Pneumatic hard seal ball valve

　　Overview of Pneumatic Hard Seal Ball Valve Products

Q641H pneumatic hard seal ball valve is suitable for two position cut-off and adjustment applications. The connection between the ball valve and the actuator adopts a direct connection method. Pneumatic metal sealed ball valves are mainly suitable for working conditions with temperatures above 250 degrees Celsius. Pneumatic metal sealed ball valves are mainly divided into two sealing structures: one-way sealing and two-way sealing; Unidirectional sealing: can only seal in the specified direction indicated by the ball valve; Bidirectional sealing: capable of sealing in both directions; The structural forms of pneumatic hard seal ball valves are divided into floating ball type and fixed ball type; The connection forms include flange connection, welding connection, and threaded connection. Paired with an electrical valve positioner, it can control operation by inputting a 4-20mADC signal and a 0.4-0.7MPa gas source, achieving adjustments to parameters such as pressure, flow rate, temperature, and liquid level. It is also equipped with a travel limit switch, solenoid valve, pressure reducing valve, and 0.4-0.7MPa gas source to achieve switch operation, and sends two pairs of passive contact signals to indicate the switch of the valve. Pneumatic hard sealed ball valves have the advantages of simple wiring, compact structure, small size, light weight, low resistance, stable and reliable operation, etc. Pneumatic hard seal ball valves are widely used in the mining, refining, processing, and pipeline transportation systems of oil, natural gas, coal, and ore; In the production of chemical products, pharmaceuticals, and food; In the power production systems of hydropower, thermal power, and nuclear power; In the water supply and drainage, heating, and gas supply systems of cities and industrial enterprises.

　　Pneumatic hard seal ball valve product features

1. The flexible movable metal valve seat structure with cylindrical spring or waveform spring preloading is adopted, and the sealing preload force is designed reasonably and the opening and closing are flexible, effectively ensuring the reliability of the seal.

2. The valve stem with a special structural device not only ensures that there will be leakage at the filling point, but also prevents the valve stem from coming out.

3. According to user needs, the structure can be designed to adapt to media such as dust (including solid particles) and slurry, making the ball valve more wear-resistant and heat-resistant.

4. It has fire and static electricity prevention functions.

5. Pneumatic metal sealed ball valves should be used according to the specified flow direction.

　　Working principle of pneumatic hard seal ball valve

The working principle of pneumatic hard seal ball valve is to rotate the valve to make the valve unobstructed or blocked. Pneumatic ball valve switches are lightweight, small in size, can be made into large diameters, reliable in sealing, simple in structure, easy to maintain, and the sealing surface and spherical surface are often in a closed state, which is not easily eroded by the medium. They are widely used in various industries.

Pneumatic fixed ball valves and plug valves belong to the same type of valve, except that their closing element is a sphere that rotates around the centerline of the valve body to achieve opening and closing.

Pneumatic fixed ball valves are mainly used in pipelines for fast cutting speed, distribution, and changing the flow direction of media.

Pneumatic ball valve is a new type of valve widely used in recent years, which has the following advantages:

1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe segment of the same length.

2. Simple structure, small size, and light weight.

3. Tight and reliable, plastic is widely used as the sealing surface material for ball valves with good sealing performance, and it has also been widely used in vacuum systems.

4. Easy to operate, quick opening and closing, only need to rotate 90 ° from fully open to fully closed, making it convenient for remote control.

5. Easy to maintain, the pneumatic ball valve has a simple structure, and the sealing ring is generally movable, making disassembly and replacement relatively convenient.

6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, it will not cause erosion of the valve sealing surface.

7. Widely applicable, with diameters ranging from a few millimeters to several meters, suitable for applications from high vacuum to high pressure. Pneumatic fixed ball valves have been widely used in various sectors such as petroleum, chemical, power generation, papermaking, atomic energy, aviation, rockets, and people's daily lives.