The difference between threaded copper globe valve and copper core globe valve

Threaded copper globe valve body material is copper, the valve core is also copper, the copper core globe valve body is generally cast iron, and the valve core or sealing surface is copper.

Here are some well-known brands recognized in the copper valve industry, which are widely recognized and enjoy 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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.

A globe valve is a type of valve that is used for sealing. It is widely used in our production and life. Let's take a look at the classification of globe valves.

Speaking of which, you may have such doubts, so what is the working principle of the copper globe valve? Let's introduce it to you.

Copper globe valve is the most commonly used valve in our lives, so why is it so popular among consumer groups? It is because of its own metal material that makes it more durable, and it is cheap, simple to manufacture and many other advantages in one, suitable for various working environments under pressure. The working principle itself is also very simple, that is, the force is applied through the valve stalk, and then the disc and the valve seat are tightly closed together, so as to prevent the flow of the medium.

Here we would like to remind you that we should pay attention to the direction of the globe valve when installing the globe valve notice, because it only allows the medium to move in one direction. If you want to cut off the flow of media for a long time, it is not recommended to use it, because it does not have a strong long-term sealing ability. Let's introduce the classification of globe valves.

Here, according to the position of the thread on the globe valve, it can be divided into upper threaded stem globe valve and lower threaded stem globe valve. The difference between these two types of globe valves is that the thread of the former is outside the valve body, while the latter thread is inside the valve body, each has its own advantages, the former is more commonly used, and the latter is only used in small diameter and low temperature.

Then, according to the different channel directions of the globe valve, it can be divided into four types: direct flow globe valve, angle globe valve, plunger globe valve, and straight-through globe valve. Let's briefly introduce the advantages of these four globe valves. The first type of flow shut-off valve is a diagonal line between the valve body and the medium flow channel, which reduces pressure loss.

The second type of angle globe valve is that the medium in the valve body only needs to change the direction once, which also reduces the valve pressure need. The fourth type of piston globe valve, this kind of globe valve is the most complex, so I will not introduce it in detail here.

The globe valve, also known as the shut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the valve disc, the resistance that needs to be overcome by the operating force is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium, and the force of closing the valve is greater than the force of opening the valve, so the diameter of the valve stem should be larger, otherwise the failure of the top bend of the valve stem will occur.

The needle valve is a valve that can be precisely adjusted, and it is used in a wide range of applications, such as the cutting distance for flame cutting, and the knob for adjusting the flame temperature is the needle valve. The instrument needle valve is an important part of the instrument measuring pipeline system, mainly including globe valve and ball valve, and its function is to open or cut off the pipeline path. The spool of a needle valve is a very sharp cone that is inserted into the seat like a needle, hence the name.

Needle valves. Refers to a certain valve structure;

Globe valve: one refers to the valve structure, and the other refers to the valve used to close the pipeline;

A needle valve is a seal by pressing a cone, cone or ball into the center of the seat. The sealing effect is good, and it is suitable for working under the conditions of high pressure, small flow and small caliber; Large-diameter is rare, has good flow adjustment performance, is easy to block, and is easy to lock between the spool seats in the case of large changes in cold and heat. It is used in instruments, meters, and control equipment.

The globe valve relies on pressure to tightly fit the sealing surface of the spool with the sealing surface of the valve seat to prevent the flow of medium. Widely used, cheap, adaptability and regulation performance are good, because of the structural characteristics, the lower the pressure, the easier the sealing effect to do, so it is more used in low and medium pressure conditions. It is mostly used on process pipelines.

The basis for determining whether it is needle-shaped or cut-off is to see whether the spool (disc) is covered on the seat or inserted into the seat. (Especially needle valves with taper discs, which are close in shape to globe valves).

The difference is: 1. The sealing surface, that is, the fundamental difference between the globe valve and the needle valve, the sealing surface of the direct discharge is PTFE or metal embedded in the disc of the globe valve, while the sealing surface of the needle valve is conical.

2. Caliber, globe valves generally have many large calibers, while needle valves are generally larger calibers.

1. The working principle of the needle valve is like the globe valve, but it has a smaller flow section, usually not greater than DN10, and the model angle is selected according to the need, and it is used in a small flow rate to accurately control the flow, which is generally a threaded connection. Generally speaking, the needle valve is a kind of globe valve, and the needle valve is used for small instrument pipelines, and the globe valve is used for large process pipelines.

2. The spool of the needle valve is needle-shaped, while the spool of the globe valve is cylindrical, and the pressure of the general needle valve is 3 kinds, 3000psi, 6000psi and 10000psi, and the globe valve is different.

Nominal diameter dn mm Pipe thread Size Weight kg do h hi d 6 1 4 60 92 102 4 10 3 8 60 90 100 5 15 1 2 65 65 97 107 6 20 3 4 80 80 109 121 8 25 1 100 90 122 132 10 32 11 4 140 128 180 191 15 40 11 2 160 148 200 215 18 18

The globe valve is a forced seal valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak.

Principle of operation. 1. When the handwheel turns clockwise, the valve stem moves downward, and the valve disc descends to seal the sealing surface and cut off the passage. When reversed, it opens and the stem is raised to the highest point and the seal works.

2. An upper seal has been added to this valve. When the valve is open, it seals with the packing in two layers and has a certain protective effect on the packing.

3. The valve is made of nylon products as the sealing surface, the packing is a soft forming packing, and the upper seal is also a soft material, and the sealing performance is good.

Advantage 1: Simple structure, convenient manufacturing and maintenance.

2. The working stroke is small and the opening and closing time is short.

3. Good sealing, small friction between sealing surfaces, and long service life.

b, The disadvantages of internal thread shut-off valve are as follows:

1. The fluid resistance is large, and the force required for opening and closing is large.

2. It is not suitable for media with particles, large viscosity and easy coking.

3. Good adjustment performance.

The types of globe valves are divided into external thread type and internal thread type according to the position of the stem thread. According to the flow direction of the medium, there are straight-through type, DC type and angular type. Globe valves are divided into sealing forms, including packing seal globe valves and bellows seal globe valves.

The opening and closing parts of the copper globe valve (Stop Valve, globe valve) are plug-shaped discs, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid. The movement form of the valve stem, (common name: dark rod), there is also a lifting rotary rod type, (common name:

Open rod) globe valve is only suitable for full opening and full closing, and is not allowed to be adjusted and throttled.