force needs to overcome is the friction between the valve stem and stuffing as well as the propulsion produced by the pressure of the medium. The force used to close the valve is bigger than the force used to open the valve, so the diameter of the valve needs to be big, otherwise, the valve stem will be bent.

What are the types of sanitary shut-off valve connection methods?

There’re three types of connection methods: flange connection, threaded connection, welded connection. Since the appearance of self-sealing valves, the flow direction of the medium of shut-off valves is changed to entering from above the valve gate. In this case, under the pressure of the medium, the force used to close the valve is small while the force used to open the valve is big, so the diameter of the valve stem can be reduced accordingly. Meanwhile, under the influence of the medium, this type of valve is also more compact.

The opening and closing member of the shut-off valve is a plug-shaped sanitary valve gate. Its sealing surface is flat or sea-coned. The valve gate shuttles along the centerline of the valve seat. The movement of the valve stem includes up-and-down rotating rod type, used for controlling the flow of various fluids like air, water, steam, corrosive media, mud, oil, liquid metal, and radioactive media. Thus, this type of shut-off valve is very suitable for cutting off or regulating or throttling. This type of valve is very suitable for regulating the flow because the opening and closing distance of the valve stem is relatively short and has very reliable cutting-off functions and because the change in the valve seat is proportional to the distance of the valve gate.

Sanitary Shut-off Valve Applications

1. Needle sanitary shut-off valve

A needle sanitary shut-off valve is a small gauge globe valve that opens and closes and precisely controls flow in the instrumentation piping system. They are mainly power station instrumentation series, oilfield series, and American standard series.

2. The low-temperature sanitary shut-off valve

Low-temperature globe valves are usually globe valves with operating temperatures below -110 ° C and are widely used in LNG, liquefied petroleum gas, and other cryogenic industries. From 2008 it can be made for the temperature of -196 ℃ cut-off valve, all parts of liquid nitrogen pretreatment at low temperature, completely avoid the use of seal deformation leaks.

3. Plunger sanitary shut-off valve

The sealing surface of a plunger sanitary shut-off valve is a radial seal structure. This valve has two elastic sealing rings that wrap over the polished plunger. The valve body and bonnet connection bolts apply a load on the bonnet, compressing the elastomeric seal around the plunger to seal.

4. Insulation sanitary pinch valve

The design of an insulation sanitary pinch valve uses an external heat source in the outside of the globe valve cycle heating, effectively prevent the media through the shut-off valve temperature loss, to ensure the temperature of the medium.

5. Forged steel sanitary shut-off valve

The forged steel globe valve is designed and manufactured in accordance with the API 602 Standard and provides three types of bonnet design: bolt bonnet welded bonnet and pressure self-sealing bonnet. Users can choose different forms according to their needs like the connections of RF flange, NPT thread, and SW welding.

6. Oxygen sanitary shut-off valve

This valve is made of good quality brass or stainless steel casting, with high mechanical strength, wear resistance, good safety, and so on. It is used in the oxygen pipeline, with the best explosion-proof flame-retardant properties, eliminating the insecurity of the oxygen pipeline. It is widely used in steel, metallurgy, petrochemical, chemical, and other oxygen project pipe network, in addition to the function of a common cut-off valve, but also has its own characteristics. It uses a strict prohibition of oil in manufacturing. In addition, all parts are strictly degreased before installation.

7. The corrugated sanitary shut-off valve

It uses the shape of stainless steel bellows design, reciprocating bellows test 10000 times without failure. Moreover, its sealing performance is reliable which is suitable for industrial and mining flammable and explosive and toxic and harmful media. It can effectively prevent valve leakage.

8. Lining fluorine sanitary shut-off valve

It is suitable for various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, and various organic acids, strong acids, and strong oxidants at minus 50 degrees Celsius to 150 degrees Celsius. It can also be used in a variety of concentrations of strong alkali organic solvents and other corrosive gas or liquid media on the pipeline.

The post What Are the Applications of Sanitary Shut-off Valve? appeared first on Adamant Valves.

Due to the special movement mechanism of this type of structure, it has adverse consequences on the upper sealing pair of the sanitary shut-off valve (there’s the vertical pressure required for the sealing pair, and there’s the relative sliding friction between sealing pairs).

The practice has proved that after several times of opening and closing of the upper sealing of the shut-off valve, leakage will be caused due to scratches between sealing pairs. Valves with slight scratches will need to be disassembled and repaired.

Valves with severe scratches will have to be abandoned due to serious damage. Such results not only increase the manufacturing cost of companies but also affect the performance of the valve. In order to solve these kinds of problems, the structure and materials of the upper sealing of the shut-off valve are tested and improved.

1. Move the upper sealing part of the valve stem onto the valve flap.

The purpose is to make the upper sealing surface on the valve flap to be in a static state without slipping relative to the upper sealing surface of the valve cover.

Although such an improvement can improve the service life of the upper sealing, it’s not cost-effective because of the fact that there needs to be a sealing between the valve flap cover and the valve flap.

2. Change the materials of the upper sealing pair.

Solder the sealing cone surface of the valve stem with Stellite hard alloy that has a good anti-scratch performance. This method has achieved good results. However, on the one hand, because the cost of Stellite hard alloy is too high, and on the other hand, because the material of the valve stem is martensitic stainless steel, the solderability is poor. There needs to be a pre-heating before soldering.

The temperature-keeping and welding techniques after soldering are complex. In addition, to ensure the dimensional precision of the valve stem, the rough-processing procedure needs to be added.

The post The Improvement on Sealing Structure of Shut-off Valve appeared first on Adamant Valves.

The movement of the valve stem includes lifting rod type (the valve stem lifts while the hand wheel doesn’t lift) and lifting rotating rod type (the hand wheel and the valve stem rotate and lift together, the nut is located on the valve body). Bellows shut-off valve is only suitable for being fully open and fully closed and is not allowed to regulate and throttle.

The liquefied gas shut-off valve is a mandatorily sealed valve, so when the valve is closed, pressure must be applied to the valve flap to ensure there’s no leakage in the sealing surface. When the medium enters the valve from below the valve flap, the resistance the operating force needs to overcome is the friction between the valve stem and stuffing and the thrust produced by the pressure of the medium.

The force used to close the valve is larger than the force used to open the valve, so the diameter of the valve stem needs to be large, otherwise, valve stem bending failure will occur. In recent years, since the appearance of the self-sealing valve, the flow direction of the medium of sanitary shut-off valve is into the valve chamber from above the valve flap.

Under the effect of the pressure of the medium, the force used to close the valve is small and the force used to open the valve is large, so the diameter of the valve stem can be reduced accordingly. Meanwhile, under the effect of the medium, this type of valve is also tight.

Liquefied gas shut-off valve has the following advantages:

1. Simple structure, which makes the manufacture and repair very convenient.
2. Small working distance, short opening and closing time.
3. Good sealing, small friction between sealing surfaces, and long service life.

Liquefied gas shut-off valve has the following disadvantages:

1. Large fluid resistance. The force needed to open and close it is large.
2. Not suitable for the medium that has particles, a large degree of viscosity, and is easily coked.
3. Poor regulating performance.

According to the position of the valve stem thread, the type of liquefied gas shut-off valve can be divided into external thread type and internal thread type. According to the flow direction of the medium, it can be divided into straight-through type, direct flow type, and angle type. According to the sealing form, it can be divided into a stuffing sealing shut-off valve and bellows sealing shut-off valve.

The post Brief Introduction of Liquefied Gas Shut-off Valve appeared first on Adamant Valves.

Due to the special movement mechanism of this structure, it will cause extremely unfavorable consequences to the upper sealing pair of the valve (the formation of mandatory vertical pressure between sealing pairs and the friction of relative sliding between sealing pairs).

The practice has shown that after only a few times opening and closing, the upper sealing of the valve will have leakage due to the scratches between sealing pairs. Slight scratches require disassembly and repair, serious scratches result in damage and scrapping.

Such a result not only increases the cost of manufacturing for companies but also affects the performance of valves. In order to solve this kind of problem, tests and improvements are made to the structure and materials of the upper sealing of the valve.

1. Move the upper sealing part of the valve stem onto the valve flap (the purpose is to make the upper sealing surface of the valve flap be in a static and non-slip state relative to the upper sealing surface of the valve cover during the process of being under impact).

Although such an improvement can improve the service life of upper sealing, it is not cost-effective due to the fact that there needs to be another piece of sealing between the valve flap cover and the valve flap, complicating the structure.

2. Change the upper sealing pair materials. Solder Stellite hard alloy that has a good anti-scratch performance on the sealing cone of the valve stem.

This method has achieved good results. However, on the one hand, the cost of Stellite hard alloy is too high, on the other hand, the basic materials of the valve stem are 13Cr martensitic stainless steel, which has poor solderability.

There needs to be a pre-heating before soldering, and the insulation and welding technique after soldering is complicated. In addition, in order to ensure dimensional precision, a rough processing procedure needs to be added. Overall, except for special requirements, this method is also not cost-effective.

The practice has shown that improving the valve stem cone hardness is a feasible option to improve the service life of the upper sealing of sanitary shut-off valve.

The post Introduction of Upper Sealing Structure of Shut-off Valve appeared first on Adamant Valves.

Because it’s easy to repair the valve seat and valve flap of most shut-off valves and there’s no need to disassemble the whole valve from the pipeline when we replace sealing components, it’s suitable for occasions where the valve and the pipeline are welded. When the medium passes through this kind of valve, the flow direction of it changes, so the flow resistance of the shut-off valve is relatively higher than that of other valves.

Commonly used shut-off valves are the following:

1. Angle type shut-off valve

In angle type shut-off valve, the fluid only needs to change the direction once, so that the pressure drop through the valve is smaller than that of the shut-off valve of conventional structure.

2. Direct flow type shut-off valve

Indirect flow type or Y-type shut-off valve, the flow channel of the valve body, and the main flow channel form an oblique line. The destruction degree of this type of flow is smaller than that of the conventional shut-off valve, so the pressure loss of the valve is accordingly smaller.

3. Plunger type shut-off valve

This type of shut-off valve is a variant of a conventional shut-off valve. In this type of valve, the valve flap and valve seat are usually designed based on the plunger mechanism. The valve flap is polished into a plunger and connected with the valve stem. The sealing is achieved by two elastic sealing rings mounted on the plunger. The two elastic sealing rings are separated by a collar. The sealing rings around the plunger are pressed tight by the load applied to the valve cover by the valve cover nut. Elastic sealing rings can be replaced and can be made from a variety of materials. The valve is mainly used for “on” or “off”, but with a specially designed plunger or collar, it can also be used for flow regulation.

The post The Flow Resistance of Shut-off Valve appeared first on Adamant Valves.

1. The structure of the shut-off valve is simpler than that of the gate valve. It’s easy to manufacture and repair.

2. The sealing surface of the shut-off valve is not easy for wear and abrasion. The sealing performance is good. There is no relative sliding between the valve flap and the sealing surface of the valve body when sanitary shut-off valve is opened or closed so that neither the wear nor the abrasion is serious.

The sealing performance is good. The service life is long. The area of the sealing surface is small, and the structure is relatively simple. The required hours for manufacturing the sealing surface and the expensive materials required for the sealing ring are both less than those of the gate valve.

3. When the shut-off valve is opened or closed, the stroke of the valve flap is small, so the height of the shut-off valve is lower than that of the gate valve, but its structural length of it is longer than that of the gate valve.

4. The opening and closing torque of the shut-off valve is large, so it takes some effort to open and close the valve, and it takes some time to open and close the valve.

5. The fluid resistance of the shut-off valve is large, due to the fact that the medium channel inside the valve body is winding. The bigger the fluid resistance, the more the momentum is consumed.

6. Shut-off valve is not suitable for a medium that has particles, large viscosity, and is easy to coke.

7. The regulating performance of the shut-off valve is relatively poor.

8. When the nominal pressure PN is equal to or less than 16MPa, downstream is commonly used, with the medium moving upwards from below the valve flap. When the nominal pressure PN is equal to or larger than 20MPa, countercurrent is commonly used, with the medium moving downwards from above the valve flap to increase the sealing performance. When in use, the medium of the shut-off valve can only move in a single direction, the flow direction of it can’t be changed.

9. When the shut-off valve is fully open, the valve flap is often affected by erosion.
10. Shut-off valve uses screw thread to move the valve flap, so it is unlikely that the valve will suddenly open or close, which makes the “water hammer” phenomenon less likely to occur.

The shut-off valve is suitable for transmitting liquid and gas medium under various pressure and temperature conditions, but it is not suitable for transmitting liquid that contains solid precipitation or precipitation of liquid crystals.

The shut-off valve is well suited for shut-off, regulation, and throttling. And it can be used in most medium systems. various Shut-off valves have been researched and developed to meet the needs of petrochemical, power, metallurgy, urban construction, chemical, and other sectors.

The post What are the Uses of Shut-off Valve? appeared first on Adamant Valves.

When the medium enters the valve from below the valve gate, the resistance the operating force needs to overcome is the friction between the valve stem and stuffing as well as the propulsion produced by the pressure of the medium. The force used to close the valve is bigger than the force used to open the valve, so the diameter of the valve needs to be big, otherwise, the valve stem will be bent.

There’re three types of connection methods: flange connection, threaded connection, and welded connection. Since the appearance of self-sealing valves, the flow direction of the medium of shut-off valves is changed to entering from above the valve gate.

In this case, under the pressure of the medium, the force used to close the valve is small while the force used to open the valve is big, so the diameter of the valve stem can be reduced accordingly. Meanwhile, under the influence of the medium, this type of valve is also more compact.

The opening and closing member of the shut-off valve is a plug-shaped sanitary valve gate. Its sealing surface is flat or sea-coned. The valve gate shuttles along the centerline of the valve seat. The movement of the valve stem includes an up-and-down rotating rod type, used for controlling the flow of various fluids like air, water, steam, corrosive media, mud, oil, liquid metal, and radioactive media.

Thus, this type of shut-off valve is very suitable for cutting off or regulating, or throttling.

This type of valve is very suitable for regulating the flow because the opening and closing distance of the valve stem is relatively short and has very reliable cutting-off functions and because the change in the valve seat is proportional to the distance of the valve gate.

The post What is a Shut-off Valve? appeared first on Adamant Valves.