Fixed high-pressure ball valve

The Q347H fixed high-pressure ball valve is a high-performance industrial valve specially designed for critical pipelines with large diameters and high pressures. This valve adopts a sturdy and reliable flange connection method, and its core driving mechanism is a worm gear transmission, which enables smooth, effortless, and precise opening and closing control. It is particularly suitable for large-diameter valves that require a large operating torque. The valve body is made of high-strength A105 forged steel, ensuring the overall structural strength and pressure-bearing capacity. 

Its most distinctive structural feature is the adoption of a "fixed-type" spherical design, where the sphere is fixed by upper and lower valve rods, and there is no floating displacement during operation. This enables the valve to have higher structural stability and a longer service life under high pressure. The nominal diameter of this valve reaches 24 inches (approximately DN600), with a pressure rating of 600LB, and it can operate stably under high-pressure and large-diameter conditions. 

Its sealing system adopts advanced metal-to-metal sealing pairs and achieves double-sided sealing, ensuring zero leakage sealing within a wide temperature range of -40℃ to 425℃. Besides being applicable to conventional media such as water, oil, steam, and natural gas, its sturdy fixed structure and metal sealing design also enable it to effectively handle complex media containing particles, powders, fibers, etc., with strong anti-corrosion ability. 

Therefore, the Q347H fixed high-pressure ball valve is a key equipment used in the fields of natural gas long-distance pipelines, liquefied gas storage and transportation terminals, petrochemical plants, large power plants and power stations, for cutting off, connecting and regulating control of the medium in large-diameter main pipelines.

1. The fixed structure ensures extremely high stability under high-pressure and large-diameter working conditions. 

Unlike the floating ball valve, the fixed ball is rigidly supported by the upper and lower valve stems and will not move under the pressure of the medium. This design completely eliminates the possible drift of the ball under high pressure, significantly reduces the uneven wear of the valve seat, and makes the valve particularly suitable for long-term stable operation on critical pipelines with a 24-inch diameter and a 600LB high pressure rating. It possesses extremely high structural rigidity and operational stability. 

2. The worm gear drive enables smooth and precise control of large-diameter valves. 

Due to the large torque required for the opening and closing of large-diameter valves, a worm gear drive device is adopted. This device has a remarkable effect of reducing speed and increasing torque, making the manual operation more effortless and smooth. The worm gear transmission itself has a self-locking function, which can ensure that the valve remains at any intermediate opening position, enabling precise regulation of the fluid and preventing valve position changes due to pressure shock of the medium, with high control accuracy. 

3. The metal hard seal and double-sided seal ensure absolute sealing performance. 

The valve adopts a metal seal (hard seal) and double-sided sealing design. The metal seal pair is resistant to high temperatures, wear and erosion. In harsh working conditions such as high pressure, high temperature and those containing solid particles, its sealing performance is much better than that of soft seals. The double-sided sealing structure provides dual guarantees and further enhances the reliability of the seal, especially suitable for dangerous media such as natural gas and liquefied gas that have an absolute zero leakage requirement for sealing. 

4. Outstanding adaptability to working conditions and media processing capabilities 

This valve has a wide operating temperature range from -40℃ to 425℃, capable of withstanding both extreme cold and high temperatures. Its sturdy fixed flow channel and metal sealing surface design is not only suitable for clean fluids, but also capable of effectively handling complex media containing particles, powders, and even fibers, preventing seal failure caused by impurities getting stuck or being washed away, thereby expanding its application scope in fields such as petroleum, chemical engineering, and mining. 

5. The forged steel valve body is connected to the large-diameter flange to ensure the safety of the system. 

The valve body is made of A105 forged steel, which is dense in material, has high strength and good toughness. It provides fundamental safety guarantees for large-diameter high-pressure valves. Combined with standard flange connections, it is installed stably and has a large sealing surface. It can ensure the long-term safe and reliable operation of the valve and the pipeline system under high-pressure and vibration conditions. It is an indispensable key shut-off equipment in large-scale energy and heavy industry installations.