Stainless steel ball valve The difference between one piece and two piece, three piece type

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.

Three-piece ball valves offer 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 used plastic, with good sealing, and has been widely used in the vacuum system.

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.

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.

Difference Between One-Piece Ball Valve, Two-Piece Ball Valve and Three-Piece Ball Valve:

According to the structure, the threaded ball valve with internal thread is divided into one-piece ball valves, two-piece ball valves and three-piece ball valves, and understanding their characteristics and differences will help us choose the right ball valve to use.

First of all, let's understand what is a one-piece ball valve, a two-piece ball valve and a three-piece ball valve.

One-piece ball valve refers to a ball valve with a small diameter of internal thread connection, composed of an integral one-piece valve body, and an integral valve body, which is often used for small-sized valves.

Two-piece ball valve, also known as two-piece ball valve, refers to a small-diameter internal thread connection, the valve body is divided into two parts, buckle form, usually used valve.

Three-piece ball valves, which are internally threaded, and the valve body is composed of three parts, are usually used for larger and more important valves.

Their differences and characteristics can be analyzed from the following aspects:

1. Distinguish from the structure.

The one-piece ball valve is an integrated type composed of balls, tetrafluorine rings, and lock nuts, and the diameter of the ball is slightly smaller than the diameter of the pipe, similar to the wide-type ball valve, which is generally a reduced diameter, and the actual flow of the aperture is one size less than the diameter DN, and the flow rate is relatively small.

The two-piece ball valve is composed of two parts, the sealing effect is better than that of the one-piece ball valve, the diameter of the ball is the same as that of the pipe, and it is easier to disassemble than the one-piece ball valve.

The three-piece ball valve is composed of three parts, the bonnet on both sides and the middle valve body, the three-piece ball valve is different from the two-piece ball valve and the one-piece ball valve in that it is easy to disassemble and maintain. Stronger pressure resistance.

2. Distinguish from the pressure yard hail.

The pressure resistance of three-piece ball valves is much higher than that of one-piece and two-piece ball valves. The outer edge of the main three-piece ball valve is fixed by four bolt ridges, which plays a good tightening role. Precision cast body can be pressured up to 1000 psi. Higher pressures require a forged body.

3. Distinguish from an economic point of view.

Because the main body material of the one-piece ball valve is less than the other two types, it is preferential and has the same use as the wide ball valve. The two-piece ball valve is higher than the one-piece type, and the three-piece type is composed of three parts of the Sakura Tomb in line with the higher pressure valve body, and the material is higher than the other two types.

Stainless steel two-piece ball valve specifications and models.

Specification model: 1 4"-4".

Material: CF8, CF8M, CF3M4408, WCB, etc.

Applicable working conditions: Mainly used in petroleum, chemical and chemical industries, food, medicine, railway, water treatment, iron and steel, metallurgy and other industries.

Stainless steel two-piece ball valve brand.

Shanghai Juliang Valve Group **** (JVL China. Juliang Valve Industry) Jingang brand belongs to Shanghai Jingang automatic control valve.

Xintai valve****.

Shanghai Shangzhao valve manufacturing.

Changzhou Jiumu automatic control valve****.

Shanghai Wakamatsu metal products ****.

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Stainless Steel Manual Flange Ball Valve 304 Stainless Steel Floating Ball Valve Two Piece Stainless Steel Ball Valve.

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Two-piece shank with locking ball valve.

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1. The opening process is in the closed position, and the valve ball is pressed on the valve seat by the mechanical pressure of the valve stem. The needle turns the handwheel, the stem moves in the opposite direction, and the angular plane at the bottom of the stem lifts the ball out of the seat. The seat continues to rise and interacts with the guide pins in the seat spiral groove, causing the ball to begin to rotate frictionlessly.

The seat is raised to the limited position and the ball is raised to the fully open position. When the gas phase and the liquid phase come into contact with each other at each layer, the gas phase partially condenses and the liquid phase partially vaporizes. Due to the partial vaporization of the liquid, the light components in the liquid phase diffuse to the gas phase, resulting in an increase in the light components in the vapor; The partial condensation of the steam causes the recombinant fraction in the steam to diffuse to the liquid phase, and the recombinant fraction in the liquid phase increases, so that the gas-liquid phases in contact with each other on the same layer tend to be balanced.

The three-piece stainless steel ball valve has low fluid resistance, and its resistance coefficient is equal to the resistance coefficient of the same length pipeline. The three-piece stainless steel ball valve has a simple structure and small size, and the weight of Kaibi is light. The three-piece stainless steel ball valve is tight and reliable.

Plastic is widely used in the surface material of ball valve protrusion, which has good sealing performance and is widely used in vacuum systems. The three-piece stainless steel ball valve is easy to operate and quick to open and close. From fully open to fully closed, only 90 rotations are required, which is convenient for remote control.

The three-piece stainless steel ball valve is easy to maintain, the ball valve has a simple structure, generally a movable sealing ring, and is easy to disassemble and replace. Three-piece stainless steel ball valve When the valve is fully open or closed, the sealing surface of the ball and seat is isolated from the medium.

Two. When closing, turn the hand slag Sun Nian wheel clockwise, the valve seat begins to lower, and the ball leaves the valve seat and begins to rotate. Continuing to rotate the handwheel, the seat pin is embedded in its spiral groove, causing the seat and ball to rotate 90 at the same time.

When closed, the ball rotated 90 percent without touching the seat. After a few turns of the handwheel, the corner plane at the bottom of the stem mechanically wedges the ball and presses it tightly against the seat, achieving a complete seal.

The one-piece stainless steel ball valve is a manual valve, the structural design is integral, and the ball is stabilized by a plug head, so that it can be convenient in maintenance, and the caliber of the ball valve is also small, the ball is put into it from the side of the valve body, and the valve seat should be screwed in, and then the ball is pressed.

Some non-standard one-piece ball valves have a short structure, so the best way to distinguish them is from the structure of the valve body.

The two-piece stainless steel ball valve is composed of bolts connecting the left and right valve bodies, and the ball valve is clamped by the two valve bodies when fixed, and the maintenance is relatively difficult, and the most important thing is to see how tight the screws in the middle are, which is directly related to whether the seal is tight.

In addition, it is mainly used in atmospheric pressure and high pressure environments, such as non-standard nominal diameter below DN50 is also a two-piece valve.