What kind of valve is the eccentric hemispherical valve? Is there any benefit to using it?

The eccentric hemispherical valve produced by our company is a relatively new type of ball valve, which has some advantages unique to its own structure, such as frictionless switch, seal not easy to wear, and small opening and closing torque. This reduces the size of the actuator. Equipped with a multi-turn electric actuator, it can realize the adjustment and strict cutting of the medium.

It has the following advantages:

1. The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length.

2. Simple structure, small size and light weight.

3. Tight and reliable, the sealing surface material of the ball valve is widely made of plastic, with good sealing, and has been widely used in vacuum systems.

4. Easy to operate, fast opening and closing, from full open to full closed, only need to rotate 90°, which is convenient for long-distance control.

5. Easy maintenance, simple structure of ball valve, sealing ring is generally movable, and it is more convenient to disassemble and replace.

6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the erosion of the sealing surface of the valve will not be caused when the medium passes.

7. Wide range of application, from small to a few millimeters in diameter, from high vacuum to high pressure. When the ball rotates 90 degrees, the sphere should be fully present at the inlet and exit, thus cutting off the flow.

The eccentric hemispherical valve is suitable for sewage treatment, pulp, alumina, and urban heating and heating to be strictly standardized;

It is suitable for the control of power plants, hydraulic slag removal or gaseous conveying pipelines.

The structural principle of the eccentric ball valve is almost the same as the three eccentric butterfly valves, the eccentric hemispherical valve uses the eccentric valve body, the eccentric sphere and the valve seat, and the valve stem is automatically centered in the common trajectory when the valve stem is rotated, and the closing process is tighter and tighter, so as to achieve the purpose of good sealing. The ball and seat of the valve are completely separated, which eliminates the wear of the sealing ring, overcomes the problem of constant wear of the traditional ball seat and the sealing surface of the ball, and the non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected. It is especially suitable for steel industry, aluminum industry, fiber, micro solid particles, pulp, coal ash, petroleum gas and other media.

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 users.

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 evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The eccentric hemispherical valve is actually a ball valve, which belongs to the same type of valve as the flanged gate valve.

The element of the switch realized by the ball valve is a sphere, and the middle passes through a cylindrical hole transversely, and the opening and closing is realized by rotating the sphere.

Reference encyclopedia.

The eccentric hemispherical valve, also known as the cam flex valve, is working on the principle of an eccentric rotating fan-shaped ball valve, which uses the eccentric ball crown to be tangent to the valve seat, and when opened, the ball core is separated from the valve seat; When closed, the ball core gradually touches the seat, causing the ball to exert a compressive force on the seat. Its features 1Spherical compression valve seat, easy to destroy crystalline stuttering, suitable for crystallization, stuttering and unclean media occasions.

2.The flow path is simple, the kv value is large, and the self-cleaning performance is good. 3.

Small size and light weight. 4.Suitable for two-person control.

It has an adjustment function, and it is quick and light to open, and the wear is self-compensating, and the scale can be broken by itself. It is suitable for conveying two or more media with precipitation, scaling, crystallization and precipitation, and many impurities.

The V-type ball valve is a fixed ball valve, which is also a single seat sealed ball valve, with the best adjustment performance among ball valves, the flow characteristics are equal percentage, and the adjustable ratio is up to 100:1. It has a shearing effect between the V-cut and the metal seat, which is especially suitable for media containing fibers, fine solid particles, slurries, etc.

It is suitable for frequent operation, rapid opening and closing, lightweight, low fluid resistance, simple structure, small relative volume, light weight, easy maintenance, good sealing performance, not limited by the installation direction, the flow direction of the medium can be arbitrary, no vibration, and low noise.

For eccentric rotary valves and V-shaped ball valves, I personally think that eccentric rotary valves are durable and V-shaped ball valves have good adjustability. Fujian Biaoguang Valve specializes in the production of eccentric ball valves and V-type ball valves.

The V-sphere is a fluid that needs to have a flow regulation effect and the medium is a medium with impurity particles. The hemisphere does not have a flow regulation function and can also be used in fluid conditions with impurity particles.

V-ball valves and eccentric hemispherical valves are both common types of valves, and their structures and working principles are different, so their application scenarios are also different.

The V-shaped ball valve is a kind of valve with a ball structure, and there is a V-groove on the ball, and when the ball rotates, the V-groove is docked with the V-groove of the valve seat, so as to realize the cut-off of the fluid. This kind of valve has the advantages of small flow resistance and good sealing, and is suitable for the control and shut-off of high temperature, high pressure and strong corrosive media.

The eccentric hemispherical valve is a kind of ball valve with eccentric structure, half of the ball is round, the other half is oval, and when the ball rotates, the oval part is in contact with the valve seat, so as to realize the cut-off of the fluid. This valve has the advantages of large flow rate and small opening and closing torque, and is suitable for flow control and shut-off.

In short, both are different in structure and application scenarios. It is necessary to select the appropriate valve according to the actual use requirements.

If you have a V-shaped ball valve, you can take a look. The structure of our company.

Haidun Flanged V-Ball Valve.

Haidun Clamp V-type ball valve.

Eccentric hemispherical valve is a kind of valve, and flange gate valve of the same type, eccentric hemispherical valve has a simple structure, light weight, as a new type of valve, in recent years it has been widely used, mostly used in petrochemical and other industries, with the rapid development of society, the current domestic production of eccentric hemispherical valve manufacturers will surely come more and more, today I want to introduce to you is a few manufacturers of eccentric hemispherical valves.

Eccentric hemispherical valve manufacturer one: Zhejiang Guocheng valve

The main products of Guocheng valve are: all-welded ball valve, one-piece all-welded ball valve, buried all-welded ball valve, loose welded ball valve, extended rod welded ball valve, directly buried welded ball valve, full-bore welded ball valve, flange all-welded ball valve, threaded all-welded ball valve, forged steel all-welded ball valve, eccentric hemispherical valve, floating ball valve, fixed ball valve, hard-sealed ball valve, high-pressure forged steel ball valve, high-temperature ball valve, stainless steel ball valve, and a series of products.

Eccentric hemispherical valve manufacturer two: Zhejiang Chengda special valve

Zhejiang Chengda Special Valve is located in Oubei Town, Wenzhou City, the hometown of China's pump valves, is a professional manufacturer with more than 20 years of valve production history, mainly producing wear-resistant ball valves, hard seal ball valves, eccentric hemispherical valves, ash discharge valves, silica fume valves, coal chemical special valves, fixed fireproof ball valves, national standard soft seal floating ball valves, American standard, Japanese standard soft seal floating ball valves, high-pressure butt welding ball valves, three-piece ball valves, wide ball valves, air source ball valves, hard seal butterfly valves, needle valves and other valves.

Eccentric hemispherical valve manufacturer three: Zhejiang Huatlong valve

Over the years, the company has been adhering to the road of combining traditional products and new product development, and is committed to implementing the "Hualong" brand strategy. It has successively developed a series of high-tech products such as hard seal insulation ball valves, forged ball valves, high-pressure forged steel ball valves, three-way ball valves, eccentric hemispherical ball valves, V-shaped ball valves, all-welded buried ball valves, and coal injection pulverized ball valves.

The above is the introduction of the manufacturer information about the eccentric hemispherical valve, I hope to help the friends who want to understand or buy the eccentric hemispherical valve, we should not only focus on a manufacturer when purchasing, we should do the shopping around, in order to be able to choose the best manufacturer in the comparison, and also to choose the most satisfactory eccentric hemispherical valve. The operation method of the eccentric hemispherical valve is simple and the sealing is good, and it is believed that the eccentric hemispherical valve will develop better and better in the near future.

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Eccentricity is deviation from the center line, in the case of butterfly valves:

1.The single eccentric butterfly valve is to solve the problem of extrusion of the butterfly plate and the valve seat of the butterfly valve, and the valve stem and the shaft deviate from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the rotary axis, disperse, and reduce the excessive extrusion of the upper and lower ends of the butterfly plate and the valve seat.

2.Double eccentricity is an elastic hard seal, which is further improved on the basis of single eccentricity, characterized by deviation from the center of the butterfly plate and the center of the body in the axis of the valve stem, so that after the valve is opened, the butterfly plate can quickly get out of the valve seat, which greatly eliminates the unnecessary excessive extrusion and scraping of the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves the life. Some manufacturers of double eccentric butterfly valves do not have the sealing technology in place, and the valve plate is easy to close.

3.Three eccentricity is to resist high temperature must use hard seal, but there is leakage, to zero leakage must be used soft seal, but soft seal is not high temperature resistance, in order to overcome the contradiction of double eccentric butterfly valve, and the butterfly valve for the third eccentricity, that is, the shape of the sealing pair is not a positive cone, but an oblique cone, the more the valve closes, the tighter it is, it is a multi-level structure, the pressure resistance is relatively high, and the high temperature resistance.

1.The biggest difference between eccentric hemispherical valve and other ball valves is that it adopts a triple eccentric design structure.

The mounting center of the ball plate is designed with a strict eccentricity from the center of rotation. When the valve is open 10 or even fully open, the valve seat sealing surface of the eccentric hemispherical valve is in a non-contact state with the ball plate, and when it is closed, the ball plate rotates with the valve stem and deflects into the valve seat sealing surface to make it sealed. Therefore, the service life of the valve is prolonged due to less and no wear in the opening and closing process.

2.The seat of the eccentric hemispherical valve is combined into a seal by an embedded O-ring rubber ring or fluoroplastic gasket. Therefore, it has the function of self-compensation for temperature difference and wear, etc., to ensure that the eccentric hemispherical valve is tightly sealed.

3.When the fluid pressure of the eccentric hemispherical valve pipeline is transmitted into the valve seat sealing groove, due to the principle of force component, the resultant force generated by the sealing part and the O-ring expansion force when the pipeline pressure is applied will squeeze the valve seat sealing surface to the ball plate. This unique sealing structure creates a greater sealing force as the line pressure increases.

4.The seat of this eccentric hemispherical valve can be fine-tuned. After a certain period of service life of the eccentric hemispherical valve, when the sealing ring wears out and leaks, the sealing pressure ring can be fine-tuned to the required size by the adjusting screw in the direction of the ball plate without disassembling the valve, which can be compensated and have the same sealing performance as the new valve.

5.In the fully open position, the thickness of the ball plate is the only resistance to the flow of the medium through the valve body, so the pressure drop generated through the valve is very small, so it has good flow control characteristics. There are two types of sealing types for eccentric hemispherical valves: elastic seal and metal seal.

Elastomeric seal valves, the sealing ring can be embedded in the valve body or attached to the perimeter of the ball plate.

Eccentric hemispherical valve and flange gate valve are the same type of valves, the difference is that its closing part is a ball, and the ball rotates around the center line of the valve body to achieve opening and closing.

The working principle of the eccentric hemispherical valve: it relies on rotating the valve chain to make the valve unblocked or occluded. The ball valve switch is lightweight, small in size, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, the sealing surface and the spherical surface are often in a closed state, not easy to be eroded by the medium, and have been widely used in various industries.

a. Opening process.

1. In the closed position, the ball is pressed on the valve seat by the mechanical pressure of the valve stem.

2. When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane disengages the ball from the valve seat.

3. The stem continues to lift and interacts with the guide pin in the spiral groove of the stem so that the ball begins to rotate frictionlessly.

4. Until it reaches the fully open position, the valve stem is lifted to the limit position, and the ball rotates to the fully open position.

b. Closing process.

1 When closing, rotate the handwheel clockwise, the stem begins to descend and makes the ball leave the seat and start rotating.

2. Continue to rotate the handwheel, and the valve stem is affected by the guide pin embedded in the spiral groove on it, so that the valve stem and the ball rotate 90° at the same time.

3 When it was about to close, the ball had been rotated 90° without contact with the valve seat.

4. In the last few turns of the handwheel, the angular plane at the bottom of the stem is mechanically wedged to compress the ball so that it is tightly pressed against the valve seat to achieve a complete seal.