Is it better to use a gate valve or a two piece ball valve

The working principle of one-piece ball valves, that is, wide ball valves, is to rely on rotary valves to make the valve unblocked or occluded. The ball valve switch is lightweight, small in size, can be made into a large caliber, 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.

Structural features of two-piece ball valve:

1. There is no friction in opening and closing. This function completely solves the problem of traditional valves affecting the sealing due to the friction between the sealing surfaces.

3. Single seat design. It eliminates the problem that the medium in the cavity of the valve affects the safety of use due to abnormal pressure increase.

4. Low torque design. The valve stem with special structure design can be easily opened and closed with only a small handle valve.

5. Wedge-shaped sealing structure. The valve is sealed by the mechanical force provided by the valve stem to press the ball wedge to the valve seat, so that the sealing of the valve is not affected by the change of pipeline pressure, and the sealing performance is reliably guaranteed under various working conditions.

6. Self-cleaning structure of sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline passes evenly along the sealing surface of the ball at 360°, which not only eliminates the local scouring of the valve seat by the high-speed fluid, but also washes away the accumulation on the sealing surface to achieve the purpose of self-cleaning.

Shanghai Taitong valve ball valve, butterfly valve, gate valve...

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.

Gate valve and ball valve are two different valves, and there are differences in use, so you can't simply say who is good and who is bad, list the advantages and disadvantages of gate valve and ball valve for your reference:

Advantages of Gate Valve:

1. The flow resistance is small, the medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small.

2. It is more labor-saving when opening and closing, which is compared with the globe valve, because whether it is open or closed, the direction of movement of the ram is perpendicular to the direction of medium flow.

3. The height is large, the opening and closing time is long, the opening and closing stroke of the ram is large, and the lifting is carried out through the screw.

4. The phenomenon of water hammer is not easy to occur, because of the long closing time.

5. The medium can flow in any direction on both sides, which is easy to install, and the two sides of the gate valve channel are symmetrical.

Disadvantages of gate valves: erosion and abrasion are easy to cause between sealing surfaces, and maintenance is difficult. The overall size is large, and a certain amount of space is required for opening, and the opening and closing time is long. The structure is more complex.

Advantages of Ball Valves:

1. It has the lowest flow resistance (actually 0);

2. Because it will not get stuck when working (when there is no lubricant), it can be reliably used in corrosive media and low boiling point liquids;

3. In a large range of pressure and temperature, it can achieve complete sealing;

4. It can realize rapid 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, there is no impact in operation;

5. The spherical closing part 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. The ball valve with the 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.

Disadvantages of ball valves: PTFE, the seat seal ring material, has a low temperature resistance rating and can only be used in the case of less than 180C. Beyond this temperature, the sealing material will deteriorate. In the case of long-term use, it will generally only be used under 120.

The advantages of gate valves are low resistance, tight closing, no water hammer, and are widely used in shut-off valves for various liquids and gases.

It also has a certain adjustment function, but when it is partially opened, the ram is susceptible to fluid wetting, and the alarm plate flutters when the fluid flows, and the sealing surface is easy to wear.

The disadvantage of the gate valve is that the structure is complex, it is more expensive, it is not easy to repair, and the solid substance is easy to be deposited in the valve seat groove and is not tightly closed.

The ball valve has a simple structure, the ball valve is light in weight compared with the globe valve, the structure is relatively simple, and its overall weight is very light, so it can play a good role in the low-temperature medium system.

The ball valve seal surface is easy to process, the sealing is good, the operation is easy, the opening and closing is fast, and the start-up and closing time is very short, which enables the testing system to be quickly optimized, and there is no shock during the start-up and closing of the valve.

Ball valves cannot be used to regulate flow and are suitable for high-pressure pipelines.

The advantages of some gate valves are low resistance, tight closing, no water hammer, and are widely used in shut-off valves for various liquids and gases. It also has a certain adjustment function, but when partially opened, the ram is susceptible to fluid wetting, and the ball valve cannot be used to regulate the flow rate, which is suitable for high-pressure pipelines.

Hope it helps.

According to years of practice, it is concluded that the gate valve is better than the goal in terms of flow adjustment. However, the switch is slower. The ball valve is fast to open and close, but the frequent opening and closing produces internal leakage, and the durability is not as good as that of the gate valve.

Ball valve is good. Ball valve is mostly used in industrial gas valves, and corrosive liquids, ball valve structure is tight, good flow interception, large diameter and large flow rate are good, ball valve is only suitable for pipe diameter within 50 mm, easy to use, ball valve is more refined, and the full bore ball service valve flow resistance is basically zero, and it has two sealing surfaces, the use of good plastic, strong sealing, can achieve complete sealing, zero leakage effect.

The ball valve only needs to rotate 90 degrees from full open to full closing, which has the advantages of fast opening and closing, convenient remote control, simple maintenance of ball valve, easy disassembly, easy replacement, and the use range of ball valve is many, the diameter can be from a few millimeters to several meters, the pressure can reach more than 32MPa, and it is suitable for being equipped with actuators.

Ball valve function classification:

1. Bypass valve.

The ball valve is generally opened by static water, so the bypass valve is flattened first, that is, both sides are filled with water.

2. an air valve.

When filling with water, the air is removed and the float closes the valve by itself, and when the water is drained, the air is replenished, and the float descends by itself.

3. Pressure relief valve.

When opening and closing the valve, remove the pressure water between the flap and the sealing cover, so as to avoid wearing the sealing cover.

4. Blowdown valve.

Discharge sewage from the inner and lower parts of the spherical shell. <>