The TIANYU Rising Stem Gate Valve is a full port industrial isolation valve strictly designed and verified in accordance with globally recognized industrial valve specifications covering API 600, ASME B16.34, ASME B16.5, ASME B16.10, as well as EU CE safety certification to fulfill global market access standards for North America, European Union, Middle East and Southeast Asia large-scale EPC industrial construction projects. Structurally categorized as rising stem parallel double disc gate valve, this product adopts full straight-through flow channel without internal flow blocking structure, focusing on complete pipeline cut-off and isolation functions instead of flow throttling service, which forms a clear functional differentiation with globe valves. This gate valve is configured with standard raised face flanged end connections, bolted bonnet assembly, flexible graphite braided stem packing and blue painted cast iron handwheel for pure manual on-site operation without matching electric or pneumatic actuators. All dimensional and performance parameters comply with unified international sizing and testing criteria to achieve full interchangeability with mainstream global standard pipeline flanges, significantly simplifying on-site installation, regular disassembly overhaul and spare parts replacement work for plant maintenance teams and international engineering contractors. Every finished valve undergoes full hydrostatic shell test and air tightness seat test under API 598 specification before factory delivery, passing third-party authoritative inspection to satisfy cross-border industrial procurement audit and tender bidding requirements.
The ASTM A217 WC6 Cr-Mo alloy steel valve body completes standardized tempering heat treatment after casting, possessing minimum tensile strength of 485MPa and minimum yield strength of 275MPa, with outstanding high-temperature creep resistance and structural stability under long-term high temperature and pressure alternating working environments. This alloy material is the core preferred raw material for high-temperature steam pipeline valves, effectively resisting thermal fatigue deformation and high-temperature oxidation damage that ordinary WCB carbon steel cannot withstand, and maintains stable mechanical performance under continuous service temperature close to 570°C. The internal double gate discs are integrally forged from solid SS316 stainless steel bar stock, undergoing multi-stage precision CNC machining and manual mirror lapping treatment on the sealing contact surface, forming rigid metal-to-metal sealing matching surfaces with WC6 valve body seat to realize bubble-tight shut-off under full Class 300LB differential pressure, free of aging, swelling or permanent deformation defects existing in polymer soft sealing materials under high-temperature medium erosion. The rising F12 Cr-Mo alloy steel stem receives quenching and tempering thermal processing to balance surface hardness and core material toughness, resisting medium corrosion and friction galling during long-period reciprocating lifting movement, effectively preventing stem jamming failure caused by rust and abrasion loss. The flexible graphite braided packing set forms multi-stage dynamic sealing around the stem, layered graphite fiber composite structure retains stable sealing performance under drastic temperature variation, effectively blocking fugitive medium leakage along the stem gap while allowing convenient packing compression adjustment without complete valve disassembly. Flanged raised face surfaces are machined with dense serrated anti-slip texture to increase gasket attaching friction force, preventing medium seepage under pipeline instantaneous pressure surges. The straight full-bore internal flow channel is optimized through precision casting design without convex structure blocking fluid circulation, so the medium pressure loss is controlled at an extremely low level when the valve is fully opened, which can effectively reduce the energy consumption of supporting pumps, compressors and other fluid transmission equipment in industrial piping systems.
