DJ41F American Standard Cryogenic Globe Valve Features
1. Strict API Standard Compliance: Design, materials, manufacturing, and testing fully comply with API 600, API 602 and other specifications, ensuring valve reliability and interchangeability under low-temperature conditions, meeting the requirements of international engineering projects.
2. Ultra-Low Temperature Materials and Cryogenic Treatment: Constructed from austenitic stainless steel or low-temperature steel, subjected to deep cryogenic treatment to eliminate residual austenite, effectively preventing brittle fracture at cryogenic temperatures and ensuring impact toughness and dimensional stability of materials at -196°C.
3. Anti-Freezing Extended Bonnet Design: The extended bonnet structure effectively lengthens the cold conduction path, keeping the stuffing box in a relatively higher temperature zone. This prevents packing freeze-up and valve stem seizure, ensuring flexible and reliable operation.
4. Cryogenic-Specific Sealing System: The disc and seat utilize low-temperature-specific soft sealing materials such as PTFE or PCTFE, or are overlaid with hard alloy. Featuring excellent sealing performance and low shrinkage rates at cryogenic temperatures, this ensures bidirectional zero-leakage sealing.
5. Fire-Safe and Safety Structure: Typically complies with API 607 fire-safe standards, forming a metal-to-metal secondary seal in case of soft seal failure. The stem features a blowout-proof design, and the packing uses low-temperature-specific materials, ensuring operational safety under extreme conditions.