Q347H stainless steel high-pressure three piece fixed forged steel ball valve

Product Overview

The Q347H stainless steel high-pressure three piece fixed forged steel ball valve adopts forging and forging processing technology to improve density, and the hardening technology of the ball and valve seat, including supersonic spraying, nickel based spray welding, special surface hardening, hard alloy spray welding, and the use of high-strength and high hardness ceramic materials. The surface hardness of the ball and valve seat can generally reach HRC60 or above, and can reach HRC74 or above. The sealing surface material can withstand temperatures up to 540 ℃ and 980 ℃, and the bonding strength of the material can reach 10000 PSI or above. The sealing surface material also has good impact resistance and other properties. Metal hard sealed ball valves are suitable for the vast majority of harsh working conditions.

Mainly used for long-distance pipeline transportation of oil and natural gas, as well as urban gas pipeline systems. Due to the unique characteristics of valves used in long-distance pipelines, their ability to withstand pipeline stress, as well as safety, weather resistance, and long-term reliability, were fully considered in the design; Suitable for long-distance pipelines and general industrial pipelines with Class 150-2500Lb and working temperature of 80-550, special considerations have been made for their safety and resistance to harsh environments. They are suitable for media such as water, oil, steam, gas, and natural gas.

Performance Characteristics

• Effortless operation: The ball is supported by upper and lower bearings, reducing friction and eliminating excessive torque caused by the huge sealing load formed by the inlet pressure pushing the ball and the sealing seat.
• Reliable sealing performance: The PTFE single sex material sealing ring is embedded in the stainless steel valve seat, and the metal valve seat end is equipped with a spring to ensure sufficient pre tightening force of the sealing ring. When the sealing surface of the valve wears out during use, the valve continues to ensure good sealing performance under the action of the spring.
• Fireproof structure: In order to prevent the PTFE sealing ring from burning out due to sudden heat or fire, causing significant leakage and fueling the fire, a fireproof sealing ring is installed between the sphere and the valve seat. When the sealing ring burns out, the valve seat sealing ring is quickly pushed onto the sphere by the spring force, forming a metal to metal seal and achieving a certain degree of sealing effect. The fire resistance test meets the requirements of APl6FA and APl607 standards.
• Automatic pressure relief function: When the pressure of the stagnant medium in the valve chamber abnormally increases beyond the preload force of the spring, the valve seat will retract and detach from the ball, achieving the effect of automatic pressure relief. After pressure relief, the valve seat will automatically reset.
• Drain pipeline: Drain plugs L are installed on both the upper and lower parts of the valve body to check if there is any leakage in the valve seat. During operation, when the valve is fully open or fully closed, the pressure in the middle chamber can be relieved and the packing can be directly replaced; It can discharge the retained substances in the middle chamber and reduce the pollution of the medium to the valve. Auxiliary sealing setting system (please specify when ordering)
• This valve is designed with an auxiliary seat emergency sealing system. Once the seal is damaged or an emergency situation occurs and cannot be sealed, the corresponding sealing agent can be injected into the sealing surface through the auxiliary sealing system to repair the sealing surface and achieve emergency sealing. When the conveyed medium is unclean or contains a small amount of particles, in order to protect the sealing surface and ensure reliable sealing, corresponding cleaning agents or lubricants can be injected into this device to clean the sealing surface.