The main standard of shut off valves for stainless steel globe valves

1. GB T 12233-2006 "General Valve - Iron Globe Valve and Lifting Check Valve".

2. GB T 12235-2007 "General Valve Flange Connection Steel Globe Valve and Lifting Check Valve".

3. JB T53174-94 "Globe Valve Product Quality Classification".

4. JB T53165-92 "High Pressure Balance Globe Valve".

5. GB T 587-2008 "Marine Flange Bronze Globe Valve".

6. GB T 590-2008 "Marine Flange Cast Iron Globe Valve".

7. GB T 8464-2008 "Iron and Copper Threaded Connection Valves".

8. Internal thread connection gate valve, globe valve, ball valve, check valve Basic size Iron globe 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.

Imported national standard globe valve (stop valve, globe valve) is also called cut-off door, using the national standard standard, its opening and closing parts are plug-shaped valve discs, sealing the top is a plane or sea cone surface, and the valve disc moves in a straight line along the center line of the valve seat to realize the opening and closing of the valve. The movement form of the valve stem, (common name: dark rod), there are also lifting and rotating rod types, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

The stem axis of the globe valve is perpendicular to the seat sealing face. The stem opening or closing stroke is relatively short.

Once the valve disc of the globe valve is in the open state, between its valve seat and the sealing surface of the valve disc, it is no longer in contact, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most of the globe valve are relatively easy to repair, and when the sealing element is replaced, there is no need to remove the entire valve from the pipeline, which is very suitable for the occasion that the valve and the pipeline are welded into one. These features make shut-off valves ideal for use as a shut-off or adjustment and throttling of media.

When the medium passes through such valves, the flow direction changes. Therefore, the flow resistance of the globe valve is higher than that of other valves.

According to the characteristics of the globe valve, the characteristics, advantages and disadvantages of the globe valve (according to the Vton globe valve as an example) are summarized.

Advantages: 1. In the process of opening and closing, the friction between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant.

2. The opening height is generally only 1 4 of the valve seat channel, so it is much smaller than the gate valve;

3. Usually there is only one sealing surface on the valve body and valve disc, so the manufacturing process is relatively good and easy to maintain.

4. Because its filler is generally a mixture of asbestos and graphite, the temperature resistance level is high. Generally, steam valves use globe valves.

5. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also be avoided;

6. External leakage, and in line with international sealing standards;

7. No fluid loss, reduce energy loss, and improve the safety of plant equipment;

8. Long service life, reduce the number of maintenance and reduce operating costs;

9. The sturdy and durable bellows sealing design ensures zero leakage of the valve stem and provides maintenance-free conditions.

10. The bellows seal globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the aging and easy leakage of the ordinary valve stem packing seal, which not only improves the energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment. For example, the imported bellows globe valve of Vton is a widely used globe valve, which is used by the majority of users in steam pipelines.

Disadvantages: Due to the change in the direction of flow of the medium through the valve, the minimum flow resistance of the globe valve is also higher than that of most other types of valves;

Due to the long stroke, the opening speed is slower than that of ball valves.

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

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

Poor regulation performance.

1. The structure is simple, and the manufacturing and maintenance are relatively convenient.

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. 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. Poor adjustment performance.

Stainless steel globe valve is a kind of globe valve, which is called stainless steel globe valve because it is made of stainless steel material. The biggest advantage of the globe valve is the use of stainless steel materials, regardless of the wind and sun, he will not rust, or the rust speed is very slow, can be used for a long time, stainless steel globe valve is a major choice for choosing the globe valve. Stainless steel globe valves are divided into electric stainless steel globe valves, pneumatic stainless steel globe valves and manual stainless steel globe valves.

Stainless steel globe valves are widely used in chemical, pharmaceutical, shipbuilding, food machinery and other industries because of their simple gate valves. The working principle is to apply pressure to the valve during the closing period of the valve, so as to force the sealing surface not to cry out and leak and achieve the effect of preventing the flow of air.

Stainless steel globe valve has the following advantages: 1. Simple structure. The simple structure makes it more convenient in the process of use and maintenance, and is deeply trusted and loved by the public.

2. Wear-resistant. The structural surface is made of stainless steel, the sealing performance is good, the contact area between the sealing surface of the valve disc and the valve body is not large in the process of use, and the exquisite design makes it easy to slide, and the safety of the operator is greatly guaranteed. 3. Good sealing performance.

The design of the valve is completely designed from these aspects to reduce the pressure of the flowing object in the valve and reduce the consumption and damage to the operator's Zheng Shen power. In order to reduce the pressure as much as possible, the design of the valve is more complex, all in all, the closure performance is good, and the operability is high.

However, there are pros and cons to everything, and there are pros and cons, and the same is true for stainless steel globe valves. In addition to the above few advantages, he also has his own fly in the ointment. 1. The fluidity of the flowing object in the valve is relatively large, and the resistance is also large, so it needs to use greater force in the process of opening and closing the valve, and the power consumption is relatively large.

2. High requirements for media. Not all media can be suitable for him, and it is not necessary to consider it for media with particles, high viscosity and easy coking. 3. The adjustment performance is relatively poor.

He regulates the medium with fluid inside, and the fluid pressure is often higher than the pressure of the shut-off valve outside, so his performance is poor.

There are two sides to everything, and we have to see both the advantages and the disadvantages. We can't blindly believe in its advantages and ignore its shortcomings, and of course, we can't blindly believe in the shortcomings of the product and ignore the advantages of the product itself. He should be judged critically on everything.

Just like the stainless steel globe valve, we need to choose and use it with our own most neutral attitude. Today's introduction to the relevant knowledge of stainless steel globe valve is here, I hope it can be helpful to everyone in life! Ludough.

You can get it for free

The stainless steel globe valve stem is designed with bellows and packing two-way sealing, and the bellows is welded into bellows parts with the lining ring and the cracked draft ring of the outer lining, and then welded with the valve stem and the guide body, and the barrier material leaks out according to the stem. Move the stem up and down to distance the shaft hole and move upwards until the distribution port of the shaft hole is in contact with the lower part of the filler. Because the lower packing is PTFE raw material, if the valve is opened too much, it may cause the shaft hole to be placed in the packing, and the valve can no longer be opened and closed, and the bellows parts will be crushed, causing the substance to leak along the valve stem.

The extension length and compression of the bellows are established according to the valve stroke, and if the upper limit is stretched or reduced, the bellows may be damaged, resulting in cracking of the pipe, and the sealing is invalid. Therefore, it is necessary to increase the limit device for valve opening and cancellation, so that in the valve opening and closing link, the bellows has always been telescopic within the design range.

The W in the globe valve J41W indicates that the sealing surface of the valve seat is directly machined by the valve body material.

Extended] J41W represents manual flange globe valve. The meanings of numbers and letters are as follows:

j stands for globe valve.

4 indicates flange connection.

1 indicates the DC channel, and the disc is unbalanced.

The globe valve is one of the more common pipe fittings in our life, which acts as our valve. Its role in different industries and to go is also different, although there are many types in our lives, but as one of the fasteners, there are certain standard requirements. Moreover, the production standards of different countries are also different, and this article will briefly introduce the requirements of different standards for you.

What are the standards for globe valves.

1. National standard globe valve.

The national standard globe valve is only suitable for full opening and full closing, and is generally not used to adjust the flow rate, and is allowed to adjust and throttle when customized. The standard implemented by the national standard globe valve is the design specification: GB T12235, and the structural length:

GB T12221, flange connection: JB T79, test and inspection: JB T9002, product identification:

gb/t12220；The structure of the national standard globe valve is simple, and the manufacturing and maintenance are relatively convenient; Its working stroke is small, and the opening and closing time is short; Good sealing, small friction between sealing surfaces, long life.

Second, the German standard globe valve.

The German standard globe valve is a bellows-sealed zero-leakage globe valve with a leakage class of 6, which can meet the requirements of most working conditions. It is mainly used in various toxic fluids, precious fluids, corrosive media and other high-demand pipeline systems that do not allow leakage. Its product specifications Fan's Shield:

DN15-DN300, operating temperature range; Pressure Range:; Main materials: WCB L, LCB, LCC, duplex steel, etc.

3. American standard globe valve.

The American standard globe valve adopts a double sealing structure: the layer-type seal is imported high-quality alloy bellows, and the second valve stem packing is used as a secondary seal, which usually does not contact with the medium. The design and manufacture of the products meet the requirements of foreign advanced standards such as the American National Standard and the British National Standard BS1873.

The external shape of the body is barrel-shaped or streamlined, the shape of the flow channel is straight-through, and the fluid resistance is small. The valve seat can be a more replaceable valve seat, and can be matched with the sealing surface material of the closing part in any combination to meet the requirements of various working conditions and prolong the service life.

The stem or mega axis of the globe valve is perpendicular to the sealing surface of the valve seat. The relatively short opening or closing stroke of the stem and the very reliable shut-off action make this valve ideal for use as a shut-off or adjustment and throttling of the medium.

Once the disc of the globe valve is opened, there is no longer any contact between the seat and the sealing surface of the disc, and it has a very reliable shut-off action, which is very suitable for the use of shut-off or adjustment and throttling of the medium.

Once the globe valve is in the open state, there is no longer contact between the valve seat and the sealing surface of the valve disc that it rents, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most globe valves are relatively easy to repair or replace the sealing elements without removing the entire valve from the pipeline, which is very suitable for the occasion where the valve and the pipeline are welded into one. The flow direction of the medium through these valves changes, so the flow resistance of the globe valve is higher than that of other valves.

Commonly used globe valves are as follows:

1) Angle shut-off valve

In an angle globe valve, the fluid only needs to change direction once, so that the pressure drop through this valve is smaller than that of a conventional globe valve.

2) DC shut-off valve

In a flow-through or Y-type globe valve, the flow channel of the valve body is inclined to the main channel, so that the degree of damage to the flow state is less than that of the conventional globe valve, so the pressure loss through the valve is correspondingly smaller.

3) Piston globe valve

This form of globe valve is a variation of a conventional globe valve. In this valve, the disc and seat are usually designed based on the plunger principle. The disc is ground into a plunger connected to the stem, and the seal is achieved by two elastic seals that are sleeved over the plunger.

The two elastomeric seals are separated by a collar and are pressed against the seal around the plunger by a load applied to the bonnet by the bonnet nut. Replaceable seals can be made of a wide variety of materials, and the valve is mainly used for "on" or "off", but is available with a special form of plunger or a special collar that can also be used to regulate the flow rate.