Forged Steel High-Temperature Hard Seal Ball Valve

Product Range

Applicable Working Conditions

This ball valve is specially designed for the core section of the polysilicon production line—the inlet and outlet of the cold hydrogenation reactor kettle, mainly to cope with the extremely harsh conditions of this section: high temperature and high pressure (with a maximum operating temperature of 560℃), high flow rate, high erosion, and gas-solid two-phase medium containing micron-sized high-hardness silicon powder. Considering economy and practicality, the body materials mainly include high carbon austenitic stainless steel series: F304H, F316H; nickel-based alloys: NO8810, etc.

Product Features

▶ Excellent Performance: 

① The sealing surfaces of the valve seat and ball are coated with wear-resistant hard alloy, with coating hardness ≥ HRC70, bonding strength ≥ 100MPa, porosity ≤ 0.1%, and perfectly matched by grinding to achieve a mirror surface finish. This ensures wear resistance, erosion resistance, high temperature resistance, and reliable sealing performance under harsh conditions.

② The design fully considers the linear expansion coefficients of each component at different temperatures, using a new elastic preloaded valve seat assembly and dust-proof design. The sealing surface adopts a scraper design to effectively prevent valve jamming under any working condition, ensuring stable operation performance under high and low temperature cycles;

③ The valve flow path and the end flange surfaces prone to erosion by the medium use high-hardness pure hard alloy wear-resistant liner structures, enhancing the valve’s erosion resistance under high flow rate, high erosion, and high-hardness silicon powder media. The service life is more than four times that of similar products of the same specification, reducing maintenance frequency and improving polysilicon production efficiency.

▶ Safety Design: 

① Customized external jackets are installed at the parts of the valve most prone to erosion, equipped with pressure sensors that immediately alarm if the pressure-bearing parts of the valve are damaged, ensuring safe operation of the equipment;

② A “fin-type” enhanced heat dissipation packing box is used, which ensures safe valve operation for personnel while effectively reducing heat transfer of the medium, preventing graphite packing from being damaged by high temperature;

③ The valve stem is designed with a dust-proof structure to prevent medium intrusion causing wear, jamming, or sticking. Additionally, an elastic loading structure is added at the packing area to ensure packing sealing and operational performance, extending service life;

▶ Operational Performance: The valve is equipped with a mounting platform for the drive device, allowing arbitrary replacement of various drive devices, improving convenience for customers to achieve remote control and automated operation.