Manual clamp turbine butterfly valve does not need to be marked with nominal pressure?

Of course, it is necessary to mark the nominal 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.

1. The different transmission modes (handle or turbine) are mainly determined according to the size of the valve and the opening and closing torque.

2. The butterfly plate of the worm gear butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°, and when the rotation reaches 90°, the valve is fully open.

3. The clamp-type butterfly valve is to connect the valve between the two pipeline flanges with stud bolts, and the flanged butterfly valve is to connect the flanges at both ends of the valve to the pipeline flanges with bolts.

It's just that the driving mode is different, and the handle butterfly valve is generally a small caliber, because the torque of the small caliber is generally smaller, and the turbine butterfly valve can be opened and closed directly by hand with a gearbox to drive the valve stem to rotate.

The selection principle is that when the stem torque is greater than the gearbox drive, and the gearbox is controlled by a handwheel, the handwheel force is not greater than 300 Nm

The maximum pressure applicable to the clamp butterfly valve should be below 4MPa, because according to the current butterfly valve for the clamp butterfly valve, especially the butterfly valve with hard sealing structure, the greater the pressure, the greater the difficulty of opening under pressure, of course, the higher the pressure, the better its sealing performance. (FYI).

First of all, you have to understand that the clamp butterfly valve is divided into soft seal and hard seal. For soft seals, the highest nominal pressure is generally PN16, and for hard seals, the engineering pressure of the clamping butterfly valve can be higher, generally divided into PN16 and PN25I'm sorry to say wrong.

It also improves the operational performance of the valve. The characteristics of industrial butterfly valve can withstand high temperature, the applicable pressure range is also high, the A-type clamp butterfly valve is a one-section valve shaft structure, high bending strength, simple structure and low cost. We.

First, the characteristics are different.

1. Characteristics of turbine butterfly valve: the valve with metal seal generally has a longer life than the valve with elastic seal, but it is difficult to achieve complete sealing. Metal seals can accommodate higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature.

2. Characteristics of manual butterfly valve: convenient and fast opening and closing, labor-saving, low fluid resistance, and can be operated frequently. Simple structure, small size and light weight.

Slurry can be transported with minimal liquid accumulation at the pipe opening. At low pressures, a good seal can be achieved. Good regulation performance.

Second, the application is different.

1. Turbine butterfly valve application: It is not only widely used in general industries such as petroleum, gas, chemical industry, water treatment, etc., but also used in the cooling water system of thermal power station.

2. Manual butterfly valve application: used in the sulfuric acid industry: gas pipeline in the sulfuric acid industry: blower inlet and outlet in front of the furnace, relay fan inlet and outlet, electric demisting series and communication valve, S02 main blower inlet and outlet, converter adjustment, preheater inlet and outlet and other adjustment and cut-off gas volume use.

The turbine butterfly valve is also operated by manually rotating the handwheel, which belongs to the manual butterfly valve.

Handle butterfly valves and worm gear butterfly valves are both valves that require manual manual operation, commonly known as manual butterfly valves. However, there is still a difference between the two in use, and the following will introduce you to the difference between butterfly valve handle drive and worm gear drive.

Handle butterfly valve (left) and turbine butterfly valve (right).

1. The handle butterfly valve handle rod directly drives the valve plate, and the switch is fast, but laborious; The turbine butterfly valve passes through the turbine drive valve plate, which switches slowly but effortlessly. Therefore, when the pressure in the pipe is high, the handle butterfly valve is particularly laborious.

Second, the butterfly valve commonly used in the project is generally the turbine butterfly valve, because in addition to labor-saving, its sealing is better than the handle butterfly valve, especially in the environment of high switching frequency, the service life is higher than that of the handle butterfly valve.

3. The handle butterfly valve is generally within the small-caliber DN200, because the torque of the small-caliber is generally smaller, it can be opened and closed directly by hand, and the turbo butterfly valve uses a gearbox to drive the valve stem to rotate.

Fourth, the selection principle is to use the gearbox drive when the stem torque is greater than 300N·m.

Clamps and flanges are two types of connections.

The pair clamp type is cheap, ** is roughly 2 3 of the flange.

If the flanges on both sides are not aligned, the bolts will be subjected to greater shear force, and the valve is easy to leak.

The valve bolts of the clamp type are generally relatively long, and under high temperature conditions, the bolt may cause leakage after expansion, so it is not suitable for large pipe diameters under high temperature conditions.

Moreover, the clamp-type butterfly valve generally cannot be used at the end of the pipeline and the downstream occasions that need to be disassembled, because when the downstream flange is removed, the clamp-type valve will fall down, and in this case, it is necessary to make a short section in order to disassemble it, and the flanged butterfly valve does not have the above problems, but the cost will be relatively high.

There are no flanges at both ends of the clamp butterfly valve body, only a few guide bolt holes, and the valve is connected with the flange of the end with a set of bolt nuts.

In contrast, it is easier to disassemble, and the cost of the valve is lower, but the disadvantage is that there is a problem with the sealing surface, and both sealing surfaces have to be disassembled.

There are flanges at both ends of the flanged butterfly valve body, which are connected with the pipe flanges. The seal is relatively more reliable, but the cost of the valve is relatively high.

The turbine can open and close the valve very lightly, which is more labor-saving, and reliable to close and open in place, manually, it is relatively laborious to open and close, but the manual action is very fast. The switch is swift. Generally, large-caliber turbines are used.

1. The length of DN150 to the butterfly valve is specified in GB T12221 and has two lengths, one is 56 and the other is 70. The bolt also depends on the nominal pressure, the thickness of the two corresponding nuts + the thickness of the two flanges + the length of the valve structure + the thickness of the two gaskets + the margin (about three threads).

2. Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, which can be used for the on-off control of low-pressure pipeline medium, and the butterfly valve refers to a kind of valve that is rotated around the valve shaft to achieve opening and closing, and the valve 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. It mainly plays the role of cutting and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting.

If you want to repair the manual turbine butterfly valve, it is recommended that you find a professional technician to operate it, so as not to cause secondary damage to the butterfly valve itself. Zibo Weiheng valve does the maintenance work of manual turbine butterfly valve.

Disassembling is actually very simple, the valve body itself has bolts, loosen it and gently tap to open it, the valve body itself and the manual turbine device are not one, can be disassembled.

I don't know what the song you mean by demolition! Is it to remove the valve from the pipe?

This is a turbine-to-clamp butterfly valve, is it difficult to make trouble? The flange is dedicated to butterfly valves, and the screws are made of high strength, and the installation principle is the same as that of the valve.

This is a double-clamp soft-seal butterfly valve, and the two flanges of the two pipes clamp the butterfly valve in the middle.

This is a clamp-on eccentric butterfly valve, welded with the special flange of the butterfly valve at both ends of the pipeline (the nominal pressure level of the flange and the nominal pressure level of the butterfly valve should be the same), and then the bolt is passed through the 4 ear holes of the butterfly valve, fixed on the flange, and fixed with bolts on both sides. If shown.

Requirements for the installation of butterfly valves with clamp-on handles

1.Before the installation of the clamp-type handle butterfly valve, it should not be discarded at will, and it should be placed in a cool, dry and ventilated environment, and should be covered well to avoid the valve being contaminated with dust and other sundries, which will affect the later use.

2.Before installing on the pipeline, the pipeline should be calibrated first, and the position of the pipeline at both ends should be consistent, and there should be no deviation, otherwise if the manual butterfly valve is installed in the case of deviation from the pipeline, it will cause tension or rupture of the valve body.

3.In addition to the correction of the pipeline, there is also a preparation before installation, which is to clean the clamp-handle butterfly valve and its pipeline to be installed to ensure the cleanliness of the valve and the pipeline, otherwise the sealing effect of the valve will be affected.

4.Butterfly valves with clamp handles require frequent manual operation. Therefore, the installation position of the clamp handle butterfly valve is also very particular, the valve installation position must be convenient for personnel to operate and maintain in the future, and it is demonstrated that the best position for manual valve installation is about the operation floor.

For valves installed outdoors, cover the valves with some covering to prevent bad weather from affecting the valves.

5.When installing, the butterfly plate of the butterfly valve with the clamp handle must be closed, so as to avoid collision damage between the butterfly plate and the pipeline flange, which will affect the sealing performance.

6.After the installation is completed, it is necessary to debug, if in the process of use, the clamp handle butterfly valve has a failure to open and close, to find out the reason, eliminate the fault, can not be forced to open and close by knocking, prying or brute force.

Can be installed vertically or horizontally.

Thoroughly remove debris from the pipeline before installation, and thoroughly flush the pipeline and valve cavity.

In the case of a soft-seal butterfly valve, be careful not to damage the rubber ring when placing the valve between the two flanges.

Haha, you ask others can't help it, the butterfly valve is too big, the flange butterfly valve is now someone can do 5 meters, how big the pipe diameter depends on how much flow you need to determine.