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2025-06-14

Working principle and characteristics of pneumatic high-performance ball valve

Pneumatic high-performance ball valves use compressed air as the power source and achieve rapid opening and closing and precise control of the valve through pneumatic actuators. They have the characteristics of high pressure bearing capacity, high-precision control, high reliability, and simple maintenance, as follows: Working principle The working principle of pneumatic high-performance ball valves is based on compressed air drive. The gas source generates a force through the pneumatic actuator, pushing the valve core of the ball valve to achieve opening and closing operations. Specifically, when the pneumatic actuator receives a control signal, compressed air enters the cylinder and drives the piston to move. The movement of the piston drives the valve stem to rotate, and the rotation of the valve stem is transmitted to the ball valve through the gearbox (or fork mechanism), causing the ball to rotate around the axis perpendicular to the channel

2025-06-14

Precautions for installation of large-diameter fully welded ball valves

When installing large-diameter fully welded ball valves, attention should be paid to key aspects such as pipeline pretreatment, lifting operations, welding specifications, and subsequent inspection and maintenance. The specific steps are as follows: 1. Pipeline inspection and pre-treatment: Before installation, it is necessary to ensure that the interior of the pipeline is clean, free of impurities, rust, etc., to prevent foreign objects from entering the valve. At the same time, it is necessary to check the size and positional errors of the pipeline to ensure that it matches the connection port of the ball valve. 2. Valve lifting: The lifting rope should be tied to the lifting ear (ring) or flange on the valve body of the ball valve, avoiding tying it to the handwheel

2025-06-14

What are the characteristics of fixed ball valves

Fixed ball valves have the following significant characteristics, which make them widely advantageous in industrial applications: 1. Sturdy structure and strong pressure bearing capacity Spherical fixed design: The spherical body is supported and fixed by upper and lower valve stems, without displacement due to medium pressure, ensuring structural stability under high pressure conditions. High strength materials: Valve bodies and spheres are usually made of high-strength materials such as carbon steel, stainless steel, or alloy steel, which can withstand pressures of hundreds of megapascals (MPa) and are suitable for high-pressure, large-diameter pipeline systems. 2. Excellent sealing performance

2025-06-14

What factors affect the practical application of fully welded ball valves?

Fully welded ball valves are affected by various factors in practical applications, which directly affect the performance, service life, and safety of the ball valve. Here are some of the main influencing factors: 1. Medium conditions • Medium temperature: The medium temperature for fully welded ball valves is generally between -20 ℃ and 150 ℃. Exceeding this range may affect the sealing performance and material stability of the ball valve. • Medium composition: If the medium contains hard particles, crystals, impurities, etc., it is easy to wear out the fluorine lining or PTFE bellows of the valve core and seat during the opening and closing process, resulting in leakage. • Medium pressure: Fully welded ball valves need to withstand a certain amount of medium pressure. If the pressure is too high or fluctuates too much, it may cause damage to the structure of the ball valve or affect the sealing effect. 2. Materials and Sealing

2024-09-30

Installation environment and maintenance precautions for pneumatic butterfly valves

Pneumatic butterfly valves, as a widely used valve in industrial fluid control systems, have a significant impact on the normal operation and service life of the valve due to their installation environment and maintenance precautions. The following is a detailed explanation: 1、 Installation environment 1. Temperature and humidity The installation environment temperature of pneumatic butterfly valves should generally be between -20 ℃ and+70 ℃, and the humidity should be below 90% RH. Under extreme temperature or humidity conditions, it is necessary to choose suitable materials or take protective measures to prevent valve performance degradation or damage due to environmental factors. 2. Corrosive medium If corrosive media are present in the installation environment, corrosion-resistant materials or coatings should be selected to prevent the valve from being corroded. Under special working conditions, it is recommended to consult the valve manufacturer and choose the appropriate material combination.

2024-09-30

Why is it necessary to specify a sealing device for gate valves and globe valves

Gate valves and globe valves are required to have upper sealing devices, mainly based on the following considerations: 1、 Prevent medium leakage and protect the filling material Prevent medium leakage: When the gate valve and globe valve are closed, the valve stem is in a stationary position. If there is no upper sealing device, the medium may penetrate upwards along the gap between the valve stem and the valve body, causing the medium to leak out. The upper sealing device can effectively prevent medium leakage, ensuring the working performance and safety of the valve. Packing protection: The packing box is usually sealed with flexible materials such as asbestos, polytetrafluoroethylene, etc., which are prone to corrosion, aging, and damage from long-term contact with the medium. The upper sealing device can prevent the medium from entering the packing box, providing protection for the packing and extending its lifespan