What is the difference between a ball valve and a ball plug valve, and what is the difference betwee

Both ball valves and ball plug valves use balls as valve closing elements, but their structures and functions are different.

Sea shield ball valve. A ball valve is a kind of valve that uses the ball as a closing element to control the flow or truncation of the medium by rotating the ball. The ball structure of the ball valve is spherical, which can realize the advantages of fast switching, reliable sealing, and low flow resistance, and is widely used in petroleum, chemical, natural gas, pharmaceutical, metallurgical and other industries.

Ball plug valve is a kind of globe valve, the ball structure is similar to that of ball valve, but there is a ball boss at the bottom of the ball of the ball plug valve, and the flow or truncation of the medium is controlled by rotating the boss. The ball plug valve has a simple structure and good sealing performance, and can be used for pipeline control under harsh conditions such as high temperature, high pressure, and corrosive media.

Therefore, although ball valves and ball plug valves both use the ball as the valve closing element, they are still different in terms of structure and application.

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 ball valve ball has holes.

Rotate the sphere to control the closure.

Ball plug valves are similar to globe valves.

It is the solid ball that directly blocks the round mouth.

Ball valves, gate valves, are copied.

It belongs to the shut-off valve bai door, which is also divided into a lot of small categories of du in these two types of valves, and the difference in the performance of the use of zhi is very large.

Advantages of ball valves: good sealing performance, small switching torque, long life, especially for the installation space is limited, it is very easy to use.

The advantages of gate valves: small medium flow resistance, not easy to produce water hammer phenomenon (long switching time), simple structure.

Easy to maintain.

01 Spool structure.

1. The valve core of the ball valve is a ball, because of the structure of its fixed ball, the valve is fixed under the condition of high pressure, especially in the closed state, the valve ball is fixed, and the upper valve stem and the lower branch shaft decompose part of the pressure from the medium, so the valve ball does not offset downstream, so the pressure of the downstream valve seat is relatively small, so the friction that the valve overcomes when the valve is small, the wear of the valve seat is small, and the service life of the valve is long, especially for the valve that often acts, this structure is more suitable.

2. The valve core of the gate valve is a wedge-shaped valve plate or a parallel valve plate. Its lower part has no pivot. Therefore, when the valve is applied under high pressure and in the closed state, the valve plate bears a great pressure from the medium, and because of its flat valve plate structure, all the medium pressure acts on the valve plate at the same time, then the valve plate will be pressed to the downstream valve seat (at the same time, excessive pressure acts on the vertical plane of the valve plate, which will make the valve plate whether it is a wedge or a parallel double gate, there will be a certain deformation), then the valve needs to overcome great friction when it is opened, and the wear of the valve seat prints the life of this valve is short.

02 Seat structure.

The ball valve has a spring inside the seat, and the sealing design of the seat makes it difficult for the residue in the medium to enter the seat. The valve seat is in long-term contact with the valve ball under the action of the spring, and when the valve is moving, the valve seat has a certain scraper effect, which can scrape off the slag attached to the valve core after long-term operation, and can ensure the sealing performance of the valve for a long time. Especially in the application of high temperature and high pressure, due to the selection of the material of the valve seat, valve body and valve ball with the same thermal expansion coefficient when selected, as well as the valve seat with spring structure, when the valve is closed, the huge temperature difference and the drop in temperature will not affect the action of the valve, and the valve will not produce the phenomenon of locking.

The seat of the gate valve is very narrow, and in high temperature applications, when the valve is closed, the temperature drops because the medium does not flow, so the seat will tighten, resulting in a large compression force on the valve plate. When the valve is opened again, a large torque is required to overcome this compressive force, which will cause great damage to the valve seat and affect the life of the valve seat. This affects the service life of the valve.

In addition, due to the weight of the ram itself when the valve is closed, it will bring a great impact force to the valve and make a lot of noise.

03 itinerary. The ball valve has an angular stroke and therefore has a small installation space and low height. The stroke of the gate valve is straight, so the installation space is large and the height is high.

04 Actuator.

Due to the fixed ball design, the opening and closing torque of the ball valve is small, so the actuator is correspondingly small. Gate valves have a large compression force on the valve seat due to the large pressure force of the valve plate, so it takes a large torque to overcome this large friction force, and the actuator is equipped with a large one.

05 Maintenance. Ball valves are generally maintenance-free, especially the ball and seat, which generally do not need to be replaced within 5 years due to low wear. Gate valves require regular maintenance due to the high wear and tear of the valve seats.

The role of the ball valve:

The opening and closing part of the ball valve is a round ball with holes, which uses the ball core to rotate 0-90 back and forth around the axis of the valve stem, so as to achieve the purpose of opening or closing the valve. The ball valve has many functions, and is generally used in the pipeline to cut off or adjust the medium, among which the three-way ball valve can flexibly cut off, distribute and change the flow direction of the medium. The sealing surface of the ball valve is usually in a state closed 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.

Uses of Ball Valves:

According to the structural form, ball valves can be generally divided into three categories: floating ball valves, fixed ball valves, and elastic ball valves. According to the different sealing performance, it is divided into hard seal ball valve and soft seal ball valve, among which the soft seal ball valve has good sealing performance and can achieve zero leakage, which is generally used in the normal temperature and pressure pipeline with corrosive medium, and the hard seal ball valve can not only be used for normal temperature and pressure, but also can be used for low temperature and low pressure and high temperature and high pressure pipelines.

1) Floating ball valve

The ball of the floating ball valve is floating, supported by the connection of two valve seats, under the action of medium pressure, the ball can produce a certain displacement and adhere to the valve seat sealing surface of the outlet end to ensure that the outlet end is sealed. However, if the load of the ball on the working medium is fully transferred to the outlet seal, the ball may deflect when subjected to higher pressures. Therefore, the ball valve of this structure is generally suitable for normal pressure or low pressure working conditions.

2) Fixed ball valve

The name of the fixed ball valve is that the ball is fixed, and when the valve is closed, the ball valve will not move even after being pressurized. Fixed ball valves are equipped with a floating seat, and after being pressured by the medium, the seat moves, so that the sealing ring is pressed against the ball to ensure sealing. Usually equipped with sliding bearings or rolling bearings on the upper and lower shafts of the ball, which can be used for small operating torque, and are generally suitable for high-pressure and large-diameter pipelines.

Other common classifications of ball valves, disc sock Xiaoyuan valve, orbital ball valve, V-type ball valve, O-type ball valve, shut-off ball valve, three-way ball valve, four-way ball valve, forged steel ball valve, ash discharge ball valve, anti-sulfur ball valve, eccentric ball valve, insulation ball valve, pneumatic ball valve, electric ball valve, ferrule ball valve, welded ball valve. Among them, the V-type ball valve has a shear effect, especially suitable for media containing fibers, fine solid particles, slurry and so on. The three-way ball valve can also be divided into T type and L type.

The T-type can make three intersecting pipelines connect with each other or cut off any one of the channels, and play the role of diversion and confluence. The L-type only connects two pipes perpendicular to each other, and cannot connect the third pipeline at the same time, and mainly plays a distribution role.

1. The working principle of one-piece ball valve and two-piece ball valve is different: the working principle of one-piece ball valve is the mechanical pressure effect of the valve stem; The working principle of the two-piece ball valve is to make the valve open or occluded by rotating the valve.

2. The valve body of one-piece ball valve and two-piece ball valve is different: the one-piece type is fixed by a plug head; The two-piece ball valve is fixed by two pieces of the valve body clamping the ball, and the maintenance is relatively complicated, and the tightness of the bolt in the middle is very critical.

3. The closing parts of one-piece ball valves and two-piece ball valves are different: the closing parts of one-piece ball valves are a ball, and the balls rotate around the center line of the valve body to achieve opening and closing; Two-piece ball valves, on the other hand, have no special requirements.

Difference Between Ball Valve and Gate Valve:

First, the working principle.

Ball valve: The opening and closing parts (balls) are driven by the valve stem and rotate around the axis of the ball valve. The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium, it only needs to rotate 90 degrees of operation and a small torque to close tightly.

Ball valves are most suitable for on/off valves, and can also be used for fluid regulation and control.

Gate valve: the opening and closing parts are the ram, the direction of movement of the ram is perpendicular to the direction of the fluid, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled. Gate valves are sealed by the contact between the valve seat and the ram, and usually the sealing surface will be surfacing with metal materials to increase wear resistance, such as surfacing welding, stainless steel, etc.

The gate has a rigid gate and an elastic gate, and according to the different gates, the gate valves are divided into rigid gate valves and elastic gate valves.

Second, its own characteristics.

Ball valve: wear-resistant; Good sealing performance; Long service life; It has a flow resistance of almost 0.

Gate valve: small flow resistance of straight flow channel; The opening and closing is more labor-saving, but the opening and closing time is long; Not prone to water hammer.

3. Structural form.

Ball valve: According to the different structural forms, it can be divided into floating ball ball valve, fixed ball ball valve and elastic ball valve.

Gate valve: According to the different structural forms, it can be divided into open rod gate valve and dark rod gate valve.

Fourth, the scope of application.

Ball valves: mostly used in steam pipelines, gas pipelines, and heating pipelines.

Gate valves: mostly used in water supply and drainage pipelines, sewage pipelines and other water system pipelines.