Specification
GB API Standard Cast Steel Stainless Steel Slab Gate Valve
I. Product Overview
NEWWAY GB/API standard flanged slab gate valves are engineered for industrial fluid systems, constructed from cast steel (WCB/WCA) or stainless steel (304/316), compatible with GB/T 12234, API 6D, and other international/domestic standards. The valves achieve fluid shut-off via a slab gate lifting mechanism, with a straight-through flow path minimizing pressure loss, suitable for high-pressure applications involving oil, natural gas, water, and other media. Ranging from DN32 to DN800 (1-1/4″ to 32″) in nominal diameter and PN1.6 to 16.0MPa (Class150 to 400LB) in pressure rating, they meet rigorous demands in chemical, energy, municipal, and other sectors.
II. Core Technical Parameters
Specifications & Pressure Ratings
Nominal diameter: DN32-DN800 (1-1/4″-32″), supporting NPS 1″-32″ inch conversion
Pressure classes: PN1.6/2.5/4.0/6.4/10.0/16.0MPa (Class150/300/400)
Temperature range: -29°C to 425°C (low-temperature type down to -196°C, high-temperature up to 550°C)
Materials & Sealing System
Body/gate: Cast steel (WCB/WCC), stainless steel (CF8/CF8M), tensile strength ≥485MPa
Sealing pair: Metal hard seal (STL overlay) or soft seal (NBR/PTFE), leakage rate compliant with API 598
Stem: 2Cr13 stainless steel, chrome-plated surface (hardness ≥HRC35), corrosion-wear resistant
Connections & Actuation
Flange standards: ASME B16.5, GB/T 9113, HG/T 20592, etc., supporting multi-standard adaptation
Actuators: Manual (handwheel/gear), pneumatic, hydraulic, electric, with ISO 5211 mounting interface
Product Overview
III. Structural Design & Technical Features
Slab Gate Flow Optimization
Straight-through full-bore design, flow coefficient Cv 20% higher than conventional gate valves, ideal for pigging operations
Double-eccentric gate-seat structure, automatically compensating for wear during opening/closing, sealing specific pressure ≥15MPa
Multi-Standard Compatibility
Compliant with GB/T 12234 (China), API 6D (US), GOST 594 (Russia) design standards simultaneously
Flange dimensions compatible with ASME B16.5 and GB/T 9112 for easy international project replacement
IV. Manufacturing Processes & Quality Control
Precision Casting & Heat Treatment
Lost foam casting process, body blank dimension tolerance ≤±0.8mm, surface roughness Ra≤12.5μm
Cast steel parts normalized at 920°C + tempered at 650°C to eliminate internal stress, impact energy ≥34J (-20°C)
3D Quality Inspection
Ultrasonic testing (UT): 100% body inspection, conforming to GB/T 2970, defect evaluation grade ≥III
Pressure testing: Shell test at 1.5x working pressure (30min hold), sealing test at 1.1x pressure (zero leakage)
Spectral analysis: C, Cr, Ni element deviation ≤0.05% per heat to ensure material consistency
Surface Treatment Technology
Cast steel parts with zinc-rich epoxy primer (dry film thickness ≥80μm) + topcoat (RAL7035 industrial gray)
Stainless steel parts pickled and passivated, salt spray test ≥500 hours without corrosion
Valve Details
V. Core Product Advantages
Multi-Medium Adaptability
Oil & gas: H2S corrosion resistance (optional NACE MR0175 certified materials)
Chemical processes: Stainless steel compatible with acid/alkali media, seals resistant to strong corrosion (e.g., 316+VITON)
Municipal engineering: Wear-resistant coatings suitable for sewage, seawater, and other particulate-laden media
Long-Life Maintenance-Free Design
Stem packing with V-type composite seal (PTFE+graphite), service life ≥8 years
Replaceable seat design allows on-site maintenance without pipeline disassembly, reducing maintenance costs by 40%
Global Service Support
Certification system: ISO 9001, API 6D, CE-PED certified, registered for Russian GOST R
Delivery capability: 7-day delivery for standard products, 35 days for customized items, 100% on-time delivery rate
After-sales guarantee: 18-month warranty with online installation guidance and fault diagnosis