Introduction to telescopic butterfly valves, the telescopic joints of telescopic butterfly valves sh

The characteristics of the new high-life stainless steel butterfly valve and the problems that the butterfly valve has during use.

At present, as a component used to realize the on-off and flow control of pipeline system, telescopic butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. In the well-known butterfly valve technology, its sealing form is mostly a sealing structure, and the sealing materials are rubber, PTFE, etc. Due to the limitation of structural characteristics, it is not suitable for high temperature resistance, high pressure resistance, corrosion resistance, wear resistance and other industries.

At present, a relatively advanced butterfly valve is a three-eccentric metal hard seal butterfly valve, the valve body and the valve seat are conjoined components, and the surface layer of the valve seat seal is welded with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft-stacked sealing ring is fixed on the valve plate, this butterfly valve has high temperature resistance, light operation, no friction in opening and closing, and compensates for the sealing with the increase of the torque of the transmission mechanism when closing, which improves the sealing performance of the butterfly valve and prolongs the service life.

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 telescopic butterfly valve is a combination of the telescopic device and the butterfly valve, which is generally assembled by the manufacturer and does not need to be reassembled by the construction party. If the expansion joint is simply connected with the butterfly valve, there should be the following situations: 1. When the midline butterfly valve or the clamp butterfly valve and the expansion joint are connected, the front or rear can be installed arbitrarily, but the diameter of the expansion joint must be greater than the diameter of the butterfly valve plate, otherwise the butterfly valve cannot be fully opened.

2. If the eccentric butterfly valve is purely connected with the telescopic restrictor, it is recommended to connect the hole on one side of the expansion joint mouth with the farther side of the eccentric butterfly valve valve plate to prevent the butterfly valve from being completely opened. It should be noted that after the expansion joint is installed, it is necessary to tighten the bolt of the expansion joint pressure plate again with diagonal hair to prevent the expansion joint pressure plate from leaking water vertically.

The telescopic butterfly valve has the characteristics of compact structure, small size, light weight, low raw material loss, small stool size, fast power switch, 90° reciprocating rotation, small driving torque, etc., which is used to disconnect, access and adjust the material in the pipeline, and has good fluid control characteristics and closing sealing characteristics. When the telescopic butterfly valve is in the open position, the thickness of the telescopic butterfly touching the crude eggplant valve is the frictional resistance when the medium flows through the oil circuit plate, so the gas pressure formed through the valve is not large, so it has a strong flow monitoring characteristic. Elastic sealing valve, the sealing ring can be embedded in the oil circuit plate and near the attached butterfly plate.

The telescopic butterfly valve is made of metal and the valve is generally longer than the elastic sealed valve, but it is difficult to seal. Metal seals are adapted to relatively high operating temperatures, while elastic seals are limited by air temperature.

I think the expansion joint should be installed behind the valve.

Generally, it is placed at the outlet end of the butterfly valve, which is the back of what you said!

As a component used to realize the on-off and flow control of pipeline system, telescopic butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. The butterfly plate of the telescopic butterfly valve is installed in the diameter direction of the pipe. 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.

This valve is generally installed horizontally.

The telescopic butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, fast switch, 90° reciprocating rotation, small driving torque, etc., and is used to cut, turn on and adjust the medium in the pipeline, and has good fluid control characteristics and closing sealing performance. When the telescopic butterfly valve is in the fully open position, the thickness of the telescopic butterfly valve is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. There are two types of seals: elastic seal and metal seal.

Elastomeric seal valves, the sealing ring can be embedded in the valve body or attached to the perimeter of the butterfly plate.

Telescopic butterfly valves with metal seals generally have a longer life than elastomeric valves, but it is difficult to achieve a complete seal. Metal seals can accommodate higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature. If telescopic butterfly valves are required to be used for flow control, the main thing is to choose the correct size and type of valve.

The structural principle of telescopic butterfly valves is particularly suitable for the production of large-diameter valves. Telescopic butterfly valves are 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 stations.

There are three commonly used telescopic butterfly valves: clamp butterfly valve, flange butterfly valve and butt-welded butterfly valve. The clamp butterfly valve is to connect the valve between the two pipe flanges with stud bolts; Flanged butterfly valve is a valve with a flange, and the flanges at both ends of the valve are connected to the pipeline flange with bolts; The two ends of the butt welded butterfly valve are welded with the pipeline. The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.

The valve stem is a through-rod structure, which has been quenched and tempered, and has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not lift and fall, and the packing of the valve stem is not easy to be damaged, and the sealing is reliable. It is fixed with the butterfly plate taper pin, and the overhanging end is designed to prevent the valve stem from falling out when the connection between the valve stem and the butterfly plate is accidentally broken.

1. Small and lightweight, easy to disassemble and maintain, and can be installed in any position.

2. The structure is simple and compact, the operating torque is small, and the 90-degree rotation opens quickly.

3. The flow characteristics tend to be straight, and the adjustment performance is good.

4. The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes the possible internal leakage point.

5. The seals are replaceable, and the sealing is reliable to achieve two-way sealing.

6. The butterfly board can be sprayed according to user requirements, such as nylon or PTFE.

7. The valve can be designed as a flange connection and a clamp connection.

8. The driving mode can be manual, electric or pneumatic.