Shanghai Xiazhao 1500LB 3L6 High-Performance Steam Safety Valve

Shanghai Xiazhao 1500LB 3L6 High-Performance Steam Safety Valve

Engineered for Maximum Discharge, Rapid Resealing, and Unmatched High-Temperature Reliability

● Design Standard: API 526
● Pressure Rating: 1500LB (ASME Class 1500)
● Size: 3" x 6" (Inlet x Outlet); other L-series available
● Max Temp: 450°C (842°F)
● Body Materials: ASTM A182 F91/F22/F316L (custom grades on request)
● Trim Material: Solid #7718 Alloy (seat & disc standard)
● Spring: Heat-treated high-temp alloy steel
● Connections: RF Flanges (ASME B16.5); buttweld ends available
● Quality: ISO 9001 Certified QMS

Shanghai Xiazhao 1500LB 3L6 High-Performance Steam Safety Valve

The 1500LB 3L6 steam safety valve from Shanghai Xiazhao delivers top-tier reliability for high-pressure steam overpressure protection. Engineered to API 526 standards, this full-lift, full-bore valve is tailored for mission-critical applications, safeguarding systems operating at up to 1500LB pressure and 450°C temperature. Its 6" outlet ensures maximum discharge capacity, enabling rapid pressure relief to protect personnel and equipment.

Core Design & Performance Advantages

● Maximum Capacity & Precision Operation
Full-Bore, Full-Lift Discharge: Optimized design boasts a high lift coefficient, maximizing flow through the 6" outlet. This enables fast, efficient overpressure venting, minimizing pressure spikes and restoring system safety quickly.
● Accurate Set Pressure & Blowdown: Precision-machined components and a calibrated spring system ensure consistent set pressure with minimal deviation. An adjustable blowdown ring allows optimal reseat settings, preventing simmering and ensuring tight sealing post-activation.
Rapid Reclosing & Superior High-Temperature Sealing
● Fast, Positive Reclosing: Proprietary guided disc design enables immediate, stable reseating once pressure normalizes. This reduces steam loss, enhances system stability, and boosts operational efficiency.
● Solid #7718 Alloy Seal Integrity: Seat and disc—critical sealing components—are made of solid #7718 cobalt-based hardfacing alloy. Unlike welded overlays, its monolithic structure avoids delamination/cracking risks. The alloy offers exceptional hot hardness, erosion, galling, and corrosion resistance at high temperatures, ensuring leak-tight performance and long service life under 450°C superheated steam.

Performance vs. Conventional Valves

Feature	Xiazhao 1500LB 3L6 Valve	Conventional Spring-Loaded Valve
Flow Capacity	Full-lift, high Kd for maximum flow	Partial-lift, limited capacity
Reseat Performance	Rapid reseat, minimal media loss	Slow reseat, prolonged leakage
High-Temp Sealing	Solid #7718 alloy, superior durability	Standard seats, fast thermal degradation
Thermal Stability	Heat-compensated spring, stable set pressure	Set pressure drift, spring relaxation
Construction	API 526-compliant, severe-service optimized	Generic design, unsuitable for extreme duty

Typical Applications

● Power Generation: Main steam lines, superheaters, turbines in fossil/biomass power plants
● Petrochemical: Ethylene crackers, hydrocracking reactors, steam reformers
● Industrial Processes: Large boilers, district heating, high-pressure steam loops
● Marine: Main/auxiliary boiler protection for vessels

Technical Specifications

Design Standard	API 526
Pressure Rating	1500LB (ASME Class 1500)
Size	3" x 6" (Inlet x Outlet); other L-series available
Max Temp	450°C (842°F)
Body Materials	ASTM A182 F91/F22/F316L (custom grades on request)
Trim Material	Solid #7718 Alloy (seat & disc standard)
Spring	Heat-treated high-temp alloy steel
Connections	RF Flanges (ASME B16.5); buttweld ends available
Quality	ISO 9001 Certified QMS

Why Choose Shanghai Xiazhao Valve?

We integrate rigorous engineering, premium materials (e.g., solid #7718 alloy trim), and precision manufacturing to deliver trustworthy safety valves. Backed by ISO 9001 certification, each 1500LB 3L6 valve reflects our commitment to quality. We offer expert technical support for selection, customization, and after-sales service.
Contact us for technical datasheets, quotations, or engineering consultations.
Shanghai Xiazhao Valve Co., Ltd. – Your Reliable Partner for Critical Pressure Protection.