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2024-09-30

What is the difference between a clamp butterfly valve and a flange butterfly valve?

Clamp butterfly valve and flange butterfly valve are two common types of butterfly valves. The scope of application of the two butterfly valves is very wide, but many friends can't tell the difference between the clamp butterfly valve and the flange butterfly valve, and they don't know the difference between the two. The clamp and flange of the butterfly valve are two connection methods. In terms of price, it is relatively cheaper for the clamp type...

2024-09-30

Analysis of the whole process of valve maintenance: key steps to restore safety and efficiency

The general procedure of valve maintenance is a systematic and meticulous process to ensure that the valve can return to normal operation and meet the requirements of safety and reliability. The following are the general procedures for valve maintenance according to multiple sources:

2024-09-30

Three eccentric valves: zero leakage, long-life fluid control expert

The three eccentricity of the three eccentric valves are: axis eccentricity, spherical eccentricity and sealing surface eccentricity. Three eccentricity (1) The offset of the valve plate relative to the center of the valve body; (2) The offset of the valve shaft relative to the center line of the valve body; (3) The center line of the valve shaft is offset against the shaft at the cone angle of the seat.

2024-09-30

What are the types and classifications of ball valves?

A ball valve is a valve with a ball as the closed member. It is mainly composed of a valve body, valve seat, ball body, stem, handle (or other driving device, such as electric actuator, pneumatic actuator or hydraulic actuator). The stem rotates around the axis of the ball valve. It is mainly used to cut, distribute and change the direction of media in the pipeline. Multiple flange ball valve Q41F has been provided, which is widely used in major urban factories in China and exported to the international market.

2024-09-30

How does the ball valve work?

The ball valve is a ball driven by the valve stem as an opening and closing part, and the valve rotates around the axis of the ball valve, which can be used for fluid regulation and control. Ball valves came out in the 1950s and have now become the most widely used valves.

2024-09-30

Technical requirements for valve installation

In the fluid system, the valve is a device used to control the direction, pressure and flow of the fluid. During the construction process, the quality of valve installation directly affects the normal operation in the future, so it must be highly valued by construction units and production units.

2024-09-30

Causes and preventive measures of valve stem breakage in industrial production

In industrial production, valve stem fracture is a problem that cannot be ignored. Valve stem fracture generally occurs at the root of the upper and lower threads, where the cross-sectional area is the smallest, and it is prone to stress concentration and exceeding the standard. Especially when the working conditions deviate significantly from the design parameters, for example, a power plant has repeatedly broken the valve stem trapezoid thread return groove after the DN150 electric gate valve is opened.

2024-09-30

Full analysis of butterfly valve material selection

The material selection of the butterfly valve mainly depends on its use environment and media characteristics. The following is a detailed analysis of the material selection of the main components of the butterfly valve (body, valve plate, valve seat): 1. Valve body material Cast iron: including gray cast iron (CI) and ductile cast iron (DI). Gray cast iron butterfly valve is the most common one. It is mainly used in water systems, but it is easy to rust, has a relatively short service life and is cheap. The performance of ductile cast iron butterfly valve is comparable to that of carbon steel. It is generally used in water system pipelines, and it is also a material widely used in water systems at present.

2024-09-30

Characteristics and technical parameters of the clamp check valve

The clamp check valve is also known as counterflow valve, check valve, back pressure valve and one-way valve. This kind of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which is a kind of automatic valve. The clamp check valve is suitable for various pipelines with nominal pressure PN1.0MPa~42.0MPa, Class150~2500; nominal diameter DN12~1200mm, NPS1/2~48; working temperature -196~540℃, and is used to prevent the backflow of the medium. By selecting different materials, it can be used for a variety of media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea.

2024-09-30

Advantages and disadvantages and scope of application of ball valves

Because ball valves usually use rubber, nylon and polytetrafluoroethylene as seat sealing ring materials, its use temperature is limited by the seat sealing ring material. The cut-off effect of the ball valve is achieved by the metal sphere pressing each other between the plastic valve seat under the action of the medium (floating ball ball valve). Under the action of a certain contact pressure, the valve seat sealing ring undergoes elastic plastic deformation in local areas.

2024-09-30

What is the medium temperature applicable to different valve bodies and valve cover materials?

The medium temperature applicable to different valve bodies and cover materials is also different. Understanding these can the valve selection correctly and reduce unnecessary losses. Guowei Valve introduces some commonly used media temperatures for valve bodies and cover materials!

2024-09-30

Structural characteristics of gate valve

The gate valve is a cut-off valve, and its sealing performance is not as good as that of the shut-off valve. The main "responsibility" of the gate valve is to "cut off the flow" and minimize the resistance. When the gate valve is fully open, the whole flow channel is through. At this time, the pressure loss of the medium is the least. Its main advantage is that the fluid flow resistance is small. The flow resistance coefficient of ordinary gate valves is about 0.08~0.12. The gate valve is usually suitable for conditions that do not need to be opened and closed frequently, and the gate is kept fully open or closed, which is not suitable for adjustment. If it is used for long-term adjustment, the sealing surface is easy to be washed and worn by the medium, which will affect the sealing performance.