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What is the working principle of a threaded check valve?

2021-12-22

What is the working principle of a threaded check valve?

A threaded check valve is a valve that automatically opens and closes the valve disc according to the flow rate of the medium itself to prevent backflow of the medium. It is also known as a check valve, one-way valve, non-return valve, or back pressure valve. A threaded check valve is an automatic valve whose main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and prevent the discharge of the medium in the container. Threaded check valves can also be used to supply gas to auxiliary systems where the pressure may be higher than the system pressure. Threaded check valves can be divided into swing check valves and lift check valves (moving along the axis). The function of this type of valve is to allow the medium to flow in only one direction and prevent flow in the opposite direction. This type of valve usually works automatically. Under the action of the fluid pressure in the unidirectional flow, the valve disc opens; when the fluid flows in the reverse direction, the fluid pressure and the self-weight of the valve disc act on the valve seat, thus cutting off the flow.

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Advantages and disadvantages of several types of valves

2021-12-22

Advantages and disadvantages of several types of valves

A gate valve is a valve in which the closing member (gate) moves perpendicular to the flow axis. It is mainly used to shut off the medium in the pipeline, i.e., fully open or fully closed. Generally, gate valves cannot be used to regulate flow. They can be used for low-temperature and low-pressure or high-temperature and high-pressure applications, and the material of the valve can vary. However, gate valves are generally not used in pipelines transporting media such as slurry.

Working principle and fault analysis of pneumatic valves

2021-12-22

Working principle and fault analysis of pneumatic valves

A pneumatic valve uses a pneumatic cylinder as its actuator and compressed air as its power source to control the opening and closing of the valve. When the control system sends a control signal to the regulating pipeline, it adjusts relevant parameters such as temperature, pressure, and flow rate. In general, pneumatic valves are characterized by their reliability, fast response, and simple control. During operation, when a signal pressure of 0.02-0.10 MPa is input to the regulating chamber, the diaphragm generates a thrust. As the thrust plate moves downward, the spring is compressed, thereby actuating the valve stem, push rod, and valve core to move downward, achieving the purpose of regulating the valve.

How to correctly select an electric ball valve

2021-12-22

How to correctly select an electric ball valve

Reports indicate that over 20,000 kilometers of oil pipelines are planned for construction in China over the next 10 years, including cross-border pipelines from Russia and Kazakhstan. In addition, following the "West-to-East Gas Transmission" project, China plans to build over 20,000 kilometers of cross-border gas pipelines and branch lines.

How to choose a good electric ball valve

2021-12-22

How to choose a good electric ball valve

In the current market economy, simply specifying the specifications, category, and pressure of electric ball valves to meet procurement requirements is insufficient. To enhance product competitiveness, manufacturers of electric ball valves have made various innovations based on the concept of unified design, resulting in their own enterprise standards and product individuality. Therefore, it is necessary to specify detailed technical requirements when purchasing electric ball valves and reach a consensus with the manufacturer. Including this as an attachment to the electric ball valve purchase contract is essential.

Advantages and disadvantages of pneumatic and electric valves

2021-12-22

Advantages and disadvantages of pneumatic and electric valves

The pneumatic valve has a larger operating torque than the electric valve. The opening and closing speed of the pneumatic valve is adjustable. It has a simple structure and is easy to maintain. Due to the buffering characteristics of the gas itself, it is not easy to be damaged by jamming during operation. It requires a gas source, and its control system is more complex than that of an electric valve.

Advantages of electric valves over traditional valves

2021-12-22

Advantages of electric valves over traditional valves

In terms of operational efficiency and energy saving, the use of automatic control valves is indispensable. Manually operated and pneumatic valves commonly used in traditional industries are inferior to electric valves in terms of installation cost and efficiency.

Advantages of electric valves over traditional valves

2021-12-22

Advantages of electric valves over traditional valves

If there is a slight leak at the packing gland, retighten the gland nut. However, do not overtighten it; usually 1/4 to 1 turn will stop the leak.

Briefly describe the classification and structure of ball valves

2021-12-22

Briefly describe the classification and structure of ball valves

Ball valves are classified into: floating ball valves, fixed ball valves, trunnion ball valves, V-ball valves, three-way ball valves, stainless steel ball valves, cast steel ball valves, forged steel ball valves, ash discharge ball valves, sulfur-resistant ball valves, pneumatic ball valves, electric ball valves, compression ball valves, and welded ball valves.

Several types of valve products in our country

2021-12-22

Several types of valve products in our country

There are more than 2,300 valve manufacturing companies in the domestic market, offering several major categories, more than 3,500 varieties, and more than 40,000 specifications of valve products. Let's introduce the classification of valves below!