Cast Steel Hard Seal Fixed Ball Valve for Polysilicon Industry. Superior Hardness & Sealing: HRC78 body and HRC72 seat hardness ensure superior sealing in high-temp/pressure systems. Wide Pressure Range: Available in PN10-PN420 and Class 150-2500 for diverse industrial needs. Flexible Operation Modes: Supports Handwheel, Gear, Electric, and Pneumatic driving modes. Comprehensive Industry Applications: Ideal for Oil & Gas, Chemical, Power, Pharmaceutical, and Water Treatment sectors. Full Customization Options: Offers OEM, customization from samples/designs, and flexible minor customization. Strict Quality Inspection: 100% functional and visual inspection for all finished products. ISO Certified Manufacturer: Certified under ISO9001:2015, ISO45000:2018, and ISO14001 standards.