When do you need to use a reinforcing ring for a valve bellows assembly?

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Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of the user's stove.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are changing rapidly, and the rankings may vary by time and region. For the latest ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

The bellows is not used for sealing, but is mainly used to reduce the vibration of the pipeline flow and achieve a stable pipeline flow.

The stem part of the bellows valve adopts a double seal of bellows and packing, which is often used in occasions with strict requirements for stem sealing. The metal bellows can produce corresponding displacement under the action of pressure, transverse force or bending moment, and has the advantages of pressure resistance, corrosion resistance, temperature stability and long service life. The bellows can improve the sealing performance of the valve stem part and protect the valve stem from the corrosion of the medium, which is suitable for the heat station pipeline of the polyester chemical fiber industry, high vacuum and nuclear industry.

The inspection method of bellows valve is divided into three items: parts inspection, tightness inspection, and complete machine inspection.

Parts Inspection:

The inspection and test of bellows and bellows components are divided into factory inspection and type inspection, and the inspection conditions should be carried out under the conditions of ambient temperature of 5 40, humidity of 20% 80% and atmospheric pressure of 86 106kpa, unless otherwise specified.

The bellows with nonconforming items in the factory inspection is a nonconforming product. In the type test, the minimum value is taken to calculate the minimum cycle life. If the three test pieces are qualified, the type inspection of the product of this specification is judged to be qualified.

One of the three items is unqualified and allowed to be resampled once. Two of the three tests are unqualified, and the type inspection is judged to be unqualified. The test result is qualified if there is no visible leakage.

Leak inspection.

After the bellows assembly and valve stem combination are welded by argon arc welding method, the leakage test is carried out with 016MPa gas at standard atmospheric pressure and ambient temperature of 20, the test duration is 3min, and the result is that there is no visible leakage.

Whole machine inspection. Before assembly, remove all parts burrs, clean all parts and valve body cavity, and carry out the whole machine inspection and test after the assembly is completed, and the test results meet the requirements for the whole machine valve to be qualified, and surface grinding, cleaning, polishing, painting and packaging are allowed.

After continuous process improvement, process quality control and accurate inspection, the bellows valve has met the performance requirements of preventing the leakage of flammable and explosive media, radioactive media or precious media, and can maintain the high vacuum of the valve, so as to ensure that the factory pass rate of the product reaches 100%.

To put it simply, the bellows and the bonnet and stem are welded into one, there is no seam, so there is no leakage, and the action of the valve stem is caused by the deformation of the bellows by compression. Not by relative motion.

Are you asking about the bellows inside the valve?

Bellows Safety Valve: Bellows eliminate the effects of back pressure fluctuations on valve performance and protect springs and other internals from corrosive media. And it can effectively prevent the leakage of the medium.

Bellows globe valve: The packing of the bellows and the valve form a double seal to prevent the leakage of the medium, which is mostly used for toxic media.

Bellows trap: The bellows is made into a thermal element to control the valve drain and block air.

In the valve, the bellows are mainly used to prevent secondary leakage.

Rely on the expansion and bending of the bellows to compensate the pipeline in the axial, transverse and angular directions. Its role can be played in:

1.Compensate for the axial, transverse and angular thermal deformation of the absorption pipe.

2.Absorb equipment vibration and reduce the impact of equipment vibration on pipelines.

3.Absorb the deformation of the pipeline by subsidence.

4.Prevent secondary leakage.

bellows valve

Valves that use a bellows as a stem sealing element. It is often used in applications where stem sealing is critical, such as in high vacuum applications and in the nuclear industry.

The bellows can be used instead of the stuffing box on the ordinary valve or in combination with the stuffing box, so that there is no leakage in the valve stem to prevent the leakage of radioactive materials or valuable materials, or to maintain a high vacuum.

The bellows plays a role in absorbing the deformation of the valve body caused by the temperature of the gas on the blind valve. Recommended: Baishun brand bellows for blind valves, corrugated compensators for steel mills, non-metallic compensators, well-known brands in the Chinese market.

The bellows globe valve adopts a bellows structure inside, and the lower end of the stainless steel bellows is welded to the stem to prevent the process fluid from etching the stem. The other end is placed between the valve body and the bonnet to form a static seal.

The American standard bellows globe valve is suitable for cutting off or connecting the pipeline medium in the petroleum, chemical, pharmaceutical, fertilizer, power industry and other working conditions with nominal pressure and working temperature of -20 -350.

Main advantages of bellows globe valve products:

1.The bellows globe valve, its key component metal bellows, the lower end and the valve stem assembly are automatically rolled welded, and the upper end is automatically rolled welded with the connecting plate to form a metal barrier between the fluid medium and the atmosphere to ensure zero leakage of the valve stem;

2.The disc is tapered designed, and the sealing surface is streamlined with the medium, which has better sealing performance and longer service life;

3.Double sealing design (bellows + packing) If the bellows fails, the stem packing will also avoid leakage and meet international sealing standards;

4.The bonnet has its own grease fitting, which can directly lubricate the stem, nut and bushing, unlike the traditional thread only lubrication;

5.Ergonomically designed handwheel, longer service life, easy and convenient operation, more safe and reliable; Application: hot oil system, steam system, hot and cold water system, etc.

Bellows globe valve and ordinary globe valve are commonly used two types of globe valves, users often struggle with which one to choose on these two valves, it depends on the difference between the two, we understand according to the characteristics of the imported globe valve brand American Weidun VTON

The imported bellows globe valve, also known as the bellows double seal globe valve, is designed to form a metal barrier between the fluid medium and the atmosphere through automatic rolling welding to ensure zero leakage of the valve stem. General steam, toxic gas, high-temperature medium and other occasions with strict sealing requirements.

The inside of the imported bellows globe valve adopts a bellows structure, and the lower end of the stainless steel bellows is welded to the valve stem to prevent the process fluid from etching the valve stem. The other end is placed between the valve body and the bonnet to form a static seal. The double sealing design is adopted, if the bellows fails, the stem packing will also avoid leakage, and the bellows is welded to the stem to maintain stable running performance, so as to avoid the stem vibration caused by the vibration of the valve plug.

It is most suitable for steam, flammable, explosive, heat transfer oil, high-purity, toxic and other media pipelines. For example, the imported bellows globe valve of Vton is often designated as a brand for steam projects.

Summarize the difference between bellows globe valve and conventional globe valve.

1.The bellows globe valve is double sealed, no leakage, and it is safer to use in high-risk media.

2.Ordinary globe valves are sealed with packing, and the stem and packing slip and leak easily at low temperatures (spool).

3.The bellows globe valve replaces the packing seal with a closed bellows that can be stretched and compressed, which can effectively prevent external leakage caused by packing loss. It is generally used for the transportation of media with strong permeability, such as the valve on the hydrogen system, as long as the bellows is not damaged, there is generally no leakage; However, the general shut-off valve is sealed with packing material, which is prone to leakage.

4.The opening or closing stroke of the stem is relatively short, and it has a very reliable shut-off function, and because the change of the seat port is proportional to the stroke of the disc, it is very suitable for regulating the flow rate. Therefore, this type of valve is ideal for use as a shut-off or regulation as well as throttling.

Compared with conventional globe valves, imported bellows globe valves have many advantages in addition to the more expensive cost

1. The bellows stop valve has no leakage, and it is relatively safe to use in high-risk media.

2. The ordinary globe valve is sealed with packing, and the valve stem and packing will slide, which is easy to leak at low temperature (valve core).

3. The bellows globe valve replaces the packing seal with a closed bellows that can be stretched and compressed, which can effectively prevent the external leakage caused by packing loss. It is generally used for the transportation of media with strong permeability, such as the valve on the hydrogen system, as long as the bellows is not damaged, there is generally no leakage; However, the general shut-off valve is sealed with packing material, which is prone to leakage.

4. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also avoid leakage and meet international sealing standards.

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

The bellows globe valve, also known as the bellows seal globe valve, is designed to form a metal barrier between the fluid medium and the atmosphere through automatic roll welding to ensure zero leakage of the valve stem. Compared with traditional globe valves, it has the following advantages:

1. The bellows globe valve imported by Vton has a long service life, reduces the number of maintenance and reduces operating costs. The rugged bellows seal design guarantees zero leakage of the stem and provides maintenance-free conditions.

2. The opening and closing torque of the valve is small, which reduces the 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, which is a high-quality energy-saving product.

4. The outer seal of the valve adopts bellows seal and graphite and stainless steel gasket seal, which is reliable and can be used for a long time without replacing the sealing packing. In industrial use, the leakage caused by the shut-off valve: high temperature, highly toxic, flammable and explosive, radioactive media, etc., not only pollutes the environment, but also often causes significant personal and property losses.

This kind of valve is much safer and more stable, and the design and manufacture of foreign advanced standards are strictly adopted.

Bellows valves can be used on negative pressure systems, while ordinary globe valves will leak.

The design and manufacture of bellows valves and acceptance standards are designed and manufactured according to GB T12224, DIN3202, DIN3239.

Inspection and testing according to API598, JB T9092, DIN3230.

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