What are the advantages of orbital ball valves and what are the disadvantages of ball valves

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.

Ball valve disadvantages:

1) Because the most important seat sealing ring material of ball valve is PTFE, it is inert to almost all chemical substances, and has the comprehensive characteristics of small friction coefficient, stable performance, not easy aging, wide temperature application range and excellent sealing performance.

However, the physical properties of PTFE, including a high coefficient of expansion, susceptibility to cold flow, and poor thermal conductivity, require that seat seals be designed around these properties. So, when the sealing material hardens, the reliability of the seal is compromised.

Also, PTFE has a low temperature resistance rating and can only be used in cases less than 180. Beyond this temperature, the sealing material will deteriorate. In the case of long-term use, it will generally only be used under 120.

2) Its regulation performance is worse than that of globe valves, especially pneumatic valves (or electric valves).

Advantages of ball valves: 1) It has the lowest flow resistance (actually 0);

2) Because it does not jam during operation (in the absence of lubricant), it can be reliably used in corrosive media and low-boiling liquids;

3) In a wide range of pressure and temperature, it can achieve complete sealing;

4) It can realize fast opening and closing, and the opening and closing time of some structures is only to ensure that it can be used in the automation system of the test bench. When the valve is opened and closed quickly, the operation is shock-free.

5) The spherical closing piece can be automatically positioned at the boundary position;

6) The working medium is sealed and reliable on both sides;

7) When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause the erosion of the sealing surface;

8) Compact structure and light weight, it can be considered the most reasonable valve structure for cryogenic medium system;

9) The valve body is symmetrical, especially the welded valve body structure, which can well withstand the stress from the pipeline;

10) The closing part can withstand the high pressure difference when closing.

11) The ball valve with all-welded valve body can be buried directly in the ground, so that the valve trim is not corroded, and the maximum service life can reach 30 years, which is the most ideal valve for oil and gas pipelines.

Since ball valves typically use rubber, nylon, and PTFE as seat ring materials, its operating temperature is limited by the seat seal material. The shut-off effect of the ball valve is accomplished by the metal ball pressing against each other between the plastic valve seats under the action of the medium (floating ball ball valve).

Under the action of a certain contact pressure, the seat seal ring is elastic-plastic deformed in some areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the ball and ensure the sealing performance of the ball valve.

Ball valves have the following advantages:

1。The fluid resistance is small, and its resistance coefficient is equal to that of a 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 used plastic, with good sealing, and has been widely used in vacuum systems.

4。It is easy to operate, quick to open and close, and only needs to rotate 90° from full open to full closed, which is convenient for long-distance control.

5。It is easy to maintain, the structure of the ball valve is simple, the 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 when the medium passes, it will not cause erosion of the sealing surface of the valve.

7。It can be used in a wide range of applications, from small to a few millimeters and several meters 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.

Disadvantages of Ball Valves:

1) Since the most important seat sealing ring material of the ball valve is PTFE, the temperature resistance level of PTFE is low, and it can only be used in the case of less than 180.

Beyond this temperature, the sealing material will deteriorate. In the case of long-term use, it is better to use the ball valve in an environment where the temperature does not exceed 120.

2) Its regulation performance is worse than that of globe valves, especially pneumatic valves (or electric valves).

A ball valve is a type of valve that controls the flow or truncation of a fluid by the rotation of the ball. Its main effects include the following:

V-Ball Valve. 1.Fluid Cut-off:

The ball valve can achieve the cut-off function of the fluid by rotating the ball so that it aligns or misaligns the liquid flow channel between the ball and the valve body. When the ball is aligned with the valve body channel, the fluid can flow through the valve; When the ball rotates so that it is not aligned with the valve body channel, the valve can cut off the fluid and stop the flow of fluid.

2.Fluid regulation and control: The ball valve can realize the partial truncation or flow of the fluid by rotating the ball, so as to realize the regulation and control function of the fluid.

By rotating the angle of the sphere, different degrees of flow control can be achieved, from a completely closed to a fully open state, or a partial flow can be achieved in the middle position.

V-Ball Valve. 3.Fast fluid switching: The ball valve has the characteristics of fast switching, which can quickly realize the on/off operation of the fluid, and is suitable for occasions that need to quickly cut off the flow of fluids to avoid fluid leakage and waste.

4.High pressure resistance and high temperature resistance: Ball valves are usually suitable for high pressure and high temperature fluid media, with good pressure resistance and temperature resistance, and can work stably in high pressure and high temperature environments.

5.Good sealing: The ball valve forms a complete tight seal between the ball and the valve seat in the closed state, which has good sealing performance and can effectively prevent fluid leakage.

6.Simple structure and easy maintenance: The structure of the ball valve is relatively simple, consisting of fewer parts, and is easy to install and maintain.

In general, ball valves have a wide range of applications in the industrial field, mainly used for the cut-off, regulation and control of fluids, with fast switching characteristics, pressure resistance, temperature resistance and good sealing performance, suitable for various fluid media and process requirements.

1. In China, the use of ball dust valve is very extensive, generally used in refining, pharmaceutical, chemical, long-distance pipelines, papermaking, electric power, municipal, steel and other industries, and has a pivotal position in China's economic development. Ball valve is a widely used one of the valves, and there are many types of it, such as: three-way ball valves, flanged ball valves, fixed ball valves, and so on.

2. The ball valve is used in the medium pipeline as a function of regulating and controlling the simple return, which is generally installed horizontally in the pipeline, and has the functions of distribution, cutting off and changing the flow direction of the medium. The ball valve only needs to be rotated 90° to achieve a tight seal, and its body can be used as a whole or individually. The sealing surface of the ball valve is usually in a closed state with the spherical surface, so it is not easy to be eroded by the medium, easy to operate, simple and compact structure, and can be used in working conditions with water, natural gas, acid, solvent, etc.

No wear of the <> switch: the ball rotates after deviating from the valve seat, which eliminates the friction with the valve seat and solves the wear problem of the seat of the traditional ball valve, gate valve and plug valve.

Single seat design: The static single seat of the orbital ball valve can ensure zero leakage in both directions of the reversal, and avoid the problem of increasing pressure in the inner cavity of the double valve seat.

Anti-wear hard sealing surface spool: The sealing surface of the spool is surfacing with a layer of cemented carbide and polished, which can meet the sealing performance in very harsh media occasions.

Double Stem Guide Pin: The stem guide groove slides along the hard guide pin to smoothly control the lifting and rotation of the stem.

Mechanical Wedge Force: The cam slope at the lower end of the stem provides a mechanical wedge force to ensure continuous adhesion between the spool and the seat piece.

Low torque operation: because the sealing surface of the orbital ball valve is frictionless and the rotational torque is small, except for the extra-large size that requires the gear to be outward, it can be equipped with a pinion.

Optimal flow characteristics: Both the full bore and the standard bore have a high CV value, which reduces the resistance loss along the line and minimizes wear problems.

Self-cleaning: When the valve core deviates from the valve seat, the medium can flow 360 degrees along the sealing surface to flush out the impurities in the medium.

Fillable Grease: Maintenance can be carried out during operation, and the grease is injected through the grease injector to fully control the valve and prevent leakage.

Long life: Orbital ball valves can replace ordinary ball valves, gate valves, globe valves, and plug valves that are prone to failure of sealing pairs. The unique characteristics of the orbital ball valve can effectively reduce the failure rate of installation and installation, and greatly reduce the user's use and maintenance costs.

The <> rail ball valve is a new type of structure valve, and the key to the design of this structure is that it combines the advantages of ball valve and gate valve. The ball punch body of the orbital ball valve is a combined ball, and the middle of it is a wedge cone. There are 5° bevels on each side, and two spherical discs with bevels on both sides.

The spherical disc and the cone are connected by a dovetail or T-groove, which can slide against each other.

The upper and lower parts of the spherical disc are limited by a limiting ring and an adjustment pad respectively, so that it cannot rise or fall with the wedge cone, and can only move with the wedge cone in a horizontal space. The lower end of the stem is integrated with the wedge cone by threads and pins, and the trapezoidal thread at the upper end is mated with the stem nut, and the rotation of the stem nut is driven by a hand wheel, bevel tooth belt wheel, electric or pneumatic device. The middle part of the valve stem is provided with a track pin, and a roller is installed at both ends of the pin, and the roller can roll in the guide groove of the support, and the movement trajectory of the valve stem is limited by the guide groove.

When the valve is opened: rotate the handwheel counterclockwise, drive the wedge cone to rise through the stem nut and the valve stem, so that the ball flap is closed to the middle, and it is separated from the sealing surface of the valve body, and then the wedge cone drives the ball flap to rotate 90° to open the valve. When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane makes the ball disengage from the valve seat, and the valve stem continues to lift, and interacts with the guide pin in the spiral groove of the valve stem, so that the ball begins to rotate frictionlessly 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.

When the valve is closed, the handwheel is rotated clockwise, the stem begins to descend and the ball leaves the seat and begins to rotate, and the stem is acted upon by a guide pin embedded in the spiral groove on it, so that the stem and the ball rotate 90° at the same time. To the valve closing position, the angular plane at the bottom of the valve stem is mechanically wedged to compress the ball so that it is tightly pressed on the valve seat, and then it is stretched out to both sides, leaning towards the sealing surface of the valve body to realize the valve closing. The trajectory of the orbital ball valve has the characteristics of gate valve and ball valve, so its performance has the advantages of both gate valve and ball valve.

The similarities with the gate valve are: 1. Corrosion-resistant is the same as the gate valve, the valve seat and spherical disc sealing surface can be surfacing or sprayed with high-hardness, corrosion-resistant alloy materials, which can be applied to various high-temperature, high-pressure, low-temperature, corrosion-resistant medium pipelines. 2. Short stroke; 3. Small installation space

Compared with the gate valve, the orbital ball valve has a compact structure and a small installation height, and its installation height is less than 1 3 of the gate valve of the same specification, which is conducive to the pipeline layout. 4. Fast opening speed; 5. There is no friction on the sealing surface, when the valve is opened and closed, because the up and down movement of the cone drives the spherical disc to open or close, so as to seal or separate from the sealing surface of the valve body, so there is no friction between the sealing surfaces of the valve, and the sealing performance is good and the service life is long.

<> Introduction of Ball Valve:

The ball valve of the Kals pump valve is a valve with a ball with a circular channel as the opening and closing parts, and the ball rotates with the valve stem to realize the opening and closing action.

The opening and closing part of the ball valve is a perforated sphere, which rotates around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel.

Ball valves are mainly used to open and close piping and equipment media.

The main advantages of the introduction of ball valves are as follows:

It is suitable for frequent operation, and the opening and closing is fast and light.

Low fluid resistance.

The structure is simple, relatively small in size, light in weight, and easy to maintain.

Good sealing performance.

It is not limited by the installation direction, and the flow direction of the medium can be arbitrary.

No vibration, low noise.

The main disadvantages of ball valves are as follows:

Ball valves can be divided into floating ball valves, fixed ball valves, elastic ball valves and oil-sealed ball valves according to the structural form; According to the channel, it can be divided into straight energy type, angle type and tee type, etc., and the three-way type can be divided into two types: T-shaped and L-shaped. According to the connection method, it can be divided into three types: threaded connection, flange connection and welded type.