Slab Gate Valve

I. Product Features: Deep Integration of Technical Innovation and Structural Optimization

• Floating Seat & O-Ring Seal: The floating seat auto-compensates for sealing gaps via media pressure, paired with O-ring for bi-directional sealing. Opening/closing torque is only 1/2 of traditional valves, significantly reducing operational load.
• Flow-Through Bore & Full-Passage Design: Full-bore channel eliminates constriction when fully open, with flow resistance comparable to straight pipes, enabling pigging for particulate-laden media.
• Self-Sealing Bonnet & Auxiliary Sealing System: The bonnet’s self-sealing structure enhances reliability via media pressure; the stuffing box supports grease injection for zero leakage, solving traditional packing leakage issues.
• Hardfaced Sealing Surfaces: Stellite®6 alloy overlay (HRC48-52) on sealing surfaces ensures wear/corrosion resistance, suitable for high-temperature, high-pressure, and high-erosion environments.

II. Manufacturing Processes: Quality Assurance via Precision Casting and Advanced Treatments

1. Precision Casting Technology
   Investment casting (lost-wax process) ensures high-precision forming through 12 stages (wax pressing, shell making, roasting, casting), with dimensional tolerance controlled within ±0.1mm and surface roughness Ra≤3.2μm. Critical components (gate, seat) use premium cast steel (A216 WCB/WC6/WC9), optimized via solution treatment and tempering for anti-deformation capability.
2. Surface Treatment & Enhancement
   • Grinding & Sandblasting: 60-90 mesh emery removes burrs/scale for smooth surfaces.
   • Vibration Polishing & Pickling: Abrasive friction refines surfaces, followed by nitric-hydrofluoric acid pickling to form passivation films.
   • Nitriding & Overlay Welding: Stem ion nitriding boosts hardness to HV1000+; Stellite®6 overlay on seals uses high-frequency pulse welding (0.8-1.2mm penetration) to avoid thermal stress cracks.
3. Quality Inspection & Testing
   100% hydrostatic (1.5x pressure) and pneumatic (1.1x pressure) tests are conducted, with helium mass spectrometer leak detection meeting ISO 15848 standards. Key processes (welding, heat treatment) undergo ultrasonic and penetrant testing to eliminate internal defects.

III. Product Applications: Efficient Solutions Across Industries

• Oil & Gas Industry: Suitable for long-distance pipelines, wellheads, and LNG tanks (-46°C to 540°C, Class 150-Class 2500). Notably used in the Third West-East Gas Pipeline Project with zero-leakage performance.
• Chemical & Petrochemical Fields: Corrosion-resistant designs serve refineries and chemical plants, particularly in ethylene cracking units and hydrogenation reactors. A major petrochemical enterprise extended valve replacement cycles from 6 months to 2 years, cutting maintenance costs by 40%.
• Power & Energy Sector: Withstands high-temperature creep in boiler main steam pipelines, nuclear conventional islands, and biomass projects, compliant with ASME BPVC codes. Operated fault-free for 5 years in a 300MW coal-fired power plant under high-temperature/pressure conditions.
• Municipal & Environmental Engineering: Full-bore design facilitates pigging in wastewater treatment plants and water supply networks. A city wastewater plant achieved 30% higher pipeline maintenance efficiency with TIANYU valves.

IV. Advantages: Dual Breakthrough in Technical Leadership and User Value

1. Low Torque & Longevity
   Floating seat reduces torque, while Stellite®6 hardfacing enables ≥100,000 cycles—3-5x longer than traditional valves. Field data from an oilfield showed 60% extended life in frequent-operation scenarios.
2. Anti-Galling & High-Temperature Resistance
   Parallel gate design minimizes friction, paired with anti-seize coatings to prevent jamming from media crystallization or thermal expansion. Maintained stable sealing after 1,000 cycles at 500°C in high-temperature tests.
3. Intelligent & Maintenance-Friendly
   Optional electric/pneumatic actuators with position feedback support remote monitoring. Modular design allows on-site seal replacement without full disassembly, cutting maintenance time by 50%.
4. Certifications & Customization
   Holds API 6D, CE-PED, ISO 15848 certifications for global compliance. Offers fire-safe (API 607), anti-static, and special coatings (e.g., PTFE lining) per project needs.

V. Quality Commitment and Industry Reputation