Structure and characteristics of pneumatic three-way ball valve:
1. Compact structure, quick opening and closing, smooth flow path, and low fluid resistance.
2. Excellent sealing performance: Achieves leak-proof sealing with the use of four-way valve seat material, polytetra elastic deformation.
3. Multi-functional Valve: Any port can be used without leakage; the three-way valve can be made into an L-shaped port or a T-shaped port.
4. Easy Maintenance: Inspection and repair can be conducted without removing the entire valve body after the system is depressurized.
5. Versatile for switching flow direction and for diverting or mixing fluids in piping systems across industries such as water supply, petrochemical, metallurgy, mining, light industry, energy, papermaking, food, and steel.
6. Low fluid resistance, with a drag coefficient equal to that of a pipe section of the same length.
7. Simple structure, compact size, and light weight.
8. Tightly reliable, plastic is widely used as the sealing material for ball valves due to its good sealing properties, and they are also extensively utilized in vacuum systems.
9. Easy to operate, quick to open and close; it takes only a 90° rotation from fully open to fully closed, making it convenient for long-distance control. 10. Easy to maintain; the ball valve structure is simple, and the seals are generally movable, making disassembly and replacement straightforward.
11. When fully open or closed, the sealing surface of the ball and valve seat is isolated from the medium. During passage of the medium, it causes erosion of the气动三通球阀 sealing surface.
12. Wide application range, from a few millimeters to several meters in diameter, suitable for high vacuum pressure as well.
13. The three-way ball valve features an integrated structure, a sealing type with four valve seats, minimal flange connections, high reliability, and a lightweight design.
14. Ball valves are divided into two types based on their operation: single-acting and double-acting. The characteristic of the single-acting type is that the valve will remain in the state required by the control system in case of a power source failure.
What are the reasons for the high reliability of pneumatic three-way ball valves?
(1) The ball and valve seat sealing pair experiences wear, rapid abrasion, and other malfunctions, which may become stuck during operation (without lubricant), hence it can be reliably applied in corrosive mediums and low-boiling point liquids.
(2) Internally mounted valve stem structure eliminates the potential accident隐患 of the valve stem flying out due to the loosening of the packing cover under fluid pressure.
(3) The pneumatic three-way ball valve with anti-static and fire-resistant structure is suitable for pipeline transportation of oil and gas.
(4) The valve body channel is smooth and even, making it more suitable for conveying viscous fluids, slurry, and solid particles.
(5) Due to its resistance to sticking during operation (especially without lubricant), it can reliably be used with corrosive media and low-boiling point liquids.
(6) The spherical shut-off plug can automatically locate in position and withstand high pressure differentials during closure.
(7) Achieves full bidirectional sealing over a wide range of pressures and temperatures.
(8) When fully open and fully closed, the sealing surfaces of the sphere and valve seat are isolated from the medium, thus preventing erosion of the sealing surfaces by the medium passing through the valve at high speed.
(9) The pneumatic three-way ball valve features a compact structure and light weight, making it a reasonable valve design for low-temperature medium systems.
(10) The valve body is symmetrical, especially in the case of welded valve body structures, which can effectively withstand stresses from the pipeline.
(11) Full-welded body pneumatic three-way ball valves, suitable for direct burial underground, ensuring valve internals are immune to erosion, with a long service life of up to 30 years—ideal for oil and gas pipeline valves.
Pneumatic three-way ball valve stem anti-leakage design
1. The valve rod features a blow-out prevention design.
2. *Stage-sealed, the conical valve stem seal effectively prevents leakage of the medium during the rotation of the valve stem, and also effectively prevents leakage under abnormal overpressure conditions.
3. In the second stage of sealing, a set of V-shaped packing is compressed and expands to both sides, thereby preventing leakage.
4. Automatically compensates for the wear on packing and valve stem seal by releasing the pre-tensioned compression force of the disc spring.
5. The pneumatic three-way ball valve employs a valve rod nut to securely tighten the entire valve rod sealing system, preventing leaks.